ZIMBABWE SCHOOL EXAMINATIONS COUNCIL
General Certificate of Education Advanced Level
CHEMISTRY
PAPER 1
9189/1
NOVEMBER 2014 SESSION
Additional materials:
Answer paper
Data Booklet
Mathematical tables and/or electronic calculator
Graph paper
2 hours
TIME: 2 hours
INSTRUCTIONS TO CANDIDATES
;
Write your name, Centre number and candidate number in the spaces provided on the answer
paper/answer booklet.
Answer six questions.
Answer two questions from Section A, one question from Section B, two questions from Section C
and one other question chosen from any section.
Write your answers on the separate answer paper provided.
If you use more than one sheet of paper, fasten the sheets together.
INFORMATION FOR CANDIDATES
The number of marks is given in brackets [ ] at the end of each question or part question.
You are reminded of the need for good English and clear presentation in your answers.
This question paper consists of 9 printed pages and 3 blank pages.
Copyright: Zimbabwe School Examination Council, N2014.
�ZI�1SEC N2014
[Turn over
_______________ ____
(
Centre Number
Candidate Name
Candidate Number
______._
•
ZIMBABWE SCHOOL EXAMINATIONS C()UNCI
General Certificate of Education Advanced Level
CHEMISTRY
9ll89/2
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PAPER 2 Theory
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NOVEMBER 2014 SESSION
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Candidates answer :on the question paper.
Additional materials:
._ Data Booklet
Mathematical Tables and/or: Calculator
:·
1 hour 15. nunutes
'
·t ..
• --
TIME 1 hour 15 minutes
INSTRUCTIONS TO CANDIDATES
'
Write your name, Centre number and candidate num?{;r in the spaces at the top of this page.
Answer a_ll question1-1.
Write your answers jn the spaces provided on the question paper.
INFORMATION FOR CANDIDATES
The number of marks' is given in brackets [ ] at the end of
each q�estion or part question.
FOR EXAMIN1?iR'S USE
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TOTAL
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This question paper consists of 8 printed pages.
Copyright: Zimbabwe School Examinations Council, N2014.
[Turn over
CCJZ.IMSEC N2014
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' 1
2
For
Bnmma'11
Use
A mixture of nitrogen and hydrogen was allowed to come to an equilibrium at
400 K. The initial amounts of nitrogen and hydrogen were 2.0 moles.· At
equilibrium 0.20 moles of nitrogen had reacted.
(a)
W'rite an expression for Kp ,
[1]
(b) · · Ci:1lctilate the number of moles of N 2(g), H2<.sl and NH3(g) at
equilibri tEn
..
H2
Nl h
[3]
(c) .
Given.that the equilibrium constant at 400 K is 40.7 atm -2, calculate
the total pressure.
[3]
[Total: 7]
9189/2 N2014
. ,.
., .
3
2
(a)
For
I Bxaminm'1
Ute
Define the tFJ1m standard electrode potential.
----'---------------- ·····t1j
(b)
The standard electrode potentials for two half cells are given below
s 20!- + 2e- � 2So�Ag• +e-
(i)
� Ag
E 8 = + 2.01 V
E 0 =+0.80V
State the three:�onditions for which the term standard refers.·:
1.
,, .
2.
3.
(ii)
Write down a c4emical equation for the overall reaction of the
·
cell.
(iii)
Calculate the cell potential, E 0 cell, for the reaction.
(iv)
Sketch a diagram of the peroxodisulphate half cell.
I
'4 .
[7].
,.
9189/2 N2014
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4
(c)
For
Examiner's
Use
State and explain, the effect, on the magnitude of E fJ cell of adding
+
concentrated ammonia to the _Ag ;Ag half cell.
effect:
explanation:
(3]
[Total: 11 J
3
�
.
Sulphur dioxide is a poisonous gas with adverse environmental effects.
·;
(a)
(i)
Giv_e any one source of sulphur dioxide.
(ii)
State any two adverse effects of sulphur dioxide on the environment.
l..
2.
,._
(iii) . , E,xplain how sulphur dioxide preserves food.
[4]
.
I
9189/2 N2pl4
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(b)
Sulphur dioxide ,::-ari be converted to sulphuric acid by the contact process. Tlle·
·, reaction is
For
Bxan1tncr1
Use
Give reasons for
(i)
cooling fae reaction mixture,
., '
11
·i
(ii)
using'ti bw pressure· even though high pressur� produces a h;gh
yield,
----·---:-----------------:--., .
