Kimia Tingkatan 4 Melaka

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JABATAN PELAJARAN MELAKA BUKIT BARU, MELAKA

PEPERIKSAAN AKHIR TAHUN TINGKATAN 4 2011

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CHEMISTRY Kertas 1 Oktober 2011 Satu jam lima belas minit

1 ¼  jam

JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU

1. Kertas soalan ini mengandungi mengandungi  50 soalan. 2.  Jawab semua soalan. 3.  Jawab dengan dengan menghitamkan ruangan yang betul pada kertas kertas jawapan. 4.  Hitamkan satu ruangan sahaja bagi setiap soalan. 5.  Rajah tidak dilukis mengikut mengikut skala  kecuali dinyatakan 6. Anda dibenarkan dibenarkan menggunakan menggunakan kalkulator kalkulator saintifik yang yang tidak boleh boleh diprogramkan diprogramkan

Kertas soalan ini mengandungi 25 halaman bercetak 

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INFORMATION FOR CANDIDATES

1. This question paper consists of 50 questions.  Answer all questions. 2.  Answer all each question by blackening blackening the correct correct space on the answer sheet  sheet . 3.  Answer each

4.  Blacken only one space for each question. change your answer, answer, erase the blackened mark mark that you have have made. 5.  If you wish to change Then blacken the space for the new answer.

6. The diagrams in the questions provided are not drawn to scale unless stated . non-programmable scientific calculator. 7. You may use a non-programmable

MAKLUMAT UNTUK CALON

1. Kertas soalan ini mengandungi 50 soalan . 2.  Jawab semua soalan dengan menghitamkan ruangan ruangan yang betul pada kertas jawapan . 3.  Jawab dengan

4.  Hitamkan satu ruangan sahaja bagi setiap soalan . 5. Sekiranya anda hendak menukarkan jawapan, padamkan tanda yang telah dibuat. Kemudian hitamkan jawapaan yang baru. mengiringi soalan tidak dilukis dilukis mengikut skala skala kecuali dinyatakan. dinyatakan. 6.  Rajah yang mengiringi

7.  Anda dibenarkan dibenarkan menggunakan menggunakan kalkulator saintifik saintifik yang tidak boleh diprogramkan

Question 1 to Question 50 are followed by four options A, B, C or D. or D. Choose the best option for each question and blackened the corresponding space on the objective answer sheet.  Bagi Soalan 1 hingga Soalan 50, tiap-tiap soalan diikuti oleh empat pilihan jawapan A, B, C dan D. Pilih satu jawapan yang terbaik bagi tiap-tiap soalan dan hitamkan ruangan yang sepadan pada kertas jawapan objektif anda

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INFORMATION FOR CANDIDATES

1. This question paper consists of 50 questions.  Answer all questions. 2.  Answer all each question by blackening blackening the correct correct space on the answer sheet  sheet . 3.  Answer each

4.  Blacken only one space for each question. change your answer, answer, erase the blackened mark mark that you have have made. 5.  If you wish to change Then blacken the space for the new answer.

6. The diagrams in the questions provided are not drawn to scale unless stated . non-programmable scientific calculator. 7. You may use a non-programmable

MAKLUMAT UNTUK CALON

1. Kertas soalan ini mengandungi 50 soalan . 2.  Jawab semua soalan dengan menghitamkan ruangan ruangan yang betul pada kertas jawapan . 3.  Jawab dengan

4.  Hitamkan satu ruangan sahaja bagi setiap soalan . 5. Sekiranya anda hendak menukarkan jawapan, padamkan tanda yang telah dibuat. Kemudian hitamkan jawapaan yang baru. mengiringi soalan tidak dilukis dilukis mengikut skala skala kecuali dinyatakan. dinyatakan. 6.  Rajah yang mengiringi

7.  Anda dibenarkan dibenarkan menggunakan menggunakan kalkulator saintifik saintifik yang tidak boleh diprogramkan

Question 1 to Question 50 are followed by four options A, B, C or D. or D. Choose the best option for each question and blackened the corresponding space on the objective answer sheet.  Bagi Soalan 1 hingga Soalan 50, tiap-tiap soalan diikuti oleh empat pilihan jawapan A, B, C dan D. Pilih satu jawapan yang terbaik bagi tiap-tiap soalan dan hitamkan ruangan yang sepadan pada kertas jawapan objektif anda

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Which of the following statements best describes ‘Chemistry’?  Antara pernyataan pernyataan berikut, yang yang manakah terbaik terbaik menerangkan menerangkan ‘kimia’ ? A

Chemistry is the study gained through scientific investigations. Kimia ialah kajian diperoleh melalui penyiasatan saintifik.

B

Chemistry is a systemic s ystemic study of natural phenomena. Kimia ialah kajian sistemik bagi fenomena semulajadi.

C

Chemistry is the study of the composition, structure, properties and interactions of  matter. Kimia ialah kajian mengenai komposisi, struktur, sifat-sifat dan interaksi antara  jirim.

D

Chemistry is an art of transforming metals. Kimia ialah satu seni perubahan logam.

There are many industries involve chemistry include … Terdapat banyak industri melibatkan kimia termasuk … I

Petroleum industry  Industri petroleum

II

Nutritional industry  Industri pemakanan pemakanan

III

Mining industry  Industri perlombongan perlombongan

IV

Paint making industry  Industri membuat cat  cat 

A

I and II only  I dan II sahaja

B

I, II and III only  I, II dan III sahaja

C

I, II and IV only  I, II dan IV sahaja

D

I, II, III and IV  I, II, III dan IV 

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Which of the following is the best solution for an arteriosclerosis patient?  Antara berikut yang manakah penyelesaian terbaik bagi pesakit arteriosklerosis? take food rich in calcium makan makanan yang kaya dengan kalsium take food rich in iron makan makanan yang kaya dengan zat besi reduce fatty food intake kurangkan mengambil makanan berlemak  reduce sugary food intake kurangkan mengambil makanan bergula

A B C D

4

5

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Which of the following substance exists as atoms?  Antara bahan berikut, yang manakah wujud sebagai atom? A Emas Gold 

C Water  Air 

B Nitrogen  Nitrogen

D Chlorine Klorin

o

o

The melting point of a substance X is -2 C and its boiling point is 75 C. What is the o o physical state of substance X at -5 C and 85 C? Takat lebur bahan X ialah -2 oC dan takat didihnya ialah 75 oC. Apakah keadaan fizikal bahan X pada suhu -5 0C dan 850C? o

A B C D

At -5 C o Pada -5 C  Solid Pepejal Solid Pepejal Liquid Cecair  Gas Gas

o

At 85 C o Pada 85 C  Gas Gas Liquid Cecair  Gas Gas Solid Pepejal

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Diagram 1 below shows an atomic model.  Rajah 1 menunjukkan suatu model atom.

Diagram 1  Rajah 1 Which of the following is true about Diagram 1?  Antara penyataan berikut yang manakah  benar tentang Rajah 6?

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A

The atomic model above was proposed by Neils Bohr.  Model atom di atas dicadangkan oleh Neils Bohr.

B

The atom is a sphere of positive charge which contains a few electrons  Atom merupakan sfera bercas positif yang mengandungi sedikit elektron.

C

The electrons in an atom move in shells around the nucleus.  Elektron dalam atom bergerak dalam petala-petala yang mengelilingi nukleus.

D

The electrons move in a space that is larger than the space occupied by the nucleus.  Electron bergerak dalam ruang yang lebih besar daripada ruang yang ditempati oleh nukleus.

This isotope produces gamma radiation to kill cancer cells. What is the isotope?  Isotop ini menghasilkan sinar gamma untuk membunuh sel kanser. Apakah isotop ini? A

Iodine-131  Iodin-131

B

Cobalt-60 Kobalt-60

C

Sodium-24  Natrium-24

D

Carbon-12 Karbon-12

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Diagram 2 shows the symbol of fluorine atom.  Rajah 2 menunjukkan simbol bagi atom fluorin

19 F

9

Diagram 2  Rajah 2 Which of the following is true based on the symbol in Diagram 2.  Antara berikut yang manakah benar berdasarkan simbol dalam Rajah 2.

Proton number  Nombor proton 9 9 9 19

A B C D

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Nucleon number  Nombor nukleon 19 19 10 9

Number of electron  Bilangan elektron 9 19 9 9

Diagram 3 shows the electron arrangement of atom X.  Rajah 3 menunjukkan susunan elektron bagi atom X.

X

Diagram 3  Rajah 3 How many valence electrons are there in the atom of X?  Berapakah bilangan elektron valens yang terdapat dalam atom X? A

2

C 5

B

3

D 7

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Diagram 4 is a graph which shows the cooling curve for gas X.  Rajah 4 ialah satu graf yang menunjukkan lengkung penyejukan bagi gas X.

Diagram 4  Rajah 4

Which of the following statements is true?  Antara pernyataan yang berikut, manakah  benar? A B C D

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From point P to point Q, kinetic energy increases as temperature decreases.  Dari titik P ke titik Q, tenaga kinetik bertambah apabila suhu menurun. From point Q to point R, forces of attraction between particles become weak   Dari titik Q ke titik R, semua daya tarikan antara zarah-zarah menjadi lemah. At point R, all the gas X  has completely melted Pada titik R, semua gas X telah melebur keseluruhannya. From point R to point S , heat is released to the surroundings  Dari titik R ke titik S, haba dibebaskan ke persekitaran

The following equation represents the chemical process to extract aluminium from aluminium oxide. Persamaan dibawah menunjukkan proses kimia untuk mengekstrak aluminium dari aluminium oksida 2 Al2O3

→

4 Al + 3 O2

What is the volume of oxygen gas evolved when 204 g of aluminium oxide is used in the extraction ?  Berapakah isipadu gas oksigen yang terbebas apabila 204 g aluminium oksida digunakan di dalam proses ini? 3 [ Relative atomic mass ; O = 16 ; Al = 27, 1 mol of gas occupies 24.0 dm at room temperature ] 3 [Jisim atom relatif ; O = 16, Al = 27, 1 mol gas menempati 24.0 dm  pada suhu bilik.] A

36 dm

C 48 dm

B

144 dm

D 72 dm

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Diagram 5 shows the electron arrangement of a molecule of compound XY 2. ( Only the valence electrons are shown ).  Rajah 5 menunjukkan susunan elektron bagi molekul sebatian XY 2 (hanya elektronvalens yang ditunjukkan).

Diagram 5  Rajah 5

X and Y could be :  X dan Y mungkin : X

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Y

A

Carbon

Oxygen

B

Carbon

Chlorine

C

Carbon

Hydrogen

D

Chlorine

Carbon

Which of the following represents the electron arrangement of a noble gas?  Antara berikut, yang manakah mewakili susunan elektron gas adi? A

C

R

R

B

D

R

R

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Diagram 6 shows the set-up of the apparatus to determine the empirical formula of substance Y.

 Rajah 6 menunjukkan susunan radas untuk menentukan formula empirik bahan Y.

SubstanceY  Bahan Y  Hydrogen gas Gas hidrogen

Diagram 6

 Rajah 6 What could be substance Y ?

