Cambridge International Examinations
Cambridge International General Certificate of Secondary Education
*2399434482*
CHEMISTRY
0620/43
May/June 2016
Paper 4 Theory (Extended)
1 hour 15 minutes
Candidates answer on the Question Paper.
No Additional Materials are 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.
You may use an HB pencil for any diagrams or graphs.
Do not use staples, paper clips, glue or correction fluid.
DO NOT WRITE IN ANY BARCODES.
Answer all questions.
Electronic calculators may be used.
A copy of the Periodic Table is printed on page 16.
You may lose marks if you do not show your working or if you do not use appropriate units.
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.
The syllabus is approved for use in England, Wales and Northern Ireland as a Cambridge International Level 1/Level 2 Certificate.
This document consists of 14 printed pages and 2 blank pages.
IB16 06_0620_43/3RP
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1The diagram shows a blast furnace.
waste gases
raw materials:
coke, C
iron ore, Fe2O3
limestone, CaCO3
X
Y
(a)The following equations represent reactions which take place in the blast furnace.
A
C + O2 → CO2
B
CaCO3 → CaO + CO2
C
CaO + SiO2 → CaSiO3
D
CO2 + C → 2CO
E
Fe2O3 + 3CO → 2Fe + 3CO2
D
(i)Which reaction is used to increase the temperature inside the blast furnace? ...........
[1]
(ii)Which reaction is an example of thermal decomposition?
B
...........
[1]
(iii)In which reaction is carbon both oxidised and reduced?
D
...........
[1]
(iv)Which equation shows the removal of an impurity from the iron?
E
...........
[1]
(v)Which equation shows the reaction of an acidic substance with a basic substance?
B
...........
[1]
(b) Use the diagram of the blast furnace to help you answer these questions.
(i)What enters the blast furnace at X?
hot air
. ...................................................................................................................................... [1]
(ii)What leaves the blast furnace at Y?
slag
. ......................................................................................................................................
[1]
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(iii)Name two waste gases that leave the blast furnace.
carbon dioxide
1. . ........................................................................................................................................
Oxygen
2. . ........................................................................................................................................
[2]
(c)The graph shows how the malleability of iron changes as the percentage of carbon in the iron
changes.
high
malleability
low
increasing percentage
of carbon
(i)Describe how the malleability of iron changes as the percentage of carbon changes.
Malleablility decreases as the percentage of carbon decreases
. ............................................................................................................................................
. ...................................................................................................................................... [1]
(ii)Iron obtained from the blast furnace contains high levels of carbon.
Explain how the amount of carbon in the iron can be decreased.
roasting it in air with oxygen
. ............................................................................................................................................
. ............................................................................................................................................
. ...................................................................................................................................... [2]
[Total: 12]
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2The structures of six organic compounds are shown.
A
H
B
H
H
H
H
C
C
C
C
H
H
H
D
H
C
H
H
C
C
H
H
H
H
H
C
C
H
O
H
H
O
H
H
F
H
H
C
C
E
H
O
H
H
C
H
H
C
C
C
H
H
H
H
H
H
H
H
H
C
C
C
C
H
H
H
H
H
(a)Give the name of F.
Butane
.............................................................................................................................................. [1]
(b)Identify two of the compounds that are members of the same homologous series.
Give the general formula of this homologous series.
A and B
compounds .................................................................................................................................
CnH2n
general formula ..........................................................................................................................
[2]
(c)Which two compounds are isomers of each other?
Explain why they are isomers.
E and F
compounds .................................................................................................................................
Same molecular forumla but different structureal formula
explanation .................................................................................................................................
....................................................................................................................................................
[3]
(d)Explain why B is an unsaturated hydrocarbon.
It contains carbon carbon double bond and turns bromine water colorless
....................................................................................................................................................
....................................................................................................................................................
.............................................................................................................................................. [2]
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(e)Describe how D is manufactured from B. Give a chemical equation for the reaction.
By Hyydrtion, addition of water where we have 60 atp, 300 degree celcius and phosphoric acid
....................................................................................................................................................
