OCR A Specimen Paper 1 Q17

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17 Iodine monochloride, ICl, can react with hydrogen to form iodine. 14 2ICl + H22HCl + I2 This reaction was carried out several times using different concentrations of ICl or H2. The initial rate of each experiment was calculated and the results are shown below. Initial concentrations are shown for each experiment. [ICl] / mol dm3 [H2] / mol dm3 Rate / mol dm3 s1 Experiment 1 Experiment 2 Experiment 3 0.250 0.500 0.125 0.500 0.500 0.250 2.04102 4.08102 5.10103 (i) Calculate the rate constant, k, for this reaction. Include units in your answer. (a) Show all your working. Specimen (ii) Calculate the rate of reaction when ICl has a concentration of 3.00103 mol dm3 and H2 k =unitshas a concentration of 2.00103 mol dm3. Show all your working. rate =mol dm3 s1OCR 2014 H432/01 [4] [1]<br /> 15 (b) Reaction rates can be increased or decreased by changing the temperature of the reaction. Fig. 17.1 below shows the energy distribution of the reactant molecules at 25 C. number of molecules Draw a second curve on Fig. 17.1, to represent the distribution of the same number of molecules at a higher temperature. Use your curve to explain how increasing the temperature increases the rate of reaction.. energy Fig. 17.1 Specimen [2]OCR 2014 H432/01 Turn over<br />

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