 Apakah mungkin bahan Y?

I

Copper(II) oxide

Kuprum(II) oksida

II

Magnesium oxide

 Magnesium oksida

III

Potassium oxide

Kalium oksida

IV A B C D

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Lead (II) oxide

Plumbum (II) oksida I and IV only  I and IV sahaja II and III only  II and III sahaja III and IV only  III and IV sahaja I, II, III and IV  I, II, III and IV 

Table 1 shows the mass of element P and Q which react with each other.  Jadual 1 menunjukkan jisim bagi unsur P dan Q yang bertindak balas. Element Unsur  Mass(g)  Jisim(g)

P

Q

0.32

0.36

Table 1  Jadual 1

What is the empirical formula for the substance formed?  Apakah formula empirik bagi sebatian yang terbentuk ? [Relative atomic mass :P = 64 ; Q = 35.5] [ Jisim atom relatif: P =64; Q = 35.5] C PQ4 PQ A B

PQ2

D P2Q3

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2.7 g of element X reacts with 2.4 g element Y to form a substance with empirical formula of X2Y3. What is the atomic mass of Y? 2.7 g unsur X bertindak balas dengan 2.4 g unsur Y untuk membentuk sebatian dengan  formula empirik X 2Y 3. Berapakah jisim atom relatif bagi Y? (Relative atomic mass : X = 27) ( Jisim atom relatif : X = 27) A

8

C 24

B

16

D 31

The chemical symbol of an element T is as shown : Simbol unsur T ditunjukkan seperti di bawah: 24

T 12 What would be the electron arrangement of the ion formed by an atom of T ?  Apakah susunan elektron bagi ion yang terbentuk oleh atom T?

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A

2.8

B

2.8.2

C

2.8.8

D

2.8.8.8

Which of the following elements are located in group 17 of the Periodic Table?  Manakah antara unsur-unsur berikut diletakkan di dalam kumpulan 17 Jadual Berkala? A

Neon and Argon  Neon dan Argon

B

Lithium and Potassium  Litium dan Kalium

C

Iodine and Bromine  Iodin dan Bromin

D

Nitrogen and Phosphorus  Nitrogen dan Fosforus

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The following statement is about the arrangement of the elements in the Periodic Table of  elements. Pernyataan berikut adalah mengenai susunan unsur di dalam Jadual Berkala Unsur .

“Elements are arranged in order of increasing proton number in The Periodic Table. Unsur-unsur disusun mengikut nombor proton menaik  dalam Jadual Berkala.” Which of the following scientist made the above statement?  Antara saintis berikut siapakah yang membuat pernyataan di atas ?

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A

Newlands

B

Meyer

C

Mendeleev

D

Dobereiner

Table 2 shows the proton number and number of electrons of several particles. Which of the following particles is an anion?  Jadual 2 menunjukkan nombor proton dan bilangan elektron bagi beberapa zarah.  Manakah di antara berikut merupakan anion? Particles  Zarah P Q R S

Proton Number  Nombor Proton 3 9 11 20

Number of electrons  Bilangan elektron 2 10 11 18

Table 2  Jadual 2 A

P

B

Q

C

R

D

S

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Table 3 shows the elements in Period 3 of the Periodic Table of elements. The elements can react with oxygen to form oxides.  Jadual 3 menunjukkan unsur-unsur Kala 3 dalam Jadual Berkala Unsur. Unsur-unsur  tersebut bertindak balas dengan oksigen membentuk oksida. Element Unsur 

Na

Mg

Al

Si

P

S

Cl

Table 3  Jadual 3 Which of the following element forms amphoteric oxide?  Antara berikut unsur manakah membentuk oksida amfoterik?

22

23

A

S

C

Si

B

P

D

Al +

The number of neutrons of atom X is 20. If the number of electrons of ion X is 18, what is the relative atomic mass of X? 2+  Bilangan neutron bagi suatu atom X ialah 20. Jika bilangan elektron ion X  ialah 18, berapakah jisim atom relatif X? A

18

C

38

B

20

D

40

Which of the following is true about elements in the Periodic Table?  Antara berikut yang manakah benar tentang unsur-unsur dalam Jadual Berkala? A

The metallic properties increases from left to right across a period Sifat kelogaman bertambah apabila merentasi Jadual Berkala dari kiri ke kanan

B

Elements of the same group have the same physical properties Unsur dalam kumpulan yang sama mempunyai sifat fizik yang sama

C

Group 18 elements have low melting and boiling points Unsur kumpulan 18 mempunyai takat lebur dan takat didih yang rendah

D

Group 17 elements exist naturally as monoatoms Unsur kumpulan 17 wujud semulajadi sebagai monoatom

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What happens to a sodium atom when chlorine combines with sodium?  Apakah yang berlaku kepada atom natrium apabila klorin berpadu dengan natrium? A

Accepts an electron  Menerima satu elektron

B

Donates an electron  Menderma satu elektron

C

Accepts two electrons  Menerima dua elektron

D

Shares a pair of electrons  Berkongsi sepasang elektron

Sodium and sulphur have the proton number 11 and 16 respectively. They react to form sodium sulphide. Which of the following statements are true?  Natrium dan sulfur masing-masing mempunyai nombor proton 11 dan 16. Mereka bertindakbalas membentuk natrium sulfida. Antara pernyataan berikut, yang mana adalah benar? I

A sodium atom donates an electron to form a sodium ion Satu atom natrium menderma satu elektron untuk membentuk ion natrium

II

A sodium atom donates two electrons to the sulphur atom Satu atom natrium menderma dua elektron kepada atom sulfur 

III

A sulphur atom receives two electrons to form a sulphide ion Satu atom sulfur akan menerima dua elektron untuk membentuk ion sulfida

IV

Sodium and sulphur combine to form an ionic compound  Natrium dan sulfur bergabung untuk membentuk sebatian ion.

A

I and IV only  I dan IV sahaja

B

I, II and III only  I, II dan III sahaja

C

I, III and IV only  I, III dan IV sahaja

D

II, III and IV only  II, III dan IV sahaja

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Table 4 shows the electron arrangement of atoms G, H, J and K  Jadual 4 menunjukkan susunan elektron bagi atom G,H, J dan K  Atom

G

H

J

K

Electron arrangement Susunan elektron

1

2.5

2.8.2

2.8.8.1

Table 4  Jadual 4

Which of the following pairs of elements can combine to form a covalent compound? Yang manakah antara pasangan unsur-unsur berikut boleh membentuk sebatian kovalen?

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A

G and H

B

H and J

C

G and K

D

H and K

Which of the following set of apparatus is the most suitable to be used in electrolysis of  copper(II) sulphate solution?  Antara susunan radas yang berikut, yang manakah  paling sesuai digunakan dalam proses elektrolisis larutan kuprum (II) sulfat ?

A

Carbon rod  Rod karbon

B

Copper(II) sulphate solution  Larutan ku rum(II) sul at  C

D Carbon rod  Rod karbon Copper(II) sulphate solution  Larutan ku rum(II) sul at 

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Table 5 contains information on the melting points and boiling points of substances P, Q, R and S.  Jadual 5 mengandungi maklumat tentang takat lebur dan takat didih bagi bahan-bahan P,Q,R dan S 

Substance  Bahan

Melting point (ºC) Takat lebur (ºC)

Boiling point (ºC) Takat didih (ºC)

Electrical conductivity in molten state

P

-30

174

Cannot conduct

Q

43

182

Cannot conduct

R

119

444

Can conduct

S

688

1100

Can conduct

Table 5 Jadual 5 Which of the following classifications of substances P, Q, R and S is correct?  Antara pengkelasan berikut, yang manakah benar bagi bahan P, Q, R dan S? Ionic compound Sebatian ion

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Covalent compound Sebatian kovalen

A

P and Q

R and S

B

R and S

P and Q

C

P, Q and R

S

D

S

P

What is the percentage of nitrogen by mass in ammonium nitrate, NH 4NO3?  Apakah peratus nitrogen dalam ammonium nitrat  NH 4 NO3 mengikut jisim? [ Relative atomic mass: H = 1, N = 14 ,O = 16] [ Jisim atom relatif : H = 1, N = 14, O = 16] A

17.50 %

B

21.21 %

C

35.00 %

D

53.85 %

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Aqueous sodium chloride solution is an electrolyte because it has  Larutan natrium klorida berair ialah sejenis elektrolit kerana ia mempunyai A

Free moving ions  Ion yang bebas bergerak 

B

Free moving electrons  Elektron yang bebas bergerak 

C

Free moving atom  Atom yang bebas bergerak 

D

Free moving molecules  Molekul yang bebas bergerak 

Diagram 7 shows a chemical cell.  Rajah 7 menunjukkan sebuah sel kimia.

V

X plate

Y plate

Plat X 

Plat Y 

Electrolyte Elektrolit 

Diagram 6 Diagram 7  Rajah 7  Which of the following is true?  Di antara berikut, yang manakah adalah benar? Metal X/Y Negative Terminal  Logam X/Y  Terminal negatif  A

Iron/Zinc Ferum/Zink 

Iron Ferum

B

Iron/Aluminium Ferum/Aluminium

Iron Ferum

C

Zinc/Copper  Zink/Kuprum

Zinc  Zink 

D

Magnesium/Aluminium  Magnesium/Aluminium

Aluminium  Aluminium

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Diagram 8 shows the set–up of apparatus of a chemical cell. Which of the following are not true of a chemical cell?  Rajah 8 menunjukkan susunan radas suatu sel kimia.  Antara berikut yang manakah tidak benar mengenai sel kimia? V

Electrodes  Elektrod  Liquid H Cecair H  Diagram 8 Rajah 8

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I

The electrodes are of the same metal.  Elektrod-elektrod adalah logam yang sama .

II

The electrodes are of different metals  Elektrod-elektrod adalah logam yang berlainan.

III

Liquid H is an electrolyte. Cecair H ialah sejenis elektrolit .

IV

Electrical energy change to chemical energy Tenaga elektrik bertukar kepada tenaga kimia

A

I and III only

B

I and IV only

C

II and IV only

D

I, III and IV only

Which of the following substances is acidic?  Antara bahan berikut yang manakah bersifat asid? A B C D

Ammonia  Ammonia Potassium oxide Kalium oksida Carbon dioxide Karbon dioksida Sodium hydroxide  Natrium hidroksida

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It is discovered that a compound with formula AB dissolves in water. What inference can you make about the compound ?  Didapati satu sebatian dengan formula AB larut dalam air. Apakah inferens yang boleh dibuat tentang sebatian itu? A

It is a covalent compound  Merupakan sebatian kovalen

B

The compound ionizes in water Sebatian mengion dalam air 

C

The compound will dissolve in an organic solvent Sebatian yang larut dalam pelarut organik 

D

The intermolecular forces between the particles are very weak   Daya antara molekul pada zarah-zarah adalah sangat lemah

During the electroplating of an iron key with copper, which of the following should be done? Semasa menyadurkan kunci besi dengan kuprum, yang manakah antara berikut perlu dilakukan? I

The iron key should be made the cathode Kunci besi perlu dijadikan katod 

II

Molten copper is used as the electrolyte Kuprum lebur dijadikan elektolit 

III

An aqueous solution of copper (II) sulphate is made the electrolyte  Larutan berair kuprum (II) sulfat dijadikan elektrolit 

IV

Two copper plates should be used as electrodes  Dua kepingan kuprum digunakan sebagai elektrod 

A

I and III only

B

II and IV only

C

I, II and IV only

D

I, III and IV only

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Diagram 9 shows the set-up of the apparatus of an electrolytic cell.  Rajah 9 menunjukkan susunan radas bagi satu sel elektrolisis.

