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A Chemical reaction is a process in which one or more substances react and become one or more new substances.

A '''Chemical reaction''' is a process in which one or more molecules change their configuration by exchanging atoms.  It can also involve the collision of individual atoms.  A chemical reaction has two types,  [[endothermic]], requiring a net input of kinetic energy to complete the reaction, and [[exothermic]], resulting in a net output of kinetic energy in the products.