HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng

8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng

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HONG KONG DIPLOMA OF SECONDARY EDUCATION EXAMINATION

CHEMISTRY PAPER 1

(MOCK EXAMINATION)

Time allowed: 2 o!"# $% mi&!'e#

Ti# (a(e" m!#' )e awe"ed i& E&*li#+

GENERAL INSTRUCTIONS

1. There are TWO sections, A and B, in this Paper. You are advised to finish Section A in about 45minutes.

2. Section A consists of multiplechoice !uestions in this !uestion paper, "hile Section B contains

conventional !uestions printed separatel# in $uestionAns"er Boo% B.

&. Ans"ers to Section A should be mar%ed on the 'ultiplechoice Ans"er Sheet "hile ans"ers to

Section B should be "ritten in the spaces provided in $uestionAns"er Boo% B. The Answer

Sheet for Section A and the Question-Answer Book for Section B will be collected

separately at the end of the examination.

4. A Periodic Table is printed on the bac% of $uestionAns"er Boo% B. Atomic numbers and

relative atomic masses of elements can be obtained from the Periodic Table.

INSTRUCTIONS FOR SECTION A (MULTIPLE-CHOICE QUESTIONS)

1. (ead carefull# the instructions on the Ans"er Sheet. )rite #our name, class and class number in

the space provided.

2. )hen told to open this boo%, #ou should chec% that all the !uestions are there. *oo% for the

"ords !"# O$ S!%T&O" A' after the last !uestion.

&. All !uestions carr# e!ual mar%s.

4. A"SW!( A)) Q*!ST&O"S. You are advised to use an +B pencil to mar% all the ans"ers on

the Ans"er Sheet, so that "ron mar%s can be completel# erased "ith a clean rubber. You must

mar% the ans"ers clearl#- other"ise #ou "ill lose mar%s if the ans"ers cannot be captured.

5. You should mar% onl# O"! ans"er for each !uestion. f #ou mar% more than one ans"er, #ou

"ill receive "O +A(,S for that !uestion.

/. 0o mar%s "ill be deducted for "ron ans"ers.

HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY

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Set 3


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This section consists of two parts. There are /uestions in 0A(T & and 1 /uestions

in 0A(T &&.

%hoose the best answer for each /uestion.

%andidates may refer to the 0eriodic Table printed on the back of Question-Answer

Book B.

0A(T &

1. #en can be obtained from the

31 fractional distillation of li!uefied air.

32 reaction bet"een calcium and "ater.

3& electrol#sis of dilute sodium chloride solution "ith raphite electrodes.

A. 31 onl#

B. 32 onl#. 31 and 3& onl#

6. 32 and 3& onl#

2. )hich of the follo"in elements are present in both limestone and sla%ed lime7

31 alcium

32 +#droen

3& #en

A. 31 and 32 onl#

B. 31 and 3& onl#

. 32 and 3& onl#

6. 31, 32 and 3&

&. )hich of the follo"in is 0T a chemical chane7

A. Sublimation of iodine

B. Addition of manesium to dilute h#drochloric acid. 8lectrol#sis of dilute copper3 sulphate solution

6. ombustion of %erosene


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11. onsider the follo"in eperimental setup.

)hich of the follo"in combinations is correct for the above setup7

X Y

A. Sodium #en

B. 'anesium #en

. 'anesium +#droen

6. opper +#droen

12. n "hich of the follo"in tubes "ill the iron nail rust after a fe" da#s7

31 32 3&

A. 31 and 32 onl#

B. 31 and 3& onl#

. 32 and 3& onl#

6. 31, 32 and 3&

1&. )hich of the follo"in samples contains the larest number of atoms7

A. 5.> of carbon dioide

B. 5.> of steam

. 5.> of nitroen

6. 5.> of sulphur trioide


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trouh

metal X

heat

"et sand

as Y

"ater

deliver# tube

air

iron nailiron nailair

>.1 ' sodium

h#droide

solution

>.1 ' calcium

chloride

solution

iron nail

>.1 ' sodium

h#droide

solution


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14. )hich of the follo"in statements about a neutrali?ation reaction is correct7

A. t is a redo reaction.

B. All the reactants involved must be in a!ueous state.

. The products of neutrali?ation are salt and carbon dioide onl#.

