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FOR EXAMINER’S USE
1
2
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6
TOTAL
CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education
CHEMISTRY 0620/02
Paper 2May/June 2003
1 hour Candidates answer on the Question Paper.No Additional Materials required
Centre Number Candidate Number Name
READ THESE INSTRUCTIONS FIRST
Write your name, centre number and candidate number in the spaces provided at the top of this page.Write in dark blue or black pen in the spaces provided on the Question Paper.You may use a pencil for any diagrams, graphs or rough working.Do not use staples, paper clips, highlighters, glue or correction fluid.
Answer all questions.The number of marks is given in brackets [ ] at the end of each question or part question.A copy of the Periodic Table is printed on page 16.
If you have been given a label, look at thedetails. If any details are incorrect ormissing, please fill in your correct detailsin the space given at the top of this page.
Stick your personal label here, ifprovided.
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0620/02 M/J/03
1 The diagram shows part of the Periodic Table.
(a) Answer these questions using only the elements shown in the diagram.
Write down the symbol for an element which
(i) is a transition metal.
(ii) forms an acidic oxide.
(iii) has six electrons in its outer shell.
(iv) has a giant covalent structure.
(v) reacts rapidly with water.
(vi) has a higher proton (atomic) number than iron.
[6]
ForExaminer’s
Use
LiNa
Fe Cu Zn
C N O F NeHe
S ClBr
ArKrK
I II III IV V VI VII 0
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Fe
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C
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O
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C
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Li
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Cu
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0620/02 M/J/03 [Turn over
(b) Some uses of some non-metallic elements are show below.
Draw lines between the boxes to link the elements to their correct uses.
The first one has been done for you.
element use
[4]
(c) The structures of some halogen compounds are shown below.
2 These cannot move in the solid but are free to move in liquid.
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when or
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molten. or
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5
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0620/02 M/J/03
2 A student investigates the reaction between zinc and hydrochloric acid. The hydrochloric acid is in excess. The student uses the apparatus shown in the diagram.
(a) What should the student do to start the reaction?
(c) The student does the experiment again.The only difference is that the student uses warm, rather than cold, hydrochloric acid. On the grid, draw the shape of the graph you would expect for theexperiment with the warm hydrochloric acid.
[2]
.
0 1
10
20
30
40
50
60
2 3 4 5 6 7
time /min
volu
me
of g
as/c
m3
ForExaminer’s
Use
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no more gas produced / reaction has stopped all zinc used up a
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0620/02 M/J/03
(d) (i) Balance the equation for the reaction between zinc and hydrochloric acid.
Zn + … HCl → ZnCl2 + H2
(ii) Name the compound which has the formula ZnCl2.
evaporation or boiling or vaporisation (NB liquid -> gas)
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freezing or solidification (NB liquid to solid)
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condensing or condensation or liquefaction (NB gas to liquid)
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I A
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2 You need to heat a liquid to boil it that is supply energy or energy is needed to overcome the forces that hold the particles together in the liquid state.
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0620/02 M/J/03
(d) Choose from the following list of substances to answer the questions below.
brominechlorine
ironmercury
sodium chloridesulphur
Name a substance which is
(i) a gas at room temperature. ......................................................................................
(ii) a non-metallic liquid at room temperature. ...............................................................
(iii) a compound which is a solid at room temperature. ...................................................[3]
(e) A student set up the apparatus shown in the diagram below.
The white solid is formed because the molecules of hydrogen chloride gas andammonia gas move at random throughout the tube and eventually react with each other.
(i) State the name given to this random movement of molecules.
ammonia diffuses or moves faster or hydrogen chloride diffuses more slowly or molecules of ammonia and hydrogen chloride
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move at different speeds or ammoniia molecules are lighter than hydrogen chloride.
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neutralisation or acid/base
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0620/02 M/J/03 [Turn over
(g) The diagram below shows a simple apparatus that can be used for measuring themelting point of a solid. The liquid in the beaker is heated slowly and the temperature at which the solid B meltsis recorded.
(i) State the name of the piece of apparatus labelled A.
(ii) Solid B melted at 155oC. Why would water not be a suitable liquid to put in the beaker when using thisapparatus to find the melting point of solid B?
To ensure all liquid at the same temperature or so that tube is at the same temperature as thermometer
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0620/02 M/J/03
4 Catalytic cracking is carried out by oil companies to produce high grade petrol. The process is carried out using an aluminium oxide catalyst. The reaction is a type of thermal decomposition.
5 A precipitate may be formed when two aqueous solutions are mixed. The colour of theseprecipitates may be used to identify particular aqueous ions.
(a) Complete the following table.
[8]
H
H
C
H
H
C
H
H
C
H
H
C+ →
ForExaminer’s
Use
solution to be added to ion under test test for the ion colour of precipitate
iron(II)
iodide
chloride
sulphate
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C H
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2 4
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H
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2
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H H H H
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C C C C
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H H H H
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or -CH -CH -CH -CH
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addition
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sodium hydroxide or aqueous ammonia
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green or green-grey precipitate
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silver nitrate or lead nitrate
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yellow precipitate yellow precipitate
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silver nitrate
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white precipitate
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barium chloride/nitrate
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white precipitate
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0620/02 M/J/03
(b) When a solution of iron(III) chloride is added to a solution of sodium hydroxide, aprecipitate of iron(III) hydroxide is formed and sodium chloride remains in solution.
