Chemistry CXC Cape UNIT 2 Paper 1 2007 to 2012

(1)

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CARIBBEAN EXAMINATIONS COUNCIL ADVANCED PROFICIENCY EXAMINATION

CHEMISTRY- UNIT 2 Paper 01

90

minutes

( 07 JUNE 2012 (p.m.))

READ THE FOLLOWING INSTRUCTIONS CAREFULLY.

1.

This test consists of

45

items. You will have

90

n1inutes to answer then1.

2. In addition to this test booklet, you should have an answer sheet and a Data Booklet.

3. Each itetn in this test has four suggested answers lettered (A), (B), (C), (D). Read each · e you are about to answer and decide which choice is best.

4. On your answe'r sheet, find the number which corresponds to your item and shade the s. having the san1e letter as the answer you have chosen. Look at the sample item below. Sample Iten1

Which of the following is the

HIGHEST

energy transition in an organic con1pound? (A) (B) . (C) (D) n to a+ n ton:+

a

to

a*

1t ton:* Satnple Answer

The best answer to this iten1 is "a to cr*", so answer space (C) has been shaded. 5. If you want to change your answer, erase it completely and fill in your new choice.

6. When you are told to begin, tum the page and work as quickly and as careful1y as you can ~f you cannot answer an iten1, go on ~o the next one. You n1ay return to this item later. Your sc 1 . will be the total nmnber of correct answers.

7.

8.

9.

You tnay do any rough work in this booklet. Figures are not necessarily drawn to scale.

You n1ay use a silent, non-progranunable calculator to answer iten1s.

(2)

l

-2- I !

1. Which statement is true about C - C bonds?

3.

The compound which shows both ci - rans

isomerism and optical isomerism is ----, I

(A) A double bond is made of a sigma !

bond and a pi bond. H H

(B) There is a higher electron density

"

/

between the atoms in a single (A)

c

H

I

bond than in a double bond.

I

"

I

(C) The distance between the nuclei

c

C - H

of the carbon atoms is shorter

/ I ' \

I

'\

I in single bonds than in double

H

H r H !

bonds.

H

(D)

Single bonds are more reactive

I I

towards most reagents than I

double bonds. Cl Cl

'\

/

_l

(B)

c= c

"

I

Item 2 refers to the following structure.

_c

/

_c

IJ"-

/

--, H

H H

H.

I

I I

H H H

H

H-C-C-C-C-H

I I

I

l

H H

H H H

H-C-H

"

I

(C)

c

I

H-C-H

/

"

I

c

H

_II'-

_/

H

2. The IUPAC name for the structure is Br

(A) 2- ethyl butane

(B) 3 - ethyl butane

H

H . (C) 2 - methyl pentane

"

I

(D)

3 - methyl pentane (D)

c

/

"

c

/j"-H

H

H H GO ON TO THE NEXT PA ~,

(3)

4.

I:,

I:::~

l

5.

l

L

I_

l_

L

l_

L

l_

Volatility of organic compounds depends on the strength of the inten11olecular forces present. Which compound below would be the MOST volatile?

(A) CH₃CH₂CH₂0H (B) CH₃CH₂CH₂CH

3

(C) CH₃CH(CH₃)CH₃

(D)

CH

₃

CH

₂

CH

₂

COOH

In the reaction between ethene and bron1ine, which statements about the reaction mechanism are true?

I. II. III. (A) (B) (C) (D)

A carbocation forn1s in the rate detennining step.

A dative covalent bond forms between the bron1ide ion and the carbocation.

Heterolytic fission of the bromine-bromine bond occurs.

I and II only

I and III only

II and III only

I, II

and

III

6.

7.

Which of the following alcohols will N The

oxidised

by

acidified

potassium

die

mate

(VI)? (A)

~H

1 0H

(B) CH₁0H

I

C H - C - H 3

I

OH

H

I

CH -CH - C - O H 3 1

I

(C) CH 3 (D) CH₃

I

C H - C - OH 3

I

CH 3

The equation for the fom1ation of the a aes-thetic, CF₃CHBrCl, is

Br2 >

CF CHBrCl

₃

The type of reaction occun·ing is

(A)

(B) (C)

(D)

electrophilic substitution free radical substitution nuc.Ieophilic addition nucleophilic substitution

(4)

8.

9.

Ethanol can be fonned by the fo11owing reaction

The mechanism used

is

(A) eJectrophilic addition

(B) nucleophilic addition

(C) electrophilic substitution

(D) nucleophilic substitution

Iten1 9 refers to folJowing diagram of Compound A.

0

nc==cn

2

Compound A

Which statements are cmTect concerning Cmnpound A?

I. It will decolourize aqueous bromine.

II.

It will decolourize cold, acidified potassimn pennanganate.

111. It will produce a silv~r mirror with

(A)

(B)

(C)

(D)

Toll en's reagent.

I and Il only I and 11 I only II and J II only I., II and HI 10. 11. 12.

Which of the following compoun oes NOT give a white precipitate when h ken with cold ethanolic silver nitrate?

(A) (B) (C) (D) Cl CJ I i i I

I

I I I I i

I

Which of the foJJowing would rei proton MOST readily?

I

l

f

a

I

(A) (B) (C)

(D)

CH 3CH20H CH.COOH ·' C"'H50H CH 30H !

Hydrogen cyanide is more likely to ethanal but not to ethene because

i to

I

(A) (B)

(C)

(0) i

ethanal

is

more susceptible

Ito

e)ectrophilic attack than et ~:~i,1e

ethan~

I is more susceptible t tl' jee

rsd1caf attack than ethene 1

ethanal is more susceptib ito

nucleophilic attack than et et~e

the addition product formed '-~th

ethene would be unstable

I

GO ON TO THE NEXT PA ~.

(5)

1;1

::;i~~

..

1\~

l

'.:i

... : .. ~ ·;;:J !'

j·[

13. 14. 15. - 5-Jten1 13 refers to the following structure of tyrosine.

The pH of tyrosine is MOST likely

(A) 2.1

(B) 5.6

(C) 7.0

(D) 9.0

Which of the following is NOT true of addition poly1nerisation?

(A) Only one type of polyn1er is

fon11ed.

(B) The 1nolecular mass of the polymer is a multiple of the monomer unit.

(C) The polymer is readily hydrolysed to the monomer.

(D) The physical and chetnical

properties of the polymer are different fron1 those of the n1onon1er.

The product fanned by the polymerisation of propene, C₃H₆, may be used as a

(A) (B) {C)

(D)

fuel liquid disinfectant plastic material 16. 17 . 18. 19. I

Which of the following may be elimi ~fed by calibrating a measuring instrume t

I

Lack of precision Random en-ors Systematic errors (A) (B) (C)

(D) Random and systematic erro s 1

I

i

I Which of the following is NOT apr ;rty

of a prhnary standard?

i

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

I

Does not undergo hydrolysi 1

Has low relative molecular

's.

Is obtainable in a pure state. Is very soluble in water.

Which of the following will NOT the accuracy of the results in a titri analysis?

(A) Adding excess water to the c flask

(B) Blowing the reagent out pipette tip

(C) Overshooting the calibration of the volun1etric flask

(D) Purity of reagents

A 300 mg solid sample containing ch is dissolved in water. The chloride i

precipitated as AgCl by the additi silver nitrate to the solution of the sa The precipitate is collected, washed, and weighed, and found to have a m 525 mg.

(R.A.M. ofCl = 35.5, Ag = 108)

The mass of

chloride present in the sat

(A) 74.2 mg (B) 118.0 mg (C) 129.9 mg (D) 208.0 mg

i

GO ON TO THF. NEXT PA

fl

i

(6)

20. Which of the following statements about 24.

21.

gravimetric analysis is NOT true?