Diagram 9  Rajah 9 Which of the following half-equations represents the reaction that occurred at electrode Q?  Antara persamaan setengah berikut, yang manakah mewakili tindak balas yang berlaku di elektrod  Q?

37

+

-

A

Na + e

B

2H

C

2Cl

D

4OH

+

-

-

→

-

+

2e

→

Cl2

→

Na

→

H2

+

2e

-

O2 + 2H2O +

4e

-

Which of the following equations does not involve neutralisation?  Antara persamaan kimia berikut yang manakah  tidak melibatkan peneutralan? A

2HCl (aq) + MgO(s)

B

H2SO4(aq) + BaCl 2(aq)

C

HNO3(aq) + NaHCO3(s)

D

HCl(aq) + NH3(aq)

MgCl2(aq) + H2O(l) BaSO4(s) + 2HCl(aq) NaNO3(aq) + CO2(g) + H2O(l) NH4Cl(aq)

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20

Diagram 10 below shows the set-up of apparatus for electrolysis.  Rajah 10 di bawah menunjukkan susunan radas untuk elektrolisis.

Substance bahan Diagram 10  Rajah 10 Which of the following substance could light up the bulb?  Antara bahan berikut, yang manakah boleh menyalakan mentol? A B C D

39

Potassium chloride solution  Larutan kalium klorida Glucose solution  Larutan glukosa Magnesium oxide  Magnesium oksida Tetrachloromethane solution  Larutan tetraklorometana

Table 6 shows the degree of dissociation of four solutions of alkalis which have the same concentration.  Jadual 6 di bawah menunjukkan darjah penceraian empat larutan alkali yang sama kepekatan. Solution  Larutan W

Degree of dissociation  Darjah penceraian Low  Rendah X Medium Sederhana Y High Tinggi Z Very high Sangat tinggi Table 6  Jadual 6  Which solution has the highest pH value?  Larutan yang manakah mempunyai nilai pH yang paling tinggi? W A C Y B

X

D

Z

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21

Diagram 11 shows two electrolytic cells which use two different type of electrodes, cell A uses carbon electrode while cell B uses copper electrode.  Rajah 11 menunjukkan dua sel elektolisis yang mana menggunakan dua jenis elektrod yang berlainan. Sel A mengunakan elektrod karbon manakala sel B mengunakan elektrod  kuprum.

Carbon Electrode  Elektod  karbon

Copper Electrode  Elektrod  kuprum

Copper(II) sulphate solution  Larutan kuprum (II) sulfat 

Ce Cell A

Cell B

Diagram 11  Rajah 11 What are the half equation that represented the reaction at anode for both cells?  Apakah setengah persamaan yang mewakili tindak balas di anod pada kedua-dua sel?

Cell A Sel A

41

-

2H2O + O2 + 4e

-

2H2O + O2 + 4e

A

4OH

B

4OH

C

Cu

D

Cu

+

Cell B Sel B

→

→

-

+ 2e

→

Cu

→

+

-

Cu

-

Cu

Cu

+

→

4OH -

+ 2e

-

+ 2e Cu

→

+

Cu -

+ 2e

-

2H2O + O2 + 4e

-

2H2O + O2 + 4e

→

4OH

→

-

-

What is the mass of sodium hydroxide, NaOH which is required to prepare 250 cm sodium -3 hydroxide solutions with a concentration of 100 gdm ? [Relative atomic mass: Na = 23; O = 16; H = 1] 3  Berapakah jisim natrium hidroksida, NaOH yang diperlukan untuk menyediakan 250 cm -3 larutan natrium hidroksida dengan kepekatan 100 gdm ? [ Jisim atom relatif Na = 23; O = 16; H = 1] A

25g

C

20g

B

35g

D

40g

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43

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22 -

50.0 cm of 0.4 moldm potassium hydroxide solution, KOH is titrated with sulphuric acid, -3 H2SO4. What is the volume of 1.0 moldm sulphuric acid which is needed to neutralise this potassium hydroxide solution? 3 -3 50.0 cm larutan kalium hidroksida, KOH 0.4 moldm dititratkan dengan asid sulfurik, -3  H 2SO4. Berapakah isipadu asid sulfurik 1.0 moldm yang diperlukan untuk meneutralkan larutan kalium hidroksida ini? A

10.0 cm

C

40.0 cm

B

20.0 cm

D

50.0 cm

Which of the statements are true about a weak alkali?  Antara pernyataan berikut, yang manakah benar tentang alkali lemah? I

It dissociates partially into hydroxide ions in water  Ia terurai separa kepada ion hidroksida di dalam air 

II

Its pH value is higher than that of sodium hydroxide  Nilai pH nya adalah lebih tinggi daripada nilai pH natrium hidroksida

III

It has low OH ion concentration  Ia mempunyai kepekatan ion hidroksida yang rendah

IV

Most of its molecules remain unchanged in the water Kebanyakan molekulnya kekal tidak berubah di dalam air 

A

I and II only

B

I, II and III only

C

I, III and IV only

D

II, III and IV only

-

-

-

The formula for a sulphate ion is SO 4 and for a nitrate ion is NO3 . If the formula of the sulphate salt of M is MSO4, what is the formula of nitrate salt of M? 2Formula bagi sulfat ion adalah SO 4 dan bagi nitrat ion adalah NO 3 . Jika formula bagi garam M sulfat adalah MSO 4 , apakah formula bagi garam M nitrat? A

MNO3

B

M2NO3

C

M(NO3)2

D

M(NO3)3

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The following is chemical equation for a reaction.  Berikut ialah persamaan kimia bagi satu tindak balas. CaCO3 + 2HNO3

Ca(NO3)2 + H2O + CO2

Which of the following are the products?  Antara berikut, yang manakah hasil tindak balas?

46

A

H2O and CO2

B

HNO3 and CO2

C

CaCO3 and HNO3

D

Ca(NO3)2, H2O and CO2

Which of the following salts can be prepared by using double decomposition method? Yang manakah di antara garam-garam berikut boleh disediakan dengan menggunakan kaedah penguraian ganda dua? I

A

Zinc chloride  Zink klorida Barium sulphate  Barium sulfat  Sodium nitrate  Natrium nitrat  Magnesium carbonate  Magnesium karbonat  I and III only

B

II and IV only

C

I, II and III only

D

II, III and IV only

II III IV

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-

Excess magnesium oxide is reacted with 25.0 cm of 2.0 moldm nitric acid. Calculate the maximum mass of magnesium nitrate salt formed. [Relative atomic mass: N=14, 0=16, Mg=24] 3  Magnesium oksida berlebihan bertindak balas dengan 25.0 cm asid nitrik berkepekatan -3 2.0 moldm . Kira jisim bagi garam magnesium nitrat yang terbentuk. [Jisim atom relatif : N=14, 0=16, Mg=24] A

7.40 g

C 3.70 g

B

4.30 g

D

1.48 g

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When heated, solid S gives off a gas that turns lime water milky. What is solid S?  Apabila dipanaskan, pepejal S membebaskan gas yang menukarkan air kapur menjadi keruh. Apakah pepejal S? I II III IV

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Sodium carbonate  Natrium karbonat  Calcium carbonate Kalsium karbonat  Potassium carbonate Kalium karbonat  Magnesium carbonate  Magnesium karbonat 

A

II only

B

II and IV only

C

I and IV only

D

II, III and IV only

The equation shows a reaction between silver nitrate solution and sodium chloride solution. Persamaan di bawah menunjukkan tindak balas di antara larutan argentum nitrat dan larutan natrium klorida

AgNO3 (aq) + NaCl(aq)

→

NaNO3 (aq) + AgCl(s)

Calculate the mass of silver chloride formed when 0.1 mol of silver nirate solution is added to 0.1 mol of sodium chloride solution?  Hitungkan jisim argentum klorida yang terbentuk apabila 0.1 mol larutan argentum nitrat  di tambah ke dalam 0.1 mol larutan natrium klorida? [ Relative atomic mass : Cl = 35.5; Ag = 108] [ Jisim atom relatif : C =,35.5; Ag =108] A

28.70 g

B

43.05g

C

21.50 g

D

14.35g

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Which of the following catalyst is used in the Haber process? Yang manakah di antara mangkin berikut digunakan dalam proses Haber ? A B C D

Platinum Platinum Nickel Nikel Iron Besi Vanadium (V) oxide Vanadium (V) oksida

END OF QUESTION PAPER  KERTAS SOALAN TAMAT 

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Nama Kelas JABATAN PELAJARAN MELAKA BUKIT BARU, MELAKA

PEPERIKSAAN AKHIR TAHUN TINGKATAN 4 2011

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CHEMISTRY Kertas 2 Oktober 2011 2 ½ jam

Dua jam tiga puluh minit

JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU 1. Kertas soalan ini mengandungi tiga bahagian:  Bahagian A, Bahagian B and Bahagian C. 2.  Jawab  semua soalan dalam Bahagian A. Tulis  jawapan dalam  Bahagian A dalam ruangan  yang disediakan.. 3.  Jawab satu soalan dalam  Bahagian B dan satu soalan dalan  Bahagian C.  Jawab soalan dalam  Bahagian B dan  Bahagian C  dengan terperinci. Anda boleh menggunakan  persamaan kimia, rajah, jadual, graf dan kaedah yang bersesuaian untuk menerangkan  jawapan anda. 4. Tunjukkan jalan kerja. Ia dapat membantu anda mendapat markah. 5.  Rajah dalam soalan tidak dilukis mengikut  skala. 6.  Markah yang diperuntukan bagi setiap soalan ditunjukkan dalam kurungan. 7.  Anda boleh menggunakan kalkulator saintifik   yang tidak diprogramkan. 8. Serahkan kertas jawapan pada akhir waktu  peperiksaan.

Untuk kegunaan pemeriksa Bahagian No. Markah 1 2 3 A 4 5 6 Jumlah 7 B 8

C

9 10 Jumlah

Jumlah Markah

Kertas soalan ini mengandungi 17 halaman bercetak  [Lihat sebelah

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2 Section A [60 marks] Answer all questions  Jawab semua soalan

1

Table 1 shows the proton number and nucleon number for atoms P, Q , R and S.  Jadual 1 menunjukkan nombor proton dan nombor nukleon bagi atom P, Q, R dan S. Atom

Proton number

Nucleon Number

P

16

32

Q

17

35

 R

17

37

S 

18

40 Table 1  Jadual 1

(a)

(i)

What is meant by proton number?  Apakah yang dimaksudkan dengan nombor proton ? ...............................................................................……………................…................ [ 1 mark ]

(ii)

What is the number of neutrons in atom P?  Apakah bilangan neutron dalam atom P? .................................................................................................………………….....…. [ 1 mark ]

(b)

(i)

Which atoms are isotopes? Explain your answer.  Atom-atom yang manakah adalah isotop? Terangkan jawapan anda. ....................................................................................................................................... .......................................................................................................................................

