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SPA (DR/DR) T56861/3
© UCLES 2008
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS
General Certificate of Education Ordinary Level
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 soft 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.
Write your answers in the spaces provided in the Question Paper.
The number of marks is given in brackets [ ] at the end of each question or part question.
At the end of the examination, fasten all your work securely together.
CHEMISTRY
5070/04
Paper 4 Alternative to Practical
October/November 2008
1 hour
Candidates answer on the Question Paper.
No Additional Materials are required.
For Examiner’s Use
2
5070/04/O/N/08
For
Examiner’s
Use
© UCLES 2008
1 A student found the composition of air using the apparatus shown below.
20 40 60 80 100
20
40
60
80
100
copper
A
B
heat
Syringe A contained 80 cm3 of air. The air was forced over heated copper into syringe B. The
air was then forced back into syringe A.
The process was repeated several times until the volume of gas forced back into syringe A
was constant.
The diagram below shows the volume of gas in syringe A after the experiment was finished.
20
40
60
80
100
A
(a) (i) Name the major component of the gas remaining in syringe A.
.......................................[1]
(ii) What is the volume of gas remaining in syringe A?
.......................................[1]
(iii) Calculate the percentage of oxygen in the original sample of air.
.......................................[1]
(b) The copper reacted with oxygen in the air to produce copper(II) oxide.
(i) Write the equation for this reaction.
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