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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.
Share. Reaction Definition: A reaction or chemical reaction is a chemical change which forms new substances. Reaction Examples: The chemical reaction H 2 (g) + Â½ O 2 (g) â H 2 O(l) describes the formation of water from its elements.Also Known As: Chemical Reaction, Chemical Change. By Anne Marie Helmenstine, Ph.D.eaction Definition: A reaction or chemical reaction is a chemical change which forms new substances.