(A)

(B)

(C)

(D)

Gravimetric analysis is a purely quantitative method.

Gravimetric analysis never involves the removal of volatile components of a solid~

The analyte can be identified after precipitation and isolation have occurred.

The amount of analyte lost due to solvation is assumed to be negligible.

Which of the following analytical tech-niques is considered MOST specific for identification purposes?

(A) Mass spectroscopy

(B)

UV

NIS spectroscopy

(C) Gas chromatography

(D) Thin-layer chromatography

22. Which two features BEST describe ultra-violet radiation? 23. (A) (B) (C)

(D)

Long wavelength and high energy Long wavelength and low

frequency

Short wavelength and high

fi~equency

Shot1 wavelength and low energy

Which ofthe following types of electronic transitions would NOT produce absorption in the

UVNIS

region ofthe spectrum?

(A) (B) (C) (D) s __... p* p-+ p"' n __... p* n-+ s* 25. 26.

Hexane will not absorb light in the U region of the spectrum because ther ;s a

(A)

(B)

(C)

(D)

large difference in energy b the bonding and antib orbitals

large difference in energy b the bonding and non-b orbitals

small difference in energy b

the bonding and non-b orbitals

sma11 difference in energy b

the bonding and antibo orbitals

Which of the following pairs will NOT infrared radiation? I. H:! and Cl₂ II. NH₃and HBr

III.

CH₄and Br₁ (A) I only (B) 11 only

(C) I and III only

(D) II and III only

Which of the following statements ab patiition coefficient may be true?

l. It does not vary with temperat r ;.

I1. The so Jute has to be in the

,1pe

molecular state in both sol e.nts

HI. (A) (B) {C) (D) for it to be a constant.

The two solutions have

be

con centra ted for it to <i' a

constant. I only 11 only J and l1 only I. II and Ill GO ON TO THE NEXT PA

-...,

(7)

27.

l

I

····

.

j 28. 29.

Which of the following is NOT a stationary phase used in chron1atography?

(A) Alumina (B) Cellulose (C) Silica gel (D) Starch

Item 28 refers to the following information.

A student canies out an experiment using thin-layer chron1atography separation on silica gel and obtains the following results:

Compound Distance Travelled

(em)

Compound

A

1.5

CompoundB 9.1

Solvent 12.5

The Rr value of Compound A is (A) 0.07

(B) 0.12

(C) 0.16

(D) 0.73

A solution of 10 g of a carboxylic acid (weak acid) in 1 00 cm3 _{of water is shaken}

with 100 cm3 of ethoxyethane. It is found that only 6.5 g of the acid remains in aqueous solution at equilibrimn. The pa1tition coefficient is (A) 0.054 (B) 0.54 (C) 5.4 (D) 54.0 30. 31. 32.

Which of the following are advant g is of

stean1 distillation?

I

I. It occurs under reduced pre s~re. II. The components do not deco 1~ose.

Ill. It provides savings in fuel

t.

(A) I and II only

(B) I andl Ill only (C) II and III only

(D) I, 11 and III

i

I

Which of the following are important

l~ors

to consider in detennining the locati 1 ?f a

factory?

i

I

I.

Prox~mity.t~

a potential work

o~:ce

II. Availability to a mea s i of

. I

transpm1atwn ,

III. Potential pollution of air, lat · nd water

IV. Proximity to raw materials (A) I, II and III only

(B)

I, II and

IV only (C) I, Ill and IV only

(D) I, II, III and IV

Along with silicon dioxide, which following compounds constitutes the

impurities

of

bauxite?

(A) lron(II) oxide (B) lron(IIJ) oxide (C) Carbon dioxide

(D) Carbon monoxide

(8)

33.

34.

35.

Item 33 refers to the following fractions of crude oil. I.

II.

III.

IV.

Diesel Petrol Refinery gas Kerosene

The correct order in tenns of INCREASING boiJing points is

(A) I, II, Ill, IV (B) III,I,IV,II (C) III, II, IV. I (D) IV, II, I, Ill

Which of the following products is NOT produced for commercial purposes by the e]ectroJysis of concentrated brine?

(A) Chlorine

(B) Oxygen

(C) Hydrogen

(D) Sodium chlorate (V)

In the Bosch-Haber process, N., and H~ can be obtained from X and Y respecti~eJy. Which of the following pairs BEST describes X and Y?

X y

(A) Ammonium salts Naphtha

(B) Ammonium salts Air

(C) Air Naphtha

(D) Air Ammonium salts

36. Which of the following statements does NOT accurateJy describe a result of ethanol

consumption?

(A) Digestion occurs in the stomach. (B) Natural inhibitions are re]axed

(reduced).

(C) Oxidation occurs in the blood. (D) Reaction time is reduced.

37.

38.

39.

40.

In the electrolysis of brine u ing the· diaphragm cell, two by-produc s re (A)

(B)

(C)

(D)

chlorine and oxygen

chlorine and sodium

hydrogen and mercury hydrogen and sodium h

The presence of phosphate ions ( . 4 J-) can

be detected using (A) (B)

(C)

(D) ammonium molybdate potassium hexacyano solution potassium thiocyanate s sodiun1 thiosulphate J 1tion I

l

ate( II) C _{mnpoun s o · su}d f l I _P.1~r sue 1 .as. I s~

II

p 11tes I . are used as food additives. This 1

l

1.ecause

they

I

(A) improve the flavour of ft i

(B) help to enhance the colo ~f food (C) inhibit the oxidation ofun a: trated (D)

fats

help to preserve the dehydration

Which of the following sulphuric acid'?

I. Fet1ilizer

n.

Paint IIJ. Fibre

IV.

Detergent (A) I. II and Ill only

(B) 1, Ill and lV only

(C) II, Ill and JV only

(D)

L

11, JH and JV

GO ON TO THE NEXT P

Cftf.

by

use

(9)

-I

.

'.·

j

_{~ :~~-}

.ii,i·

_~i

J:l,

·:t.f •. t;;:.:·1 ··;o-.:,-•·

1 1t

J

'l'i~t···

-·I

_j · ..

_j

41 . 42. 43.

Which of the following is NOT a green-house gas? (A) (B) (C) (D) Amn1onia Carbon dioxide Methane Water vapour

,

Item 44 refers to the following sch 1 atic diagram.

Nitrogen _., N ~~--:-:R:-:-ai_n

7

a_n_d-tt--;r-, fixation ...-l 2

J

_lightning

Li

Deni trifying bacteria ) Nitrifying bacteria

!X

l

J

Items

42-43 refer to the following

description: Organic f wr..._Decay. N ~~~r 2 4 Plants y I

J

Aerosol propellants such as Freon-11, CC13F, are of 111ajor concern because

of

their photochen1icaJ reaction with ozone,

03• Ultraviolet radiation in the stratosphere

produces chlorine radicals, which th(m react with ozone, producing oxygen. A balanced equation for the photochemical decon1position of Freon-II is

(A} CC1₃F(g) hr ) 2Cl•(g)

+

CCIF•

(B) CC1₃F(g) hr > CCl₃•(g)

+

F•(g)

(C) CC1₃F(g) hf ) Cl•(g)

+

CCl₂F•(g) (D) CC1₃F(g) hr ) 3Cl•(g)

+

CF•(g)

A balanced equation for the production of oxygen from ozone is

(A) (B) (C) (D) 01(g)

+

Cl·(g)---.. O(g)

+

CIO, •(g) O~(g)

+

Cl•(g)---.. CIO•(g)

+

0

7(g)

O~(g)

+

CI-(g) ~ O(g)

+

ClO., :(g)

O~(g)

+

CI-(g)---.. O.,(g)

+

CJO-(g) 44.