Explain how you would obtain a pure dry sample of sodium chloride from this mixture.You may use diagrams to help with your explanation.
[3]
(c) Sodium chloride and iron(III) hydroxide are both compounds.Explain the meaning of the term compound.
(c) Uranium is between magnesium and zinc in the reactivity series.
Equal sized strips of magnesium, uranium and zinc were placed in hydrochloric acid.The hydrochloric acid was the same concentration. The results are shown in the table.
(i) Complete the result for uranium and hydrochloric acid.
(ii) Uranium has several isotopes which are radioactive.One of these isotopes is uranium – 235 (235U).
loses two electrons or loses its valency electrons or forms
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Mg by losing electrons
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+
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0620/02 M/J/03
Gro
up
DA
TA S
HE
ET
Th
e P
erio
dic
Tab
le o
f th
e E
lem
ents
140
Ce
Cer
ium
58
141
Pr
Pra
seod
ymiu
m
59
144
Nd
Neo
dym
ium
60
Pm
Pro
met
hium
61
150
Sm
Sa
ma
riu
m
62
152
Eu
Eur
opiu
m
63
157
Gd
Gad
olin
ium
64
159
Tb
Terb
ium
65
162
Dy
Dys
pros
ium
66
165
Ho
Hol
miu
m
67
167
Er
Erb
ium
68
169
Tm
Thu
lium
69
173
Yb
Ytte
rbiu
m
70
175
Lu
Lute
tium
71
232
Th
Tho
rium
90
Pa
Pro
tact
iniu
m
91
238 U
Ura
nium
92
Np
Nep
tuni
um
93
Pu
Plu
toni
um
94
Am
Am
eric
ium
95
Cm
Cur
ium
96
Bk
Ber
keliu
m
97
Cf
Cal
iforn
ium
98
Es
Ein
stei
nium
99
Fm
Fer
miu
m
100
Md
Men
dele
vium
101
No
Nob
eliu
m
102
Lr
Law
renc
ium
103
1 HH
ydro
gen
1
7 Li
Lith
ium
3
23 Na
Sod
ium
11
24 Mg
Mag
nesi
um
12
40 Ca
Cal
cium
20
45 Sc
Sca
ndiu
m
21
48 Ti
Tita
nium
22
51 VV
anad
ium
23
52 Cr
Chr
omiu
m
24
55 Mn
Man
gane
se
25
56 Fe
Iron
26
59 Co
Cob
alt
27
59 Ni
Nic
kel
28
64 Cu
Cop
per
29
65 Zn
Zin
c
30
70 Ga
Gal
lium
31
27 Al
Alu
min
ium
13
11 BB
oron
5
12 CC
arbo
n
6
14 NN
itrog
en
7
16 OO
xyge
n
8
19 FF
luor
ine
9
28 Si
Sili
con
14
31 PP
hosp
horu
s
15
32 SS
ulph
ur16
35.5
Cl
Chl
orin
e17
40 Ar
Arg
on18
20 Ne
Neo
n10
4 He
Hel
ium
2
73 Ge
Ger
man
ium
32
75 As
Ars
enic
33
79 Se
Sel
eniu
m
34
80 Br
Bro
min
e
35
84 Kr
Kry
pton
36
39 KP
otas
sium
19
88 Sr
Str
ontiu
m
38
89 YY
ttriu
m
39
91 Zr
Zirc
oniu
m
40
93 Nb
Nio
bium
41
96 Mo
Mol
ybde
num
42
Tc
Tech
netiu
m
43
101
Ru
Rut
heni
um
44
103
Rh
Rho
dium
45
106
Pd
Pal
ladi
um
46
108
Ag
Silv
er
47
112
Cd
Cad
miu
m
48
115
In Indi
um
49
119
Sn
Tin
50
122
Sb
Ant
imon
y
51
128
TeTe
lluriu
m
52
127 I
Iodi
ne
53
131
Xe
Xen
on
54
137
Ba
Bar
ium
56
139
La
Lant
hanu
m
57*
178
Hf
Haf
nium
72
181
TaTa
ntal
um
73
184
WTu
ngst
en
74
186
Re
Rhe
nium
75
190
Os
Osm
ium
76
192 Ir
Irid
ium
77
195
Pt
Pla
tinum
78
197
Au
Gol
d
79
201
Hg
Mer
cury
80
204
Tl
Tha
llium
81
207
Pb
Lead
82
209
Bi
Bis
mut
h
83
Po
Pol
oniu
m
84
At
Ast
atin
e
85
Rn
Rad
on
86
Fr
Fran
cium
87
227
Ac
Act
iniu
m
89
†
9 Be
Ber
ylliu
m
4
III
IIIIV
VV
IV
II0
85 Rb
Rub
idiu
m
37
133
Cs
Cae
sium
55
226
Ra
Rad
ium
88
The
vol
ume
of o
ne m
ole
of a
ny g
as is
24
dm3
at r
oom
tem
pera
ture
and
pre
ssur
e (r
.t.p.
