AQA Jun 2010 Paper 2 Q1

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section a do not write outside the box answer all the questions in the spaces provided an equation for the equilibrium reaction between hydrogen iodine and hydrogen iodide is shown below a the curve in the diagram below illustrates the reaction profile for this equilibrium reaction without a catalyst h g i g hi g enthalpy h g i g hi g a i draw on the diagram a curve to illustrate the reaction profile for this equilibrium reaction marks with a catalyst a ii use the diagram to deduce whether the formation of hydrogen iodide from hydrogen and iodine is exothermic or endothermic mark a iii state what the diagram suggests about the sum of the bond enthalpies for the reactant molecules compared with the product molecules mark wmp jun chem do not write outside the box a iv in terms of p and q identify the following for this equilibrium without a catalyst a value for the activation energy for the forward reaction a value for the overall enthalpy change for the forward reaction marks b a mixture of h g and i g was allowed to reach equilibrium b i state the effect of a catalyst on the rate of attainment of this equilibrium mark b ii state and explain the effect of an increase in total pressure on the rate of attainment of this equilibrium effect of an increase in pressure on rate explanation marks turn over for the next question turn over wmp jun chem

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