45.

compounds

Bacteria ... _~

W would MOST JikeJy be (A) (B) (C)

(D)

nitrates nitrites nitric(V) acid ammonium salts i.i

I

_I Bacteria

Which of the following plastic

~~

re

biodegradable? : _.

(A) Low density polyethene

(B) Polythene terephthalate . 1

(C) Po1y (3 - hydroxybutano1c

ac

dO

(D) Polyvinylchloride

I

_i

END OF TEST

CHECK YOUil WORK ON THIS

TE

~ ~

.

(10)

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(11)

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FORM

TP 2011155

MAY/JUNE 2011

CARIBBEAN EXAMINATIONS COUNCIL

ADVANCED PROFICIENCY EXAMINATION

CHEMISTRY- UNIT 2

Paper 01

90

minutes

( 07 .JUNE 2011 (p.m) )

READ THE FOLLOWING INSTRUCTIONS CAREFULLY. 1. This test consists of 45 items. You will have 90 minutes to answer them.

"

2. In

addition to this test booklet, you should have an answer sheet and a ~ata Booklet.

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

4. On your answer sheet, find the number which corresponds to your item and shade the space

havi~g the same letter as the answer you have chosen. Look at the sample item below.

Sample Item.·

vyllich of the follo~ing is tp.e HIGHEST energy transition in an org::mic compound?

(;A)·

.n to 0'*

(B)

n

to 1t*

(t)

:a

to cr*

CP). .' · ·

1t to 1t*

..

·

.. -... ·Sample Answer

Th~{l;>e,stanswer

to this item is "cr to cr*", so answer space (C) has been shaded.

~ . . .

' .

5. !(you want to change your answer, be sure to erase your old answer completely and fill in your

new choice. ·

6. When you are told to begin, tum the page and work as quickly and as carefully as you can. If you cannot answer an item, omit it and go on to the next one. You can come back to the omitted

item later. Your score will

be the total number of correct answers.

7. You may do a:o.y rough work in this booklet. 8. Figures are ·not necessarily drawn to scale.

9. The use of silent, non-prograrmnl:lble calculators is allowed.

DO N.OT TURN THIS PAGE UNTIL YOU ARE TOLn TO

DO

SO.

Copyright

©

2010

Caribbean

Examinations Council

(12)

1. _{Which statement is true about} carbon-carbon bonds? (A) (B) (C) (D)

A double bond is made of a sigma bond and a pi bond.

There is a higher electron density between the atoms in a single bond than in a double bond. The distance between the nuclei

of the carbon atoms is shorter in single bonds than in double bonds. Single bonds are more reactive toward II\ost reagents than double bonds. ·

2. _{When butan-1-ol is dehydrated}_in_{a suitable} piece of apparatus, the product is

3. (A) (B) (C) (D) butane butene but-1-ene but-2-ene

It _{is true that an electrophile must have} (A) (B) .- (C) ' (D) a positive charge a negative charge a non-bo~~ng electron

. an oxygen or nitrogen atom 4. _{; The c9rrect IUPAC name for the structural}

: formula .·~ . ·: .

(A) _{2, 2, 4-trimethyl pentane} (B) _{2, 2, 4-trimethyl octane} (C) _{2, 4, 4-trimethyl pentane} (D) _{2, 4, :4-trimethyl octane}

5.

6.

In the reaction between the ethene and bromine, which statement(s) about the reaction mechanism may be true?

I. II. III. (A) (B) (C) (D)

A carbocation forms in the rate determining step.

A _{dative covalent bond forms}

between the bromide ion and the carbocation;

I only I and II only II and III only I, II and III

Which of the following compounds is MOST likely to undergo hydrolysis?

(C)

(13)

l

3 -7. Which of the following is a pair of optical isomers?

CH3 CH3

I

l

(A) . CH3-C-OH . HO-C-CH3

I

CH3 CH3 H H

I

(B) C~Hs-C-OH HO-C-C2Hs

I

(~

I

CH3 CH3 H H H H H H H H

I

I I I

I

I I I

(C) H-C-C-C-C-OH HO-C-C-C-C-H

I

I I

I

I I I I

H H H H H H H H CH3H H CH3

I

I I

(D) H-C-C-OH HO-C-C-CH3

I

I I

CH3H H CH3

8. Hydrog~n cyanide adds to ethanal but not to ethene because

(A) .·

·.~thanal

is more susceptible to electrophilic attack than ethene (B' · · :·ethanal is more susceptible to free radical attack than ethene

(C)· .. _.

ethanal is rn:ore susceptible to nucleophilic attack than ethene

CP,)·

·.:··:.:the addition·product formed with ethene would be unstable

.·: .

t o , ' I •

.. ~ .• .

(14)

9.

10.

Item 9 refers to the molecule shown in the following diagram.

0

The above molecule is responsible for the flavour in spearmint bubble gum. Which statements about it are correct?

I.

II. m.

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

It will decolourize bromine.

It will be oxidized by hot aqueous acidified K.MnO ₄•

It will give a positive test with Tollen's reagent.

I and II

only

I

and

III

only

II and III

only I,

Ilandill

·Item 10 refers to the following reaction.

~Br

;The.

pn;>duct of the following reaction is

f.oml.ed

by

(A) free radical substitution

(B) nucleophilic substitution (C) elimination reaction (D) electrophilic substitution 11. 12. 13.

At which of the carbon atoms (indicated

by an arrow and labelled (A), (B), (C) and

(D)) in the molecule below is nucleophilic

attack MOST likely?

H ~0

"c /

CD)

.

A

~CH

3 \CH

2

Br

(C)

~

'--- (A) (B)

The complete reaction of phenol with aqueous bromine is characterised by a (A)

(B)

(C)

(D)

brown precipitate, a brown solution and a sweet smell

brown precipitate, a colourless solution and a sweet smell white precipitate,

a

colourless

solution and an antiseptic smell white precipitate, a brown solution

·and

an antiseptic smell

Which of the following is NOT true about condensation polymerisation?

(A) The molecular mass of the polymer is a multiple of the combined masses of its monomers.

(B) The polymer can be hydrolysed to form its monomers.

(C) Tht? polymer has physical and chemical properties that differ from the monomer units.

(D) Small molecules are eliminated during the condensation process.

(15)

14. Which of the following compounds would 18. Which of the following graphs illustrates

i release a proton MOST readily?

the titration of dilute sulphuric acid with

-·

potassium hydroxide solution?

(A) CH₃CH₂0H

14b:C

(A) (B) C~COOH pH 7 (C) C₆H₅0H

(D) CH₃0H Vol of~

so,.

(B)

14lL

pH

15. A sample of an organic compound with a ₇

mass of 0.816 g w~s completely burned in oxygen and fourid to produce 1.55 g of

carbon. dioxide and 0.955 g of water only. Vol ofH1 S04

The empirical formula of the compound is _(C)

14~

pH (A) C₂

H

₆0 7 (B)

C2H402

(C) CzHz04 Vol of H₂S04 (D) C₄H₈0 (D)

14LC

pH

16.

Which of the following pieces of apparatus 7 possesses the HIGHEST degree of

uncer-tainty in measurement? Volof~S0₄

(A) Burette

_.(B) . Beaker

_19.

Which of the following statements about

(C) .~ Pipette gravimetric analysis is NOT true?

:cP)

'· Measur~g cylinder

. ~ '

(A) Gravimetric analysis is a purely Item 17 refers_ to: the following burette

quantitative method.

