Paper 3 October/November 2004 - GCE Guide
UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education
CHEMISTRY Paper 3
*062003*
0620/03
Candidates answer on the Question Paper. No Additional Materials required.
Candidate Name
October/November 2004 1 hour 15 minutes
Centre Number
Candidate Number
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 a pencil for any diagrams, graphs or rough working. WRITE IN THE BOXES PROVIDED ON THE QUESTION PAPER DO NOT WRITE IN THE BARCODE. DO NOT WRITE IN THE GREY AREAS BETWEEN THE PAGES.
For Examiner's Use 1 2
Do not use staples, paper clips, highlighters, glue or correction fluid.
3
You may use a calculator.
4
5 Answer all questions.
The number of marks is given in brackets [ ] at the end of each question
6
or part questions.
7
A copy of the Periodic Table is printed on page 16.
8
Total
This document consists of 15 printed pages and 1 blank page.
IB04 11_0620_03REP/RP ? UCLES 2004
[Turn over
2
1 (a) Two of the gases in air are nitrogen and oxygen. Name two other gases present in
For
unpolluted air.
Examiner's Use
[2]
(b) Two common pollutants present in air are sulphur dioxide and lead compounds. State the source and harmful effect of each. sulphur dioxide
source
harmful effect
[3]
lead compounds
source
harmful effect
[2]
(c) Respiration and photosynthesis are two of the processes that determine the percentage of oxygen and of carbon dioxide in the air.
(i) Name another process that changes the percentages of these two gases in air.
[1]
(ii) The equation for photosynthesis is given below.
6CO2 + 6H2O
C6H12O6 + 6O2
This is an endothermic reaction.
Complete the reaction for respiration.
C6H12O6 + 6O2
+
This is an
reaction. [2]
. ? UCLES 2004
0620/03/O/N/04
3
(d) The rate of photosynthesis of pond weed can be measured using the following
For
experiment.
Examiner's Use
graduated tube
gas collects bubbles
pond weed
water containing dissolved carbon dioxide (i) Describe how you could show that the gas collected in this experiment is oxygen.
[1] (ii) What measurements are needed to calculate the rate of this reaction?
[2] (iii) What would be the effect, and why, of moving the apparatus further away from the
light?
[2]
? UCLES 2004
0620/03/O/N/04
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4
2 The salt copper(II) sulphate can be prepared by reacting copper(II) oxide with sulphuric acid.
For Examiner's
Use
Complete the list of instructions for making copper(II) sulphate using six of the words below.
blue
cool
dilute
filter
saturated
sulphate
white
oxide
Instructions
1 Add excess copper(II) oxide to beaker and boil it.
sulphuric acid in a
2
to remove the unreacted copper(II) oxide.
3 Heat the solution until it is
.
4
the solution to form
coloured crystals of copper (II)
.
[6]
. ? UCLES 2004
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5
3 The simplest alcohol is methanol. (a) It is manufactured by the following reversible reaction. CO (g) + 2H2 (g) CH3OH (g) 300 oC 30atm (i) Reversible reactions can come to equilibrium. Explain the term equilibrium.
For Examiner's
Use
[1] (ii) At 400 oC, the percentage of methanol in the equilibrium mixture is lower than at
300 oC. Suggest an explanation.
[2]
(iii) Suggest two advantages of using high pressure for this reaction. Give a reason for each advantage.
advantage reason
advantage reason
[5]
? UCLES 2004
0620/03/O/N/04
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