What do you understand by exothermic reaction and endothermic reaction? Give one example of each type.
What do you understand by exothermic reaction and endothermic reaction? Give one example of each type.

Exothermic reaction:  An exothermic reaction is a reaction in which heat is released during the reaction.

For instance,

Cao + CO2→ CaCO3 ΔH=-178kJmol-1

Endothermic reaction: An endothermic reaction is a reaction in which heat is absorbed.

For instance,

2NH3 → 3N2+ H2 ΔH=918kJmol-1