(ill)
pumpin�; an excess of air.
(iv)
usiri� vanadium (V) oxide.
[4]
[Total: 8]
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·•
91.".9/2 N2014
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6
Ethylamine can be prepared from chloromethane as shown.
(a)
(i)
I
For
Blaorincn
Use
,State the reage.n.t� :md conditi0 "'; for steps I and JI.
..
;rtep I: feagent ________________.;__
condition(s) ________________
step II: reagent ________________
condition(s) -------.....-----------'-
'.
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:; 11
\),'
Draw Jhe displayed structural formula of the intennediate A.
[5].
Dimethylamine and ethylamine are isomers. Give the structural
formulae of the two isomers .
. :: (ii)
..
.���plain.why
dimethylamin
� is more basic than ethylamine ..
.
.
t
(3)
9189/2 N20!4
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.7
State any two industrial uses of halogenated hy.drocarbons.
(i)
(c)
' ..
1.
.•
l'a
Be:reiF
2
ul
(ii)
Dei1cribe the environmental consequences of the up.controlled
use of halogenated compounds.
., .
[4}'.-''.
[To�l: 12]
5: ;"_,
Fig.5 shows the structure of fluorescamine, a reagent for the detection of primary__ .
amines.
0
Fig.5
(a)
Identify any two functional groups present in this compo�d.
1.
2.
(b)
[21
Draw the structure of the organic product formed when fluorescamine
reacts with
(i)
NaOH under reflux,
9189/2 N2014
8
For
(ii)
Use
(iii)
Br2 in the presence of FeBr 3,
(iv)
hot concentrated KMn04.
I•
.
[4]
(c)
Suggest explanations for the following observations:
(i)
hexanedioic acid and 1,6-diaminohexane are forme,f when sulphuric
acid is added to a fabric made of ny lon-6,6
(ii)
terylene is a better sweat absorber than nylon-6,6,
,rr,
. ./(.'111,
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commercial fertilisers use urea, NH2CONH2 , to promote plant
growth
[4]
[Total: 10]
9!89/2 N2014
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ZIMBABWE. SCHOOL EXAMINATIONS COUNCIL.·
General Certificate of Education Advanced Level
CHEMISTRY
PAPER 3
Multiple Choice
9189/3
NOVEMBER 2014 SESSION
Additional materials:
Data Booklet
· Mathematical tables and/or calculator
Multiple Choice answer sheet
Soft clean eraser
Soft pencil (type B or HB is recommended)
TIME
1 hour
1 hour
.
JNSTRUCTIONS TO CANDIDATES
Do not open this booklet until you are told to do so.
Wnte your name, Centre number and candidate number on the answer sheet in the spaces provided
unless this has already been done for you.
Thi::re arc forty questions in this paper. Answer all questions. For each question, there are four
possible answers, A, B, C and D. Choose the one you consider correct and rec\..?d your choice in
soft pencil on the separate answer sheet.
Read ·very carefully the instructions on the answer sheet.
lNJi'ORMATION FOR CANDIDATES.
Ft1cb correct answer will score one mark. A·inark will not be deducte_d for a wrong answer.
i\.ny rough working should be done in this booklet.
l"
This question paper consists of 15 printed pages and 1 blank page.
Copyright: Zimbabwe School Examinations Council, N2014.
'1SECN20l4
[Turn over,
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1()
2
r
Section A
Choose the one you consider to
D.
and
C
B,
A,
rs,
we
ans
ble
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_-::_._... .: .:::, question there are four po
r·or the reaction,
the conjugate acid-base pair is
NI-h and CH3O - .
CI-hOH and CH 3O-.
CH3 OH and NH;.
NH; and CH 3O-.
A
B
C
D
:l
Which statement is correct about real gases?
A
B
C
D
3
Van der Waals forces are significant at low pressure;,
They approach ideality at high temperatures.
They approach ideality at low temperature...They approach ideality at high pressure."
Ethanoic acid ionises according to the following equa_tion:
te to
What is the effect of adding sodium ethanoa
A·
B
C
D
the system?
Ka remains constant
· [CH3 COOH] decreases
Ka increases
Ka decreases
If
9189/3 N20l4
3
..
The diagram: shows an electrochemical cell.
