Chemistry Igcse Paper

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7081/01

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London Examinations GCE
Chemistry Ordinary Level
Paper 1
Wednesday 12 January 2011 – Afternoon Time: 1 hour 15 minutes Materials required for examination Nil Items included with question papers Nil

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Question Leave Number Blank

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Instructions to Candidates
In the boxes above, write your centre number, candidate number, your surname, initial(s) and signature. Answer ALL the questions. Write your answers in the spaces provided in this question paper.

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Information for Candidates
A Periodic Table is printed on the back cover of this question paper. Calculators may be used. The total mark for this paper is 100. The marks for individual questions and the parts of questions are shown in round brackets: e.g. (2). There are 13 questions in this question paper. Any blank pages are indicated. DATA One mole of any gas occupies 24 000 cm3 at room temperature and atmospheric pressure. One mole of electrons carries a charge of 96 500 coulombs or 1 faraday.

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Advice to Candidates
Write your answers neatly and in good English. In calculations, show all the steps in your working.

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This publication may be reproduced only in accordance with Edexcel Limited copyright policy. ©2011 Edexcel Limited. Printer’s Log. No.

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N36637A
W850/U7081/57570 5/5/5/

*N36637A0120*

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Answer ALL the questions. 1. Complete the table. Name of compound calcium bromide NH4NO3 sodium sulphite copper(I) oxide PbO2 iron(III) sulphate Q1 (Total 6 marks) Formula of compound

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2.

Complete the following statements by inserting the missing colours. (a) When water is added to anhydrous cobalt chloride, it turns ............................................... . (1) (b) When iodine is heated, it forms a ............................................... vapour. (1) (c) The element whose atomic number is 16 is a ............................................... solid at room temperature. (1) (d) Ammonia and hydrogen chloride react to form a ............................................... solid. (1) (e) When nitrogen monoxide is mixed with air, a ............................................... gas is formed. (1) (f) When calcium is burned in oxygen, the product is a ............................................... solid. (1) (Total 6 marks) Q2

*N36637A0320*

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3.

Identify, by name or formula, an element or compound that fits each of the descriptions. (a) A gas molecule containing three atoms that is present in dry air. ....................................................................................................................................... (1) (b) A white solid that is formed when magnesium carbonate is heated. ....................................................................................................................................... (1) (c) The precipitate formed when aqueous potassium carbonate is added to aqueous calcium nitrate. ....................................................................................................................................... (1) (d) A diatomic gas molecule that consists of two different atoms covalently bonded together. ....................................................................................................................................... (1) (e) A metal that will burn with a brick red flame. ....................................................................................................................................... (1) (f) A colourless solution with a pH of 14. ....................................................................................................................................... (1) (g) The gas evolved when potassium nitrate is heated....
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