AQA Jun 2011 Paper 2 Q5

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do not write outside the box a sample of nitrogen dioxide gas no was prepared by the reaction of copper with concentrated nitric acid a i balance the equation for the reaction of copper with concentrated nitric acid cu hno cu no no h o a ii give the oxidation state of nitrogen in each of the following compounds hno no mark marks a iii deduce the half equation for the conversion of hno into no in this reaction mark b the following equilibrium is established between colourless dinitrogen tetraoxide gas n o and dark brown nitrogen dioxide gas n o g no g h kj mol b i give two features of a reaction at equilibrium feature feature marks wmp jun chem b ii use le chatelier s principle to explain why the mixture of gases becomes darker in colour when the mixture is heated at constant pressure do not write outside the box marks b iii use le chatelier s principle to explain why the amount of no decreases when the pressure is increased at constant temperature marks turn over for the next question turn over wmp jun chem

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