6. t is an eothermic reaction.

15. )hich of the follo"in ha?ard "arnin labels should be displa#ed on a bottle of

concentrated sulphuric acid7

A.

and

B.

and

.

and

6.

and

1/. onsider the follo"in reaction@

)hich of the follo"in statements concernin the above reaction are correct7

31 This is an addition reaction.

32 There is a colour chane in the reaction.

3& The reaction proceeds ver# slo"l# in dar%ness.

A. 31 and 32 onl#

B. 31 and 3& onl#

. 32 and 3& onl#

6. 31, 32 and 3&


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19. )hich of the follo"in statements about the incomplete combustion of octane 3


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2&. )hen &>> cm& of 1.> ' h#drochloric acid is added to 2>> cm & of 1.> ' potassium

h#droide solution, the maimum temperature rise of the reaction miture is 5.>°.

)hat is the enthalp# chane of neutrali?ation bet"een h#drochloric acid and

potassium h#droide7

3Assume that the specific heat capacit# and densit# of the reaction miture are

4.2 −1 C −1 and 1.> cm−& respectivel#.

A. −&5.> % mol−1

B. −52.5 % mol−1

. −59.1 % mol−1

6. −&1.5 % mol−1

24. The standard enthalp# chanes of formation of c#clobutane and but1ene are iven

belo"@

%ompound

3f 4k5 mol 1

#clobutane =2/.9

But1ene =1.19

)hich of the follo"in statements are correct7

31 The standard enthalp# chane of combustion of c#clobutane is more eothermic

than that of but1ene.

32 The standard enthalp# chane for the conversion of but1ene to c#clobutane is

eothermic.

3& But1ene is more stable than c#clobutane.

A. 31 and 32 onl#

B. 31 and 3& onl#

. 32 and 3& onl#

6. 31, 32 and 3&

!"# O$ 0A(T &


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. 32 and 3& onl#

6. 31, 32 and 3&


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2> C, >.25 mol of Pl&3 and >.1> mol of Pl53 "ere mied in a 1.> dm

& flas%.

)hen the s#stem has reached an e!uilibrium, >.>21 mol of chlorine as "as found in

the flas%. )hat is the value of the e!uilibrium constant at 4>> C7

A. >.>92 mol dm−&

B. >.>5& mol dm−&

. >.>59 mol dm−&

6. >.>11 mol dm−&

&>. A miture of 023 and 0243 is at e!uilibrium in a as s#rine.

0243 2023 H H D =5


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&1. n a sealed vessel, sulphur dioide and o#en react to ive sulphur trioide.

2S23 = 23 2S&3 C c D 2>.> mol−1dm&

At a certain time, the concentration of S23, 23 and S&3 are 1.> mol dm−&,

>.5 mol dm−& and 1.> mol dm−& respectivel#. )hich of the follo"in statements

concernin the s#stem are correct7

31 The e!uilibrium position shifts to the left.

32 The e!uilibrium position shifts to the riht.

3& The rate of for"ard reaction is hiher than that of bac%"ard reaction until an

e!uilibrium is established.

A. 31 and 32 onl#

B. 31 and 3& onl#

. 32 and 3& onl#

6. 31, 32 and 3&

&2. An oranic compound X has the follo"in chemical properties.

3 t can be reduced b# lithium aluminium h#dride.

3 t decolori?es acidified potassium permananate solution.

3 t does not decolori?e bromine in 1,1,1trichloroethane rapidl#.

