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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.
Reaction, Chemical. the transformation of one or more substances into one or more new substances, differing from the original in chemical composition or structure. Both the total number of atoms of any given element and the chemical elements making up the substances remain unchanged during a chemical reaction.