2007-cECHEMPAPER 2 HONG

HONG

GHEMISTRY PAPER 2 (MULTIPLE-CHOICE)

11.00 am - 12.00 noon (1 hour)

Subject Code 160

l. Read carefully the instructions on the Answer Sheet. Stick a barcode label and insert the informationrequired in the spaces provided.

When told to open this book, you should check that all the questions are there. Look for the words .END

OF PAPER' after the last question.

All questions carry equal marks.

ANSWER ALL QUESTIONS. You should mark all your answers on the Answer Sheet.

You should mark only ONE answer for each question. If you mark more than one answer, you will receiveNO MARKS for that question.

No marks will be deducted for wrong answers.

KONG EXAMINATIONS

KONG CERTIFICATE OF

AND ASSESSMENT AUTHORITY

EDUCATION EXAMINATION 2OO7

2 .

3 .

4 .

5 .

6 .

@6666 ff i4;rt&#t .H IRW ffF{HHong Kong Examinations and AssessmentAuthorityAll Rights Reserved 2007

2007-cE-cHEM 2-l I

Not to be taken away before theend of the examination session

This paper consists of two sections. There are 30 questions in Section A and 20 questions in

Section B.

Choose the best answer for each question.

Candidates may refer to the Periodic Table printed on page 16 when answering the questions.

Section A

{ Which of the following pairs of aqueous solutions can be distinguished b1' usine dilute/ 1'rydrochloric acid ?

/ Al/ zinc iodide and zinc bromide€. silver nitrate and magnesium sulphate

CDA potassium hydroxide and sodium hydroxide

D.* sodium carbonate and calcium hydrogencarbonate

: Which of the following substances has a sharp boiling point ?

A. petrol

/ B.-r- red wineV C. molten wax

.ffi liquid ammonia

: X is an element in the Periodic Table and X* ion has an electronic arrangement of 2, 8, 8.

Which of the following statements concerning X is correct ?

1 A. X is a halogenAJ B. X is a transition elementA

C . X i s a g r o u p 0 e l e m e n t .

O . X i s a p e r i o d 4 e l e m e n t . 2 7 ' t

Which of the following statements concerning members of a homologous series is correct ?

N- The members have the same molecular formula.

f b BA The relative molecular mass of each successive member differs by 14.

C/- The volatility of the members increases with relative molecular mass.

D. The members with more carbon atoms in their molecules burn more readily.

Metal Y and calcium are both in the same group of the Periodic Table. When equal mass of

Y and calcium respectively reacts with excess hydrochloric acid under the same condition, Y

gives more hydrogen than calcium does. Which of the following deductions is correct ?

/ A! The reactivity of Y is higher than that of calcium.v B..+- The metallic bond in Y is weaker than that in calcium.

C. The atomic number of Y is greater than that of calcium.D. The relative atomic mass of Y is smaller than that of calcium.

/

7

2OO7-CE.CHEM2_2

{ . i . * / - - . > . r i , . r

/Which of the following processes would be involved in order to separate Cu'-(aq) ions from a

mixture containing Cu2*(aq) and K*(aq) ions ?

M performing a flame test

J Bo. evaporating the mixtureC.- using a separating funnel

/D. adding NaOH(aq) to the mixture

X, Y and Z are metals. The table below shows the observations when each of them is put

into copper(Il) sulphate solution :7 .

Metal Observation

x no observable chanee --,

Y brown solid formed and colourless gas evolved

Z brown solid formed 7

Y. *f i '{'', \ \ i

l

Which of the following arrangements correctly represents the ascending order of reactivity ofthe metals ?

i'6ttJ/.

l B .! c .

D .

CIt

H r C - C - C H r" l r

czHs1

/ k \'./ B'

C . *D./-

X < Z < YY < Z < XZ < X < YX < Y < Z

2 What is the systematic name of the following compound ?

r {\ \I

i " - (I

i " .

2 - chlor o -2-ethy I p ro p ane2' chlor o -2- methy I b utaneI -chloro- 1, l -dimethylpropane2 - chlor o -2, 2 -d i m ethy lprop an e

" \ . l !

ve. Which of the following items can be made from polystyrene ?

A. clothing

#r 11 B.: food wrapt -"/

CA electric socketD-.- packaging material

Which of the following suggestions for storing chemicals is acceptable ?

