Chemistry Paper

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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Level

*0281936391*

CHEMISTRY Paper 5 Planning, Analysis and Evaluation 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 or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions. You may lose marks if you do not show your working or if you do not use appropriate units. Use of a Data Booklet is unnecessary. 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.

9701/53
May/June 2010 1 hour 15 minutes

For Examiner’s Use 1 2 Total

This document consists of 9 printed pages and 3 blank pages. DC (SM/SW) 27888 © UCLES 2010

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2 1 At any temperature, equilibrium can be established between a liquid X and the vapour given off by that liquid. X (l) X (g) For Examiner’s Use

As the temperature of the system is raised, so the pressure exerted by the vapour increases. When the vapour pressure becomes equal to the surrounding (ambient) air pressure, the liquid boils. When the liquid contains a dissolved solid (solute), the vapour pressure above the liquid is reduced.

You are to plan an experiment to investigate how the boiling point of an aqueous solution of potassium chloride depends on the concentration of the solution.

(a) (i)

By considering how the vapour pressure changes as the concentration of the aqueous potassium chloride increases, predict and explain how the boiling point of the solution will be affected by the concentration of the solution. Predict how the boiling point will change .................................................................. .................................................................................................................................. .................................................................................................................................. Explanation .............................................................................................................. .................................................................................................................................. ..................................................................................................................................

(ii)

Display your prediction in the form of a sketch graph, labelling clearly the point representing the boiling point of pure water and its value.

boiling point

0 concentration of the potassium chloride [3]

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9701/53/M/J/10

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3 (b) In the experiment you are about to plan, identify the following. (i) (ii) the independent variable .......................................................................................... the dependent variable ............................................................................................. [2] For Examiner’s Use

(c) Draw a diagram of the apparatus you would use in the experiment. Your apparatus should use only standard items found in a school or college laboratory and should show clearly (i) (ii) how the solution will be heated and over-heating of the solution prevented, how the thermometer will be positioned. Remember you are investigating an equilibrium.

Label each piece of apparatus used, indicating its size or capacity and the temperature range that the thermometer should cover.

[3]

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4 (d) When investigating how the boiling point of a solution changes with concentration, it is convenient to represent...
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