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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education

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*2925136620*

CHEMISTRY Paper 3 (Extended)

0620/33 May/June 2012 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 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. A copy of the Periodic Table is printed on page 12. 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.

For Examiner’s Use 1 2 3 4 5 6 7 8 Total

This document consists of 11 printed pages and 1 blank page. IB12 06_0620_33/FP © UCLES 2012

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2 1 The table below includes information about some of the elements in Period 2. element symbol structure boiling point / °C carbon C macromolecular 4200 nitrogen N simple molecules N2 –196 fluorine F simple molecules F2 –188 neon Ne single atoms Ne –246 For Examiner’s Use

(a) Why does neon exist as single atoms but fluorine exists as molecules? ........................................................................................................................................... ..................................................................................................................................... [2] (b) What determines the order of the elements in a period? ..................................................................................................................................... [1] (c) When liquid nitrogen boils the following change occurs. N2(l) → N2(g) The boiling point of nitrogen is very low even though the bond between the atoms in a nitrogen molecule is very strong. Suggest an explanation. ........................................................................................................................................... ..................................................................................................................................... [2] (d) Draw a diagram showing the arrangement of the outer shell (valency) electrons in a molecule of nitrogen.

[2] [Total: 7]

© UCLES 2012

0620/33/M/J/12

3 2 Diamond and graphite are different forms of the same element, carbon. Explain the following in terms of their structure. (a) Graphite is a soft material which is used as a lubricant. ........................................................................................................................................... ..................................................................................................................................... [2] (b) Diamond is a very hard material which is used for drilling and cutting. ........................................................................................................................................... ..................................................................................................................................... [2] (c) Graphite is a good conductor of electricity and diamond is a poor conductor. ........................................................................................................................................... ........................................................................................................................................... ..................................................................................................................................... [2] [Total: 6] 3 The uses of a substance are determined by its properties. (a) Plastics are poor conductors of electricity. They are used as insulation for electric cables....
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