Chemical Equilibrium:
When a reversible reaction is carried out in a closed vessel, a stage is reached when the forward reaction and backward reaction proceed with the same speed, this stage is known as Chemical Equilibrium.
Exothermic Reaction:
The reaction in which heat is evolved is called exothermic reaction.
N2 + 3H2 ⇌ 2NH3 + 23 Kcal (Exothermic)
Endothermic Reaction:
The reaction in which heat is absorbed is called endothermic reaction.
N2 + O2 ⇌ 2NO – 43.2 Kcal (Endothermic)