AQA Jun 2015 Paper 4 Q1

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section a answer all questions in the spaces provided do not write outside the box gases a and b react as shown in the following equation a g b g c g d g the initial rate of the reaction was measured in a series of experiments at a constant temperature the following rate equation was determined rate k a an incomplete table of data for the reaction between a and b is shown in table table experiment initial a mol dm initial b mol dm initial rate mol dm s a use the data from experiment to calculate a value for the rate constant k at this temperature deduce the units of k marks calculation units wmp jun chem do not write outside the box b use your value of k from question a to complete table for the reaction between a and b if you have been unable to calculate an answer for question a you may assume a value of this is not the correct answer c the reaction is zero order with respect to b state the significance of this zero order for the mechanism of the reaction marks mark turn over for the next question turn over wmp jun chem

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