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Item Kinetics of the reaction of the nickel(II) ion with pyridine-2-azo-p-dimethylaniline in t-butanol + water mixtures(Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1974, 70 (12), 1974) Caldin, Edward F.; Godfrey, PeterRate constants and activation parameters have been determined for the reaction of the nickel(II) ion with pyridine -2-azo-p-dimethylaniline, in a series of t-butanol + water mixtures with mole fractions from 0 to 0.4 t-butanol. The rate constant at 25°C varies little with composition, but the enthalpy and entropy of activation both vary considerably, with compensation; they show maxima and minima, which are discussed in relation to theories of solvent structure.Item Reactions of Energetic Hydrogen Atoms with Simple Hydrocarbons Part 1.—The Effect of Moderators(Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1973, 69 (5), 1973) Terry, R.; Baker, K.The reactions of recoil tritium atoms with ethane have been studied in the presence of N2 and CF^ moderators. The results suggest that collisional dissociation of excited HT, initially produced by direct reaction, may be more important in determining the ratio of final products than the commonly described effect of energy shadowing. It is suggested that hydrocarbons behave essentially as carbon atoms as far as their ability to collisionally dissociate HT is concerned, and that moderators which consist of groups which are similar in mass to carbon atoms, exert very little effect on observed product ratios.