)hich of the follo"in oranic compounds can X be7

A. +&+2+

B. +&+&. +2D++2+

6. +2D+−−+&

&&. onsider the follo"in multistep s#nthesis@

)hich of the follo"in combinations is correct7

P Q

A. *iAl+43s 0al3s

B C'n43a! Pl53s

. *iAl+43s Pl53s

6. C 2r 293a! 0al3s


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&4. )hich of the follo"in is a correct order of meltin point of phosphorus, sulphur,

chlorine and aron7

A. Phosphorus I Sulphur I hlorine I Aron

B. Sulphur I hlorine I Phosphorus I Aron

. hlorine I Aron I Phosphorus I Sulphur

6. Aron I hlorine I Phosphorus I Sulphur

#irections6 8ach !uestion belo" 3$uestions &5 to &/ consists of t"o separate

statements. 6ecide "hether each of the t"o statements is true or false- if both

are true, then decide "hether or not the second statement is a correct

eplanation of the first statement. Then select one option from A to 6

accordin to the follo"in table@

A. Both statements are true and the 2nd statement is a correct eplanation of the 1ststatement.

B. Both statements are true and the 2nd statement is 0T a correct eplanation of the 1st

statement.

. The 1st statement is false but the 2nd statement is true.

6. Both statements are false.

1st statement nd statement

&5. The cis isomer of an oraniccompound usuall# has a hiher

boilin point than its trans isomer.

&/. l2 reacts "ith "ater to ive

h#drochloric acid.

The cis isomer is usuall# more polar than thecorrespondin trans isomer.

l2 is acidic.

!"# O$ S!%T&O" A


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BHONG KONG DIPLOMA OF SECONDARY EDUCATION

EXAMINATION

CHEMISTRY PAPER 1

(MOCK EXAMINATION)

SECTION B : Quet!"#-A#$e% B""& B

Ti# (a(e" m!#' )e awe"ed i& E&*li#+

INSTRUCTIONS FOR SECTION B

0/1 9"i'e o!" &ame; ,la## a&d ,la## &!m)e" i& 'e#(a,e ("o


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e r s " r i t t e n i n t h e m a r , i n s " i l l n o t b e

m a r % e d .

A n s " e r s " r i t t e n i n t h e m a r , i n s " i l l n o t b e m

a r % e d .

0A(T &

Ans"er A)) !uestions. )rite #our ans"ers in the spaces provided.

1. An eperiment on the identification of a metal salt involves the follo"in steps@

Step 1@ Prepare approimatel# 2> cm& of a saturated solution of the metal salt in a

bea%er. 6ivide the solution into t"o e!ual portions.

Step 2@ To the first portion, 1.> mol dm−& of ammonia solution is added.

Step &@ To the second portion, & cm& of >.1 mol dm−& of acidified silver nitrate

solution is added.

The results are sho"n in the table belo"@

Step 2

A "hite precipitate "as first formed. Fpon addition of

ecess ammonia solution, the precipitate dissolved to

form a colourless solution.

Step & A "hite precipitate "as formed.

3a )h# is it desirable to use a saturated solution of the metal salt for the tests7

31 mar%

3b 6escribe ho" a 2> cm& of saturated solution of the metal salt is prepared in

Step 1.

32 mar%s

3c )rite an ionic e!uation for the formation of "hite precipitate in Step 2.

31 mar%


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1. 3d A student suested that dilute h#drochloric acid should be used to acidif# the

silver nitrate solution. omment on his suestion.

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3e Suest the chemical formula of the metal salt.

31 mar%


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2. A tablet is known to contain calcium carbonate. To determine themass of calcium carbonate in the tablet, the following procedure wascarried out.

Step 1: The tablet was crushed and then added to a conical ask.

Step 2: Eactl! 2".# cm$ of #.%# mol dm−$ h!drochloric acid wastransferred to the crushed tablet.

Step $: &nce the reaction between calcium carbonate andh!drochloric acid had stopped, meth!l orange indicator wasadded to the reaction miture.

Step ': A burette was rinsed and then used to deli(er #."# mol dm−$

sodium h!droide solution to the ask to neutrali)e theecess h!drochloric acid.

Step 5@ The colour of meth#l orane indicator chaned after 14.2> cm& of the sodium

h#droide solution "as added to the flas%.

