This translation, in two volumes, of an introductory paper to a Symposium on Chemical Kinetics and Reactivity, held in Moscow in 1954, has been enlarged and revised by the author, winner of the Nobel Prize in chemistry in 1956 and one of the two or three top flight Russian physical scientists. Volume 1 covers a wide range of important work and includes a survey of radical and chain reactions and a discussion of chemical changes, direct mono- and bi-molecular processes, ionic reactions, heterogeneous catalysis, initiation and destruction of radical chains on solid surfaces.

Originally published in 1958.

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