(B) Gravimetric analysis never involves

r~ad~g~: the removal of volatile

compo---;.,

;2-5·:1, ':

:25.2, 24.9, 24.8

nents of a solid.

(C) The analyte can be identified after

17. ;The standard deviation of the readings

p:r;ecipitation and isolation have occurred.

above is (D) The amount of analyte lost due to

solvation is assumed to be

negli-(A) 0.10 gible.

(B) 0.13

(C) 0.15

(D) 0.18.

(16)

20. Treatment of a 10.00 g sample containing a chloride salt with excess silver nitrate solution produced 8.08 g of silver chloride. (Ag = 108, Cl = 35.5)

The expression for the percentage of chloride in the sample is

(A) 143.5 X 8.08 X 100 35.5 X 10.00 35.5 X 10.00 X 100 (B) 143.5 X 8.08 : (C) 35.5 X 8.08 X 100 143.5 X 10.00 (D) 143.5 X 1Q.Q0 X 100 35.5 X 8.08

21. Which of the following will NOT affect the accuracy ofthe results in a titrimetric analysis?

(A) Purity of reagents

v-

;>"1.:>

(B) Adding excess water to the conical flask

(C) Blowing the reagent out of the pipette tip

(D) Overshootj.ng the calibration mark of the voll:unetric flask

:'

..

22. · The structural features which cause ::

~~sorj}tion

in the_· UV NIS region of the

· ¢.:t~·c~otnagnetic

_..

spectrum are known as

' .

·:·f

.. (~)· : -cr bonds

1.·03) · cbromophores

:(C) isolated 1t bonds

(D) lone pairs of electrons

23.

24.

25.

Hexane will not absorb light in the UV/visible region of the spectrum because there is

a

(A) large difference in energy between the bonding and antibonding orbitals

(B) large difference in energy between the bonding and non-bonding orbitals

(C) small difference in energy between the bonding and non-bonding orbitals

(D) small difference in energy between the bonding and antibonding orbitals

Which of the following pairs do NOT absorb infrared radiation?

I. ~OandHI

II.

H₂and Cl₂ III. NH₃and HCl

rv.

N₂and Br₂

(A) -I and III only

(B) I and IV only

(C) II and III only

(D) II and IV only

In which of the following processes is infra-red spectroscopy MOST likely used? I. Monitoring atmospheric pollution II. Breath-alcohol analysis

III. Quantitative analysis ~·

(A) I only

(B) II only (C) I and II only (D) I and III only

(17)

l

I ; . ,_._ 26. -7-In the mass spectrometer, a molecular ion is formed from a compound by

(A) (B) (C) (D) loss of a proton gain of an electron loss of

an

electron

fragmentation of the compound

27. Which of the following is NOT a visualising agent in chromatography? (A) (B) (C) (D) Cellulose Iodine Ninhydrin Ultraviolet light

Item 28 refers to the following chromatogram which is obtained when a 1 : 1: 1 : 1 mixture

of ethanol, propan-1-ol, butan-1-ol and hexan-1-ol is analysed by gas-liquid chromatography.

I II

m

IV I Ethanol II Propan -1- ol III Butan -1- ol N Hexan -1-ol 0 5 10

Retention time (min)

28. Which i,ompound is .present in the IDGHEST concentration?

1 i , ' I

(A)'

Ethanol

$): . ·

·Butan-1-ol (C): . Hexan-1-ol ·

(D)'· ·

<" ·_Propan-1-ol .· . . • '·! . • .

(18)

l

I.

I I 8

-Item 29 refers to the following boiling point composition curves for three mixtures ..

c _ _ _ _ _ _ _ _ _ ·

-I

II

III

29. Which of the following CANNOT be completely separated by fractional distillation?

30.

(A) I only

(B) II only

(C) I and II only

(D)

II

and

III

only

Which of the following statements about a partition coefficient may be true?

I.

It does not vary with temperature.

n..

The solute has to be in the same molecular state in both solvents for it to by a constant.

-III.

··The two ·-solutions have to be .: · ·concentrated for

it

to be a constant.

t • • • ~

.

' .. ,{1\). ..

::cfi3).

C¢Y>

CD} . .-:

I only II only I and II only I, II and :Q:I

31. \Vhich of the following are important factors to consider in determining the

location of a factory? L II.

III.

Iv. (A) (B) (C) (D)

Proximity to raw materials Proximity to a potential workforce Potential pollution of air, land and

water

Availability to a means of transpor-tation

I, II and III only I, II and IV only I, III and IV only I, II, III and IV

,•

32. When extracting aluminium from its

bauxite ore, the bauxite is

(A) electrolysed

(B) heated with carbon

(C) dissolved in molten cryolite to reduce the melting point

(D) dissolved in molten cryolite to reduce electricity costs

(19)

l

I I. i 33. 34. 35.

-

9-Which of the following is represented by C1- C4 hydrocarbons? (A) (B) (C) (D) Kerosene Diesel oil Gasoline Refinery gas

Item 34 refers to the following fractions of crude oil. I.

IT.

III. IV Diesel Petrol Refinery gas Kerosene

The correct order in terms of increasing

boiling point is

(A)

I, II, Ill, IV

(B) Ill, I, IT, IV

(C)

III, II, I, IV

(D) III, II, IV, I

The essential ~onditions for the Haber process are

(A)

?-

Atm pressure, 400

oc,

iron catalyst (~);.

· 2

Atm pressure, 450

oc,

no catalyst

Cfl. .

f'OO Atm pr~ssure, 450 °C, iron

. . . ::catalyst

(Dji . : .. 200 Atm pressure, 1000

oc,

no .(. · ·. _: -~atalyst

36. In the production of sulphuric acid by the contact process the following exothermic

37.

38.

· reaction takes place:

Which of the following conditions would favour the forward reaction?

I.

IT.

III. (A) (B) (C) (D) Low pressure Excess oxygen Low temperature I only I and II only II and III only I, II and III

Item 37 refers to the manufacture of chlorine by the electrolysis of brine using the diaphragm cell.

The anode is made up of

(A) steel

(B) graphite

(C) platinum with a coating of asbestos (D) titanium wi~h an inert coating of

ruthenium (IV) oxide

For which TWO of the following industrial products is chlorine MOST widely used in their manufacture?

I. Solvents

II. Sodium chloride

III. Poly'Viny !chloride

IV. Chlorofluorocarbons

(A) I and II only

(B) I and III only (C)

II

and

III

only

(20)

39.

40.

41.

Which of the following industries use sulphuric acid?

I. Fertilizer II. Paint IIi. Fibre IV. Detergent (A) I, II and III only (B) I, III and IV only (C) II, III and IV only (D) I, II, III and IV

Which of the following is a disadvantage of using chlorine for water purification? (A) Chlorine promotes eutrophication. (B) Chlorine contributes to the

depletion of the ozone layer. (C) Toxic chlorinated hydrocarbons

may be formed.

(D) Toxic chlorine gas may threaten nearby homes.

Which of the following ions are significant contributors to eutrophication? . I.

PCP-

₄

.

''·.

. Iv.· ..

CI-··:

·

. . . . · ...

. .. (A).· .. I

and

II

only

; :. (B) ·: '

I and Ill only ... (C) I, II and III only

. (D) I, II, III and IV

42. Which of the following compounds is NOT a primary pollutant?

(A) Carbon monoxide (B) Nitrogen dioxide (C) Nitrogen monoxide (D). Sulphur dioxide 43. 44. 45 .

