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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS
International General Certificate of Secondary Education
*6703363366*
0620/03
CHEMISTRY
May/June 2007
Paper 3 (Extended)
1 hour 15 minutes
Candidates answer on the Question Paper.
No Additional Materials required.
READ THESE INSTRUCTIONS FIRST
Write your Centre number, candidate number and name on all the work you hand in.
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.
DO NOT WRITE IN ANY BARCODES.
Answer all questions.
A copy of the Periodic Table is printed on page 16.
At the end of the examination, fasten all your work securely together.
The number of marks is given in brackets [ ] at the end of each question or part
question.
For Examiner's Use
1
2
3
4
5
6
7
Total
This document consists of 14 printed pages and 2 blank pages.
IB07 06_0620_03/4RP
© UCLES 2007
[Turn over
2
1
A major source of energy is the combustion of fossil fuels.
For
Examiner's
Use
(a) (i) Name a solid fossil fuel.
[1]
(ii) Name a gaseous fossil fuel.
[1]
(b) Petroleum is separated into more useful fractions by fractional distillation.
(i) Name two liquid fuels obtained from petroleum.
and
[2]
(ii) Name two other useful products obtained from petroleum that are not used as
fuels.
and
[2]
(iii) Give another mixture of liquids that is separated on an industrial scale by fractional
distillation.
[1]
[Total: 7]
© UCLES 2007
0620/03/M/J/07
3
2
Complete the following table.
type of
structure
particles present
electrical
conductivity
of solid
ionic
positive and negative
ions
poor
atoms of two different
elements in a giant
covalent structure
poor
and
good
macro
molecular
metallic
electrical
conductivity of
liquid
For
Examiner's
Use
example
poor
copper
[Total: 6]
© UCLES 2007
0620/03/M/J/07
[Turn over
4
3
There are three methods of preparing salts.
For
Examiner's
Use
Method A – use a burette and an indicator.
Method B – mix two solutions and obtain the salt by precipitation.
Method C – add an excess of base or a metal to a dilute acid and remove the excess by
filtration.
For each of the following salt preparations, choose one of the methods A, B or C, name any
additional reagent needed and then write or complete the equation.
(i) the soluble salt, zinc sulphate, from the insoluble base, zinc oxide
method
reagent
word equation
[3]
(ii) the soluble salt, potassium chloride, from the soluble base, potassium hydroxide
method
reagent
equation
→ KCl + H2O
+
[3]
(iii) the insoluble salt, lead(II) iodide, from the soluble salt, lead(II) nitrate
method
reagent
equation Pb2+ +
→
[4]
[Total: 10]
© UCLES 2007
0620/03/M/J/07
5
4
Use your copy of the periodic table to help you answer these questions.
For
Examiner's
Use
(a) Predict the formula of each of the following compounds.
(i)
barium oxide
[1]
(ii)
boron oxide
[1]
(b) Give the formula of the following ions.
(i)
sulphide
[1]
(ii)
gallium
[1]
(c) Draw a diagram showing the arrangement of the valency electrons in one molecule of
the covalent compound nitrogen trichloride.
Use x to represent an electron from a nitrogen atom.
Use o to represent an electron from a chlorine atom.
[3]
(d) Potassium and vanadium are elements in Period IV.
(i) State two differences in their physical properties.
[2]
(ii) Give two differences in their chemical properties.
[2]
© UCLES 2007
0620/03/M/J/07
[Turn over
6
(e) Fluorine and astatine are halogens. Use your knowledge of the other halogens to
predict the following:
(i) The physical state of fluorine at r.t.p.
The physical state of astatine at r.t.p.
[2]
(ii) Two similarities in their chemical properties
[2]
[Total 15]
© UCLES 2007
0620/03/M/J/07
For
Examiner's
Use
7
5
(a) Titanium is produced by the reduction of its chloride. This is heated with magnesium in
an inert atmosphere of argon.
TiCl4 + 2Mg → Ti + 2MgCl2
(i) Explain why it is necessary to use argon rather than air.
[1]
(ii) Name another metal that would reduce titanium chloride to titanium.
[1]
(iii) Suggest how you could separate the metal, titanium, from the soluble salt magnesium
chloride.