).
a Xb
a =
rel
ativ
e at
omic
mas
s
X=
ato
mic
sym
bol
b =
pro
ton
(ato
mic
) nu
mbe
r
Key
* 58-
71 L
anth
anoi
d se
ries
†90-
103
Act
inoi
d se
ries
Summary of Examiner’s Notes in IGCSE Chemistry Paper 2 June 2003
Page: 2 Q1 (a) i Any one from Fe, Cu and Zn Q1 (a) ii Most non-metals except hydrogen and noble gases Q1 (a) iii an element in Group VI, O, S Q1 (a) iv Only carbon in table above Q1 (a) v Metals in Group I Li, Na and K Q1 (a) vi Any element in the same period as Fe and to the right of it Cu, Zn, Br, Kr
Page: 3 Q1 (b) (oxygen) oxygen supports respiration Q1 (b) (carbon) because of its layer structure graphite is slippery Q1 (b) (in light bulbs) Argon is inert, it does not react with filament Q1 (b) (in balloons) Helium is less dense than air
Page: 4 Q2 need to answer a Q2 You are told that hydrochloric acid is in excess therefore all the zinc will
react Q2 (b) i All points plotted correctly scores 2 -1 per mistake or omission
Page: 5 Q2 (b) i NB every square = 1 cm³ Q2 (b) ii Smooth curve and through origin (0, 0) Q2 (c) The reaction will go faster but because the amounts of chemicals are the
same it will produce the same final volume of gas. Faster initial rate (steeper slope initially) through (0, 0) ends up at 55cm³
Page: 6 Q2 (d) I x Zn + 2 x Cl + 2 x H atom Need to multiply HCI by 2. Balance hydrogen and chlorine atoms Q2 (d) iii Remember the '2' only multiplies the chloride. Use relative atomic mass 65 Zn i.e. is 65 for zinc. 30
Q2 (e) Other acceptable definitions are: Substance containing only one type of atom. Substance that cannot be broken down to any other substance by
chemical means. This is essential to gain mark. Common mistake - an element is a pure substance, as compounds can be pure, e.g. you can have pure water but it contains two elements
so it is a compound.
Page: 7 Q3 To avoid mistakes label diagram Q3 (a) ii NOT fusion Q3 (b) Do NOT be tempted to tick more than one box. Q3 (b) This refers to solid when the molecules can only vibrate about their
position.
Q3 (b) They are close together but can move past each other - so sliding over each other is a good description.
Q3 (b) This relates to gases where the molecules are far apart and the inter-
molecular forces are very weak
Page: 8 Q3 (d) ii bromine and mercury are both liquids at room temperature but mercury
is a metal Q3 (d) iii in fact it is the only compound; all the others are elements Q3 (e) ammonia molecules have moved further in the same time Q3 (e) Hydrogen chloride molecules move more slowly and travel less distance, so
they meet and react nearer the hydrogen chloride end. Q3 (e) i NOT Brownian motion Q3 (e) ii ammonia chloride is wrong Q3 (e) iii They would only meet in the middle if the molecules moved at the same
speed. Q3 (e) iii The best answer is: ammonia molecules are lighter than hydrogen chloride molecules so
they move/diffuse faster
Page: 9 Q3 (g) ii Must refer to melting point of solid to gain mark. Q3 (g) ii NOT boiling point of water is only 100°C
Page: 10 Q4 (a) ii Idea of increasing rate is essential. NOT alters or changes rate. Q4 (b) Cn H2n + 2 alkane Q4 (b) CnH2n alkene Q4 (c) greatest amount of petrol per 100g Q4 (c) ii Must have units
Page: 11 Q4 (c) iii ethene Q4 (c) iii hydrogen Q4 (d) i Must show continuation Q4 (d) ii Only one product, monomers adds to produce a single product
Page: 12 Q5 (b) NOT decant Q5 (b) NOT just filtrate Q5 (d) i NOT chloride '2' is essential Q5 (d) ii Anode is + electrode, CL¯ attracted, becomes chlorine gas Cathode is - electrode, Na+ attracted, becomes sodium metal
Page: 13 Q6 (a) K is potassium Q6 (b) A specific comment is needed, NOT a general comment - 'they did not
have the right technology' Q6 (c) i any statement that indicates that the reactivity is between magnesium and
aluminium Q6 (c) ii 'Atoms' is essential; not molecules or compounds Q6 (c) ii The best answer is; isotopes are atoms of the same element which have the same proton
number but different nucleon numbers
Page: 14 Q6 (d) a correct formula MgO is acceptable Q6 (e) ii Must be a specific reason. You are advised to select just one reason (only one mark) and do not offer
a list. Q6 (e) ii NOT to improve properties; NOT cheaper; NOT higher melting point Q6 (f) Explanations based on oxidation number and electron transfer would be
acceptable but the above is a simple and clear answer. Q6 (g) ii Answer marked as correct limits 76 → 80%
Page: 15 Q6 (h) i You have to give a diagram as requested in the