Question

Name a reaction in which a substance breaks up into two or more simpler substances.

Answer 1

A chemical reaction in which one reactant breaks into two or more products is called a decomposition reaction.

Example: $\underset{\mathrm{Carbonate}}{\underset{\mathrm{Calcium}}{{\mathrm{CaCO}}_3\left(\mathrm{s}\right)}}\to \underset{\mathrm{Oxide}}{\underset{\mathrm{Calcium}}{\mathrm{CaO}\left(\mathrm{s}\right)}}+\underset{\mathrm{Dioxide}}{\underset{\mathrm{Carbon}}{{\mathrm{CO}}_2\left(\mathrm{g}\right)}}$