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By H.E. Avery

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01 moldm-3 give a value of 150 s for the reaction half-life. Calculate the corresponding rate constant at 0°C. 8. Two substances A and B undergo a bimolecular reaction step. 5 mol dm - 3 . Calculate the second-order rate constant for the reaction. Sc. (1st year) 1967) 9. 0762 mol dm- 3. 5 60 Calculate the rate constant for the reaction. 10. The following results were obtained for the decomposition of ammonia on a heated tungsten surface Initial pressure/torr Half-life/s 65 290 I 05 460 Determine the order of the reaction.

3. 3 First-order plot for the hydrolysis of methyl acetate in excess dilute HCl at 25°C (ii} Gas chromatography In the last twenty years, the development of gas chromatographic techniques has facilitated the study of the kinetics of many gas-phase reactions. This analytical technique is extremely sensitive and can be used to analyse a large number of chemical compounds simultaneously. With gas-solid chromatography or gas-liquid chromatography it is possible to analyse the products of a very complex reaction and identify the minor as well as the major reaction products.

Experiments in Physical Chemistry (2nd Edition), Pergamon, Oxford (1968). 1 Arrhenius equation The rate equation of the form rate =kr(Ar•rsrz ... 1) expresses the dependence of reaction rate on the concentrations of the reactants. However, the rate of a reaction varies greatly with temperature, since for a typical process the rate doubles or trebles for a rise in temperature of l0°C. 1 the concentration terms and the order are not sensitive to changes in temperature, and it is the rate constant kr which is the temperature-dependent term.

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