Ce Chemistry 2007 Paper 2

2007-cE CHEM PAPER2

AND ASSESSMENTAUTHORITY HONG KONG EXAMINATIONS OF EDUCATIONEXAMINATION2OO7 HONG KONG CERTIFICATE

2 GHEMISTRYPAPER

(MULTIPLE-CHOICE)

11.00am- 12.00noon (1 hour) SubjectCode 160

l.

Read carefully the instructionson the Answer Sheet. Stick a barcode label and insert the information requiredin the spacesprovided.

2.

When told to open this book, you should check that all the questionsare there. Look for the words .END OF PAPER' after the last question.

3.

All questionscarry equal marks.

4.

ANSWER ALL QUESTIONS.

5.

You shouldmark only ONE answerfor eachquestion. If you mark more than one answer,you will receive NO MARKS for that question.

6.

No markswill be deductedfor wrong answers.

@6666 ffi4;rt&#t .H

You shouldmark all your answerson the Answer Sheet.

IRWffF{H

HongKongExaminations andAssessmentAuthority All RightsReserved2007 2007-cE-cHEM2-l

I

Not to be taken away beforethe end of the examinationsession

This paper consistsof two sections.There are 30 questionsin Section A and 20 questionsin SectionB. Choosethe best answer for each question. Candidatesmay refer to the Periodic Table printed on page 16 when answeringthe questions.

SectionA

/

Which of the following pairs of aqueoussolutions can be distinguishedb1' usine dilute acid ? 1'rydrochloric

{

Al/ €. CDA D.*

/

:

hasa sharpboiling point ? Which of the following substances

A. B.-rC. .ffi

/ V

:

zinc iodide and zinc bromide silver nitrate and magnesiumsulphate potassiumhydroxideand sodiumhydroxide sodiumcarbonateand calcium hydrogencarbonate

petrol redwine moltenwax liquidammonia

X is an element in the Periodic Table and X* ion has an electronicarrangementof 2, 8, 8. Which of the following statementsconcerningX is correct? A. B. C.

1 J

O.

X is a halogenA X is a transitionelementA Xisagroup0element. Xisaperiod4element.

2 7't

Which of the following statementsconcerningmembersof a homologousseriesis correct?

/

f

7

b

NBA C/D.

The membershavethe samemolecularformula. The relativemolecularmassof eachsuccessivememberdiffers by 14. The volatility of the membersincreaseswith relativemolecularmass. The memberswith more carbonatomsin their moleculesburn more readily.

Metal Y and calcium are both in the samegroup of the PeriodicTable. When equal massof Y and calcium respectivelyreactswith excesshydrochloricacid under the samecondition,Y gives more hydrogenthan calcium does. Which of the following deductionsis correct?

v

/

A! B..+C. D.

The reactivityof Y is higherthan that of calcium. The metallic bond in Y is weakerthan that in calcium. The atomic numberof Y is greaterthan that of calcium. The relativeatomic massof Y is smallerthan that of calcium. {.i.*

2OO7-CE.CHEM2_2

/

--.>.

r

i

,

.r

Which of the following processeswould be involved in order to separateCu'-(aq) ions from a mixture containingCu2*(aq)and K*(aq) ions ?

/

M Bo. C./D.

J

7.

performinga flame test evaporatingthe mixture using a separatingfunnel adding NaOH(aq) to the mixture

X, Y and Z are metals. The table below shows the observationswhen each of them is put into copper(Il) sulphatesolution :

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

Observation

Metal

--,

x

no observablechanee

Y

brown solid formed and colourlessgasevolved

Z

brown solid formed

l

7

correctlyrepresentsthe ascendingorder of reactivityof Which of the following arrangements the metals ? i'6t

tJ/.

l B . ! c . D.

2

X
What is the systematicnameof the following compound? r\ {\

CI

t HrC-C-CHr "

l

r

czHs

I

i" - ( I

i " .

1 /

'./

k

\

B' C.* D./-

ve.

"\.

l!

2- chlor o -2-ethy Ipropane 2' chloro-2-methyIbutane I -chloro-1,l -dimethylpropane 2- chloro-2,2-di methylpropane

Which of the following items can be madefrom polystyrene?

#r 11 t -"/

A. B.: CA D-.-

clothing food wrap electricsocket packagingmaterial

Which of the following suggestionsfor storingchemicalsis acceptable? / *"

A"( B/C.< -6.