[2]
(b) Titanium is very resistant to corrosion. One of its uses is as an electrode in the cathodic
protection of large steel structures from rusting.
power
+
–
steel oil rig
which is cathode
titanium
anode
sea water contains
H+(aq), OH–(aq),
Na+(aq), Cl–(aq)
(i) Define oxidation in terms of electron transfer.
[1]
(ii) The steel oil rig is the cathode. Name the gas formed at this electrode.
[1]
(iii) Name the two gases formed at the titanium anode.
and
[2]
(iv) Explain why the oil rig does not rust.
[2]
© UCLES 2007
0620/03/M/J/07
[Turn over
For
Examiner's
Use
8
(v) Another way of protecting steel from corrosion is sacrificial protection.
Give two differences between sacrificial protection and cathodic protection.
For
Examiner's
Use
[2]
[Total: 12]
© UCLES 2007
0620/03/M/J/07
9
6
Aluminium is extracted by the electrolysis of a molten mixture that contains alumina, which
is aluminium oxide, Al2O3.
(a) The ore of aluminium is bauxite. This contains alumina, which is amphoteric, and
iron(III) oxide, which is basic. The ore is heated with aqueous sodium hydroxide.
Complete the following sentences.
The
The
dissolves to give a solution of
does not dissolve and can be removed by
[4]
(b) Complete the labelling of the diagram.
waste gases
carbon anode (+)
.......................
mixture of aluminium
....................... (–)
oxide and .........................
................................
temperature is .........................
[4]
(c) The ions that are involved in the electrolysis are Al3+ and O2-.
(i) Write an equation for the reaction at the cathode.
[2]
(ii) Explain how carbon dioxide is formed at the anode.
[2]
© UCLES 2007
0620/03/M/J/07
[Turn over
For
Examiner's
Use
10
(d) Give an explanation for each of the following.
For
Examiner's
Use
(i) Aluminium is used extensively in the manufacture of aircraft.
[1]
(ii) Aluminium is used to make food containers.
[2]
(iii) Aluminium electricity cables have a steel core.
[1]
[Total: 16]
© UCLES 2007
0620/03/M/J/07
11
7
Esters, fats and polyesters all contain the ester linkage.
For
Examiner's
Use
(a) The structural formula of an ester is given below.
H
H
C
O
C
H
O
H
H
H
H
C
C
C
C
H
H
H
H
H
Name two chemicals that could be used to make this ester and draw their structural
formulae. Show all bonds.
names
and
[2]
structural formulae
[2]
(b) (i) Draw the structural formula of a polyester such as Terylene.
[2]
(ii) Suggest a use for this polymer.
[1]
© UCLES 2007
0620/03/M/J/07
[Turn over
12
(c) Cooking products, fats and vegetable oils, are mixtures of saturated and unsaturated
esters.
The degree of unsaturation can be estimated by the following experiment. 4 drops of
the oil are dissolved in 5 cm3 of ethanol. Dilute bromine water is added a drop at a time
until the brown colour no longer disappears. Enough bromine has been added to the
sample to react with all the double bonds.
mass of saturated fat in
100 g of product / g
mass of
unsaturated fat in
100 g of product / g
number of drops of
bromine water
margarine
35
35
5
butter
45
28
4
corn oil
10
84
12
soya oil
15
70
10
lard
38
56
cooking
product
(i) Complete the one blank space in the table.
[1]
(ii) Complete the equation for bromine reacting with a double bond.
C
C
+ Br2
[2]
(iii) Using saturated fats in the diet is thought to be a major cause of heart disease.
Which of the products is the least likely to cause heart disease?
[1]
© UCLES 2007
0620/03/M/J/07
For
Examiner's
Use
13
(d) A better way of measuring the degree of unsaturation is to find the iodine number of the
unsaturated compound. This is the mass of iodine that reacts with all the double bonds
in 100 g of the fat.
Use the following information to calculate the number of double bonds in one molecule
of the fat.
Mass of one mole of the fat is 884 g.
One mole of I2 reacts with one mole
C
C
.
The iodine number of the fat is 86.2 g.
Complete the following calculation.
