Skema Jawapan Kimia p3

SULIT PROGRAM PENINGKATAN PRESTASI AKADEMIK

4541/3

SIJIL PELAJARAN MALAYSIA 2010 Kimia

Kertas 3

SKEMA JAWAPAN PEPERIKSAAN PERCUBAAN SIJIL PELAJARAN MALAYSIA 2010

KIMIA Kertas 3  PERATURAN PEMARKAHAN

UNTUK KEGUNAAN PEMERIKSA SAHAJA

Peraturan Pemarkahan ini mengandungi mengandungi 10 halaman bercetak

4541/3@ Hakcipta Jabatan Pelajaran Negeri Selangor 

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4541/3

SKEMA JAWAPAN KERTAS KIMIA 3 (4541/3) PPPA(2) SPM 2010 MARKING SCHEME OF PAPER 3 (4541/3) 3 (4541/3) PPPA(2) SPM 2010 

Question 1 (a)

Rubric

Score

  Able to state state three variables correctly] [ Able

Sample answer: Manipulated variable: Different /types of metals in contact with with iron

3

Responding variable: variable: The intensity of pink and blue blue colouration//  intensity of blue colouration  // rusting of iron Constant variable: Iron nails//temperature of jelly s olution  Able to state any 2 variables correctly ] [ Able  Able to state any 1 variable correctly ] [ Able  No response or wrong response ] [ No

Question 1 (b)

Rubric

2 1 0

Score

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

Sample answer:

3

When a more/less electropositive metal in contact with iron, the metal inhibits/speeds up rusting.

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

Sample answer:

2

The more/less electropositive electropositive metal inhibits/speeds up up rusting  //The rusting of iron is inhibits/speeds up, when a more/less electropositive metal in contact with iron//  [ Able  Able to state an idea of hypothesis ] Sample answer:

1

The electropositivity of metals affect the rusting r usting of iron  No response given or wrong response ] [ No

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Question

Rubric

1(c)

4541/3 Score

 Able to state the inference inference based on the observation correctly] [ Able

Sample answer: Test tube

A

Inferences

The iron nail does not rust//  Iron(II) ion is not present

B The iron nail does not rust //  Iron(II) ion is not present

C The iron nail rust a lot //  Iron(II) ion present

D The iron nail rust a little//  Iron(II) ion present

 Able to state any three or  two [ Able  two inferences correctly]

[ Able  Able to state any one inference correctly]  No response given or wrong response ] [ No

Question

3

Rubric

2 1 0

Score

 Able to state the operational definition definition for rusting correctly correctly ] [ Able

Sample answer:

3

Rusting of iron is the formation formation of blue colouration when iron is in contact contact with less electropositive metals metals or without contact with any any metals

 Able to state the operational definition in correctly ] [ Able 1(d )

Sample answer: Rusting of iron is the formation of blue colouration when iron is in contact with different metals

2

 Able to state an idea ] [ Able Sample answer: Rusting of iron is the formation for mation of blue colouration

1

[ No response or wrong response ]

0

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Question

Rubric  Able to compare the intensity int ensity of blue colour and relate the intensity [ Able 2+ of blue colour with concentration concentration of Fe accurately ]

4541/3 Score

Sample answer:

1(e)

The intensity of blue colouration after three days is higher. The concentration concentr ation of iron(I iron(II) I) ions ions is higher  Able to compare the intensity of blue colour and relate the intensity [ Able 2+ of blue colour with concentration concentration of Fe correctly]

3

Sample answer:

The intensity of blue colouration after three days is higher. The number iron(I iron(II) I) ions is higher

2

 Able to state an idea of the intensity of blue colour and relate the [ Able 2+ intensity intensit y of blue colour with with concentration of Fe correctly] Sample answer:

Question

The intensity of blue colouration after three days is higher //The number iron(II) ions after three days is higher

1

No response or wrong response

0

Rubric [ Able  Able to arrange all the 4 metals according to ascending order of  electropositivity electropositivity correctly] Sample answer:

Score

3

R, Iron, Q, P

  Able to arrange all the 3 metals according to ascending order of  [ Able electropositivity electropositivity correctly] 1(f )(i)

Sample answer: R, Q ,Iron, P // Iron R, Q, P // R, Iron, P, Q

2

[ Able   Able to arrange all the metals but according to descending descending order  of electropositivity electropositivity correctly correctly] Sample answer:

1

P, Q, Iron, R [ No response or wrong response ]

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SULIT Question

5 Rubric  Able to predict the metals metals which which cause the intensity intensity of blue [ Able colour very high accurately ] Sample answer:

Copper/silver 1(f)(ii)

 Able to predict the metals metals which which cause the intensity intensity of blue [ Able colour very high correctly ]

4541/3 Score

3

2

Sample answer:

Lead  Able to predict the metal below iron in the electrochemical electrochemical series [ Able of metals ]

1

Sample answer:

Tin  No response or wrong response ] [ No

Question

Rubric  Able to make the classification classification of electropositive electropositive metals and less less [ Able electropositive electropositive metals than t han iron accurately]

0

Score

Sample answer:

More electropositive electropo sitive metals : Magnesium, zinc Less electropositive electro positive metals : Lead, copper

3

1(g)  Able to make the classification classification of one more electropositive metals [ Able  and one less electropositive metal ]

2

 Able to make the classification classification of of more electropositive metals metals less [ Able electropositive electroposit ive metals inversely ]

1

Sample answer:

Less reactive metals : Magnesium, zinc More reactive metals : Lead, copper [ No  No response or wrong response ]

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SULIT Question 1(h)(i)