(ii)

A Z

[ 2 marks ]

Write the isotopes in the form of X.  A Tuliskan isotop-isotop dalam bentuk  Z  X. ....................................................................................................................................... [ 2 marks ]

(c)

(i)

Write the electron arrangement for atom R. Tuliskan susunan elektron bagi atom R. ...................................................................................................................................... [ 1 mark ]

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(ii)

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Draw the electron arrangement of atom R.  Lukiskan susunan elektron bagi atom R.

[ 2 marks ] (d)

S is an inert gas which chemically unreactive S merupakan gas lengai yang tidak reaktif secara kimia

Explain the above statement. Terangkan kenyataan di atas. ................................................................................................................................................ [ 1 mark ] 2

Diagram 2 shows the apparatus set-up used in an experiment to determine the empirical formula for an oxide of lead.  Rajah 2 menunjukkan susunan radas yang digunakan dalam eksperimen bagi menentukan  formula empirik bagi oksida plumbum. oxide of lead oksida plumbum dry hydrogen hidrogen kering

Diagram 2  Rajah 2

The following data was obtained based on the experiment :  Data berikut diperolehi berdasarkan suatu ekperimen: Mass of an oxide of lead  Jisim oksida plumbum Mass of lead  Jisim plumbum

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= 4.78 g = 4.14 g

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(a)

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What is meant by empirical formula ?  Apakah yang dimaksudkan dengan formula empirik ? ………………………….……………………………………………………….................... ……………………………………………………………………………………………..... [ 1 mark ]

(b)

Name one substance that can be used to dry the hydrogen gas.  Namakan bahan yang boleh digunakan untuk mengeringkan gas hidrogen. .................................................................................................................................................

[ 1 mark] (c) Why does the hydrogen gas need to be passed through the combustion tube for a few minutes before heating ?  Mengapakah gas hidrogen dialirkan ke dalam tiub pembakaran beberapa minit sebelum  pemanasan ? ................................................................................................................................................. ................................................................................................................................................. [ 1 mark] (d)

How to ensure the reaction is complete ?  Bagaimana untuk memastikan tindak balas adalah lengkap? ................................................................................................................................................. ................................................................................................................................................. [ 2 marks]

(e)

Determine the empirical formula for oxide of lead ? Tentukan formula empirik bagi oksida plumbum ? [Relative atomic mass for O = 16 and Pb = 207] [Jisim atom relatif bagi O = 16 dan Pb = 207]

[ 4 marks]

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(f)

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5

Why does the empirical formula of magnesium oxide cannot be determined using the above method ?  Mengapa formula empirik magnesium oksida tidak boleh ditentukan menggunakan kaedah di atas ? ................................................................................................................................................. [ 1 mark]

3

Diagram 3 shows the positions of 6 elements represented by the letters A, B, C, D, E, F in the Periodic Table of Elements.  Rajah 3 menunjukkan kedudukan 6 unsur yang diwakili oleh huruf A,B,C,D,E, F dalam Jadual  Berkala Unsur.

A

B

C

D

E

F Diagram 3  Rajah 3 Using these letters, answer the following questions.  Menggunakan huruf-huruf tersebut, jawab soalan-soalan berikut. (a) State the element which exists as a diatomic molecule under room condition.  Nyatakan unsur yang wujud sebagai molekul dwiatom pada keadaan bilik. ………………………………………………………………………………………………. [ 1 mark ] (b)

State one special characteristic of element F .  Nyatakan satu ciri istimewa bagi unsur F. ……………………………………………………………………………………………..... [ 1 mark ]

(c)

(i)

Arrange atoms A, B, C, D and E in decreasing order of atomic size. Susun atom A, B ,C , D dan E mengikut tertib pengurangan saiz atom. ………………………………………………………………………………………... [ 1 mark ]

(ii)

Explain your answer in (c)(i).  Huraikan jawapan anda dalam (c)(i). …………………………………………………………………………………….….. ………………………………………………………………………………………... [ 3 marks ]

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(d)

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6

Write the chemical formula for the ion formed by element D. Tuliskan formula kimia bagi ion yang terbentuk dari unsur D. …………………………………………………………………………………………......... [ 1 mark ]

(e)

Write the chemical equation for the reaction between the oxide of A and water. Tuliskan persamaan kimia untuk tindakbalas antara oksida A dan air. …………………………………………………………………………..…………………... [ 3 marks]

4

Table 4 below shows the electron arrangement of 6 elements T,U,V,W, X and Y.  Jadual 4 menunjukkan susunan elektron bagi unsur-unsur T,U,V,W, X dan Y  Elements

Proton number

Electron arrangement

T U V W X Y

6 17 11 12

2.4 2.8.7 2.8.1 2.8.2 2.8.8

19 Table 4 Jadual 4

(a)

Based on Table 4, answer the following questions.  Berdasarkan Jadual 4, jawab soalan-soalan berikut. (i) What is the proton number of element X ?  Berapakan nombor proton bagi unsur X? ...................................................................................................................................... [ 1 mark ] (ii)

What is the electron arrangement for ion Y?  Apakah susunan elektron bagi ion Y? ............................................................................................................………………... [ 1 mark ]

(b)

Element T reacts with element U to form a compound Unsur T bertindakbalas dengan unsur U untuk membentuk satu sebatian (i) Give the molecular formula of compound formed.  Berikan formula molekul bagi sebatian yang terbentuk. ....................................................................................................................................... [ 1 mark ]

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7 (ii)

State the type of bonding in the compound formed in (b)(i).  Nyatakan jenis ikatan yang terbentuk bagi sebatian yang terbentuk dalam (b)(i). ………………………………………………………………………………………... [ 1 mark ]

(iii)

Give two physical properties of the compound formed.  Berikan dua sifat fizikal sebatian yang terbentuk. ………………………………………………………………………………………... ………………………………………………………………………………………... [ 2 marks ]

(iv)

(c)

Illustrate the electron arrangement of the compound formed in (b)(i)  Lukis susunan elektron bagi sebatian yang terbentuk dalam (b)(i)

[ 2 marks ] Element W reacts with element U to form a compound. Write the chemical formula of the compound formed by U and W. Unsur W bertindakbalas dengan unsur U membentuk satu sebatian. Tuliskan formula kimia bagi sebatian yang terbentuk oleh U dan W. ………………………………………………………………………………………............. [ 1 mark ]

(d)

State an element that can form a cation.  Nyatakan satu unsur yang boleh membentuk kation. ………………………………………………………………………………………... [ 1 mark ]

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Table 5.1 shows incomplete observation for two sets of electrolysis of sodium chloride solution with different concentration using carbon electrode.  Jadual 5.1 menunjukkan pemerhatian yang tidak lengkap bagi dua set elektrolisis larutan natrium klorida dengan kepekatan yang berbeza menggunakan elektrod karbon .

Set

Set 1

Set 2

Concentration of  sodium chloride solution -3 (mol dm ) Kepekatan larutan natrium klorida -3 (mol dm )

Observation Pemerhatian

Anode

Bubbles of colourless gas is released Gas tanpa warna dibebaskan

Cathode

Bubbles of colourless gas is released Gas tanpa warna dibebaskan

0.002

Anode

........................................................................

Cathode

........................................................................

1.0

Table 5.1  Jadual 5.1 (a)

(i)

Complete Table 5.1  Lengkapkan Jadual 5.1 [ 2 marks ]

(ii)

Describe a chemical test to identify the product formed at anode in set 2.  Huraikan satu ujian kimia untuk mengenalpasti hasil yang terbentuk di anod pada set 2. ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... [ 2 marks ]

(b)

Based on experiment in set 1:  Berdasarkan eksperimen dalam set 1: (i) Name the colourless gas formed at the cathode.  Namakan gas tanpa warna yang terbentuk di katod. ....................................................................................................................................... [ 1 mark ]

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9 (ii)

Write a half equation for the formation of gas gas at the cathode. cathode. Tulis setengah persamaan untuk pembentukan gas di katod. ........................................... .................................................................. .............................................. .............................................. .............................................. .......................

[ 1 mark ] (c) In another another experiment, experiment, a student using apparatus and materials materials in Table 5.2 to produce an electrical energy from chemical energy.  Dalam satu eksperimen lain, seorang pelajar menggunakan menggunakan radas dan bahan dalam  Jadual 5.2 untuk untuk menghasilkan tenaga tenaga elektrik dari tenaga kimia. Apparatus  Radas Materials  Bahan

(i)

Beaker, connecting wire, galvanometer  Bikar, wayar penyambung, galvanometer  galvanometer  Zinc , copper strip, copper (II) sulphate solution  Zink, kepingan kepingan kuprum, larutan kuprum (II) sulfat  Table 5.2  Jadual 5.2 Diagram below shows incomplete apparatus set-up used in (c).  Rajah di bawah menunjukkan susunan radas tidak lengkap yang digunakan pada (c). Complete the diagram below.  Lengkapkan  Lengkapkan rajah di bawah.

[ 2 marks ] (ii)

State the direction of electron flow in this experiment.  Nyatakan arah arah pergerakan pergerakan elektron dalam eksperimen ini. ............................................ ................................................................... .............................................. .............................................. .............................................. ............................... ........ [ 1 mark ]

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(iii)

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10

State the observation in the copper (II) sulphate solution.  Nyatakan pemerhatian pemerhatian pada larutan larutan kuprum(II) kuprum(II) sulfat . ............................................ ................................................................... .............................................. .............................................. .............................................. ............................... ........ [ 1 mark ]

6

-

An experiment is carried carried out to find the end point of acid-base titration. 25.0 25.0 cm of 1.0 moldm sodium hydroxide hydroxide solution reacts reacts with hydrochloric acid. Table 6 shows shows the results of the experiment. Satu eksperimen dijalankan untuk menentukan takat akhir peneutralan antara asid dan alkali. 3 -3 25.0 cm bagi 1.0 moldm larutan natrium hidroksida bertindak balas dengan asid hidroklorik.  Jadual 6 menunjukkan menunjukkan keputusan bagi eksperimen eksperimen tersebut. tersebut.

Volume of hydrochloric acid

First reading

Final burette reading/ cm Initial burette reading/ cm Volume of hydrochloric acid used/ cm

21.00 0.00

Second reading 41.60 21.00

Third reading 25.80 5.00

Table 6  Jadual 6 

(a)

Draw the set-up of apparatus apparatus that is used in the experiment.  Lukiskan gambar gambar rajah susunan susunan alat radas yang yang digunakan di di dalam eksperimen eksperimen ini.