2OO7-CE-CHEM 2-3

storingsodium in a brown glassbottle storingsilver nitratesolution in an iron can storingethyl ethanoatein an expandedpolystyrenecontainer storingconcentrated sulphuricacid in a polyvinyl chloride bottle

D, J, R and Y representfour differentcompounds. D and J reactaccordingto the following equation:

ty'. (

\D+2J

- - +R + 2 Y \\'hat is the

d grams of D react with / grams of J to give r gramsof R and y grams of Y. valueof y ? J .

A. B .

/

v

c

.

D.

+,

d+j-r d+2i-r 2(d+j-r) (d+2j-r)t2

t

r

/

's

\(

\ il\

-

t

! -t-

I

/l

i

1

? wouldforma covalentcompound Whiohof the followingpairsof elements

i {

A"rB# C. cD.

mercuryandneon neonandnitrogen mercuryandfluorine fluorineandnitrogen

45 neutronsand 36 electrons. M i s an element in the Periodic Table. M2- ion possesses Whati s M ? A. B. C. D.

/ Y

Se Kr Sr Rh

r1t'

How many moles of ethanecontainy hydrogenatoms?

t4.

(L represents constant.) theAvogadro's r

I

L

A.

vlL

B. c. D.

Lly yt6L 6ylL

l {

L I ltu

I \^,

:At

What is the volume of 0.5 M hydrochloricacid requiredto reactwith 1.49g of lithium oxide for completeneutralisation? (Relativeatomicmasses: Li : 6.9, O: 16.0)

/ \t

A. B. c. D.

50 cm3

loocm3 2oocm3 260 cm3

i

t'"."

\ r I

Ir

Y,,

J-

--

'!- \ T Ll,

{ --i-r

tJ'

Y

It r'' ''' l "

I 7

\ I

t1

il'

)

.

f r

+

-

. t

/1

4-'

?OO7-CE-CHEM 2_4

4'

A

i

,'l

u .

-//

o

\

l

i

il.,

A mixture containing 25 cm3 of CHTCHzCHzOH,25 cm3 of CHTCOOH and I cm3 of concentratedHzSOais heatedunder reflux. After some time, a pleasantsmell is detected. Which of the following statementsconcerningthis experimentis correct? A redoxreactionis involved. The reactioncannotgo to completion. ConcentratedH2SOaactsas areactant. One of the productsis ethyl propanoate.

A/B. C.+Dr--

/ ../

20cm3 of calcium chloridesolutioncontains1.0 x l0-2 moles of Cl-(aq) ions. What is the molarity of the solution? 1 . 0x 2.5 x 2.5 x 5.0x

A. /

B

.

/ c .

D.

0 ,

1 0 +M , ' l0-4 M-l0-r M l0-r M

cr^l ('r D

Considerthe informationbelow : Melting point

So l i d

Electricalconductivitv

Solubility in water

w

high ,,2

goo&<

insoluble

x

high /

non-conducting

soluble

Y

lopl-

non-conducting

sol ubl e

Z

very highJ-

non-conducting

i nsol ubl e

^ ,.''

-' r' L\

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

,(

)9

A B C D

. . . .

W X Y Z

Chlorineis bubbledinto an aqueous solutionP for some time. The colour of P gradually changes to brown. P is NOT likelyto be 1 ..i'

A. &< CD-s

ZOO7.CE-CHEM2_5

calciumhydroxidesolution. potassium iodidesolution. iron(Il)chloridesolution. zincbromidesolution.

Directions : Questions20 and2l refer to the following experiment. When carbonand concentratedsulphuricacid are heatedtogether,sulphur dioxide and carbon dioxide are produced. Thesetwo gasesare then passedthroughsolutionX and solutionY as shon'nbelou.:

sulphuricacid concentrated

solution X

ry / L

{

/

Whichof the followingcombinations of solutionX andsolutionY canbe usedto shou'that ? sulphurdioxideandcarbondioxideareproduced

A. B. C. D.

2L.

SolutionX

SolutionY

bromine water { iron(Il) sulphatesolution acidified potassiumdichromatesolution acidified potassiumpermanganate solution

calcium hydroxidesolution '/ calciumhydroxidesolution/ sodiumhydroxidesolution+ sodiumhydroxidesolution

Which of the following statementsconcerningthe reactionbetweencarbon and concentrated sulphuricacid are correct?