6 Rubric Able to state all the correct observations] [  Able

4541/3 Score 3

Sample answer:

(i) (ii)

At negative terminal: electrode becomes thinner At positive terminal: eelectrode lectrode becomes becomes thicker//  brown solid deposited (iii) At copper(II) sulphate sulphate solution: intensity of blue solution decreases//  blue solution turns pale blue  Able to state  any two correct observations ] [ Able  Able to state  any one correct observation ] [ Able  No response or wrong response ] [ No

Question

1(h)(ii)

Rubric [  Able to state all the voltmeter readings  accurately with correct unit  and one decimal point] point ] Sample answer: Q and Iron : 1.4 V P and Iron : 2.2 V R and Iron : 3.4 V

2 1 0

Score

3

 Able to state all the voltmeter readings accurately without unit] [ Able unit ]

Sample answer: Q and Iron : 1.4 P and Iron : 2.2 R and Iron : 3.4

2

 Able to state at least two readings correctly without unit ] [ Able  No response or wrong response ] [ No

1 0

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SULIT Question

7 Rubric   Able to construct a table to record the voltmeter reading for each pair  [ Able of metals that contain:] 1. Correct titles with unit 2. Readings

4541/3 Score 3

Sample answer: 1(h)(iii)

Question 2(a)

Pairs of metals Q and Iron P and Iron R and Iron

Voltage / V 1.4 2.2 3.4

 Able to construct a less accurate table that contains] [ Able 1. Titles without unit 2. Readings

2

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

1 0

Rubric [ Able  Able to state the problem statement correctly]

Score 3

Sample answer:

How does temperature effect the rate of reaction between sulphuric sulphuric acid and sodium thiosulphate solution ? [ Able   Able to state the problem statement less accurately ]

2

Sample answer:

How does temperature temperature effect the reaction between between sulphuric sulphuric acid and sodium thiosulphate solution ? // To investigate the effect of  temperature on the rate of reaction between sulphuric acid and sodium thiosulphate solution   Able to give an idea of the problem statement ] [ Able

1

Sample answer:

Temperature effect the rate of reaction [ No  No response or wrong response ]

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SULIT Question 2(b)

8 Rubric Able to state the three variables correctly] [  Able

4541/3 Score 3

Sample answer:

Manipulated variable Temperature of sodium thiosulphate solution Responding variable Time taken for the mark ‘X’ to disappear from sight// rate of  reaction Constant variable Volume and and concentration of sulphuric acid acid sodium thiosulphate thiosulphate solution // size of conical flask. [ Able  Able to state any two variables correctly ]  Able to state any one variable correctly ] [ Able  No response or wrong response ] [ No

Question 2(c)

Rubric   Able to state the relationship correctly between the manipulated  [ Able variable and the responding variable with direction ]

2 1 0

Score 3

Sample answer:

The higher higher the temperature temperature of sodium sodium thiosulphate thiosulphate solution solution the higher the rate of reaction/time taken for the mark ‘X’ to disappear  from sight relationship between the manipulated variable [  Able to state the relationship and the responding variable with direction ]

2

Sample answer:

The higher higher the temperature temperature of sodium sodium thiosulphate thiosulphate solution solution the faster the rate of reaction/time taken for the mark ‘X’ to disappear  from sight //The higher the temperature the higher the rate of  reaction [ Able   Able to state the idea of of hypothesis]

1

Sample answer:

Different temperature different rate of reaction r eaction  No response response or wrong wrong response

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SULIT Question 2(d)

9 Rubric  Able to give complete list of substances and apparatus ] [ Able

4541/3 Score 3

Sample answer:

Substances -3 Sodium thiosulphate solution [0.1 - 0.5] mol dm , sulphuric acid [0.2 –  [0.2 – 1.0] 1.0] mol dm-3 Apparatus Conical flask [150  –  250] cm3, measuring cylinder, thermometer, Bunsen burner, filter paper/white paper, tripod stand, wire gauze, stopwatch  Able to give a list of substances and apparatus but less complete ] [ Able

2

Sample answer:

Substances Sodium thiosulphate solution, sulphuric acid Apparatus Conical flask, thermometer, stopwatch  Able to give at least one substance and at least one apparatus ] [ Able [ No  No response or wrong response ]

Question 2(e)

Rubric  Able to list all the steps correctly correctly ] [ Able

1 0

Score 3

Sample answer:

1. 50 cm3 of sodium thiosulphate solution is poured into into a conical flask. 2. The temperature of the solution is recorded. 3. The conical flask is placed on top of a piece of white paper with a mark ‘X’ at the centre. 4. 5 cm3 of sulphuric acid is added into the conical flask and the stopwatch is started immediately. 5. Swirl the conical flask and record recor d the time taken for for the mark  ‘X’ to disappear disappear from from sight. sight. 6. Repeat steps 1 to 5 by heating the sodium thiosulphate solution at different different tempe t emperatures. ratures.   Able to list down steps 1, 4, 5 and 6 ] [ Able  Able to list steps 1, 4 and 5 ] [ Able [ No  No response or wrong response ]

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SULIT Question 2(f)

4541/3

10 Rubric  Able to tabulate the data with the following aspects ] [ Able 1. Correct titles

Score 2

2. List of minimum three temperature temperature Sample answer:

Temperature / oC 30 35 40

Time / s

 Able to construct table with at least one title incomplete list of  [ Able temperature ]

1

Sample answer:

Temperature

Time

 No response or wrong response or empty table ] [ No

0

END OF MARKING SCHEME SKEMA JAWAPAN TAMAT 

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