AQA Jan 2013 Paper 4 Q1

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section a answer all questions in the spaces provided do not write outside the box a the data in the following table were obtained in two experiments about the rate of the reaction between substances b and c at a constant temperature experiment initial concentration of b mol dm initial concentration of c mol dm initial rate mol dm s to be calculated the rate equation for this reaction is known to be rate k b c a i use the data from experiment to calculate a value for the rate constant k at this temperature and deduce its units calculation units marks extra space a ii calculate a value for the initial rate in experiment mark wmp jan chem do not write outside the box b the data in the following table were obtained in a series of experiments about the rate of the reaction between substances d and e at a constant temperature experiment initial concentration of d mol dm initial concentration of e mol dm initial rate mol dm s b i deduce the order of reaction with respect to d mark b ii deduce the order of reaction with respect to e mark question continues on the next page turn over wmp jan chem c the compound ch cbr reacts with aqueous sodium hydroxide as shown in the fol following equation do not write outside the box ch cbr oh ch coh br this reaction was found to be first order with respect to ch cbr but zero order with respect to hydroxide ions the following two step process was suggested step ch cbr ch c br step ch c oh ch coh c i deduce the rate determining step in this two step process mark c ii outline a mechanism for this step using a curly arrow mark wmp jan chem

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