CSEC Chemistry June 2009 P1

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CSEC Chemistry June 2009 Paper 1

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r CHEMISTRY

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PaperOl - General Proficiency

75 minutes

READ THE FOLLOWING DIRECTIONS CAREFULLY

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In addition to th is test booklet, you should have an answersheet.

2.

Each item \n this test has four suggested answers lettered (A), (B), (C), (D). Read each item you are about to aryswer and decide which choice is best.

3.

On your answer sheet, find the numberwhich corrCspOnds to your item and shade the space having the same letteras the answer you have chosen. Look at the sample item below . Sample Item

The SI unitoflength is the (A)

(B) (C)

(D)

Sample Ans\.ver

kilogram metre newton second

The best answer to this item is "metre", so answer space (B) has been blackened.

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4.

[fyou want to change your answer, be sure to erase your old answer completely and fill in your new choice.

5.

When you are told to begin, tum the page and work as quickly and ascareli.Iily as you can Ifyou cannot answer an ite111, om it it and go on to the next one. You can come back to the harder item !ater. Your . score will be the total number of correct answers.

,6..

-.Y.mul.l.llY do any roc1gh work in this booklet

7.

Figures arc not necessarily drawn to scale

8_

The use of silent electronic calculators is a!lo..,ved

9.

T~ is test

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consists of60 items. You v.;i l I have 7 5 minutes to answer them

Do not be ccncerni::d that rhe ansv·ier sheet ~ro· . ides spaces for more ans,vers than there are items in

th1stest DO NOT TURN THlS PAGE Ui'iT11- YOU ARE TOLD TO DO SO

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[ [terns 1 - 2 re::~r resented

(A)

(8) (C) (DJ

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the following atoms rep-

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by their electronlc configuration.

LARGEST numberof mo ks of electrons co liberate one mole of it?

2,4 2, 8

(A)

2,8,6 2,8,8,2

(B)

(C) (D)

M.atch each item below with one of the options above. Each option may be used more than once, once or not at all.

6.

Which element l.

combines with chlorine to fonn ionic bonds?\,·

2.

f®ns many giant structures occuring both naturally a.>d artificially? 1

3

In-which cif the following are radioactive isotopes NOT used? (A) (B)

\GJ. (D)

Which of che followin~- requires the

Radiotherapy Carbon dating Metal extraction Energy generation

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(A)

1 atom ofthe element theelementwhichcontains6.0x JOD atoms

(C) (D)

the element which occupies24.0 dm' at s.t.p. the element which combines completelywith 12gofcarbon-12

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Hydrogen

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Nitrogen Chlorine

The ionic equation for the reaction between an acid and a carbonate may be represented as (A) H•(aq) + CO,'"(aq) -+ HCO ,_(aq) (B) 2H.(aq) + Co,'·(aq) -+ H,CO,(aq)

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Which of the following can be referred to as a standard solution? (A) (B) ,(C)

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Iodine in 50 cm' ethanol Sodium chloride in 50 cm' water 30 g of sodium chloride in water 30 g of iodine in 50 cm' ethanol

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(D) W(aq) + CO,'"(aq) ~ C0 2 (g)+H,O(I)

'One mole ofatoms of an element' refers to the mass of

\13}.

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Oxygen

(C) 2H'(aq) + CO,'"(aq)-+ C0 2 (g)+H,O(l)

4.

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Cu 2"'"

Which ofthese elements has seven electrons in its outer shell? (A) (B) (C) (D)

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9 refers to [hr! follo-.\.' 1 ng illustrations of the electronic structure of fo;..1r :ltoms

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(CJ (D)

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P and

Q

P and S Q and S Q and R

Wbicb oftbe following is tbe type of crystal structure of iodine at room temperature and pressure?

11.

A metallic bond is formed when (A)

(A)

Ionic

(B)

(BJ

Metallic Giantmolecular Simplemolecular

(C)

(C) '(EQ

(D)

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Whicb pair of atoms forms covalent bonds wben reacted togetber?

(A), (13)

10.

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cations are held together by a sea of mobile electrons positive metal ions are held together byaseaofanions anions are held to~ether by negative electrons metal atoms are held together by molecular forces

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4lt~m l~ refer:, to the follo\.v1nggraph \Vh1ch sho\VS the boiling points of some straight-

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\V h 1ch Gf t...11~ follo\v ing separ·.:i.uon [ech n iques

is NOT used during the extr.1.~tion of sucrose from sugar cane?

charn alcohol~:

(A) (B)

(C) (D)

15.

1

12.

2

3

The MOST suitable method for separating the4-carbon alcohol from a mixture with the 5-carbon alcohol is

(A) (B)

(C) (D)

(C) (D)

16.

fractional distillation solvent extraction simple distillation simple evaporation

(A) (B) (C)

Which ofthe following is the correctfomnula for ammonium carbonate? (A)

NH.co,

(BJ

NH, (C0 3 ) 2

(C)

(NH,) 2 CO,

(D)

(NH,) 2 (C0 3 ) 2

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Catalyst Pressure Stining Temperature

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A piece ofcalcium is added to some distilled water in a contaii:ier and a gas is produced_ The gas produced is expected to

(D) 13.

