Question

What do you understand by Exothermic and Endothermic reactions? Give examples.

Hint:

Exothermic reactions release energy, while endothermic reactions absorb energy.

Answer 1

(i) Exothermic reactions: These are reactions that release energy in the form of heat or light. The energy required to break bonds is less than the energy released when new bonds are formed. Example: Combustion of wood, where energy is released as heat and light.
(ii) Endothermic reactions: These are reactions that absorb energy from the surroundings. The energy required to break bonds is more than the energy released when new bonds are formed. Example: Photosynthesis, where plants absorb sunlight to convert carbon dioxide and water into glucose.