When chlorofluorocarbons are ilnpacted by ultraviolet radiation, chlorine radicals are formed in preference to fluorine radicals. This occurs in the upper atmosphere because

(A) the chlorine radical is more reactive than the fluorine radical

,(B) the fluorine radical is more reactive than the chlorine radical

(C) the bond enthalpy of the C - Cl bond (340 kJ mol-1

) is less than that of the C - F bond ( 484 kJ

mol-1)

(D) the bond enthalpy of the C - Cl bond corresponds to the energy of the ultraviolet radiation

Which of the following may be a result of light-induced reaction of pollutants in the air?

I. Global warming

II.

Photochemical smog III. Greenhouse effect (A) (B) (C) (D) I only II only I and III only I, II and III

Which of the following plastics are biodegradable? (A) (B) (C) (D) Polythene terephthalate Low density polyethene P-oly (3 - hydroxybutanoic acid) Polyvinylchloride

(21)

1.

2.

Which of the following pairs of formulae is

true for butanoic acid?

Molecuhnr EmpJirical lFon·nu.nla Formula (A)

_C4Hs02

CH20

(B)

_C4H60z

CH

₂0

(C)

C4Hs02

. C

₂

H₄0

(D)

C

₄

H

₈

0

C₂H₄0

Cotnbustion analysis of 0.18 g of an organic cmnpound produces 0.396 g of carbon dioxide · and 0.216 g of water. The empirical formula of the compound, given that it contains carbon, hydrogen and oxygen only, is (A) _CzHs04 (B)

C

₃H₈

0

(C)

C

₄

H

₈

0

(D) _C6Hl60z ·,w·· 3. (A) (B) (C) (D)

The compo_und which shows both cis-trans

isomerism

and

optical isomerism is

H H

""

c

/

H

/

""

/

c

C - H

/j"'-

/

" "

H

H Br H H Cl Cl

"

/

c

/

"

c

C - H

/ I "

/

"

H

H Cl

.

H

H H

""

c

/

""

c

c -

H

/I"-

/

_"

H

H Br H

.,

H

/

c

/

"

c

C - H

/I"-

/

"

H

H H H

(22)

4. _{When propane reacts with CI}

2 (g) in the

presence of sunlight, two possible mono-substituted products, 1-chloropropane and 2-chloropropane are formed. What is the ratio of 1-chloropropane to 2-chloropropa.ne? (A) (B) (C)

(D)

1:2

1:3

2:1 3: 1

5. The formula, C

₆

~

₅

COOH. indicates that

6.

(A)

(B)

(C)

(D)

an acid group is present the componnd is ketone

the cotnpound is derived from hexane seven carbon atoms are arranged in

a

chain

In the reaction between ethene and bromine, which statements about the reaction mechanism may be ttue?

I. A carbocation fonns in the rate detennining step.

II. A dative covalent bond forms between the bromide ion and .ethene.

III.

(A) I only

(B) land II only (C) II and

III

only

(D) I, II and III

1'1tf··

7.

8.

· The equation for the formation of the anaesthetic, CF

3CHBrCI. is

CF CH Cl Brz --j. .CF

3CHBrCI. ·3 2

The type of reaction occurring is

(A) electrophilic substitution

(B) free radical substitution

(C) nucleophilic addition (D) nucleophilic substitution

Ethanol can be formed by the following reaction:

The mechanism used is

(A) (B) (C) (D) electrophilic addition nucleophilic addition electrophilic substitution nucleophilic substitution

(23)

9. 2-hydroxy- 2 -tnethylpropanoic acid c~m befonned from propanone in the two steps, illustrated below. 10. CH₃ J CH₃-C-C=N

. I ..

St~ep X

>

OH StepY

>

CH3 O

I ·

4 CH₃

- c - c

I

"'

OH . OH

Which of the following statements about these steps may be true? L Step X involves nucleophilic addition.

II. Aqueous potassium cyanide is the reagent in Step X.

III. Step Y involves hydrolysis. (A) !only

(B) I and II only (C) II and III only

(D) I, II and III

Which of the following compounds will NOT decolotnizebromine water but will decoloUlize potassium manganate(Vll) on wanning? (A) Butane

(B) EU1a.nol

(C) Ethene

(D) Ethanoic acid

11.

A compound, X, reacts with I.

II.

III.

2, 4-dinitrophenylhydrazine (DNPH) to give an orange precipitate Fehling's solution to give a red

precipitate

aqueous alkaline iodine to give yellow crystals

Compound X is MOST likely

(A)

(B)

(C)

(D) CH2COCH3

(24)

12.

Ite1n 1Z refers to the following reaction.

c&Br

The product of the following reaction is fonnedby

(A) an elimination reaction (B) electrophilic substitution (C) free radical substitution (D) nucleophilic substitution

13.

hem

13

refers to the following structure of tyrosine.

co

₂

n:

I

.iHlzN-~-- JHi ClHI:z

¢

Olffi

The pH of tyrosine is MOST likely

(A) 2.1

(B) 5.6

(C) 7.0 (D) 9.0

Jl4. Which of the following is NOT true of addition polymerisation?

(A) Only one type of polymer is formed.

(B) The molecular mass of the polymer is a multiple of the monomer unit. (C) The polymer is readily hydrolysed to the monomer.

(D) The physical and chemical properties of the polymer are different from those of the monomer.

15. Which of the following is t:J.ue for starch and glucose?

Sta.:rd11 ""!t:r..a., Ghncos~

(A) High solubility in water High solubility in water

(B) Low solubility in water Low solubility in water

(C) Gives blue/black colour with iodine Gives blue/black colour with iodine

(D) No reaction with Fehling's solution Reduces Cu2+

in

Fehling's solution to red/brown CuzO

h·

(25)

16.

17.

13.

19.

Which of the following sets of titration readings is the MOST precise?

(A) 25.1 25.5 25.1 25.2

(B) 24.9 24.5 25.2 25.4

(C)

25.0 25.0 24.9 24.8

(D)

25.0 24.5 24.8 24.6

Which of the following is NOTa property of

a

primary standard?

(A)

(B)

(C)

(D)

Does not undergo hydrolysis Low relative molecular mass Obtainable in a pure state Very soluble in water

What is the concentration (tnol dm-3) of an aqueous solution that contains 63.3g of K₃Fe(CN)₆in 1.0 dm3 _{of solution? [The}

relative formula mass ofiSFe(CN)5 is 329.2.]

(A) 1.92 x 1

o-

1

(B) 2.95 X 1()4

(C) 3.11 X l0-3

(D) 5.77 X lo-1

Naturally occurring Element X has four isotopes: 50X, 52_:X,53_{X and}54_{X. They}_hav~

percentage abundance of4.31, 83.76, 9.55/·· and 2.38 respectively.

What is the relative atomic tnass of X? (A) 52.00 (JB) 52.06 (C) 52.25

(D)

53.00

20. 21. 22.

Treatment of a 10.00 g sample containing a chloride salt with ex:cess silver nitrate sol uti on produces 8.08 g of silver chloride.

(Ag= 108, Cl = 35.5)

The expression for the percentage of chloride in the sample is (A) (B) (C) (D) 35.5Xl0.00 xlOO 108X8.08 35.5x8.08 x ₁₀₀ 108><10.00 35.5xlO.OO xlOO 143.5x8.08 35.5x8.08 ><lOO 143.5xl0.00

A compound absorbs light of frequency 940 MHz. The wavelength. in em. of the light absorbed is (c = 3.0 x 108m s·1)

(A) 31.91

(B) 31.91 X lQ-2

(C) 31.91 X lo-1

(D) 31.91 X 1()"

Which two fean.u·es BEST describe ultraviolet

radiation?

