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Chemistry LibreTexts

Initiation

[ "article:topic", "authorname:ggunawardena" ]
  • Page ID
    40492
  • A typical radical chain reaction consists of three types of steps:

    1.  One initiation step
    An initiation step is a reaction in which radicals are generated from a stable, non-radical precursor.  Initiation increases the concentration of radicals in the system.

    2. Two or more propagation steps
    A propagation step is a reaction in which a radical is consumed and a new radical is generated.  Propagation does not affect the concentration of radicals in the system.

    3.  One or more termination steps
    A termination step is a reaction in which radicals are consumed but no new radicals are generated.  Termination decreases the concentration of radicals in the system.

    eg:  Heat-induced reaction of excess methane with bromine