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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.
expression which are used to represent the chemical reactions. synthesis reaction. chemical reaction in which two or more simple substances that combine to form a new more complex substance. decomposition reaction. chemical reaction in which a simplex substance breaks down into two or more simpler substances. single-replacement reaction. chemical reaction in which an uncombined element replaces an element that is part of a compound.