[ 2 marks ] (b)

(i)

State the indicator solution that is suitable to be used in the experiment.  Nyatakan larutan penunjuk yang yang sesuai untuk digunakan di dalam eksperimen ini. ………………………………………………………………………………………... [ 1 mark ]

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(ii)

Based on the indicator solution mentioned in (b)(i), state state the colour change change at the end point.  Berdasarkan  Berdasarkan larutan penunjuk yang dinyatakan di dalam (b)(i), nyatakan  perubahan warna pada takat takat akhir. ………………………………………………………………………………………... [ 1 mark ]

(c)

(i)

Complete Table 6 to find the volume of hydrochloric acid used.  Lengkapkan  Lengkapkan Jadual 6 untuk menentukan menentukan isipadu isipadu asid yang digunakan. digunakan. [ 1 mark ]

(ii)

Calculate the average volume of hydrochloric acid used. Kira isipadu purata bagi asid hidroklorik yang digunakan.

[ 1 mark ] (d)

Write the chemical equation for this experiment. Tulis persamaan kimia bagi eksperimen ini. ………………………………………………………………………………………………. [ 1 mark ]

(e)

Find the concentration of hydrochloric acid used. Tentukan kepekatan bagi asid hidroklorik yang digunakan.

[ 2 marks ] (f) Hydrochloric acid is classified as a strong and monoprotic acid. State another example of  monoprotic acid.  Asid hidroklorik dikelaskan dikelaskan sebagai sebagai asid kuat dan asid monoprotik. monoprotik. Nyatakan contoh asid  monoprotik yang lain. ………………………………………………………………………………………....……. [ 1 mark ]

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Section B [20 marks] Answer any one question from this section  Jawab mana-mana satu soalan dari bahagian ini

7

(a)

Diagram 7 shows the electron arrangement of a molecule PQ 2.  Rajah 7 menunjukkan susunan elektron bagi satu molekul PQ2.

Diagram 7  Rajah 7  Based on Diagram 7, write the electron arrangement for atoms of element P and element Q. Explain the position of element Q in the Periodic Table.  Berdasarkan Rajah 7, tulis susunan elektron bagi atom unsur P dan unsur Q. Terangkan kedudukan unsur Q dalam Jadual Berkala [6 marks] (b) Table 7 shows the electron arrangement for atoms W, X and Y.  Jadual 7 menunjukkan susunan elektron bagi atom W,X dan Y. Element W X Y

Electron arrangement 2.4 2.8.7 2.8.8.2 Table 7  Jadual 7 

Using the information in Table 7, explain how two compounds can be formed from these elements based on their electron arrangements. The two compounds should have different bond types.  Menggunakan maklumat dalam Jadual 7, terangkan bagaimana dua sebatian dapat  terbentuk dari unsur-unsur ini berdasarkan susunan elektron.  Dua sebatian ini mestilah berbeza jenis ikatan. [10 marks] (c) Compare the physical properties for both chemical compound formed in (b).  Bandingkan sifat-sifat fizikal bagi kedua-dua sebatian yang terbentuk dalam (b). [ 4 marks ]

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13

Table 8 shows the information on two type of acids.  Jadual 8 menunjukkan maklumat tentang dua jenis asid. -3

Acid  Asid 

Concentration (moldm )  Kepekatan (moldm-3 )

pH value  Nilai pH 

Hydrochloric acid, HCl  Asid hidroklorik, HCl

0.1

1

Ethanoic acid, CH3COOH  Asid etanoik, CH 3COOH 

0.1

4

Table 8  Jadual 8  (a)

One of the acids is a strong acid, while the other is a weak acid. Satu daripada asid tersebut ialah asid kuat dan satu lagi ialah asid lemah. (i) What are the definition for a strong acid and a weak acid?  Apakah takrifan bagi asid kuat dan asid lemah? [ 2 marks ] (ii)

Identify the strong acid and weak acid. Kenalpasti asid kuat dan asid lemah. [ 2 marks ]

(iii)

Explain why the pH values of the two acids are different.  Jelaskan tentang perbezaan nilai pH kedua-dua asid. [ 4 marks ]

(b)

(i)

What is the definition of molarity? State the formula and the unit of molarity.  Apakah takrifan kemolaran?  Nyatakan formula dan unit bagi kemolaran.

(ii)

-

[ 3 marks ] of hydrochloric acid

Explain how you would prepare 100.0 cm of 0.05 moldm -3 from 0.50 moldm of hydrochloric acid. 3 -3 Terangkan bagaimana anda menyediakan 100.0 cm  , 0.05 moldm asid hidroklorik  -3 daripada 0.50 moldm asid hidroklorik. [ 5 marks ] (iii) Calculate the volume of 40.0 gdm of sodium hydroxide solution required to neutralise the solution in b (ii). [Relative atomic mass: H=1; O=16; Na=23] -3 Kira isipadu bagi 40.0 gdm larutan natrium hidroksida yang diperlukan untuk  meneutralkan larutan dalam b(ii). [Jisim atom relatif: H=1; O=16; Na=23] [ 4 marks ]

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14 Section C [20 marks] Answer any one question from this section  Jawab mana-mana satu soalan dari bahagian ini

9

(a)

State 3 factors that affects the selective discharged of ions during electrolysis .  Nyatakan 3 faktor yang mempengaruhi pemilihan ion untuk nyahcas semasa elektrolisis. [ 3 marks ] (b) Diagram 9 shows the set-up of apparatus of two experiments to investigate the electrolysis process by using different electrodes.  Rajah 9 menunjukkan susunan radas bagi dua eksperimen untuk mengkaji proses elektrolisis dengan menggunakan elektrod-elektrod yang berlainan. Experiment  Eksperimen

Apparatus set-up Susunan radas

A

Copper electrodes

I

Elektrod kuprum 

Copper(II) sulphate solution Larutan kuprum(II) sulfat 

Carbon electrodes

II

Elektrod karbon 

Copper(II) sulphate solution Larutan kuprum(II) sulfat 

A

Diagram 9  Rajah 9 Compare the observation and product formed at the anode for both experiments  Bandingkan pemerhatian dan hasil yang terbentuk di anod bagi kedua-dua eksperimen. Write the half equation at the anode for both experiments. Tuliskan setengah persamaan di anod bagi kedua-dua eksperimen. [ 6 marks ]

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(c)

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15

Table 9 shows the voltage of chemical cell using metals A, B and C as the electrode.  Jadual 9 menunjukkan nilai voltan bagi sel kimia menggunakan logam A, B dan C sebagai elektrod. Pairs of metal Pasangan logam B/C A/C

Voltage (V)  Nilai voltan (V) 0.1 0.8

Positive terminal Terminal positif  C C

Table 9  Jadual 9 Based on the information given,  Berdasarkan kepada maklumat yang diberikan, (i)

(d)

state the voltage of a chemical cell using metal A and B as the electrodes. nyatakan nilai voltan yang akan dihasilkan oleh sel kimia yang menggunakan logam A dan B sebagai elektrod. (ii) state the negative terminal in (c)(i) and explain your answer. nyatakan terminal negatif pada (c)(i) dan terangkan jawapan anda. [ 3 marks ] A student has an inattractive ring and it is easy to corrode. To solve the problem, he uses an electrolysis process in a laboratory. Seorang pelajar mempunyai sebentuk cincin yang tidak menarik dan mudah berkarat. Untuk mengatasi masalah ini, dia menggunakan proses elektrolisis di dalam makmal . A student may used the apparatus and chemical as follow: Pelajar boleh menggunakan radas dan bahan kimia seperti berikut: Beaker, connecting wire and crocodile clip, battery, silver metal, silver nitrate solution,  Bikar, wayar penyambung bersama klip buaya, bateri, kepingan argentum , larutan argentum nitrat, Describe an experiment on how to solve these problem. In your description include a diagram to show the set-up of apparatus.  Huraikan satu eksperimen bagaimana untuk mengatasi masalah ini. Dalam penerangan anda sertakan gambarajah untuk menunjukkan susunan radas. [ 8 marks ]

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10

(a)

(i)

16

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What is meant by ‘salt’ ?  Apakah yang dimaksudkan dengan ‘garam’? [ 2 marks ]

(ii)

(b)

(c)

Name salt derived from Nitric acid • Hydrochloric acid •  Namakan garam yang dihasilkan dari  Asid nitrik  •  Asid hidroklorik  •

[ 2 marks ] The following are three examples of sulphate salts that can be prepared in the laboratory.  Berikut adalah tiga contoh garam sulfat yang boleh disediakan di dalam makmal. • Potassium sulphate, K2SO4 Kalium sulfat, K 2SO4 • Lead (II) sulphate, PbSO4 Plumbum (II) sulfat, PbSO4 • Zinc sulphate, ZnSO4  Zink sulfat, ZnSO4 (i) From these examples, identify the soluble and insoluble salts.  Daripada contoh-contoh ini, kenal pasti garam terlarutkan dan garam tak larut. [ 2 marks ] (ii) State the reactant for the preparation of the insoluble salt in 10(b)(i)  Nyatakan bahan tindak balas bagi penyediaan garam tak larut di 10(b)(i). [ 2 marks ] With the aid of a labelled diagram, describe the procedure of experiment to prepare the named insoluble salts by using the reactant in 10(b)(ii). Your answer should include the • list of materials and apparatus • chemical equation • ionic equation for the reaction.  Dengan bantuan gambarajah berlabel, huraikan langkah-langkah eksperimen untuk  menyediakan garam tidak larut yang dinamakan dengan menggunakan bahan tindak balas dalam 10(b)(ii).  Jawapan anda mestilah mengandungi • senarai bahan dan alat radas • persamaan kimia • persamaan ion bagi tindak balas. [12 marks] END OF QUESTION PAPER  KERTAS SOALAN TAMAT 

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17

INFORMATION FOR CANDIDATES MAKLUMAT UNTUK CALON

1. This question paper consists of three sections: Section A, Section B and Section C. Kertas soalan ini mengandungi tiga bahagian:  Bahagian A, Bahagian B dan B ahagian C.

2. Answer all questions in Section A. Write your answers for Section A in the spaces provided in the question paper.  Jawab semua soalan dalam Bahagian A. Tuliskan jawapan bagi Bahagian A dalam ruang yang disediakan dalam kertas soalan.

3. Answer one question from Section B and one question from Section C. Write your answers for Section B and Section C on the `writing paper’ provided by the invigilators. Answer questions in Section B and Section C in detail. You may use equations, diagrams, tables, graphs and other suitable methods to explain your answer.  Jawab satu soalan daripada Bahagian B dan satu soalan daripada Bahagian C. Tuliskan jawapan bagi Bahagian B dan Bahagian C pada kertas tulis yang disediakan. Jawab Bahagian B dan Bahagian C dengan terperinci. Anda boleh menggunakan persamaan, gambar rajah, jadual, graf  dan cara lain yang sesuai untuk menjelaskan jawapan anda.

4. Show your working. It may help you to get marks. Tunjukkan kerja mengira.Ini membantu anda mendapatkan markah.

5. If you wish to change your answer, neatly cross out the answer that you have done. Then write down the new answer. Sekiranya anda hendak membatalkan sesuatu jawapan, buat garisan di atas jawapan itu.

