Igcse Combined Science Past Paper Paper 2 0653/21 October/November 2010

2772 Words Nov 8th, 2012 12 Pages
UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education



October/November 2010 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 a soft pencil for any diagrams, graphs, tables 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 20. At the end of the examination, fasten all your work securely
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cliff falling rock


Fig. 3.1 (a) (i) As the rock falls, it gains kinetic energy. Name the form of energy the rock had at the top of the cliff. [1] (ii) Suggest what happens to the kinetic energy of the rock when the rock hits the water.


(b) Fig. 3.2 shows a speed-time graph for the motion of the rock.
25 20 speed m/s 15 10 5 0 0 1 2 3 4 time / s 5 6 7

Fig. 3.2

(i) After how many seconds was the speed of the rock 15 m / s? s [1]

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7 (ii) The rock is accelerating. Explain the meaning of the term accelerating.
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(c) The rock contains radioactive substances emitting high levels of ionising radiation. (i) State how the radioactivity could be detected. [1] (ii) Explain why it would be dangerous for a person to handle this rock without proper protection.


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[Turn over

8 4 Copper metal reacts with oxygen gas to form the black solid, copper oxide. (a) (i) Use this example to describe one difference between elements and compounds.
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[2] (ii) State why this reaction is an example of oxidation.

[1] (iii) Name the type of chemical bonding found in copper oxide. [1]

(b) Fig. 4.1 shows apparatus used in the electrolysis of copper chloride solution.
– power supply +

Fig. 4.1 (i) On the diagram, clearly label the anode and the electrolyte. (ii) Copper chloride solution contains copper ions and chloride ions

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