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- chain reaction
- A reaction mechanismThe set of elementary steps by which a reaction is thought to occur; each individual step corresponds to either a bimolecular collision or unimolecular reaction of a single molecule. that contains a sequence of steps in which a productA substance produced by a chemical reaction. of one step reacts in a second step and a product of the second step is a reactantA substance consumed by a chemical reaction. in the first step; such steps can repeat many times before the chain is broken. Chain reactions often involve free radicals.