Exam Paper

2986 Words Mar 30th, 2013 12 Pages
UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Subsidiary Level and Advanced Level

CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended) Data Booklet

May/June 2012 1 hour


READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, Centre number and candidate number on the Answer Sheet in the spaces provided unless this has been done for you. There are forty questions on this paper. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the one you
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A B C D It is oxidised from +3 to +4. It is reduced from +3 to +2. It is reduced from +6 to +4. There is no change in the oxidation number.

11 The diagram shows a cell for the manufacture of aluminium. graphite anodes

mixture of Al 2O3 and molten cryolite graphite lining acting as cathode molten aluminium

Which statement is incorrect? A B C D Aluminium ions are oxidised in this process. Aluminium is liberated at the cathode by the reaction Al 3+ + 3e– → Al . The cryolite acts as a solvent. The graphite anode burns away.

© UCLES 2012


5 12 Aluminium chloride catalyses certain reactions by forming carbocations with chloroalkanes as shown. RCl + Al Cl 3 → R+ + Al Cl 4– Which property makes this reaction possible? A B C D Al Cl 3 exists as the dimer Al 2Cl 6 in the vapour. Al Cl 3 is a covalent molecule. The aluminium atom in Al Cl 3 has an incomplete octet of electrons. The chlorine atom in RCl has a vacant p orbital.

13 Use of the Data Booklet is relevant to this question. When a mineral was heated in a Bunsen flame to constant mass, a colourless gas that turned lime water milky was evolved. The remaining solid was cooled and then added to aqueous hydrochloric acid. Vigorous effervescence was seen. What was the mineral? A B C D aragonite, CaCO3 artinite, MgCO3.Mg(OH)2.3H2O barytocalcite, BaCO3.CaCO3 dolomite, CaCO3.MgCO3

14 Use of the Data Booklet is relevant to this question. The

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