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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.
Chemical Reactions. A chemical reaction is a process where a set of substances undergo a chemical change to form a different substance. Where do chemical reactions occur? You may think that chemical reactions only happen in science labs, but they are actually happening all the time in the everyday world.