/ A"( storing sodium in a brown glass bottle

*" B/- storing silver nitrate solution in an iron canC.< storing ethyl ethanoate in an expanded polystyrene container

-6. storing concentrated sulphuric acid in a polyvinyl chloride bottle

2OO7-CE-CHEM 2-3

ty'.(

D, J, R and Y represent four different compounds.equation :

\ D + 2 J - - + R + 2 Y

D and J react according to the following

of R and y grams of Y. \\'hat is the

t r /

d grams of D react with / grams of J to givevalue of y ?

d + j - rd + 2 i - r2 ( d + j - r )( d + 2 j - r ) t 2

r grams

J .

+,\il\

\( 's

- t !- t -

i / l

A./ B .v c .

D.

- B . L l yL c . y t 6 L

D . 6 y l L

/ B. loo cm3\t c. 2oo cm3

D. 260 cm3

Whioh of the following pairs of elements would form a covalent compound ?

A"r- mercury and neoni B# neon and nitrogen

{ C. c- mercury and fluorineD. fluorine and nitrogen

an element in the Periodic Table. M2- ioni s M ?

A. SeB. KrC. SrD. Rh

How many moles of ethane contain y hydrogen atoms ?

(L represents the Avogadro's constant.)

A . v l L

possesses 45 neutrons and 36 electrons.

r 1 -

t '

I1

I \^ ,

i - - t J ' {--i-r

Y'!- \ T Ll,

t r ' ' ' I t 1I ' '

l " 7

\ I

i l '

M i sWhat

/Y

t 4 .

I

r l {

L I l tu

:A t

What is the volume of 0.5 M hydrochloric acid required to reactwith 1.49 g of l i thium oxidefor complete neutralisation ?

(Relative atomic masses : Li : 6.9, O: 16.0)

A. 50 cm3

t ' " . "\ r

I

I r

J-Y,, ) . f -

r . l

t

/1

4-' i

4 , ' l' A

u . /-/?OO7-CE-CHEM 2_4

o \

+ i i l . ,

A mixture containing 25 cm3 of CHTCHzCHzOH, 25 cm3 of CHTCOOH and I cm3 ofconcentrated HzSOa is heated under reflux. After some time, a pleasant smell is detected.Which of the following statements concerning this experiment is correct ?

A/- A redox reaction is involved.

/ B. The reaction cannot go to completion.../ C.+- Concentrated H2SOa acts as areactant.

Dr-- One of the products is ethyl propanoate.

20cm3 of calcium chloride solution contains 1.0 x l0-2 moles of Cl-(aq) ions. What is themolarity of the solution ?

A.

/ B ./ c .

D.

1 . 0 x 1 0 + M , '2.5 x l0-4 M--2 .5 x l0 - r M5.0 x l0 - r M

0 ,

cr ̂ l

D

( ' r

Consider the information below :

Which of the following solids is likely to be an ionic compound ?

, (A . WB . XC . YD . Z

Chlorine is bubbled into an aqueous solutionchanges to brown. P is NOT likely to be

1 A. calcium hydroxide solution...i &< potassium iodide solution.'

C- iron(Il) chloride solution.D-s zinc bromide solution.

P for some time. The colour of P gradually

^ ,. ' '

- r L' ' \

)9

Sol id Melting point Electrical conductivitv Solubility in water

w high ,,2 goo&< insoluble

x high / non-conducting soluble

Y lopl- non-conducting soluble

Z very highJ- non-conducting insoluble

ZOO7.CE-CHEM 2_5

Directions : Questions 20 and 2l refer to the following experiment.

When carbon and concentrated sulphuric acid are heated together, sulphur dioxide and carbon dioxideare produced. These two gases are then passed through solution X and solution Y as shon'n belou. :

concentrated sulphuric acid

solution Y

ry / Which of the following combinations of solution X and solution Y can be used to shou' that

/ { sulphur dioxide and carbon dioxide are produced ?L

Which of the following statements concerning the reaction between carbon and concentratedsulphuric acid are correct ?

The oxidation number of carbon changes from 0 to +4. r

The oxidation number of hydrogen in sulphuric acid remains unchanged{Concentrated sulphuric acid acts both as a

QehVdrating pe{t,lnd an oxidising agent.

A. (l) and (2) onlyB. ( l ) and (3) onlyC. (2) and (3) onlyD. (1 ) , (2 ) and (3 )

22. Which of the following statements concerning chlorine, bromine and iodine is / are correct ?

They are all coloured substances. u'Their reactivity increases with relative atomic mass(They all react with sodium sulphite solution.

| ,\ h L A .

B .C.D.

Solution X

A. bromine water {

B. iron(Il) sulphate solutionC. acidified potassium dichromate solutionD. acidified potassium permanganate solution

Solution Y

calcium hydroxide solution '/calcium hydroxide solution /

sodium hydroxide solution+sodium hydroxide solution

-

2L .

( l )(2)(3)

J

( l )

a(3)

( l ) on ly(2) onlf-( l) and (3) only(2) and (3) orflS

solution X

TOO7.CE-CHEM 2_6

f Which of the following statements concerning

/ ( r )

€h

(3)

It is neutral to litmus solution. /

Its systematic name is propanol.c(

When it reacts with ethanoic acid. the ester formed is

H

IH r C - C - O H- l

cHl

is / are correct ?

H

IH : C - C - O - C - C H r- l t l

cHt o

A. ( l ) on lyB. (2) onlpC. ( l ) and (3) onlyD. (2) and (3) only._

consider the redox reaction represented by the equation below :

2 SrOr2-(aq) + Ir(aq) ---' S4O62-(aq) + 2l-(aq)- l

A. (1) only;_B. (2) only

Which of the following statements is / are correct ?

(l) The oxidation number of sulphur in SzO:2-(aq) is +f . {(2)

I One of the half equations of this reaction is 2 S2O32- (aq) -- S4O62-(aq) + 2e-(3) { Iz(aq) is oxidised by S2O32-(aq) in the reaction.

C.D.

(l) and (3) onlb<(2) and (3) only

25. which of the following processes would produce sulphur dioxide ?

( I ) roasting iron pyrite in air/(2) heating zinc with concentrated sulphur ic aci{

I

. - l

mixing dilute hydrochloric acid with sodium sulphiteor.

A. (l) and (2) onlyB. ( l ) and (3) onlyC. (2) and (3) onlyD. ( l ) , (2) and (3)

(3) *

T

2OO7-CE-CHEM2_7

,f Which of the following statements concerning the measures to reduce air pollutants is / arecorrect ?

(1) Scrubber can be used to reduce carbon monoxideJ-(2) Catalytic converter can be used to reduce nitrogen monoxide. z(3) Electrostatic precipitator can be used to reduce unburnt hydrocarbons. -..-

Jt. li A. ( l) onlY,r-/ I B. (2) only

C. ( l ) and (3) only-D. (2) and (3) only

Which of the following statements concerning but-2-ene are correct ?

(1) It has the same molecular formula as but-l -rnr. /

CHt H

t l(2)* It can form a polymer vvi1fi -C- as the repeating unit.

t lH CHr

(3) It can decolourise acidified potassium permanganate solution.

V A. (l) and (2) only*.B. (1) and (3) onlyC. (2) and (3) only. ;D . ( l ) , (2 ) and (3 ) v

Directions : Each question below (Question Nos. 28 to 30) consists of two separate statements.Decide whether each of the two statements is true or false: if both are true, thendecide whether or not the second statement is a correct explanation of the firststatement. Then select one option from A to D according to the following table :

A. Both statements are true and the 2nd statement is a correct explanation of the lst statement.B. Both statements are true but the 2nd statement is NOT a correct explanation of the lst

statement.C. The I st statement is false but the 2nd statement is true.D. Both statements are false.

lst statement 2nd statement

YnZg. Molten sulphur is a good conductor of Sulphur molecules are mobile in moltenelectricityy.- ,f-

C sulphur.

22 Isotopes of an element have the same mass.r Isotopes of an element have the same/ I number of protons.

. r ' \

10. Carbon can form a large number of Carbon atoms can share electrons with onecompounds with long carbon clains. another.

t\

,

2OO7 -CE-CHEM 2_8

END OF SECTION A

Section B

Directions : Questions 3l and 32 refer to the element astatine (At), which has an atomic number of8 5 .

Which of the following diagrams best represents the arrangement of particles in a sample ofastatine at room temperature and pressure ?

3/(.

A .

/ c .I

V

D.

Which of the following statements concerning astatine is correct ?

A. Astatine is soluble in heptane./

, B^ Astatine is a stronger oxidising agent than chlorine.

.I Q.a Astatine is an element in period 5 of the Periodic Table.t D.or- The formula of the compound formed between astatine

K2At.and potassium is

50 cm3 of carbon monoxide burns completely in 50 cm3 of oxygen. Assuming that allvolumes are measured at room temperature and pressure, what is the final gaseous volume atthe end of the combustion ?

(Molar volume of gas at room temperature and pressure : 24 dm3)

lrt,B .

3 2 .

A.B .C.D.

50 cm375 cm3

100 cm3150 cm3

? / - L ' . ' ; \ f (

a . L ' T v ' u - / , l ' ' -

f u t J i '

,Y

What mass of iron can be obtained by complete reduction of 7.18

(Relat ive atomic masses : Fe: 55.8, O = 16.0)

g of iron(III) oxide ?

, A . 2 . 5 1 gB . 3 . 8 6 g

\ c . 5 .02 gD . 5 . 5 8 g

ty--' r , ,) ,t. ,, l tf-r -i; -

t l t t ' ' ,1 '7 { ) r

o o o o o o o o @ 0o o o o o o @ o o

o o o o o o o o @ o

sB c3t d

oo \J

O o0

2O07.CE-CHEM 2-9

) ( ' ) - | : * ! t

Different metals are dropped into water orexperimental conditions are the same, whichinitial rates of hydrogen formation is correct ?

Initial rate ofhydrogen formation

A.+-- Ca and HzO

B. Fe and HCI

/ C. g- K and HzO

../ D. Cs and HzO

dilute hydrochloric acid. Assuming that theof the following comparisons concerning the

Initial rate ofhydrogen formation

Ba and HCI

K and HzO

Cs and HzO

Ca and HzO

The following diagram represents a chemical cell called fuel cell.

ozG)-* G Hz(g)

io,rel4 * Fr(g) +Hzo(g)

electrode Y electrode X

Hydrogen and oxygen are passed into the fuel cell. The half equations for the chemicalchanges occurring at electrode X and electrode Y are listed below :

t ,

at X : H2+2OH- '-- 2HzO +2e- nf ' '1 ''i "

a tY : O2+2H2O+4e- * 4OH-4 , L

, , i . i , .Which of the following statements concerning the fuel cell is correct ?

A. Reduction occurs at XA

/ B. A current flows from X to Y through the external circuit){ C. Both H2(g) and Oz(g) function as fuels in the cell.,-

D. The fuel cell is an environmentallv-friendlv chemical cell.

37. Which of the following mixtures can produce chlorine ?

A. chlorine bleach and lemon juice /

/ B. sodium chloride and vinegarA

.l C. polyvinyl chloride and caustic soda*D. hvdrochloric acid and limestoneY-

38. Which of the following methods is most suitable for preparing a sample of lead(Il) sulphate ?

/ A. adding lead to dilute sulphuric acid,. , il ( ;

/ B. adding lead to copper(Il) sulphate solutiorsr /1/ C. adding lead(Il) oxide to dilute sulphuric acidJ-.

D. adding lead(Il) nitrate solution to dilute sulphuric acid/

t

concentrated lNaOH(aq)-;

electrode Y

2007-cE-CHEM 2-10 l 0{u t

COz(g), SOr(g) and Oz(g) are composed of atoms of different elements. At roomtemperature and pressure, what is the ratio of the number of atoms involved in 100 cm3 ofCOz(g), 100 cm3 of SO3(g) and 200 cm3 of Oz(e) ?

(Molar volume of gas at room temperature and pressure : 24 dr43)

: 4: 2: 4: 2

aJ

aJ

2I

h A .t \ B .

C .

443I

I /, {-)I

" --7-'

/ . r t (

i

6

{ n

W f r ^- /,/ B'

C .D.

t j : 7

When 10g of PURE calcium carbonate (molar mass : 100.1 g) reaCted with excesshydrochloric acid, 2.40 dm3 of carbon dioxide was obtained at room temperature and pressure.However, in a similar experiment using 10 g of IMPURE calcium carbonate,2.50 dm3 ofcarbon dioxide was obtained. Assuming that the impurity is a metallic carbonate, whatwould this impurity be ?

( M o l a r m a s s e s : M g C O 3 : 8 4 . 3 g , Z n C O 3 : 1 2 5 . 4 g , F e C O 3 : 1 1 5 . 8 g , C u C O 3 : 1 2 3 . 5 g ;molar volume of gas at room temperature and pressure : 24 dm')

l r\ -.! n/

Which of the following items does NOT require the use of the products obtained fromelectrolysis of brine ?

A. manufacture of soaps*

7 B. manufacture of polyethene /

./ C. manufacture of bleacheslD. manufacture of hydrochloric acid +-

Which of the following pairs of compounds can form condensation polymers ?

( l ) * o ol l l l

H - C - H H z N - C - N H 2

/ A. MgCo3,,/ B. ZnCO3t

c. Feco3D. CuCOr

4r .

7

(2 ) ' /HzQ-CHz- l lHO OH

( 3 ) r H ol l l

H _ C - C _ O H

\ . H O

t t lH r C - C - C - O H- l

NHzI

NHz

(l) and (2) only(1) and (3) only(2) and (3) only( l ) , (2) and (3)

l l2007 -cE-cHEM 2-l I

4'/ Which of the following bonds or attractive forces exist in ammonium nitrate ?

/tt ionic bond(2) covalent bond ,/(3) van der Waals'forces

A{ (l) and (2) only /i" ' /

t r ( l ) and (3) only , rC. (2) and (3) onlyt*- Rb. (l), (2) and (3) ,'l|f ,, , . /

44. Which of the following statements concerning a zinc-carbon cell are correct ?

(1) Manganese(Iv) oxide acts as the anode."t-(2) Ammonium chloride acts as an electrolye. r(3) Zinc acts as the negative electrode. i

/j A. ( l ) and (2) only ;

B. (1) and (3) only-C. (2) and (3).o.lly< L^nD. ( l ) , (2 ) and (3 )

45/' Using carbon as electrodes, which of the following solutions would give hydrogen upon

/ electrolysis ?

(l) I M silver nitrate solution +- /(2) 2 M sodium hydroxide solutionr'(3) 3 M calcium chloride solution z

l l

/ A . ( l ) on ly " \

J B. (2) onlyC. ( l ) and (3) onlyD. (2) and (3) only : . ' t

4rv- Which of the following statements concerning the reaction of concentrated nitric acid with(''' copper is / are correct ?

(1) A colourless gas is evolved.(2) One mole of NO3-(aq) ions requires one mole of electrons for reduction. v/(3) It involves a displacement reaction.

/ A. ( 1) onty*-

I B. (2) onlyV C. (1) and (3) onlya--

D. (2) and (3) onlyl,

furr ' /t

2007 -cE-cHEM 2-t2 t 2

47. A student pours two different acids respectively into two test tubes, each containing a piece ofmagnesium ribbon of the same mass, until the ribbons are completely covered by the acids.If she wishes to compare the relative strength of the acids by observing the initial rate ofevolution of gas, which of the following items should be the same ?

( I ) volume of the acids( /(2) concentration of the acids/(3) basicity of the acids(

A.B .C.D .

( l ) and (2 ) on ly {( l ) and (3) only(2) and (3) only",( I ), (2) and (3) /

* t

Directions : Each question below (Question Nos. 48 to 50) consists of two separate statements.Decide whether each of the two statements is true or false; if both are true, thendecide whether or not the second statement is a correct explanation of the firststatement. Then select one option from A to D according to the following table :

A. Both statements are true and the 2nd statement is a correct explanation of the l st statement.B. Both statements are true but the 2nd statement is NOT a correct explanation of the lst

statement.C. The I st statement is false but the 2nd statement is true.D. Both statements are false.

48 .

ls t statement

Galvanised iron is used for makin g food 1

cans. Y

Cracking is an endothermic reaction. , ,/

50. Soapy detergent can be used to treat oil 7spil lage on sea surface.sf .ri

2nd statement

Zinc can prevent iron from rusting bysacrif i cial protection.

Cracking results in an increase of numberof molecules.

Soapy detergent can act as an emulsiffingagent for oil.

49 .

END OF PAPER

2007-cE-cHEM 2-13 l 3