Question

what are chemical equatios?give 3 examples

Answer 1

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...! ^_^