(A)

(B)

(C) (D)

Long wavelength and high energy Long wavelength and low frequency Short wavelength and hlgh frequency Short wavelength and low energy

(26)

23. vVhich of the following alkenes has the wavelength of maxim tun absorption,

A.

max ? 24. 25. 26.

(A)o

(B)o~ ~·

/}

(C)o

(D)o

Which ofthe following equations goven1s the determination of an unknown compound, X,

in a solution by UV NIS spectroscopy? (A) (B) (C)

(D)

log₁₀(I/1) = E c L 1 ogiO (IIlo) = E c L log10 (!0/I)

=

E L [X] 1 og₁₀(I/1 0) = E L [X]

Which of the following pairs do NOT absorb infrared radiation?

I. H₂0 and HI

II. H₂and Cl₂

III.

Nl-1₃and HB r IV. CH₄and Br₂

(A) I and III only

(B) I and IV only (C) II and III only

(D) II and IV only

Which of the following species is NOT

a·,,.~

significant fragment from the mass spectrum of ethanol? (A) (B) (C)

(D)

C 2H50H+ CzHs+ CH 3+ OH+ 27. 28.

Which of the following is NOT a stationary phase used in chromatography?

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

Alumina

Cellulose Silica gel Starch

Item 28 refers to the following information.

Sample X is a mixture of substances. X was separated into its components using paper chromatography simultaneously with individual samples of e, f, g and h. The chromatograph produced is shown below.

Sample X

e

f

g

h

Which substances are MOST likely present

in Sample X?

(A) e, f, g

(B) e,f, h (C) e,g,h

(27)

29.

3({).

A solution of 10 g of a carboxylic acid (weak

acid) in J 00 cxn3 of water is shaken with

100 cm3 _of_{ethoxyethane.}_Itis found thaton.ly

6.5 g of the acid remains in aqueous solution

at equilibrium. The pattition coefficient is

(A) 0.054 (B) 0.54

(C) 5.4

(D) 54

!tern 30 refers to the following apparatus used in organic preparations.

For which of the following is the apparatus

NOT suitable?

(A) Conyersion of phenylamine to

31. Which of the follownng are important factors

to consider in detennining the location of a

factory?

I. Prmdmity to a potential workforce II. Availability to a xneans of

transportation

HI.

Potential pollution of air, land and

water

IV. Proximity to raw materials

(A)

(B)

(C)

(D)

I, II and III only I, II and IV only

I, III and IV only I, II, III and IV

32. The extraction of aluminiuxn involves the electrolysis

of

purified bauxite dissolved in

molten cryolite, Na₃AIF₆. The MAIN

purpose of the cryolite is to

(A)

(B) (C)

(D)

prevent the oxidation of the anodes increase the electrical conductivity of

the melt

reduce the: Inelting point ... of the mixture

prevent the reoxidation of the · alwniniurn formed at the cathode

bew...enediazonium chloride 33. In the fractional distillation of crude

oil, the different fractions are separated based on

their (B)

(C)

(D)

Conversion of butan .._, 1 - ol to 1 -bromobutane

Oxidation of propan - 2 - ol to-" propanone

0Jlidation of methanol to methanoic

acid

(A) polarity

(B) volatility

(C) viscosity (D) solubility

34. Penn entation of sugars to alcohol is controlled by a sexies of enzytnes collectively known as

(A) amylase

(B) lipase

(C) sucrase (D) zymase

(28)

35.

36.

37.

In the Bosch-Haber process, N₂and H₂can be obtained from X andY respectively. Which of lhe: following pairs BEST describes these sources? X

y

(A) Ammonium salts Naphtha (B) Ammonium Air salts (C) Air Naphtha (D) Air Ammonium salts

Which of the following ate consequences of the consmnption of alcohol?

I. II. III. (A) (B) (C) (D)

Depresses the central nervous system

May cause liver disease Reduces manual dexterity

I and II only I and III only

II and III only I, II and III

In the electrolysis of brine using the diaphragm cell, two by-products are

(A) chlorine and oxygen (B) chlorine and sodimn (C) hydrogen and mercury

(D) hydrogen and sodiwn hydroxide

38. Chlorine is the active component for swimming pool disinfectants, although it is a

poisonous gas. Which salt below is used as a safe chlorine source?

(A) HClO (B) CaCI₂ (C) NaClO

(D) NaC10₃

39. V\fhich of the following industries use sulphuric acid? 40. I. II. III. IV. (A) (B) (C)

(D)

· Fettilizer Paint Fibre

Detergent-I, II and III only I, III and IV only II, III and IV only I, II, III and IV

The biological oxygen demand (BOD) of water measures the amount of oxygen

(A)

(B)

(C)

(D)

present in a fKxed volume of water produced by aquatic plants in

photosynthesis

needed by microorganisms as they decompose organic matter

used by aquatic organisms during respiration

(29)

4JL

42.

The presence of phosphate ions (PO/-) can be detected using (A) (B)

(C)

(D)

arrunoniwn molybdate sodiwn th.iosulphate

potassium thiocyanate solution potassium hexacyarioferrate(Il)

solution

. Chlorofluorocarbons undergo homolytic fission by being exposed to ultraviolet light in the stratosphere.

Which radical could result from CI-IzFCF2Cl?

(A) (B) (C)

(D)

"CH₂CF₂Cl CH₂F"CF₂ "CHFCF2Cl CH₂F"CFCI

43. Which of the following statements on environmental effects is true?

(A)

(B)

(C)

(D)

Greenhouse effect leads to global wanning.

Global warming leads to greenhouse effect.

Photochemical smog leads to global warming.

Eutrophication leads to greenhouse

effect. ·

44.

45.

Item 44 refers to the schematic diagram below.

Nitro~ Rain and

,_~fi,_x-a~tion ~ lightning Denitrizying •

j

bacteria Nitrifying bacteria Organic N2 compounds ~ Plants Bacteria

z

Bacteria

W would MOST likely be

(A)

nitrates

(B) nitrites

(C) nitric(V) aci.d

(D) · ammonium salts

The burning of polyvinylchloride, PVC, is considered an improper disposal tedmique because PVC

(A) forms toxic products (B) causes acid rain

(C) destroys the ozone layer (D) has a very high melting point

IFYOUF!NJI§lt-IBEJl.iORET!MEISCALLED,CHECJKYOUl-tWORJI'ONTillS'IEST.,

(30)

--

·-.I

-

iiiiiii

=

-

""""'"Z' ~

-iii.iii

-TESTCODE02212010

FORMTP2009158

1vfA Y/JUNE2009

CARIBBEAN EXAMINATIONS

COUNCIL

ADVANCED PROFICIENCYExAM1:NATION CHEMISTRY- UNIT 2 PaperOl

..

90minutes

(o9 JUNE 2009

(p.m.D

READ TBE FOLLOWING INSTRUCTIONS CAREFULLY.

1. This test consists of45 items. You will have 90minutesto answerthem.

. 2. In addition to this test booklet, you should have an answer sheet.

3. Do not l;>e concerned that the answer sheetprovides spaces formore answers than there are items

in this test.

4. Eachiteminthiste:Stbasfoursuggestedanswerslettered(A),(B);(C),{D). Readeachitemyou

are about to answer and decide which choice is best. ·

5. On your answer sheet, find thenumberwhichcorrespondsto your item andsb.aciethe spacehavmg

the same letter as the answer you hav~ chosen. Look at the sample item below.

Sample Item

Wbichofthe following is the HIGHEST energy transition in an organic compound?