CH4 + 02 --> C2H5OH
....................................................................................................................................................
Or by feremnatationa nd using a catalust as yest and temperature as 37 degree
C6H12O6--> C2H5OH + 2CO2
..............................................................................................................................................
[3]
(f)Compound A forms an addition polymer.
Draw two repeat units of the addition polymer formed from A.
[2]
[Total: 13]
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3Clean dry air contains mainly nitrogen and oxygen.
(a)Name two other gases that are in clean dry air.
Carbon dioxide and argon
....................................................................................................................................................
.............................................................................................................................................. [2]
(b)Air often contains pollutants.
Identify three common gaseous pollutants in air and state how each of these pollutants are
produced.
pollutant gas 1 ............................................................................................................................
carbon monoxide
lack of oxygen
how it is produced ......................................................................................................................
....................................................................................................................................................
Nitrogen monoxide
pollutant gas 2 ............................................................................................................................
high temoperature in car engines
how it is produced ......................................................................................................................
....................................................................................................................................................
Methane
pollutant gas 3 ............................................................................................................................
Cow dunk or rice fileds
how it is produced ......................................................................................................................
....................................................................................................................................................
[6]
[Total: 8]
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4
(a)Potassium iodide is an ionic compound.
(i)Describe what happens, in terms of electron loss and gain, when a potassium atom reacts
with an iodine atom.
Potassium loses an electron and iodine gains an electron
. ............................................................................................................................................
. ............................................................................................................................................
. ............................................................................................................................................
. ...................................................................................................................................... [2]
(ii)Describe the structure of solid potassium iodide. You may draw a diagram.
. ............................................................................................................................................
Strong electrostatic force of sttraction between the postive and negavive charges
arranged in a regular pattern or lattice arrangment
. ............................................................................................................................................
. ...................................................................................................................................... [2]
(iii)Explain why potassium iodide has a high melting point.
Strong electrostatic forcw of attrangction between positive and negtaive ions so its hard to
. ............................................................................................................................................
break the bonds
. ............................................................................................................................................
. ...................................................................................................................................... [2]
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(b)Potassium iodide and lead nitrate are both soluble. Lead iodide is insoluble.
(i)Describe how a pure dry sample of lead iodide could be made from solid potassium iodide
and solid lead nitrate.
Make aquoes pottasium iodide solution by adding water to it. Make aqueous lead nitrate solution
. ............................................................................................................................................
by adding water to it. Mix the two solutions in a beaker. Stir with a stirrer. Filter out the solution
using a filter paper and filter funnel. Clean the residue with distilled water and dry it between filter
. ............................................................................................................................................
papers.
. ............................................................................................................................................
. ............................................................................................................................................
. ............................................................................................................................................
. ...................................................................................................................................... [4]
(ii)Write an ionic equation for the formation of lead iodide, PbI2, when potassium iodide and
lead nitrate react with each other.
State symbols are not required.
Pb+ + 2I- --> PbI2
. ...................................................................................................................................... [2]
(c)When chlorine gas is bubbled through an aqueous solution of potassium iodide, a redox
reaction takes place.
2I – + Cl 2 → I2 + 2Cl –
(i)State the colour change expected in this reaction.
yellow-green
start colour . .........................................................................................................................
purple
end colour . ..........................................................................................................................
[2]
(ii)Identify the reducing agent in this reaction. Explain your answer.
Chlorine as it loses electrons
. ............................................................................................................................................
. ............................................................................................................................................
. ...................................................................................................................................... [2]
[Total: 16]
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5Dilute hydrochloric acid reacts with sodium carbonate solution.
2HCl (aq) + Na2CO3(aq) → 2NaCl (aq) + H2O(l) + CO2(g)
(a)Explain why effervescence is seen during the reaction.
Neutralliation reaction
Sodium chloride forms
....................................................................................................................................................
.............................................................................................................................................. [1]
(b)Dilute hydrochloric acid was titrated with sodium carbonate solution.