3a State 08 observable chane in Step 2.

31 mar%

3b Suest an apparatus for transferrin h#drochloric acid to the crushed tablet in

Step 2.

31 mar%

*c+ rite a chemical e-uation for the reaction between calciumcarbonate and h!drochloric acid.

31 mar%

*d+ alculate the number of moles of h!drochloric acid added to thecrushed tablet.


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2. *e+ Suggest how the burette should be rinsed before use in Step '.

31 mar%

*f+ alculate the mass of calcium carbonate in the tablet.

3& mar%s


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A n s "


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$. Petroleum contains a miture of h#drocarbons. Before use, it is first separated intodifferent fractions in an oil refiner#.

3a 0ame the process b# "hich different fractions can be separated from petroleum.

31 mar%

3b 0aphtha and as oil are t"o of the fractions obtained from petroleum. 8plain

"h# as oil has a hiher boilin point rane than that of naphtha.

3& mar%s

3c ne of the compounds present in the naphtha fraction is nonane, :+2>. 0onane

can be crac%ed to produce ethene and an al%ane X . )rite a chemical e!uationrepresentin this process.

31 mar%


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&. 3d 8thene is rearded as a Jflammable asK. t burns easil# in the presence of air.

3i )rite a chemical e!uation representin the complete combustion of ethene.

31 mar%

3ii +o"ever, ethene is seldom used as fuel. Suest a reason for this.

31 mar%


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4. A roup of scientists is oin to conduct a research at 0orth Pole for 1> "ee%s. 6urin

this period, t"o different methods "ill be used for providin ener# from ethanol.

Some ethanol "ill be burnt directl# to provide ener# for heatin and coo%in. The

e!uation for the combustion of ethanol is sho"n belo"@

+&+2+3l = &23 → 223 = &+23l

3a alculate the standard enthalp# chane of combustion of

ethanol, H H c L+&+2+3lM.

Niven that@

H H f L+&+2+3lM D −299.9 % mol

−1

H H f L23M D −&:&.5 % mol

−1

H H f L+23lM D −2> >>> % per "ee%. alculate the total mass of ethanol, in %, that "ill be

needed to satisf# the heatin and coo%in re!uirements of the research team for 1>

"ee%s.

3& mar%s


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5. An ore contains a miture of copper and lead compounds, in "hich copper compound

has a larer proportion. A chemist etracts the metal ions b# roastin the ore in air and

then dissolvin the product in an acid. The solution that contains u2=3a! and Pb2=3a!

ions is then placed in an electrol#tic cell as sho"n in the diaram belo"@

3a )hich electrode, X or Y , is the cathode of the electrol#tic cell7

31 mar%

3b )hich acid, h#drochloric acid or nitric acid, should be used for etractin the

metal ions7 8plain #our ans"er.

32 mar%s

3c )rite half e!uations for the anodic and cathodic reactions "hen an electric current

flo"s in the cell.

Anodic reaction@

athodic reaction@

32 mar%s


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platinum electrode Y platinum electrode X

solution containin u2=

3a! and Pb2=3a!


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5. 3d As electrol#sis oes on, another half reaction occurs at the cathode. )rite the

e!uation for this half reaction.

31 mar%

3e f the chemist used copper electrodes instead of platinum electrodes to set up thecell, ho" "ould this affect the reaction7 8plain #our ans"er "ith appropratie

half e!uation3s.

32 mar%s


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/. To compare the reactivit# bet"een copper and a metal X , a simple chemical cell is

made as sho"n belo"@

3a State 08 mista%e in the above setup.

31 mar%

3b )hat is the purpose of usin the porous partition7

32 mar%s


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copper metal X

solution of X 23S

4

& copper3 sulphate

solution

flo" of electron

porous partition


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/. 3c )hen the mista%e mentioned in 3a is corrected, a readin is recorded in the

voltmeter.

3i )hich metal, copper or metal X , is more reactive7 8plain #our ans"er.