T=298 K
P::::l atrn
Cl�
T=298 {:
P=l atm
2(a> ---.
+---+-- Pt electrode .
lMHC/
---lMFe· /Ft
Pt electrode
Wh2J is the direction of electron flow?
Fe2+ - C/2
Fe3+. -+.·ct2·:
cr-Fe2+
· Cli-Fe2 +
A
n
n
C
D
5
Initial rates at 25 °C for various initial concentrations for the reaction
2 [Fe( CN) 6
r-
Rate moldm - 3 s - 1
+ 21 - - 2 [Fe( C\) 6
r-
+hare shown in the table.
[Fe(CN).,r- moJ/dni3 [Fe( CN)6
·h
1
·1-·· .
4
1
2·
.
r-
1 ..
. 2 <.. '
1 ..
4
What is the order ofreaction with respect to, [Fe(CN)6}
4
[Fe(CN)J
A
B
,___
0
2
C
0
2
�--
6
-
mo1/dm3
-,
[Fe{CN)6
[Fe(CN),r-
r
l
1
-2
2
1
0
. 1 .
0
.-
...
[r ]mo1/dm3
'
r-
,,
,. ,
1
1
1
and 1-7
\Vhat is the pH of a buffer solution containing 0.1 M boric acid and
borax?
·· 02·¥
·- ·
3
-to
(Ka boric acid = 5 .8 x 10 moldm - )
A
B
C
D
9.5
8.9
7.9
7.5
9189/3 N2014
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...
•
4
,,.�..
A silver ion solution is subjected to a current of4 amperes for 1 hour 30 minutes.
'
'
.
How much silver is deposited on the cathode?
A
0.40 g'
B
24.17 g
C
39.71 g
D
28 950 g
...
Which graph represents the pH change when 1 moldni -3 ethanoic acid is added to 25 cm3 of ·
1 moldm -3 sodium hydroxide?
8
.·B
14
A 1
4
pH
pH
7
7
.
25 cm3 .
volume ofCH 3 COOH
25 cm3
volume ofCH 3 COOH
D 14
C 1
4
pH
pH
•
7
25 cm3
volume of CH 3 COOH
9
I
25 cnr
volume ofCH 3 COOH
A mass of 4.87 g ofNa2CO3 .nH2O were dissolved in 250 crri3'ofwater. 25 cm3 ofthis:
solution required 34 cm3 of 0.1 M HCZ for neutralisation. · • .. · ·
The value of n is
A
B
C
D
7.
8.5.
9.
10.
9189/3 N2014
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5
Which electronic configuration shows the element which is isoelectronic with'FeH?
A
1s 22s22p6 3s23p63d 9 4s2
n
ls 22s2 2p63s2 3p6 3d3 4s2 :
·
1s22s2 2p63s2 3p63d44s\
D
11
Which carbonate is most stable to heat?
A.
H
C
I)
12
:n
off white precipitate, soluble in aqueous ammonia
white precipitate, soluble in aqueous ammonia
white precipitate, insoluble in aqueous ammonia
off white precipitate, insoluble in aqueous ammonia .. •
·which is true about a catalyst?
A,
It
C
D
_;, •�1
Electrode potential increases do\\n the group. •
, Reactivity with water decreases dov.n the group.
· First ionisation energy increases down the group.
Reactivity with oxygen iQcreases down the group.
Which observations are correct when potassium chloride reacts with aqueous silver ions
followed by aqueous ammonia? •
A
H
C
D
:' :'i
all are weakly electropositive
may use penultimate shell for valency
all show variable valency
they form coloured compounds .
Which is the correct trend for Group (II) metals?
A
:El,
C
D
14
barium carbonate
strontium carbonate
calcium carbonate
magnesium carbonate
Which statement is not true of typical transition elements?
A
U
C
13
1s22s2 2p6 3s2 3p64�94st/
initiates the reaction
does not alter amounts of products fonned
increases amounts of products formed
increases activation energy of existing path
The use of chlorofluorocarbons is being discouraged because they
A
R
C
n
I
are inert and cannot be broken down.
do not oxidise in the atmosphere.
decompose to produce chlorine atoms.
fonn oxides of chlorine.
9189/3 N2014
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6
17
The thermal stability of hydroge_n halides depends on the .
A
B
C
D
18
+
�
j·
t,--·
l1,
I
!:,
ftt
.,.
reduces chlorine to chloride ions
+
oxidises Sn4
highly reducing
oxidises chloricfe ions to chlorine
Which oxide is amphoteric
A
B
C
D
20
strength ofVan·der Waals forces.
hydrogen bonding between molecules.
lattice energy of the compound.
bond dissociation enthalpy.
Which is true about Pb4 ion?
A
B
C
D
i9
•
lead (II) oxide
silicon (IV) oxid�
lead (IV) oxide
tin (IV) oxide
Which compound can exhibit cis-trans isomerism?
A
C6HsCHCH2
B
C6HsCHC}I(CH3)
C
CH3CH2CHC(CH3)C6Hs
D
C6HsCHCH(CH2CH2CH3)
.,
•
;�-
1··
1...�
,�1.
.
.
9189/3 N2014
7
21
Nootkatone, a substance extracted from grapefruit oil has the following structure .
. ''
. i
0
Nootkatone
How many chiral centres are in Nootkatone?
A
B
C
D
22
5
4
3
2
The IUPAC name of the following organic compound is
CH3C({;:H3)2CH2<;H(G,iHs)CH2�H3
.
.
A
B
C
D
:_:
i
: i
; .
23
.. "-r
•·,..,-,-. "")
- 2,2-dimethyl-4-ethylhexane ,,
4-ethyl-6,6-dimethylhexane
2,2-dimethyl-4-propylh.exane
3-propyl-5,5-dimthylhexane
Which isomer has the highest boiling point?
..
A
(CH3)3CCH2CH2CH3 )) ·
B·
CH3CH(CH3)CH(CH3)CH2CH3
•
I .
·_ .
I
C
9189/3 N2014
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.:-4
Dry chlorine is passed slowly into boiling methylbenzene wl�ich is irrad°iated Vv:th i:l..'1
ultraviolet light.
What is the structure of the main product?
A
Cl
Cl
DCl�CJ
Cl
:
,,
25
Which statement is true about amino acids?
A
B
C
D
They are neutral in aqueous solution.
In aqueous alkali, the zwitterion is cationic.
They are amphoteric.
In acidic media, the zw itterion is dipolar.
''
,'(
,j; ..
9189/3 N2014
11
Qiana is a polyamidc fibre with the following structure.
�
"t
I
'
.
:.\
(CH2)6-C1NH-OCH,-O-NH
r
Qiana
!
�
What are the monomer units used in its synthesis?
B
C
D
29
Ethanol was oxidised by an excess tf hot acidified sodium dichromate (VI). The mixture
was then distilled and aqueous sodium carbonate was added to the distillate.
The correct observations made were
A
B
C
D
a colourless distillate and gas bubbles.
a green distillate and gas bubbles.
a colourless distillate only.
a green distillate only.
Ethanoic acid boils at 118 °C but its ethylester, ethyi:ethanoate, boils at 77 °C.
\Vhy is the boiling point of the acid higher though it has a lower molecular weight?
A
B
C
D
There are stronger Van der Waals forces in the acid.
There is hydrogen bonding in the acid.
There are weaker covalent bonds in the ester.
Esters are more volatile than acids.
9189/3 N20l4
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13
Which molecule(s) has/have a pyramidal shape?
2.
34
35
36
37
The maximum oxidation state shown by a Group (VII) e�ment is
1.
equal to the valency electrons.
2.
the sum of s and p �lectrons.
3.
the same as group number..
Going down Group (IV),
1.
basicity of elements increases.
2.
monoxides change from neutral to amphoteric. ·
3.
the stable oxidation state becomes +4.
· In homogeneous catalysis
1.
catalyst forms intermediate compound(s) which react(s) read: 1 v. ·
2.
catalysts are unchanged at the end of reaction.
3.
reactants adsorb onto the catalyst surface. ·
Which statement(s) is/are correct about the benzene molecule?
1.
. It is planar and symmetrical.
2. ·
· Carbon Carbon bond angles are 120 ° .
3.
:\8
i.
Carbon Carbon bond lengths are the same.
Which reagent(s) can be used to distinguish between ethanol and ethanoic acid?
1.
. alkaline aqueous iodine
2.
sodium hydrogen carbonate
3.
phosphorous pentachloride
9189/3 N2014
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15
Compound Xis refluxed with ethanol to form Y.
CompoundX
Br
What structure( s) represent( s) Y?
1
2
i.
"·f-.':
i
3
OH
9189/3 N2014
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