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Which of the following does NOT affect the solubility of a substance?

(A) (B)

4 5 6 7 Number of Carbon Atom1 In. Cllain

Filtration Precipitation Centrifugation Chromatography

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relightaglowingsplint give a 'pop'with a lighted splint decolourize acidified aqueous potassium manganate (VII) tum acidified aqueous potassium dichroITlategreen

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17.

·Which set of elements has atoms with two elecq-ons in their outer shells?

(A) (B) (C) (D)

The halogens Period2elements Group II elements Thetransitionelements

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filrn:-; lS - 19 substances. (A)

(B) (C) (D)

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to tht:: fol1ov.. 1ng rypesof

lti!ms 22 -2J refer to the chemicals

Salt Base Alkali Acid

_(A)

(BJ (CJ (D)

foliO\.vtr:i.g

Calcium carbonate Magnesium metal Barium chloride Litmus solution

Match each item below with one of the optionsabove. Eachoptionmaybeusedmore than once, once ornotat al I.

In answering items 22 - 23, a particular choice from the above may be made more than once, once or not at all.

18.

The oxide ofa metal

Which ofthese chemicals

19.

Supplies protons as the only positive ions in aqueo1:15 solutions

20.

When X and Y are stirred together in a beaker and the mixture filtered, and are both present in the filtrate. Which ofthe following could describe the mixtµre formed by Xand Y?

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x

II.

Solution Colloid

Ill.

Suspension

(A) (B) (Cj

!only III only land II only II and III only

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(D)

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22.

reacts with an acid, liberating a gas which tumslimewatermilky? / \

23.

reacts with sulphuric acid to produce hydrogen gas?

24.

Acidified potassium manganate (VII) is

y

(A) (BJ (C) (DJ

an oxidising agent a reducing agent a dehydrating agent both an oxidising and reducing agent

Which ofthe following compounds are acid salts? I [],

Ill. IV

(A) (B) (CJ (D)

NaH,PO, Caso, Al,Co, KHSO, land II only land r; only II and m only m and IV only

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nn nN Tn THl'. NP"lCu'•+ 2e· Cu 2 ,_ + 2e·--+ Cu 2H' + 2e·-> H, 40H· - 4e·-> 2H,O + O,

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Aluminium is the anode in the eel!. Hydrogen is given off at the anode. Theeloctrolyte is a solution of sodium chloride A layer of aluminium hydroxide forms on the pot.

Items 36 - 37 refer to the following sequence of reactions involving iron compounds, where I, II, Ill and IV represent the stages involved.

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I II FeCO, ----+ FeO ----+Fe,O,

36.

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(Bl. (C) {D)

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(BJ

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A suitable reagent that col.lid be used at N is (A) (B) (C)

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steam hydrogen solidcopperoxide aqueoussodiumhydroxide

IV

Density Hardness Melting point Electrical conductivity

40.

of

Which the following metals will react MOST vigorously with diluteacid?

cl\.)

Zinc

(B)

Iron

(C)

Lead Copper

(D)

Chlorine can be obtained by (A)

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N Fe 2 (SO,), - - - > Fe(OH),

I II

A recently discovered element is thought to be a metal. Which of the following physical properties would BEST confirm this? (A) (B) (C)

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In which stage is the oxidation state of iron increased? (A)

38.

ID

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warming sodium chloride vvith concentrated sulphuric acid boiling sodium chloride \Vith manganese (IV) oxide electrolysing a concentrated so Ju ti on ofsodium chloride adding aqueous bromine to aqueous sodium chloride

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!tt:rn 41 rcL:rs to the properties of four metals,\\/, X, \' anc.l Z, \.Vh1ch Jre summaris-::J in Lhe follovv1ng t.1blt: •

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No reaction

Metal, NO, and 0 2

x

Reacts with steam but not with cold water

Oxide, N0 2 and 0 2

y

Reacts rapidly with cold water

Nitrite and 02

·z

Reacts slowly with cold water

Oxide, N0 2 and 0 2

41.

(A)

W,X,Y,Z

(B)

X, Y,Z, W

(C)

Y,Z, W,X Y,Z,X, W

Item 42 refers to the following types of chemical reactjons which occur in the carbon cycle.

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43.

Decomposition Combustion Photosynthesis

((:0 ID)

(C)

I only !II only [and[! only l,lland][!

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Aluminium is higherup in the activity serie: than iron, therefore it is more resistanttc corrosion than iron. Bothmetalsformoxidecoatsbutaluminiurr oxide prevents further reaction, whih the iron oxide does not. Both metals form hydroxide coats butth• aluminium hydroxide prevents furthe reaction, while the iron hydroxide doe

not (D)

44.