31 mar%

3ii State 08 observable chane in the compartment containin copper3

sulphate solution. 3hemical or ionic e!uations are not re!uired.

31 mar%

3d Eor convenience, a student suests that copper3 sulphate solution can be used

as electrol#tes in both compartments. )hat "ould happen to the voltmeter

readin7 8plain #our ans"er.

32 mar%s


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9. Silicon can react "ith o#en or chlorine to form a covalent compound.

3a )hat is the chemical formula of the compound formed bet"een silicon and

o#en7

31 mar%

3b 6ra" the electron diaram of the compound formed bet"een silicon and chlorine,

sho"in electrons in the outermost shells onl#.

31 mar%

O3c )hich compound of silicon, the one formed in 3a or 3b, has a hiher densit#7

8plain #our ans"er.

3& mar%s


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'ar%erKs

Fse nl#


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0A(T &&

Ans"er A)) !uestions. )rite #our ans"ers in the spaces provided.

:. 3a S%etch the trend of the relative electrical conductivities of Period & elements in

the diaram belo".

32 mar%s

O3b 8plain the trend of the relative electrical conductivities of the Period & elements.


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( e

l a t i v e e l e c t r i c a l c o n d u c t i v i t #


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'ar%erKs

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1>. utline a s#nthetic route, "ith no more than three steps, to accomplish the follo"in

conversion. Eor each step, ive the reaent3s, reaction conditions and structure of the

oranic product.

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11. A student performed an eperiment to stud# the reaction rate bet"een 2.> of calcium

carbonate po"der and 5>.> cm& of 1.> ' h#drochloric acid 3ecess at room

temperature and pressure. n this eperiment, the volume of as collected "as

recorded. The results "ere plotted as curve A in the raph belo".

3a At "hich time, X or Y , is the reaction rate faster7 8plain #our ans"er b# usin

collision theor#.

32 mar%s

3b f the same eperiment is done ecept usin 25.> cm& of 1.> ' sulphuric acid

3ecess instead.

3i S%etch the volume of 2 collected aainst time in the diaram belo" and

label the curve as B.


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curve A

Y

X

Time 3min

G o l u m e o f 5 1 2 c o l l e c t e d 3 c m & 4


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Time 3min

curve A

G o l u m e o f 5 1 2 c o l l e c t e d 3 c m & 4


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3ii 8plain "h# the shape of curve B is different from that of curve A.

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12. A student conducted an eperiment to prepare an ester from the reaction bet"een

ethanol and methanoic acid. The ester formed has a boilin point of 5&.4°.

3a )hat is the s#stematic name of the ester formed7

31 mar%

3b +o" can "e increase the rate of this reaction7

32 mar%s

3c The ester "as separated from the reaction miture b# distillation. +o"ever, the

distillate 3the ester collected ma# contain unreacted ethanol and unreacted

methanoic acid. To purif# the distillate collected,

3i suest a method to remove the unreacted methanoic acid.

3ii suest a method to remove the unreacted ethanol.

32 mar%s


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12. 3d After the ester has been purified in 3c, the ester still contains some "ater.

3i s it appropriate to dr# the ester b# "armin it in an oven7 8plain #our

ans"er.

3ii Suest an appropriate method for dr#in the ester.

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1&. The e!uilibrium constants of ioni?ation of "ater and that of ethanoic acid at 2:< C are

sho"n belo"@

+23l +=3a! = +−3a! C 1 D x mol

2 dm−/

+&+3a! +&−3a! = +=3a! C 2 D y mol dm

−&

3a 3i )rite an epression of C 1 for the ioni?ation of "ater.

3ii )rite an epression of C 2 for the ioni?ation of ethanoic acid.

32 mar%s

3b 3i Eor the e!uilibrium belo",

+&−3a! = +23l +&+3a! = +

−3a! C & D 7

Eind the value of C & in terms of x and y.

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1&. 3ii Niven that the value of C & is 5 1>−1> mol dm−& at 2:< C. )hat is the e!uilibrium

concentration of h#droide ions if


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HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng

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Transcript of HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng