This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Chemical Equations are used to show the chemical reaction between two substances. 
For example, 
The reaction of sodium and chlorine to form sodium chloride, 2Na+ Cl_{2} = 2NaCl

The burning of coal (carbon) to give carbon dioxide, C +  O_{2} = C O_{2}

The decomposition of water into hydrogen and oxygen gases, 2 H_{2} O = 2 H_{2}  O_{2}

Hope it helps...! ^_^