6. The diagrams in the questions are not drawn to scale unless stated.  Rajah yang mengiringi soalan tidak dilukiskan mengikut skala kecuali dinyatakan.

7. Marks allocated for each question or part question are shown in brackets.  Markah yang diperuntukkan bagi setiap soalan atau ceraian soalan ditunjukkan dalam kurungan.

8.

The time suggested to answer Section A is 90 minutes, Section B is 30 minutes and Section C is 30 minutes.  Masa yang dicadangkan untuk menjawab Bahagian A ialah 90 minit, Bahagian B ialah 30 minit dan Bahagian C ialah 30 minit.

9. You may use a non-programmable scientific calculator.  Anda dibenarkan menggunakan kalkulator saintifik yang tidak boleh diprogramkan.

10. Hand in your answer sheets at the end of the examination. Serahkan semua kertas jawapan anda di akhir peperiksaan.

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THE PERIODIC TABLE OF THE ELEMENTS

1

2

H Hydrogen 1

10 3

4

Li

Be

Lithium 7

Beryllium 9

11

Na

Helium 4

Symbol

Ne Neon 20

Name of element

12 Magnesiu m 24

19

20

21

22

K

Ca

Sc

Ti

Potassium 39

Calcium 40

Scandium 45

Titanium 48

5

6

7

8

9

10

B

C

N

O

F

Ne

Boron 11

Carbon 12

Nitrogen 14

Oxygen 16

Fluorine 19

Neon 20

13

Relative atomic mass

Mg

Sodium 23

14

Al Aluminiu m 27

23

V Vanadiu m 51

37

38

39

40

41

Rb

Sr

Y

Zr

Nb

Rubidium 86

Strontium 88

Yttrium 89

Zirconium 91

Niobium 93

55

56

Cs

Ba

Caesium 133

Barium 137

87

Fr Francium 223

He

Proton number

57

24

Cr

25

Mn

27

28

29

30

31

Fe

Co

Ni

Cu

Zn

Ga

Iron 56

Cobalt 59

Nickel 59

Copper 64

Zinc 65

Gallium 70

42

Mo

Tc

Ru

Molybden um 96

Technetiu m 98

Rutheniu m 101

44

Silicon 28 32

26

Manganes e 55 43

Chromium 52

Si

Ge Germaniu m 73

15

P Phosphor us 31

16

17

18

S

Cl

Ar

Sulphur 32

Chlorine 35

Argon 40

33

34

35

36

As

Se

Br

Kr

Arsenic 75

Selenium 79

Bromine 80

Krypton 84

45

46

47

48

49

50

51

52

53

54

Rh

Pd

Ag

Cd

In

Sn

Sb

Te

I

Xe

Rhodium 103

Palladium 106

Silver 108

Cadmium 112

Indium 115

Tin 119

Antimony 122

Tellurium 128

Iodine 127

Xenon 131

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

Lanthanu m 139

Hf 

Ta

W

Re

Os

Ir

Pt

Au

Hg

Tl

Pb

Bi

Po

At

Rn

Hafnium 179

Tantalum 181

Tungsten 184

Rhenium 186

Osmium 190

Iridium 192

Platinum 195

Gold 197

Mercury 201

Thallium 204

Lead 207

Bismuth 209

Polonium 210

Astatine 210

Radon 222

88

89

104

105

Ra

Ac

Unq

Unp

Actinium 227

Unnil− quadium 257

Unnil− pentium 260

58

59

Ce

Pr

Cerium 140

Praseo− dymium 141

Radium 226

La

90

Th Thorium 232

91

Pa Protactini um 231

106

107

108

109

Unh

Uns

Uno

Une

Unnil−hex ium 263

Unnilsepti um 262

Unnilocti um 265

Unnilenni um 266

62

63

Sm

Eu

Samarium 150

Europium 152

60

61

Nd

Pm

Neodymiu m 144

Promethiu m 147 93

92

U Uranium 238

Np Neptuniu m 237

94

Pu Plutonium 244

95

Am Americiu m 243

64

Gd

65

Tb

Gadoliniu m 157

Terbium 167

96

97

Cm

Bk

Curium 247

Berkelium 247

66

Dy Dyprosiu m 163 98

67

68

69

70

71

Ho

Er

Tm

Yb

Lu

Holmium 165

Erbium 167

Thulium 169

Ytterbium 173

Lutetium 175

99

100

Cf 

Es

Californiu m 249

Einsteiniu m 254

Fm Fermium 253

101

Md Mendelev ium 256

102

No Nobelium 254

103

Lr Lawrenci um 257

 Reference: Chang, Raymond (1991). Chemistry. McGraw−   Hill

4541/1, 4541/2 CHEMISTRY 1, CHEMISTRY 2 Oktober 2011

JABATAN PELAJARAN MELAKA BUKIT BARU, MELAKA ____________________________________________________________ PEPERIKSAAN AKHIR TAHUN TINGKATAN 4 2011

CHEMISTRY 1 CHEMISTRY 2

4541/1, 4541/2 CHEMISTRY 1, CHEMISTRY 2 Oktober 2011

JABATAN PELAJARAN MELAKA BUKIT BARU, MELAKA ____________________________________________________________ PEPERIKSAAN AKHIR TAHUN TINGKATAN 4 2011

CHEMISTRY 1 CHEMISTRY 2

PERATURAN PEMARKAHAN

Skema Pemarkahan ini mengandungi 10 halaman bercetak

2

MARKING SCHEME OF

CHEMISTRY  PAPER

1

1

C

11

D

21

D

31

C

41

A

2

D

12

A

22

D

32

B

42

A

3

C

13

D

23

C

33

C

43

C

4

A

14

A

24

B

34

B

44

C

5

A

15

B

25

C

35

A

45

D

6

D

16

B

26

A

36

D

46

B

7

B

17

A

27

B

37

B

47

C

8

A

18

C

28

B

38

A

48

B

9

C

19

A

29

C

39

D

49

D

10

D

20

B

30

A

40

B

50

C

3

MARKING SCHEME OF

CHEMISTRY  PAPER

Scheme

1.

(a)

(b)

Marks

(i) The number of protons in the nucleus of an atom

1

(ii) 16

1

(i) Q and R,

1

Q and R have same number of protons but different number of neutrons/ different nucleon number

2

Subtotal

2

1

(ii) 35

Q

1

17

37

Q

1

17

(c)

4

(i) 2.8.7

1

(ii)

R

(d)

Number of shells(3)

1

Number of electrons

1

3

1

1

Because S has 8 valence electrons // has achieved [stable] octet electron arrangement.

Total 10 m

4

2

a

b

c

d

Empirical formula is a chemical formula that shows the simplest ratio of the number of atom for each element in the compound Anhydrous Calcium chloride // concentrated sulphuric acid To ensure that the combustion tube has been filled with hydrogen gas The process of heating, cooling and weighing are repeated until a constant mass of substance and its container is obtained

1

1

1

1

1

1

1 2 1

e

Mass (g) No of mole Simplest ratio Empirical formula

f

Pb 4.14 n=4.14/207 =0.02 1

O 0.64 n= 0.64/16 =0.04 2

1 1 1

PbO2

Because Mg is at higher position than H in the electrochemical series.

1

4

1

1 Total 10m

3

a b

D -

has more than one oxidation number //  can act as catalyst//  can formed complex ion can formed coloured ion [ any one ] (i) A,B,C,D,E (ii) - Across the period, the proton number of  each atom increase - Nuclei charge in the nucleus increase - Force of attraction between nucleus and outermost shell become stronger //  outermost shell are pulled closer to the nucleus

c

d e

-

D A2O + H2O

2AOH

1

1

1

1

1 1 1

1

4

1

1

5

-

formula of reactant formula of product balance equation

1 1 1

3 Total 10 m

4

a b

c d

(i) 18 (ii) 2.8.8 (i) TU4 (ii) Covalent bond (iii) - low melting and boiling point//  - cannot conduct electricity in any state //  - insoluble in water // soluble in organic solvent. [any two of the above] (iv) - correct number of electron in each shell - four atom U combine with one atom T [ the atom is labelled] WU2 V // W // Y [ any one ]

1 1 1 1 1 1

2

1

6

1 1 1

1 1 Total 10m

5

a

b

c

(i)

Anode : Greenish yellow gas is released Cathode : Colourless gas is released (ii) - Insert a damp blue litmus at [the anode] - Blue litmus paper turn red and [bleached]

1 1 1 1

4

(i) Hydrogen + (ii) 2H + 2e → H2

1 1

2

(i) Functional diagram Labelled diagram – zinc strip, copper strip , copper(II) sulphate solution (ii) Zinc to copper through connecting wire (iii) Blue turn colourless

1 1 1 1

4 Total 10m

6

6

a

b

c

- Functional diagram with correct shaded solution in conical flask and burette - label of sodium hydroxide solution in conical flask  and hydrochloric acid in the burette

1

(i) - Phenolphtalein solution//  [ accept any suitable indicator solution ] (ii) pink to colourless (i) 21.00, 20.60, 20.80 (iii) =21.00 + 20.60 + 20.80 //  3 3 = 20.80 cm

1

d e

f

7

a

b

2 1

2 1 1

1

1

1

NaOH + HCl NaOH + H2O - correct formula and reactant MaVa = na MbVb nb

1

1

Ma x 20.80 = 1 1.0 x 25.0 1 -3 Concentration of HCl, Ma = 1.20 moldm

1 1

2

[ accept another suitable method ] Nitric acid

1

1 Total 10m

-

1 1 1 1 1 1

The electron arrangement of P atom is 2.4 and Q atom is 2.6. Q atom is in group 16 because it has 6 valence electron and it is in period 2 because it has 2 shells occupied with electron.