100 g of fat reacts with 86.2 g of iodine.
884 g of fat reacts with
g of iodine.
One mole of fat reacts with
moles of iodine molecules.
Number of double bonds in one molecule of fat is
[3]
[Total:14]
© UCLES 2007
0620/03/M/J/07
For
Examiner's
Use
14
BLANK PAGE
0620/03/M/J/07
15
BLANK PAGE
Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where
possible. Every reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance
have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity.
University of Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of
University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.
0620/03/M/J/07
© UCLES 2007
Magnesium
Sodium
Calcium
0620/03/M/J/07
Strontium
Key
b
X
a
b = proton (atomic) number
X = atomic symbol
a = relative atomic mass
*58-71 Lanthanoid series
90-103 Actinoid series
Actinium
Ac
89
Ra
Radium
88
Fr
Francium
87
*
Hafnium
72
Lanthanum
57
178
Hf
40
Zirconium
Zr
91
Titanium
139
Yttrium
22
48
Ti
La
39
Y
89
Scandium
21
227
Barium
56
Caesium
45
Sc
226
55
137
Ba
133
Cs
38
Rubidium
37
88
Sr
85
Rb
20
Potassium
19
40
Ca
39
12
24
Mg
23
Na
Beryllium
4
Lithium
K
11
3
9
Be
7
II
Li
I
51
93
Ta
181
Niobium
Nb
90
58
73
52
96
Mo
W
184
Protactinium
Thorium
55
Tc
186
Re
144
Nd
92
60
Uranium
U
238
Neodymium
75
Rhenium
43
Technetium
25
Manganese
Mn
27
59
28
59
29
64
30
65
5
Ru
101
Iron
190
Pm
Osmium
Os
Np
93
Neptunium
61
Promethium
76
44
Ruthenium
26
56
Fe
Sm
150
Iridium
Pu
94
Plutonium
62
Eu
152
Platinum
Am
95
Americium
63
Europium
78
195
Pt
Ir
46
Palladium
Pd
106
Nickel
Ni
192
Samarium
77
45
Rhodium
Rh
103
Cobalt
Co
Gd
157
Gold
Au
197
Silver
96
64
Curium
Cm
Gadolinium
79
47
Ag
108
Copper
Cu
201
Bk
Terbium
Tb
159
Mercury
Hg
97
Berkelium
65
80
48
Cadmium
Cd
112
Zinc
Zn
11
6
Dy
162
Thallium
Tl
204
Indium
Cf
98
Californium
66
Es
Holmium
Ho
165
Lead
Pb
207
Tin
99
Einsteinium
67
82
50
119
Sn
115
32
Germanium
Ge
73
Silicon
In
Gallium
Dysprosium
81
49
31
70
Ga
14
28
Si
Carbon
27
Aluminium
13
12
C
Al
Boron
B
7
14
75
Sb
122
Arsenic
As
Bi
209
Fermium
Fm
Erbium
Er
167
Bismuth
100
68
83
51
Antimony
33
15
Phosphorus
P
31
Nitrogen
N
8
Se
79
Sulphur
S
32
Oxygen
Po
169
Md
Thulium
Tm
101
Mendelevium
69
84
Polonium
52
Tellurium
Te
128
Selenium
34
16
16
O
9
Yb
173
Astatine
At
Iodine
I
127
Bromine
Br
80
Chlorine
No
102
Nobelium
70
Ytterbium
85
53
35
17
Cl
35.5
Fluorine
F
19
Lr
Lutetium
Lu
175
Radon
Rn
Xenon
Xe
131
Krypton
Kr
84
Argon
Ar
40
Neon
103
Lawrencium
71
86
54
36
18
10
Ne
20
Helium
2
0
Hydrogen
VII
4
VI
He
V
1
IV
H
III
The volume of one mole of any gas is 24 dm3 at room temperature and pressure (r.t.p.).
91
Pa
Th
232
Praseodymium
Cerium
59
141
Pr
140
74
Tungsten
42
Molybdenum
24
Chromium
Cr
Ce
Tantalum
41
23
Vanadium
V
1
Group
DATA SHEET
The Periodic Table of the Elements
16

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