Aluminium is lowerthan iron in the activit. series, therefore it reacts less read ii with air than iron.

Which of the following substances fonns dens white fumes \vi th ammonia gas? (A) (B) (C) (D)

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1um1n1umartic .. ·1 es donot d eter1orate1r .• Ov ert1me,a air as do iron articles. Which of the followin~ statements gives the correct reason forth is? (A)

Which of these reactions would be responsible forretuming carbon d iox.ide to the atmosphere? (A) (B)

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(B) 42.

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The order ofreactivity ofthese metals, with the _MOST reactive first, is

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Products formed when nitrate is heated

Reaction '"ith water/steam

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()x-ygen

1--Iydrogen Nitrogen dioxide 1--lydrogenchloride

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to the follov,,1ing equarion

H

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H

H

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H + Br2

~

X

Which is the correct structural formula for X?

(A)

(Ii)

(C)

(D)

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c

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H I

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B

H

H

I

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H I

H-C-C-C -C -H I

I

Br

Br

H

I H

H

H

H

H

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H-C-C-C -C -H I

I

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H

Br

Br

H

H

H

H

H

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H-C-C-C-C -H I

I

Br

H

H

Br

H

H

H

H

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H-C-C-C.-C -H I

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H

Br

H

Br

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[ - I2 Item -48 refers to the fc.ilowing structure:>

The compound, ethene, is described as being unsatura[cd. This means that the (A)

(B)

(C) (D)

caJbon atoms in etheneare linJ(ed by single bonds molecule has insufficient hydro gen atoms carbon atoms in the molecule are very reactive molecule contains at least onedouble bond

[.

B

H

H

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H-C - C

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H -C- II

I H

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H-C-H

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All members of a homologous series have similar

II.

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H-C-C-C-H (A)

(Bl (C) · (D)

densities boilingpoints chemical properties physical properties

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H-C - C-ll

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H-C-C-H

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48

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Which structures represent branched alkanes? (A) (B) (C) (D)

land U only I and TV only ill and JV only I, JI an_d ][]only

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organic compounds, I and II, of molecLilar formulz

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H-C-C-C-H

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H-C-C-C-OH

OH H I

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49.

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(C) (D)

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II

Compounds I and II are known as the (A) (B)

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isomersofC,H,O isotopes ofC,H.O condensed formulae ofC,H,O , molecular formulae of C,H,O

Items 50-51 refer to the following compounds.

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II. III. IV.

52.

Fats Nylon Proteins Terylene

(A) (BJ (C)

53.

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51

Lime water Lightersplint Bromine water Potassium dichromate

Which ofthe above compounds are synthetic? (A) (B) (C)

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Which of' the following is used in the breathalyser tesi to detect the presence of alcohol?

JP)_. 50.

c. . f-1~0, \Vith the fol)ov..·1ng

land II only land III only llandII!only II and IV only

aqueous ethanoic acid and magnesium?

(AJ

(BJ

Ester linkage exists in

(AJ (BJ JC}/

(D)

Which equation BEST represents the balanced equation forthe reaction between

!Ilonly land III only [and!Vonly [[and IV•,nly

CH,COOH(aq) + Mg(s) -> CH,COOMg(aq)+ H,(g) 2CH,COOH(aq) + Mg(sJ --+ (CH,COOJ,Mg(aq) + H,(g)

(C)

2CH,COOH(aq)+ Mg(s) --+ 2CH,COOMg(sJ + H,(gJ

(D)

2CH,COOH(aq) + 2Mg(sJ ---> 12CH,COOJ,Mg! (aqJ -r H,(g)

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[ [)ur111g th~ manur"acrure of erh.::inul by

58

fe.rmenrat1•:-in, the gas evol\'ed (A) (B)

(C) (D)

SS.

(~)

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56.

(A)

bums with a blue flame turnsl1mewatermilky turns potassium di chromate green

(C) (D)

decomposed to carbon converted to ethanol converted to an ester oxidised to carbon dioxide

Chlorofluorocarbons are MAINLY responsible for (A) .(B) (C) (D)

(B)

59.

-NH, group and -COOH group -NH, group and -OH group -OHgroupand -COOHgroup -COOHgroupand C=Cgroup

(A) (B) (C) (D)

60.

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CH 1CH,CH 2CH,CH,CH;J,"?

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Dimer Trimer Polymer Monomer

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Nylon is a macromolecule which is held together by the smne linkage as a protein molecule. What is the name given to this type oflinkage? (A) (B) (C) (D)

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Which ofthe following names refers to the product fanned in the reaction 3n(CH, = CH,)

condensation esterification neutralisation saponification

When ethene reacts with steam the ethene is (A) (B) (C) (D)

57.

relights a glowing splint

The reaction of fats with concentrated ·· aqueous sodium hydroxide is commonly referred to as (A) (B)

\Vh1ch c·-.vo group~