Ionic bond: - X atom has 7 valence electron and Y atom has 2 valence electron. - These electron arrangement are unstable. - To achieve a stable electron arrangement, Y atom 2+ donate 2 valence electron and form Y ions - 2 atom X receive 1 electron each and form X ions. 2+ - Y ion and X ions are attract to each other - to form an ionic compound with formula YX2

1 1 1 1 1 1

6

7

Covalent bond: - W atom has 4 valence electron and X atom has 7 valence electron. - To achieve a stable electron arrangement, one W atom share 4 valence electron with 4 atom X. - They will form 4 single covalent bond - with a formula WX4 c

Ionic compound 1. soluble in water 2. insoluble in organic solvent 3. conduct electricity in molten and aqueous state 4. high melting and boiling point

Covalent compound Insoluble in water Soluble in organic solvent Cannot conduct electricity in any state Low melting and boiling point

1 1 1 1

10

1 1 1 1

4

Total = 20m

8

a

(i). - strong acid is an acid which ionises /dissociates completely in water to produce a high + concentration of hydrogen ions, H

1

- weak acid is an acid which ionises / dissociates partially in water to produce a low + concentration of hydrogen ions, H

1

2

1 1

2

(ii). Strong acid - hydrochloric acid / HCl Weak acid - ethanoic acid / CH 3COOH

(iii). - hydrochloric acid ionises completely in water and produced high concentration of hydrogen ions - the high concentration of hydrogen ions causes the pH value to become lower - ethanoic acid ionises partially in water and produced lower concentration of hydrogen ions. - the lower concentration of hydrogen ions causes the pH value to become higher

1 1 1

1

4

8

b

(i). Molarity is the number of moles solute present in 3 1 dm solution. - Molarity = no of moles of solute (mol) 3 Volume of solution (dm ) - Unit , moldm

-3

1

3

1

(ii). - Calculation: M2 = 100 X 0.05 0.5 3 = 10 cm 3 -3 - Using pipette, 10.0 cm of 0.50 moldm of  hydrochloric acid is transferred to a 100 ml volumetric flask. - Distilled water is then added to the acid in the volumetric flask until near the calibration mark  - Add distilled water dropwise to the volumetric flask until water level exactly reach its calibration mark  - Stopper the flask and shake well the solution by up side down the flask to ensure thorough mixing

1

1 1 5 1 1

-3

(iii). - Molarity of NaOH =

40 gdm 23 + 16 + 1 -3 = 1.0 moldm

NaOH + HCl MaVa MbVb

1

NaCl + H2O

1 1

= na nb 4

-

0.05 X 100.0 1.0 X Vb

=

1 1

1

3

- Volume of NaOH, Vb = 5.0 cm [ Accept another suitable method ]

1

Total 20m

9

(a)

i. ii. iii.

concentration of ion type of electrode position of ion in electrochemical series

1 1 1

3

1+1 1+1 1+1

6

(b) I Anode becomes thinner Copper (II) ion + Cu  Cu + 2e

II Gas bubbles are released Oxygen 4OH  O2 + 2H2O + 4e

9

(c)

(i) 0.8 - 0.1 = 0.7V // 0.7V

1 1 1

(d)

(ii) - Electrode A, - A is more electropositive than B Procedure of experiment: i.

3

3

[50-200 cm ] dilute silver nitrate solution is poured into a beaker. ii. An iron ring is cleaned using sand paper. iii. Iron ring is connected to negative terminal of  battery // silver metal is connected to positive terminal of battery iv. Iron ring and silver metal is immersed into the silver nitrate solution v. The circuit is completed using connecting wire vi . Using small current/turn the ring steadily vii. Diagram: - Functional diagram contain two different metals as electrode ( no need with correct electrode) and the solution is shaded correctly. - iron spoon as cathode, silver as anode and silver nitrate solution are labelled.

1 1

1 1 1 1

1 8 1

Total = 20m

10

a

b

(i). - An ionic compound formed when the - hydrogen ion in an acid is replaced by the metal ion or ammonium ion

1

(ii) ● sodium nitrate / potassium nitrate etc ● silver chloride / sodium chloride etc

1 1

: potassium sulphate and zinc sulphate Insoluble salts : lead (II) sulphate

4

(i) Soluble salts

(ii) Lead (II) nitrate and sodium sulphate. [ any suitable and correct answer ] c

1

- Alternative Diagram : (i) Process of mixing the solution, contains: • Diagram shows the mixture of lead (II) nitrate in and sodium sulphate in a beaker with glass rod • shade the solution / mixture correctly

1 1 1+1

1 1

4

10

OR

OR

(ii) Diagram shows the filtration process, contains: ● Labelled; Lead (II) sulphate in filter paper (as residue), Sodium nitrate solution in the beaker (as filtrate and shaded ) ● The set of apparatus contain filter paper, filter funnel ( clamped at retort stand) and beaker. - Materials and apparatus: -3 [0.1 – 1.0moldm ] sodium sulphate solution, -3 [0.1 – 1.0 moldm ] lead (II) nitrate solution, 50 ml beaker, 50.0 ml measuring cylinder, rod, filter paper, filter funnel, conical flask. - Procedure: 3 -3 i. [ 50.0 cm of 0.5 moldm ] of sodium sulphate solution is measured using 50.0 ml measuring cylinder and pour into a beaker, A. 3 -3 ii. [50.0 cm of 0.5 moldm ] of lead (II ) nitrate solution is measured using 50.0 ml measuring cylinder and pour into another beaker, B. iii. Solution in beaker A is poured into the solution in beaker B. iv. Stir with glass rod, precipitate formed. v. The precipitate is filtered into a conical flask  using filter paper and filter funnel and rinsed the residue with distilled water vi. Dry the residue by pressing between two filter papers. - Chemical equation: Na2SO4 + Pb(NO3)2

1

1

1

1

1 1 1

1 1

PbSO4 + 2NaNO3

- Correct reactant and product - Balance equation

1 1 12

- Ionic equation: 2+ 2Pb + SO4

PbSO4

 END OF MARK SCHEME 

1

Total 20

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Nama Kelas JABATAN PELAJARAN MELAKA BUKIT BARU, MELAKA

PEPERIKSAAN AKHIR TAHUN TINGKATAN 4 2011

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CHEMISTRY Kertas 3 Oktober 2011

1 ½ jam

Satu jam tiga puluh minit

JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU

1. Tuliskan nama dan tingkatan pada ruang yang disediakan. 2. Kertas soalan ini adalah dalam dwi bahasa. 3. Calon hendaklah membaca arahan pada halaman 2 .

Untuk kegunaan pemeriksa sahaja Markah Markah Soalan Penuh diperolehi 1

33

2

17

Jumlah

50

Kertas soalan ini mengandungi 9 halaman bercetak  [Lihat sebelah

2 INFORMATION FOR CANDIDATES

1. This question paper consists of  two questions. Answer all questions. Kertas soalan ini mengandungi dua soalan. Jawab semua soalan. 2. Write your answer for Question 1 in the spaces provided in the question paper . Tulis jawapan anda bagi Soalan 1 pada ruang yang disediakan dalam kertas soalan ini. 3. Write your answers for Question 2 on the writing paper provided by the invigilators. Tulis jawapan anda bagi Soalan 2 pada kertas tulis yang disediakan. 4. You may use equations, diagrams, tables, graph and other suitable methods to explain your answer.  Anda boleh menggunakan persamaan , rajah, jadual, graf dan cara lain yang sesuai untuk menjelaskan jawapan anda. 5. Show your working, it may help you to get marks . Tunjukkan kerja mengira, ini membantu anda mendapatkan markah. 6. If you wish to change your answer, cross out the answer that you have done. Then write down the new answer .  Jika anda hendak menukar jawapan, batalkan jawapan yang telah dibuat. Kemudian tulis jawapan yang baru. 7. Marks allocated for each question or part question are shown in brackets.  Markah yang diperuntukkan bagi setiap soalan atau ceraian soalan ditunjukkan dalam kurungan. 8. The time suggested to answer each of the questions is 45 minutes .  Masa yang dicadangkan untuk menjawab setiap soalan ialah 45 minit. 9. You may use a non-programmable scientific calculator .  Anda dibenarkan menggunakan kalkulator saintifik yang tidak boleh diprogram. 10. Hand in your answer sheets at the end of the examination . Serahkan kertas jawapan anda di akhir peperiksaan.

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Answer all question  Jawab semua soalan For Examiner’s Use

A student carried out three experiments to study the reaction of alkali metal with water. Seorang pelajar menjalankan tiga eksperimen untuk mengkaji tindak balas di antara logam alkali dengan air.

1

Set up of apparatus Susunan alat radas Lithium  Litium

Observation of the alkali metal Pemerhatian terhadap logam alkali

Water  Air  Set I Sodium  Natrium Water  Air  Set II Potassium Kalium Water  Air  Set III Diagram 1.1  Rajah 1.1

(a)

Look at Diagram 1.1. Complete Diagram 1.1 by stating the observations for the reaction of  group 1 metals with water based on the movement on the water surface , flame and the sound produce. Perhatikan Rajah 1.1. Lengkapkan Rajah 1.1 dengan menyatakan pemerhatian bagi tindak  1(a) balas di antara logam kumpulan 1 dengan air berdasarkan kepada pergerakannya di atas  permukaan air, nyalaan, dan bunyi yang terhasil. 3 [3 marks]

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(b) Based on data in Diagram 1.1, complete the table below.  Berdasarkan data dalam Rajah 1.1, lengkapkan jadual di bawah. Name of variables Action to be taken  Nama pembolehubah Tindakan yang perlu diambil  Manipulated variable Method to manipulate variable Pembolehubah dimanipulasi Kaedah memanipulasikan pemboleh ubah ………………………………………...

...........................................................................

………………………………………...

…………………………………………………

………………………………………... Responding variable Pembolehubah bergerak balas

…………………………………………………. What to observe in the responding variable Perkara yang perlu diperhati dalam  pembolehubah bergerak balas

………………………………………... ............................................................................. ………………………………………... ............................................................................. ………………………………………...

………………………………………...

............................................................................. Method to maintain constant variable Kaedah untuk menetapkan pemboleh ubah dimalarkan .............................................................................

………………………………………...

.............................................................................

1(b)

………………………………………...

…………………………………………………. [3 + 3 marks]

6

Constant variable Pembolehubah dimalarkan

(c)

State the hypothesis for this experiment.  Nyatakan hipotesis bagi eksperimen ini. ....................................................................................................................................................... 1(c)

………………………………………………………………………………………................... [3 marks]

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(d) State two inferences based on the results of the reaction between lithium and water  Nyatakan dua inferens berdasarkan kepada keputusan tindak balas antara litium dengan air. …………………………………………………………………………………………………... 1(d)

…………………………………………………………………………………………………... [3 marks]

(e)

3

Based on the observation in Diagram 1.1, arrange lithium, potassium and sodium in descending order of reactivity towards water.  Berdasarkan pemerhatian dalam Rajah 1.1 , susunkan litium, kalium dan natrium mengikut  tertib kereaktifan logam terhadap air secara menurun. 1(e)

……………...…………………………………………………………………………………… [3 marks]

(f)

3

The experiment is repeated using a small piece of rubidium to react with water. Rubidium is an alkali metal which is placed below potassium in the periodic table.  Eksperimen diulangi menggunakan seketul kecil rubidium untuk ditindakbalaskan dengan air.  Rubidium ialah logam alkali yang terletak di bawah kalium dalam jadual berkala. Predict the observation for this experiment.  Ramalkan pemerhatian bagi tindak balas ini. 1(f)

...................……………………………………………………………………………………… [3 marks]

(g) The student continued the experiment to determine the pH value of the solution formed in the basin. Pelajar tersebut meneruskan eksperimen untuk menentukan nilai pH bagi larutan yang terhasil di dalam besen. Diagram 1.2 shows the reading of pH meter when the pH meter is dipped into the solution in the basin.  Rajah 1. 2, menunjukkan bacaan meter pH apabila meter pH dicelupkan ke dalam larutan di dalam besen.

