ENERGY CHANGES DURING CHEMICAL CHANGES (REACTIONS)
Channel: Ramancoeducation
Date: 01/12/2022

The chemical changes or reactions are accompanied by energy changes which may be in the form of heat, light, electricity, sound, work, etc.
On the basis of energy change the chemical reactions are of the following types :

1. Exothermic reaction : A chemical reaction which proceeds with evolution of heat energy is called an exothermic reaction. Heat is evolved when new bonds are formed.

2. Endothermic reaction : A chemical reaction which proceeds with the absorption of the heat energy is called an endothermic reaction. Heat absorbed is used for breaking of old bonds.
3. Photochemical reaction : A reaction which proceeds with the absorption of light energy is called a photochemical reaction.

4. Electrochemical reaction : The chemical reaction which proceed with the absorption of electrical energy is called electrochemical reaction.