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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.
Combustion Reaction Defined. Chemical reactions are very common. A chemical reaction is any process by which the atoms of one or more substances are rearranged to form different substances.There are numerous types of chemical reactions.ombustion reactions are very common because oxygen readily reacts with many substances. One combustion reaction that has been very important throughout history is the burning of coal.