•10.0 cm3 of 0.100 mol / dm3 hydrochloric acid were placed in a conical flask.
•A few drops of methyl orange indicator were added to the dilute hydrochloric acid.
•The mixture was titrated with sodium carbonate solution.
•16.2 cm3 of sodium carbonate solution were required to react completely with the acid.
(i)What colour would the methyl orange indicator be in the hydrochloric acid?
Red
. ......................................................................................................................................
[1]
(ii)Calculate how many moles of hydrochloric acid were used.
0.001
............................ mol [1]
(iii)Use your answer to (b)(ii) and the equation for the reaction to calculate the number of
moles of sodium carbonate that reacted.
0.0005
............................
mol [1]
(iv)Use your answer to (b)(iii) to calculate the concentration of the sodium carbonate solution
in mol / dm3.
0.0000081
............................ mol / dm3 [2]
(c)In another experiment, 0.020 mol of sodium carbonate were reacted with excess hydrochloric
acid.
Calculate the maximum volume (at r.t.p.) of carbon dioxide gas that could be made in this
reaction.
0.08
............................ dm3 [3]
[Total: 9]
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6Concentrated ammonia solution gives off ammonia gas. Concentrated hydrochloric acid gives off
hydrogen chloride gas. Ammonia, NH3, and hydrogen chloride, HCl, are both colourless gases.
Ammonia reacts with hydrogen chloride to make the white solid ammonium chloride.
Apparatus is set up as shown.
cotton wool
soaked in concentrated
hydrochloric acid
cotton wool
soaked in concentrated
ammonia solution
A
B
C
D
glass tube
After ten minutes a white solid forms in the tube where the gases meet.
(a) (i)Write the chemical equation for the reaction of ammonia with hydrogen chloride.
NH3 + HCl--> NH3Cl _ H2
. ...................................................................................................................................... [1]
(ii)Name the process by which the ammonia and hydrogen chloride gases move in the tube.
Diffusion
. ......................................................................................................................................
[1]
(iii)At which point, A, B, C or D, does the white solid form? Explain why the white solid forms
at that point.
A
the solid forms at ..............
Ammonia has fewer number of moles than hcl so it is lighter than hcl so it travels
explanation ..........................................................................................................................
faster and further more
. ............................................................................................................................................
[3]
(iv)The experiment was repeated at a higher temperature.
Predict how the results of the experiment would be different. Explain your answer.
Ammonia will still form at A but at a faster rate as molecules gain kinetic energu and move
. ............................................................................................................................................
faster so there is more collsion mol per second so more effective collsions
. ............................................................................................................................................
. ...................................................................................................................................... [3]
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(b)Some of the white solid is removed from the tube and dissolved in water.
Describe how the white solid could be tested to show it contains,
(i)
ammonium ions,
Damp blue litmus paper
test . .....................................................................................................................................
. ............................................................................................................................................
Turns red
result . ..................................................................................................................................
. ............................................................................................................................................
[3]
(ii)
chloride ions.
Dam blue litmus paper
test . .....................................................................................................................................
. ............................................................................................................................................
Bleaches
result . ..................................................................................................................................
. ............................................................................................................................................
[3]
(c)The diagram shows the electron arrangement in a molecule of ammonia, showing only outer
shell electrons.
H
N
H
H
(i)State the type of bonding in ammonia.
Covalent bonding
. ......................................................................................................................................
[1]
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(ii)Hydrazine, N2H4, is another compound of nitrogen and hydrogen.
Complete the diagram to show the electron arrangement in a molecule of hydrazine,
showing only outer shell electrons.
H
H
N
N
H
H
[3]
(d)Nylon and proteins are both polymers containing nitrogen.
(i)Name the linkages found in the polymers of nylon and protein.
Amide linklage
. ...................................................................................................................................... [1]
(ii)Describe one difference in the structures of nylon and protein.
Nylon is synthetic poulmer while protein is natural pulymer
. ......................................................................................................................................
[1]
(iii)What is the general name given to the products of hydrolysis of proteins?
