Edexcel Jan 2010 Paper 3 Q1

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PMT Answer ALL the questions. Write your answers in the spaces provided. 1 Compound A is a white solid that contains one cation and one anion. (a) A flame test is carried out on compound A by mixing the solid with concentrated hydrochloric acid and using a piece of wire to place some of the solution formed in a Bunsen flame. The flame is coloured yellow. (i) Name a material from which the wire is made. Suggest ONE reason why this material is used. (2) NameReason(ii) Identify, by name or formula, the cation present in compound A. (1)(b) When aqueous silver nitrate solution is added to a solution of compound A, a cream precipitate forms. The cream precipitate dissolves in concentrated aqueous ammonia solution. (i) Name the cream precipitate formed when aqueous silver nitrate is added to the solution of compound A. (1)(ii) Give the formula of the anion in compound A. (1)(iii) Describe what you would see if the cream precipitate in (b)(i) was left in sunlight. (1)*N34104A0216*<br /> PMT (c) Concentrated sulfuric acid is added to compound A in a test tube. Steamy fumes are seen at the mouth of the test tube. After a few minutes, the contents of the test tube turn brown. A gas is given off which is tested with a piece of filter paper soaked in a solution of aqueous acidified potassium dichromate(VI). The paper turns green. (i) Identify, by name or formula, the steamy fumes formed initially. (1)(ii) Describe a further test you could carry out to confirm the identity of the steamy fumes. Give the result of your test. (2) TestResult(iii) Identify, by name or formula, the substance responsible for the brown colour in the test tube. (1)(iv) Name the gas which turned the filter paper green. Suggest the type of reaction by which this gas was formed from sulfuric acid. (2) GasType of reaction(Total for Question 1 = 12 marks) *N34104A0316* Turn over<br />

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