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Updated February 09, 2017. A chemical reaction is a process that is usually characterized by a chemical change in which the starting materials (reactants) are different from the products. Chemical reactions tend to involve the motion of electrons, leading to the formation and breaking of chemical bonds.
â¢ CHEMICAL REACTION (noun). The noun CHEMICAL REACTION has 1 sense: 1. (chemistry) a process in which one or more substances are changed into others. Familiarity information: CHEMICAL REACTION used as a noun is very rare.hemical decomposition reaction; decomposition; decomposition reaction ((chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance). chemical equilibrium; equilibrium (a chemical reaction and its reverse proceed at equal rates).