Abstract
This chapter provides an overview of chain reactions. In chain reactions, free radicals bring about chemical processes, such as abstraction when they react with a molecule, producing new atoms and radicals, which can then bring about further reactions. The chapter presents a sequence of steps for chain reactions involving halogens and molecular hydrogen—initiation step, which produces the chain carriers; propagation steps in which chain carriers recycle and thus catalyze the conversion of reactants to products; termination steps, which remove the intermediates. The rates of the propagation steps are much greater than those of the initiation or the termination processes, which have negligible contributions to the overall rate. In the propagation steps, atoms are formed and consumed. Expressions for concentrations are most frequently obtained through the steady-state hypothesis.
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