Amino acid
. ...................................................................................................................................... [1]
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(e)Suggest the structure of the monomer used to make the polymer shown.
H
O
N
C
n
[1]
[Total: 22]
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15
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12
V
Cr
Mn
Co
27
Ni
28
Cu
29
Zn
30
Fe
57–71
56
55
0620/43/M/J/16
104
88
–
59
90
89
232
thorium
actinium
–
Th
Ac
140
cerium
139
lanthanum
231
protactinium
Pa
91
141
praseodymium
Pr
58
Ce
–
–
Db
dubnium
Rf
rutherfordium
La
57
actinoids
105
181
tantalum
Ta
73
93
niobium
Nb
41
51
vanadium
238
uranium
U
92
144
neodymium
60
Nd
–
Sg
seaborgium
106
184
tungsten
W
74
96
molybdenum
Mo
42
52
chromium
–
neptunium
Np
93
–
promethium
61
Pm
–
Bh
bohrium
107
186
rhenium
Re
75
–
technetium
Tc
43
55
manganese
–
plutonium
Pu
94
150
samarium
62
Sm
–
Hs
hassium
108
190
osmium
Os
76
101
ruthenium
Ru
44
56
iron
–
americium
Am
95
152
europium
63
Eu
–
Mt
meitnerium
109
192
iridium
Ir
77
103
rhodium
Rh
45
59
cobalt
–
curium
Cm
96
157
gadolinium
64
Gd
–
Ds
darmstadtium
110
195
platinum
Pt
78
106
palladium
Pd
46
59
nickel
The volume of one mole of any gas is 24 dm3 at room temperature and pressure (r.t.p.)
actinoids
lanthanoids
–
Ra
radium
Fr
francium
89–103
178
87
137
hafnium
133
barium
Hf
caesium
lanthanoids
Ba
72
91
zirconium
Zr
40
48
titanium
Cs
89
yttrium
88
strontium
85
rubidium
Y
39
45
Sr
38
40
Ca
Rb
37
39
K
scandium
–
berkelium
Bk
97
159
terbium
65
Tb
–
Rg
roentgenium
111
gold
197
Au
79
108
silver
Ag
47
64
copper
–
californium
Cf
98
163
dysprosium
66
Dy
–
Cn
copernicium
112
201
mercury
Hg
80
112
cadmium
Cd
48
65
zinc
calcium
Ti
26
potassium
Sc
25
31
24
–
einsteinium
Es
99
165
holmium
67
Ho
204
thallium
Tl
81
115
indium
In
49
70
gallium
Ga
27
20
24
19
Al
–
fermium
Fm
100
167
erbium
68
Er
–
Fl
flerovium
114
lead
207
Pb
82
tin
119
Sn
50
73
germanium
Ge
32
28
silicon
Si
14
12
13
11
aluminium
23
C
carbon
boron
magnesium
23
1
sodium
22
B
N
7
O
8
F
9
VII
2
VIII
–
mendelevium
Md
101
169
thulium
69
Tm
209
bismuth
Bi
83
122
antimony
Sb
51
75
arsenic
As
33
31
phosphorus
P
15
14
nitrogen
–
nobelium
No
102
173
ytterbium
70
Yb
–
Lv
livermorium
116
–
polonium
Po
84
128
tellurium
Te
52
79
selenium
Se
34
32
sulfur
S
16
16
oxygen
–
Lr
lawrencium
103
175
lutetium
71
Lu
–
astatine
At
85
127
iodine
I
53
80
bromine
Br
35
35.5
chlorine
Cl
17
19
fluorine
–
radon
86
Rn
131
xenon
54
Xe
84
krypton
36
Kr
40
argon
18
Ar
20
neon
Ne
10
4
helium
6
VI
hydrogen
5
V
He
Mg
21
relative atomic mass
name
atomic symbol
atomic number
Key
IV
H
1
III
Na
9
11
7
Be
beryllium
Li
4
3
lithium
II
I
Group
The Periodic Table of Elements
16