Edexcel Jun 2017 (IAL) Paper 6 Q1

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Answer ALL the questions. Write your answers in the spaces provided. 1 Malachite is a green mineral which has been widely used to make jewellery and decorative objects, including vases and fireplaces. Malachite is a basic carbonate with the formula Cu2CO3(OH)2. The use of malachite is limited by its reactivity. It reacts readily with mineral acids and on heating the following decomposition occurs at about 300 C. Cu2CO3(OH)22CuO + H2O + CO2 (a) (i) Give two observations that you would expect to make when a sample of powdered malachite is heated in a boiling tube. (2)(ii) Describe a chemical test that you could use to show that water is formed. Give the positive result of the test. (2)(iii) Describe a chemical test that you could use to show that carbon dioxide is formed. Give the positive result of the test. (2)*P48386A0216*<br /> (b) (i) Give two observations that you would expect to make when dilute sulfuric acid is added to a sample of powdered malachite in a boiling tube. (2)(ii) Write the equation for the reaction of dilute sulfuric acid with malachite. State symbols are not required. (iii) When the reaction of dilute sulfuric acid with malachite was complete, a solution of compound M was added to the reaction mixture until no further change occurred. The final solution was a deep blue colour. Identify compound M. (1) (1)*P48386A0316* Turn over<br /> (c) The apparatus below was used to confirm the formula of a sample of malachite. Solid X absorbs water and solid Y absorbs carbon dioxide. The malachite was heated until the decomposition was complete. malachite heat solid X (i) Suggest a suitable substance to use as solid X. solid Y (1)(ii) Suggest a suitable substance to use as solid Y. (1)(iii) How would you show that the decomposition was complete? (1)(iv) State the measurements that you would make in carrying out this experiment to confirm the formula of malachite. (2)(Total for Question 1 = 15 marks) *P48386A0416*<br />

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