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Set Set

Set-up of apparatus Susunan radas

pH value  Nilai pH 

13.13

pH meter  Meter pH  I

Litium hydroxide solution  Larutan litium hidroksida

pH value  Nilai pH 

13.43

pH meter  Meter pH 

II Sodium hydroxide solution  Larutan natrium hidroksida

pH value  Nilai pH 

13.63

pH meter  Meter pH 

III Potassium hydroxide solution  Larutan kalium hidroksida Diagram 1.2  Rajah 1.2

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For Examiner’s Use

(i)

Record the pH value to one decimal place for Set I, Set II and Set III. Catatkan nilai pH pada satu tempat perpuluhan bagi Set I, Set II dan Set III. Set I

: ………………………………………………………………………………

Set II : ……………………………………………………………………………… 1(g)(i)

Set III : ………………………………………………………………………………. [3 marks]

(ii)

3

Construct a table to record the pH value for Set I, Set II and Set III.  Bina satu jadual untuk merekod nilai pH bagi Set I, Set II dan Set III.

1(g)(ii)

[3 marks]

(iii)

3

State the operational definition for the alkali.  Nyatakan definisi secara operasi bagi alkali. .................………………………………………………………………………………… 1(g)(iii)

………….………………………………………………………………………………… [3 marks]

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For Examiner’s Use

(iv)

The following is a list of chemical substances with pH value:  Berikut ialah senarai beberapa bahan kimia dengan nilai pH  Chemical substance  Bahan kimia Ammonia solution, NH3  Larutan ammonia, NH 3 Potassium hydroxide solution, KOH  Larutan kalium hidroksida KOH  Sodium hydroxide solution, NaOH  Larutan natrium hidroksida NaOH 

pH value  Nilai pH 

10 14 13

Classify these substances into strong alkali and weak alkali. Kelaskan bahan-bahan ini kepada alkali kuat dan alkali lemah.

1(g)(iv)

[3 marks] 3

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For Examiner’s Use

2 Experiment  Eksperimen

Result  Keputusan

Molten lead(II)bromide Plumbum(II)bromida lebur 

Molten naphthalene  Naftalena lebur 

Bulb lights up  Mentol menyala

Bulb does not light up  Mentol tidak menyala

Diagram 2  Rajah 2 Diagram 2 shows the apparatus set-up for an experiment to compare the electrical conductivity between two types of chemical compound.  Rajah 2 menunjukkan susunan radas bagi satu eksperimen untuk membezakan kekonduksian elektrik di antara 2 jenis sebatian kimia. Refering to the situation above, plan a laboratory experiment to investigate the difference in electrical conductivity between an ionic compound and a covalent compound.  Merujuk kepada situasi di atas, rancang satu eksperimen dalam makmal untuk mengkaji perbezaan kekonduksian elektrik di antara sebatian ionik dan sebatian kovalen. Your planning should include the following aspects: Perancangan anda hendaklah mengandungi aspek-aspek berikut: (a) Problem of statement Pernyataan masalah (b) All the variables Semua pembolehubah (c) Hypothesis  Hipotesis (d) List of materials and apparatus Senarai bahan dan radas (e) Procedure Prosedur  (f) Tabulation of data Penjadualan data

2

[17 marks] [17 markah] END OF QUESTION PAPER  KERTAS SOALAN TAMAT 

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4541/3 Chemistry 3 Oktober 2011

JABATAN PELAJARAN MELAKA BUKIT BARU, MELAKA ____________________________________________________________

PEPERIKSAAN AKHIR TAHUN TINGKATAN 4 2011

CHEMISTRY 3

PERATURAN PEMARKAHAN

Skema Pemarkahan ini mengandungi 11 halaman bercetak

2 MARKING SCHEME OF PAPER 3 Question

Details

Score

[Able to state all the observations correctly] Sample answer :

Set

1(a)

Observation

I

Lithium moves slowly on the water surface

II

Sodium moves faster on the water surface with a hissing sound and ignites with a yellow flame.

III

Potassium moves vigorously on the water surface with a hissing and ‘pop’ sound and ignites with a lilac flame

3

[Able to state any  two observations correctly] [Able to state any  one observation incompletely]

2

[No response given or wrong response]

0

1

[Able to state three variables and the way to control them correctly] Sample answer:

Manipulated variable: Type of alkali metals Responding variable: 1 (b)

Reactivity of alkali metals Fixed variable:

Use different type of alkali metals 6 Observe the reactivity of alkali metals when react with water Use water // same size of metals in each experiment .

Water// size of alkali metals [Able to state any 5 of the above information correctly] [Able to state any 4 of the above information correctly ] [Able to state any 3 of the above information correctly] [Able to state any 2 of the above information correctly ] [Able to state at least 1 of the above information correctly ] [No response given or wrong response]

5 4 3 2 1 0

3 Question

Details

Score

[Able to state the relationship between the manipulated variable and the responding variable correctly with direction] Sample answer :

3

When going down Group 1, alkali metals become more reactive in their reactions with water //  The lower the position of an alkali metal in the Periodic Table, the more reactive it is when reacts with water

[Able to state the relationship between the manipulated variable and the responding variable]

1 (c)

Sample answer :

2

The lower position of an alkali metal in the Periodic Table, the more reactive is the metal. [Able to state an idea of hypothesis] Sample answer :

Alkali metal have different reactivity. Alkali metal reacts with water

[No response given or wrong response]

1

0

[Able to state two inferences correctly ] Sample answer : 1. Lithium is the least reactive metal towards water 2. Lithium hydroxide is formed. 3. Hydrogen gas is released 4. Alkali solution is produced

1 (d)

3

[Able to state one inference correctly] Or  [Able to state two inferences incompletely] [Able to state an idea of inference]

2

Sample answer : Reaction occurs

1

[No response given or wrong response]

0

4

Question

Details

Score

[Able to arrange the position of all metals in descending order of  reactivity correctly] Sample answer :

3

Potassium/K, Sodium/Na, Lithium/Li [Able to arrange the position of at least two adjacent metals in descending order of reactivity correctly]

1 (e)

Sample answer: Lithium/Li, Potassium/K, Sodium/Na //  Sodium/Na, Lithium/Li , Potassium/K

2

[ Able to give an idea to arrange the metals] Sample answer: Lithium/Li, Sodium/Na, Potassium/K Potassium/K Lithium/Li, Sodium/Na, Sodium/Na, Potassium/K , Lithium/Li

1

[No response given or wrong response]

0

[Able to predict the observation for the reaction between rubidium and  water correctly ]

3 Sample answer: Rubidium moves more vigorously / violently / produces white fume. [Able to predict the observation for the reaction between rubidium and  water]

1(f)

Sample answer: Rubidium moves vigorously.

2

[Able to state an idea to predict the observation for the reaction between rubidium and water] Sample answer: Rubidium is more reactive. [No response given or wrong response]

1

0

5

Question

Details

Score

[Able to record all the pH meter reading with one decimal place accurately]:

1 (g)(i)

Sample answer: Set I : 13.1 Set II : 13.4 Set III : 13.6

3

[Able to record any  two readings accurately] Or  [Able to record all the pH meter readings without one decimal place correctly] [Able to record at least one reading correctly] [No response given or wrong response]

2

1 0

 Able to construct a table to record the pH value for Set I, Set II and  Set III of experiment that includes the following : 1. Correct titles 2. pH values Sample answer:

1(g)(ii)

Set

pH

I

13.1

II

13.4

III

13.6

3

 Able to construct a table that contains the following:

1. Titles 2. pH values Sample answer:

pH

I

13.1

II

13.4

III

13.6

 Able to construct a table with at least one title/reading. [No response given or wrong response]

2

1 0

6

Question

Details [Able to state the operational definition for alkali correctly] Sample answer: pH value that is more than 7 when pH meter is dipped into a solution.

Score

3

[Able to state the operational definition for alkali incompletely]

1(g)(iii)

Sample answer: pH value that is more than 7.

2

[Able to state an idea of operational definition for alkali ]

Sample answer: pH that is 13.

1

[No response given or wrong response]

0

[Able to classify all the substances correctly] Sample answer:

1(g)(iv)

Strong alkali Sodium hydroxide solution Potassium hydroxide solution

Weak alkali Ammonia solution

[Able to classify any  two substances correctly] [Able to classify any  one substance correctly] [No response given or wrong response]

3

2 1 0

7 Question

Details

Score

 Able to give the problem statement accurately and in question  form.

3 Sample answer: What is the difference in electrical conductivity between ionic compound and covalent compound?  Able to give the statement of the problem correctly.

2 2(a)

Sample answer: How does different type of chemical compound affect the electrical conductivity?  Able to give an idea of statement of the problem .

Sample answer: To investigate the electrical conductivity between different type of  chemical compound.

1

 No response or wrong response

0

 Able to state all the three variables correctly.

2(b)

Sample answer: Manipulated variable: Type of chemical compound/ molten lead(II)bromide and molten naphthalene Responding variable : Electrical conductivity / the light of  the bulb Controlled variable : Mass/state of the chemical compound //  lead(II)bromide and molten naphthalene  Able to state any two variables correctly  Able to state any one variable correctly  No response or wrong response

3

2 1 0

8 Question

Details

Score

 Able to state the relationship between the manipulated variable and  the responding variable correctly with direction.

Sample answer: Molten ionic compound / lead(II)bromide can conduct electricity /  while molten covalent compound / molten naphthalene cannot conduct electricity

3

 Able to state the relationship between the manipulated variable and  the responding variable with direction .

2(c)

Sample answer: Ionic compound can / cannot conduct electricity while covalent compound cannot / can conduct electricity  Able to state the idea of the hypothesis.

2

Sample answer: Different compound have different property of electrical conductivity.

1

 No response or wrong response

0

9 Question

Details

Score

 Able to give adequate list of materials and apparatus.

Sample answer: Materials 1 Lead (II) bromide 2 Naphthalene Apparatus 1 Crucible 2 Batteries 3 Bulb 4 Switch 5 Carbon electrodes 6 Tripod stand 7 Bunsen Burner 8 Pipe-clay triangle 9 Connecting wire

3

 Able to give a list of materials and apparatus.

2(d)

Sample answer: Materials 1 Lead (II) bromide 2 Naphthalene Apparatus 1 Crucible / Any container 2 Batteries 3 Bulb/voltmeter/ammeter 4 Electrodes 5 Bunsen Burner 6 Connecting wire

2

 Able to give an idea of materials and apparatus.

Sample answer: Material Lead (II) bromide / naphthalene Apparatus 1 Any container 2 Batteries 3 Ammeter / bulb / voltmeter 4 Electrodes 5 Bunsen burner  No response or wrong response

1

0

10 Question

Details

Score

 Able to state the following steps:

Sample answer: 1 Fill a crucible with a solid lead(II)bromide, PbBr 2 until it is half full. 2 Complete the circuit. 3 Heat the solid lead(II)bromide until it melts. 4 Observe whether the bulbs light up or not. 5 Record the observation. 6 Repeat steps 1 to 5 / the experiment using naphthalene.

3

 Able to state at least the following steps:

2(e) Sample answer: Steps 2, 3,5 and 6 

2

 Able to state at least the following steps:

Sample answer: Step 2, 3 and 5

1

 No response or wrong response

0