(A) (B) (C) (D) n to cr* n to 1t* cr to cr* 1t to 1t* Sa.mpleAnswer

@®G@

The best answer to this item is "cr to cr*", s6 answer space (C) has been shaded.

6. If you want to change your answer erase it completely before you fill in your new choice. 7. When you are told to begin, turn the page and work as quickly and as carefully as you can. If you

cannot answer an item, omit it and go on to the next one. Your score will be the total number of correct answers.

8. You may do any rough work in this booklet

9. Figures_ are not necessarily dra \ltn to scale.

10. The use ofnon-programmable calculators is allowed.

DO NOT TURN THIS PAGE UNTIL YOU ARE TOLD TO DO SO.

(31)

1.

2.

3.

Volatility of organic compo11nds depends on the strength of the intennolecular forces

present Which compound below would be the MOST volatile?

(A) CH₃CH₂C~OH

(B) C~CH₂CH₂C~

(C) CP~CH(CH₃)CH₃

(D) CH3CH2C:t~COOH

Combustion analysis ofO.l S g of an organic

compound produces 0396

g

of carbon dioxide

and0.216 gofwater. The empirical formula

of the compound, given

tb.S.t

it contains

carboil, hydrogen and oxygen only, is

(A) C₃H₈0

(B) C

4H10

(C) C₂H₁0₄

(D) ~6HI60l

The couect IUPAC name for the structural

formwa H CH3 CH3

I

H-C-CCH2CHCH3 is

I

H CH3

(A) -~ 2, 4-trimethyl pentane

(B) 2, 2, 4-trim.ethyl octane

(C) 2, 4, 4-trimethyl pentane

(D) 2, 4, 4-trimetbyl octane

4. Which of the following compounds show optical activity?

I. ~CH(OH) COOH

II. HOCH = CHOH .

m.

~CH (CI) c~

N. HC(Br)ICl .

(A) I and II only

(B) I and N only (C) ll and

m

only (D) .illandlVonly. . 02212010/CAPE2009 5.

6.

7.

A motorist suspects that his gasoline is

contaminated \vith ethanol. Which reagent

can the motorist use to detect the presence

of ethanol?

(A) Br₂(aq)

(B) ~(aq)

(C) NaOH (aq)

(D) KMnO ₄(acidified)

In the reaction between the ethene and

bromine, which statements about the reaction

mechanism. may be true?

L A carbocation forms in the rate

detmnining step.

IT. A dative covalent bond forms

between the bromi~ ion and the

carbocati.on.

m.

Heterolytic fission of tb«~

bromine-bromine bond occurs.

(A) Ionly

(B) I and ll only

(C) !Iandillonly

(D) I, II and ill

Which of the following does NOT descnbe a

nucleophile?

(A) Lewis acid

(B) Lewis base

(C) Species with a lone pair

(D) Reagent which attacks electron

deficient sites in molecules. ·

(32)

8. 2-hydroxy- 2 - methylpropanoic acid can be formed from p~opanone in two steps, illustrated below. 9. CH3

I

CH₃-C-C:::N

I

Step Y ). OH

Which of the following statements about these steps may be true?

I. Step X involves nucleophilic addition.

IT. Aqueous potassium cyanide is the reagent in Step X. ill. Step Y involves hydrolysis.

(A) Ionly

(B) I and II only (C) ITandillonly (D) I, II and m

Item 9 refers to the following reaction.

Reagent

>

Br The reagent in the above reaction is (A) Br₂I sunlight

(B) Br₂I FeBr₃

(C) Concentrated ~S0₄I cone. HN0₃

(D) Concentrated HCl/ Sn

10.

Item 10 refers to the following reaction.

The product of the following reaction is

formed by

(A) free radical substitution (B) mtCleophilic substitution

(C) an elimination reaction (I)) electrophilic substitution

11. Which of the following compounds is the strongest acid?

GO ONTO THE NEXT PAGE 02212010/CAPE2009

(33)

12. \Vbich of the following options is correct for the conjugative, positive inductive and negative

inductive effect, shown by the structures below?

13. OH

t

_Q

@

lo~L

70

R

I

H - C--7-0

I

H

(A) Negative inductive Positive inductive Conjugative

effect effect effect ·

(B) Conjugative Negative inductive Positive induct:i:ve

--effect effect

(C) Negative :inductive Conjugative

effect effect

(D)· Positive inductive Conjugative

effect effect

'Which of the following is NOT 1rue about

condensation polymerisation?

(A) Themolecularmas8 ofthepolymer

is a multiple oftb.e combined. masses

of its monomers.

(B) The polymer can be hydrolysed to

form

its

monome.r:s.

(C) The polymer has physical and

chemical properties that differ from

the monomer units.

(D) Small molecules are eliminated

during the condensation process.

14. effect Positive inductive I effect Negative inductive effect

The repeating unit obtained from the addi:tion

polymerisation of the mono~

CHCl

=

CHCl is H H H H

I

(A) -

c - c -

c -

c

-I

I

c1

a

a ·

H . H

I

(B)

e e

-l

I

CI Cl Cl H

I

(C)

e e

-l

I

Cl H Cl H Cl H

I

(D)

c c c c

-1 I I I Cl H Cl H

GO ON TO THE NEXT PAGE

(34)

16.

17.

18.

15. ·Which of the following is true for glucose and starch?

Starch Glucose

(A) High solubility in water High solubility in water

(B) Low soh~bility in water Low solubility in water

(C) Gives blue/black colour with iodine Gives blue/black colour with iodine

(D) No reaction with Fehling's solution Reduces Cu2₊_in_{Fehling's solution}

Which of the following pieces of apparatus possesses the HIGHEST degree of uncertainty in measurement?

(A) Burette

(B) Beaker

(q

Pipette

(D) Measuring cylinder

Which of the following is NOT an instrument used in titrimen-y?

(A) Barometer

(B) Thermometer (C) Potentiometer

(D) Conductivitymeter

The concentration of an ammonia solution is determined by titrating 25.0 cm3 _ag3.inst

0.2 J?Ol dm-3 _{sulphuric acid to give an end}

point of27 .5 cm3 •

The concentration of ammonia ("mmol dm:l)

is given by (A) (B) (C) (D) 0.2x 27.5 25 0.2x27.5 2x25 2x0.2x27.5 25

2x 0.2x 25

27.5 19. 20. to red/brown Cu20

Which of the following statements about gravin;letric analysis is NOT 1rue?

(A) ·Gravime~c analysis is a purely quantitative method.

(B) Gravimetric analysis never involves

therernovalofvohrtilecornpon~

ofasolid. .

(C) The analyte can be identified after

precipitation and isolation have occurred.

(D) The amount of analyte lost due to solvation is assumed to be negligible.

Treatment of a 10.00 g sample containing a chloride salt with excess silver nitrate solution produced 8.08 g of SI1ver chloride.

(Ag= 108, Cl=35.5)

The expression for the percentage of chloride

in the sample is (A) 143.5x8.08 xlOO 35.5xl0.00 (B) 35.5xl0.00 xlOO 143.5x8.08 (C) 35.5x 8.08 xlOO 143.5 X 10.00 (D) 143.5 X 10.QQ xlOO 35.5x 8.08

GO ON TO TID~ NEXT PAGE 02212010/CAPE2009

(35)

21. \Vhich of the followingutilizesvibrations?

(A) Radio wave

(B) Infrared

(C) UVNIS

(D) X-ray

22. The structural feature·s which cause

absorption in the UVNIS region of the

electroma~etic spectrum are known as

23.

