hkdse chem fx mock exam paper 1 2012 set 3 eng
TRANSCRIPT
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
1/43
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
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 /
Set 3
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
2/43
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
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 2
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
3/43
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
4/43
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
5/43
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
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 4
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
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
6/43
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&
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 5
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
7/43
19. )hich of the follo"in statements about the incomplete combustion of octane 3
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
8/43
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
9/43
2&. )hen &>> cm& of 1.> ' h#drochloric acid is added to 2>> cm & of 1.> ' potassium
h#droide solution, the maimum temperature rise of the reaction miture is 5.>°.
)hat is the enthalp# chane of neutrali?ation bet"een h#drochloric acid and
potassium h#droide7
3Assume that the specific heat capacit# and densit# of the reaction miture are
4.2 −1 C −1 and 1.> cm−& respectivel#.
A. −&5.> % mol−1
B. −52.5 % mol−1
. −59.1 % mol−1
6. −&1.5 % mol−1
24. The standard enthalp# chanes of formation of c#clobutane and but1ene are iven
belo"@
%ompound
3f 4k5 mol 1
#clobutane =2/.9
But1ene =1.19
)hich of the follo"in statements are correct7
31 The standard enthalp# chane of combustion of c#clobutane is more eothermic
than that of but1ene.
32 The standard enthalp# chane for the conversion of but1ene to c#clobutane is
eothermic.
3& But1ene is more stable than c#clobutane.
A. 31 and 32 onl#
B. 31 and 3& onl#
. 32 and 3& onl#
6. 31, 32 and 3&
!"# O$ 0A(T &
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 8
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
10/43
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
11/43
. 32 and 3& onl#
6. 31, 32 and 3&
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 //
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
12/43
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
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
13/43
&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
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 /$
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
14/43
&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
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 /3
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
15/43
BHONG KONG DIPLOMA OF SECONDARY EDUCATION
EXAMINATION
CHEMISTRY PAPER 1
(MOCK EXAMINATION)
SECTION B : Quet!"#-A#$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
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
16/43
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 .
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%
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 /5
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
17/43
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 .
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 .
1. 3d A student suested that dilute h#drochloric acid should be used to acidif# the
silver nitrate solution. omment on his suestion.
31 mar%
3e Suest the chemical formula of the metal salt.
31 mar%
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 /6
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
18/43
A n s "
e r s " r i t t e n i n t h e m a r , i n s " i l l n o t b e
m a r % e d .
A n s " e r s " r i t t e n i n t h e m a r , i n s " i l l n o t b e m
a r % e d .
2. A tablet is known to contain calcium carbonate. To determine themass of calcium carbonate in the tablet, the following procedure wascarried out.
Step 1: The tablet was crushed and then added to a conical ask.
Step 2: Eactl! 2".# cm$ 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.
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 /7
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
19/43
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 .
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 .
31 mar%
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 /8
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
20/43
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 .
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 .
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
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 2%
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
21/43
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 .
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 .
$. 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%
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 2/
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
22/43
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 .
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 .
&. 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%
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 22
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
23/43
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 .
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 .
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
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 2$
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
24/43
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
25/43
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 .
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 .
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
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 24
platinum electrode Y platinum electrode X
solution containin u2=
3a! and Pb2=3a!
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
26/43
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 .
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 .
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
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 25
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
27/43
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 .
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 .
/. 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
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 26
copper metal X
solution of X 23S
4
& copper3 sulphate
solution
flo" of electron
porous partition
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
28/43
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 .
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 .
/. 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
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 27
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
29/43
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 .
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 .
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
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 28
'ar%erKs
Fse nl#
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
30/43
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 .
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 .
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
31/43
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 .
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 .
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
32/43
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 .
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.
:. 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.
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 $2
( 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 #
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
33/43
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 .
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 .
34 mar%s
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 $$
'ar%erKs
Fse nl#
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
34/43
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 .
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 .
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.
3& mar%s
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 $3
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
35/43
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 .
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 .
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.
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 $4
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
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
36/43
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 .
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 .
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 $5
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
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
37/43
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 .
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 .
3ii 8plain "h# the shape of curve B is different from that of curve A.
3& mar%s
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 $6
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
38/43
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 .
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 .
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
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 $7
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
39/43
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 .
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 .
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.
32 mar%s
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 $8
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
40/43
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 .
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 .
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.
32 mar%s
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 3%
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
41/43
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 .
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 .
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
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
42/43
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 .
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 .
HKDSE CHEMISTRY Mo,- E.am Pa(e" / 0Se' $1CHEMISTRY
A"i#'o Ed!,a'io&al P"e## L'd+ 2%/2 32
-
8/15/2019 HKDSE Chem FX Mock Exam Paper 1 2012 Set 3 Eng
43/43
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 .
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 .