(l) (2) (3)

J

22.

solutionY

The oxidationnumberof carbonchangesfrom 0 to +4. r The oxidationnumberof hydrogenin sulphuricacid remainsunchanged{ Concentratedsulphuricacid actsboth as a pe{t,lnd an oxidising agent. QehVdrating A. B. C. D.

(l) and (2) only (l ) a n d(3 ) o n l y (2) and (3) only ( 1 ) , ( 2 ) a n d( 3 )

Whichof the followingstatements concerning chlorine,bromineandiodineis / arecorrect? (l)

u' They are all colouredsubstances. Their reactivity increaseswith relativeatomic mass( They all reactwith sodiumsulphitesolution.

a (3) |

\hL

,

A. B. C. D.

TOO7.CE-CHEM 2_6

(l) only (2) onlf(l) and(3)only (2) and(3) orflS

H

f

I

Which of the following statementsconcerning H r C - C - O H

-

/

is / are correct ?

l

cHl

(r)

It is neutralto litmussolution./

€h

Its systematic nameis propanol.c( H

(3)

I l

When it reactswith ethanoicacid.the esterformed is H : C - C - O - C - C H r

-

cHt A. B. C. D.

t

l

o

(l) only (2) onlp (l ) a n d(3 ) o n l y (2) and (3) only._

consider the redox reactionrepresented by the equationbelow : 2 SrOr2-(aq)+ Ir(aq) ---' S4O62-(aq) + 2l-(aq) - l

Which of the following statementsis / are correct? (l) (2) I (3) {

The oxidationnumberof sulphurin SzO:2-(aq) is +f . { One of the half equationsof this reactionis 2 S2O32(aq) -Iz(aq)is oxidisedby S2O32-(aq) in the reaction.

A. B. C. D.

(1) only;_ (2) only (l) and(3) onlb< (2) and(3) only

I

.

25.

- l

which of the following processeswould producesulphurdioxide ? (I) (2)

(3)

*

T

roastingiron pyrite in air/ heatingzinc with concentratedsulphuric aci{ mixing dilute hydrochloricacid with sodiumsulphiteor. A. B. C. D.

2OO7-CE-CHEM2_7

(l) and (2) only (l ) a n d(3 ) o n l y (2) and (3) only (l ), (2 ) a n d (3 )

+ 2eS4O62-(aq)

,f

Which of the following statementsconcerningthe measuresto reduce air pollutantsis / are correct ? Scrubbercan be usedto reducecarbonmonoxideJCatalyticconvertercan be usedto reducenitrogenmonoxide.z Electrostaticprecipitatorcan be usedto reduceunburnthydrocarbons.-..-

(1) (2) (3)

( l) onlY,r(2 ) o n l y (l ) a n d(3 ) o nl y(2) and (3) only

A. B. C. D.

Jt. li / I

Which of the following statementsconcerningbut-2-eneare correct? (1)

It hasthe samemolecularformulaas but-l -rnr. / CHt H

(2)*

It can form a polymer vvi1fi-C-

(3)

H CHr It can decolouriseacidifiedpotassiumpermanganate solution.

l

t

l

as the repeatingunit.

(l) and (2) only*. (1 ) a n d(3 ) o nl y (2 ) a n d (3 ) o nl y.; ( l ) , ( 2 ) a n d( 3 ) v

A. B. C. D.

V

t

Directions : Each questionbelow (QuestionNos. 28 to 30) consistsof two separatestatements. Decide whether each of the two statementsis true or false: if both are true, then decide whether or not the second statementis a correct explanationof the first statement. Then selectone option from A to D accordingto the following table : A. Both statementsare true and the 2nd statementis a correctexplanationof the lst statement. B. Both statementsare true but the 2nd statementis NOT a correct explanation of the lst statement. C. The I st statementis falsebut the 2nd statementis true. D. Both statementsare false. lst statement YnZg.

2nd statement

Molten sulphur is a good conductor of

,f-

electricityy.-

C

22 Isotopes of anelementhavethe samemass.r / I .

10.

r

'

Sulphur molecules are mobile in molten

sulphur. Isotopesof an elementhave the same numberof protons.

\

Carbon can form a large number of compoundswith long carbonclains.

\

Carbon atoms can shareelectronswith one another.

t

END OF SECTION A

,

-CE-CHEM2_8 2OO7

SectionB Directions : Questions3l and 32 refer to the elementastatine(At), which has an atomic number of 85.

3/ (.

Which of the following diagramsbest representsthe arrangementof particles in a sampleof astatineat room temperatureand pressure?

A.

B.

I

/ c .

V

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

B

t

D.

32.

s

c3 d

o

o 0

lrt,

\J

O

o

Which of the following statementsconcerningastatineis correct? A. B^ Q.a D.or-

, .I t

Astatineis solublein heptane./ Astatineis a strongeroxidising agentthan chlorine. Astatineis an elementin period5 of the PeriodicTable. The formula of the compound formed between astatineand potassiumis K2At.

50 cm3 of carbon monoxide burns completely in 50 cm3 of oxygen. Assuming that all volumesare measuredat room temperatureand pressure,what is the final gaseousvolume at the end of the combustion? (Molar volume of gasat room temperatureand pressure: 24 dm3)

A. B. C. D.

5 0 c m3 75 cm3 1 0 0c m3 1 5 0c m 3

'.';

?/-

L

T

v'u

f

u

t

a.L'

-/\

J

,l

i

(

f

'' -

'

,Y

What massof iron can be obtainedby completereductionof 7.18 g of iron(III) oxide ? ( R e l a ti v ea to mi cm a s s e s: F e : 5 5 .8,O = 16.0)

, \

A. B. c. D.

2 . 5 1g 3 . 8 6g 5 . 0 2g 5 . 5 8g

ty--

'r, ,) ,,lt ,t.

f-r-i; t l tt' ' ,1' 7{ )r

2O07.CE-CHEM 2-9

: * ! t ) ( ' ) -

|

Different metals are dropped into water or dilute hydrochloric acid. Assuming that the experimentalconditions are the same, which of the following comparisonsconcerningthe initial ratesof hydrogenformation is correct? Initial rate of hydrogenformation

Initial rate of hydrogen formation

/ ../

A.+-B. C. gD.

Ca Fe K Cs

and and and and

Ba K Cs Ca

HzO HCI HzO HzO

and and and and

HCI HzO HzO HzO

The following diagramrepresentsa chemicalcell calledfuel cell.

ozG)-*

G

Hz(g)

*

Fr(g)+Hzo(g)

concentratedl NaOH(aq)-;

io,rel4 electrodeX

electrodeY

Hydrogen and oxygen are passedinto the fuel cell. The half equationsfor the chemical changesoccurringat electrodeX and electrodeY are listedbelow : t

,

' ''i " H2+2OH- '-- 2HzO+2e- nf '1 O2+2H2O+4e- * 4OH4,L ,,i.i,. Which of the following statementsconcerningthe fuel cell is correct? at X : atY:

{

37.

A. B. C. D.

/

Which of the following mixturescan producechlorine?

/ .l

38.

Reductionoccursat XA A current flows from X to Y through the external circuit) Both H2(g)and Oz(g)function as fuels in the cell.,The fuel cell is an environmentallv-friendlvchemicalcell.

A. B. C. D.

chlorinebleachand lemon juice / sodium chlorideand vinegarA polyvinyl chlorideand causticsoda* hvdrochloricacid and limestoneY-

Which of the following methodsis most suitablefor preparinga sampleof lead(Il) sulphate? / / 1/

A. B. C. D.

adding leadto dilute sulphuricacid,. , adding leadto copper(Il) sulphatesolutiorsr / adding lead(Il) oxide to dilute sulphuricacidJ-. adding lead(Il) nitratesolutionto dilute sulphuric acid/

{

2007-cE-CHEM 2-10

u t

l0 t

il (

;

COz(g), SOr(g) and Oz(g) are composed of atoms of different elements. At room temperatureand pressure,what is the ratio of the number of atoms involved in 100 cm3 of COz(g),100 cm3of SO3(g)and 200 cm3of Oz(e)? (Molar volume of gas at room temperatureand pressure: 24 dr43) a J

h A . t\

4 4 3 I

a J

B. C.

2 I

{ n

: : : :

4 2 4 2

I /, " {-) I --7-' /.rt(

i

t

6

j

:

7

When 10g of PURE calcium carbonate (molar mass : 100.1g) reaCtedwith excess hydrochloricacid, 2.40 dm3of carbondioxide was obtainedat room temperatureand pressure. However, in a similar experimentusing 10 g of IMPURE calcium carbonate,2.50dm3 of carbon dioxide was obtained. Assuming that the impurity is a metallic carbonate,what would this impurity be ? :123.5g; ( M o l a rm a s s e:sM g C O 3 : 8 4 . 3g , Z n C O 3 : 1 2 5 . 4g , F e C O 3 : 1 1 5 . g8 , C u C O 3 molar volume of gasat room temperatureand pressure: 24 dm') l r

/ ,,/ t

4r.

\ -

MgCo3 ZnCO3 Feco3 CuCOr

.!n/

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

7 ./

7

A. B. c. D.

A. B. C. D.

manufactureof soaps* manufactureof polyethene manufactureof bleachesl manufactureof hydrochloricacid +-

/

Which of the following pairsof compoundscan form condensation polymers?

(l)*

o

o

l

l

H-C-H

l l HzN-C-NH2

(2)'/ HzQ-CHz - l l HO

(3)r

OH

H

\

o

l l l

H_C-C_OH

I

.

,/

B' C. D.

2007-cE-cHEM 2-l I

O

t t l

-

l

HrC-C-C-OH

NHz

W- f / r ^

H

NHz

(l) and (2) only (1 ) a n d (3 ) o n l y (2) and(3) only (l ), (2 ) a n d (3 )

ll

4'/ /

Which of the following bondsor attractiveforcesexist in ammoniumnitrate ? ionic bond covalentbond ,/ van der Waals'forces

tt (2) (3)

A{ tr C. b.

44.

j

/

'

/

,r R ,'l|f, , ., /

Manganese(Iv)oxide actsas the anode."tAmmonium chloride actsas an electrolye. r Zinc actsas the negativeelectrode. i

/

A. B.

(l ) a n d (2 ) onl y ; (1 ) a n d (3 ) onl y-

C.

(2)and(3).o.lly<

D.

( l ) , ( 2 ) a n d( 3 )

L^n

Using carbon as electrodes,which of the following solutions would give hydrogen upon electrolysis? I M silvernitratesolution+/ 2 M sodiumhydroxidesolutionr' 3 M calciumchloridesolution z

(l) (2) (3)

A. B. C. D.

/ J

4rv('''

/i"

Which of the following statementsconcerninga zinc-carboncell are correct? (1) (2) (3)

45/'

(l) and (2) only ( l ) a n d(3 ) onl y (2) and (3) onlyt*(l), (2) and (3)

"\

(l) only (2) only (l ) a n d (3 ) onl y (2 ) a n d (3 ) onl y

l

l

: .' t

Which of the following statementsconcerningthe reaction of concentratednitric acid with copper is / are correct ? (1) (2) (3)

A colourlessgasis evolved. One mole of NO3-(aq)ionsrequiresone mole of electronsfor reduction.v/ It involvesa displacementreaction. / A.

I

V

( 1) onty*-

B.

(2)only

C. D.

(1) and (3) onlya-(2) and(3) onlyl,

furr'

/ t

2007-cE-cHEM 2-t2

t2

47.

A studentpours two different acidsrespectivelyinto two test tubes,eachcontaininga pieceof magnesiumribbon of the same mass,until the ribbons are completely coveredby the acids. If she wishes to comparethe relative strengthof the acids by observing the initial rate of evolutionof gas,which of the following items shouldbe the same? (I) (2) (3)

volume of the acids( / concentration of the acids/ basicityof the acids(

A. B. C. D. Directions

( l ) a n d( 2 ) o n l y { (l ) a n d(3 ) o n l y (2) and (3) only", ( I ), (2) and(3) /

*t

: Each questionbelow (QuestionNos. 48 to 50) consistsof two separatestatements. Decide whether each of the two statementsis true or false; if both are true, then decide whether or not the second statementis a correct explanationof the first statement. Then selectone option from A to D accordingto the following table :

A. Both statementsare true and the 2nd statementis a correctexplanationof the l st statement. B. Both statementsare true but the 2nd statementis NOT a correct explanation of the lst statement. C. The I st statementis falsebut the 2nd statementis true. D. Both statementsare false. l s t s ta te me n t

2nd statement

4 8 . Galvanisediron is usedfor making food cans.

Zinc can prevent iron from rusting by sacrificial protection.

Y1

4 9 . Crackingis an endothermicreaction., ,/

Crackingresults in an increaseof number of mol ecul es.

50. Soapy detergent can be used to treat oil 7 spillageon seasurface.sf .ri

Soapy detergentcan act as an emulsiffing agentfor oil.

END OF PAPER

2007-cE-cHEM2-13

l3