(A) crbonds

(B) chromoph(!res (C) isolated 1t bonds

(D)- lone pairs of electrons

The co~lex ion [FeSCN)2+ has a molar

absorptivity (E) of7.0 x 103 (im3 mol-1 cm-1•

. The concentration of its solution, which gives

an abso:Fbance of 4.2 when measured in a

2cmcell,~

(A) 3 X 1

o-J

mol dm-3

(B) 6

x

1 Q-3 mol dm.-3

(C) 3

x

1 0-4mol dm-3

25. W'nich of the following species is NOT a·

significant fragment from 1he mass spectrum

of ethanol? ·

26. In them_ass spectrometer a molecular ion is

formed from a comp~und by

27.

(A) "loss of a proton

(B) gain of~ electron

(C) loss of an electron

(D) fragmentation of the compound

Which oftbe following is NOT a visualising

agent in chrO'matography? (A) Iocline. (B) Cellulose (C) N"mhydrin (D) t.ntraviolet light (D) 6 x 1 0-" mol dm"3

. 28. Which of the following is LEAST commonly

used as a stationary phase in

chroma-tography?

24. In an

IR

spectrum, an absorption at

3400 cm-1 _corresponds_to_{an -OH group}in

a .molecule. (lJ.L m

=

l~m)

The wavelength corresponding to this absorption is (A) 0.294 p.m (B) 2.94 J.liD. (C) 29.4 Jlill (D) 294 J.llD 02212010/CAPE2009 29. (A) Starch (B) Alumina (C) Silie;a gel (D) Cellulose

Which of the following are advantages of

steam disti11.a1ion?

I. It occurs under reduced pressure.

II. The components do not decompose.

ill. It provides savings in fuel cost.

(A) I and ll

only-(B) I and ill only .

(C) II and ill only

(D) I,ll and ill

(36)

I

\

30. Which of the following statements about

partition coefficient may be true?

I. It does not vary with temperature.

II. The solute has to be in the same

molecular state in both solvents for

it to be a constant.

m.

The .·two solutions have to be

concentrated for it to be a constant. (A) !only (B) II only (C) I andll only (D) I, II and ill

31. Which of the following influence location of

an industrial plant?

I. Proximity to housing schemes

n.

Proximity to port

m.

Goodr~adnetwork

. IV. _Goodelectricity supply

(A) Iandllonly

.(B) !IandiDonly

(C) II, ill and IV only (D) I, II,

m

and IV

32. Along With silicon dioxide, which of the

following compounds constitutes the main impurities of bauxite?

(A) Iron(II) oxide

(B) Iron(lli) oxide (C)

.

Carbon dioxide (D) Carbon monoxide 02212010/CAPE2009 33. 34. 35. 36.

'Which of the following is represented by

cl-

c4

hydrocarbons?

(A) Kerosine

(B) Dieseloi1

(C) Gasoline

(D) Re:finezy gas

The nitrogen used in the manufacture of

ammonia by the Haber Process is obtained

from

(A) fertilizers

(B) the nitrogen cycle

(C) fractional dist:iJ.lation ofliquid air

(D) fractional distillation of crude oil

Which of ~e following is NOT ne:essary for wine making?

(A) Yeast

(B) Oxygen

(C) Enzyme

(D) Carbohydrate

Which ofth.e following are consequences of

the consumption of alcohol?

I. Stimulates the central nervous

system

IT. May cause liver disease

ill~ Reduces manual dexterity

(A) I and IT only

(B) I.andillonly

(C)

rr

and ill only

(D) I, II and ill

(37)

Item 3 7 refers to the manufacture of chlorine 40. The biological oxygen demand (BOD)

of

by the electrolysis of brine using the water measures the amount of oxygen

diaphragm cell.

(A) present in a fixed volume of water

37. The anode is made up of (B) used by aquatic organisms during

respiration

(A) steel (C) needed by microorganisms as they

(B) graphite decompose organic matter

(C) platinum with a coating of asbestos (D) produced by aquatic plants in

(D)· titanium with an inert coating of photosynthesis

ruthenium (IV) oxide

41. Which o~tb.e following ions are significant

38. For the manufacture of which TWO of the contributors to eutrophication?

following industrial products is chlorine

MOS~widelyused? I.

PO/-I. Solventl II.

No;

II. Sodium chloride

m.

Polyvinylchloride

m.

SOl-rv.

Cblorofl.uorocaxbons

IV.

a-(A) land II

(B)

land

ill (A) Iandllonly

(C) Tiandill (B) Iandillonly

(D) llandiV (C) I, nand

m

only

(D) I, II,

m

and IV

39. "Which of the following industries use

sulphuric acid? 42. A reduction in the ozone layer is believed to

have been caused by the action of I. F

ert:i1fzers

II. Paint (A) sulphur dioxide

m.

Fibres (B) CFCs

rv.

Detergents (C) methane

(D) carbon dioxide

(~ I, II and

m

only

{B) I, ill and IV only

(C) II,

m

and IV only

(D) I,II,illandN

GO ONTOTHENEXTPAGE

(38)

43.

/

j '

f

Which of the following statements on environmental effects is true? ·

(A) Greehouse effect leads to global war.tniD.g.

(B) Global

warmmg

leads to greenhouse

~ffect.

(C) - Pbtotochemical smog leads to global warming.

(D) Eutrophication leads to greenhouse

effect.

44. Nitrogen monoxide, NO, is respoilSlble for the destruction of ozone in the stratosphere. How

can NO be generated in the atmosphere?

I.

n.

III. (A) (B) -(C) (D)

Combustion of fossil fuels Lightning discharge

Reduction ofN0₂by S0₂,, both of

which are present in the a1mosphere

landllonly Iandllionly

IIandillonly

L

IIandiD

45. Which of the following plastics are

biodegradable?

(A) Polythene terephthalate (B) Low density polyethene (C) Poly (3 - hydroxybutanoic acid)

(D) Polyvinylchloride

lFYOUFINISHBEFORETIMEIS.CALLED,CHECKYOiJRWORKONTIDSTEST.

(39)

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22212010

disqualificadon. . · · : ' . . .

FORM

TP2008168

MAY/JUNE2008

CARIBBEAN EXAMINATIONS COUNCIL ADV ANCEDPROFICIENCYEXAMINATION

CHEMISTRY- UNIT2

PaperOl

90minutes

( 15JULY2008(a.m.) )

READ THE FOLLOWING INSTRUCTIONS CAREFULLY.

1. This test consists of 45 items. You will have 90 minutes to answer them. 2. In addition to this test booklet, you should have an answer sheet.

3. Do not be concerned that the answer sheet provides spaces for more answers than there are items in this test.

4. Each item in this test has four suggested answers lettered{A), (B),

{q,

(D). Read each item you are about to answer and decide which choice is best.

5.

On your answer sheet, find the number which corresponds to your item and shade the space having the same letter as the answer you have chosen. Look at the sample item below.

Sample Item WhichofthefollowingistheHIGHESTenergytransitioninanorganiccompound? (A) (B) (C) (D) n to a* n to 1t* cr to 0'* 1t to 1t* Sample Answer

The best answer to this item is

"a

to cr*", so answer space (C) has been shaded. 6. If you want to change your answer, erase it completely and fill in your new choice . 7.

8.

9.

10.

Whenyouaretold to be~ twn the page and work as quickly and as carefully as you can. If you cannot answeranitem,omititandgoontothenextone. Yourscorewillbethetotalnumberofcorrectanswers. You may do any rough work in this booklet.

Figures are not necessarily drawn to scale.

The

use ofnon-progranunable calculators is allowed.

DO NOT TURN TffiS PAGE UNTIL YOU ARE TOLD TO DO SO.

22212010/CAPE2008