A chemical reaction is a process that leads to the transformation of one set of chemical substance to another .Chemical reactions can be either spontaneous requiring no input of energy, or non-spontaneous, typically following the input of some type of energy, such as heat, light or electricity. 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
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