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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.
A chemical reaction is when a substance (or a few substances) change into another substance. Chemical reactions are chemical transformations. If you take a chemistry class, you'll definitely learn about chemical reactions: when one or more substances change into something else. When making beer, yeast turns the sugar into alcohol: that's a chemical reaction. When something iron rusts because of exposure to air, that's a chemical reaction.