Exothermic reactions:
Reactions in which energy is evolved and rise in temperature takes place are called exothermic reactions.
Example : CaO + 2H2O → Ca(OH)2 + H2 + Heat
Endothermic reaction:
Reactions in which energy is absorbed are known as endothermic reactions.
Example: CaCO3(s) + heat → CaO (s) + CO2(g)
