A chemical reaction is a process that always results in the interconversion of chemical substances. The substance or
substances initially involved in a chemical reaction are called reactants. Chemical reactions are usually characterized by a
chemical change, and they yield one or more products, which usually have properties different from the reactants.
Classically, chemical reactions encompass changes that strictly involve the motion of electrons in the forming and breaking
of chemical bonds, although the general concept of a chemical reaction, in particular the notion of a chemical equation, is
applicable to transformations of elementary particles, as well as nuclear reactions.

Different chemical reactions are used in combinations in chemical synthesis in order to get a desired product. In
biochemistry, series of chemical reactions catalyzed by enzymes form metabolic pathways, by which syntheses and
decompositions ordinarily impossible in conditions within a cell are performed.

Source: WikepediA
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