Explain the following terms with examples.

Endothermic reaction

Endothermic reaction: In endothermic reaction, heat is either absorbed from the surroundings or heat has to supplied from outside. It means an endothermic reaction needs or takes in heat to continue.

For example: When a solid ammonium chloride (NH₄Cl) is dissolved into water, you will observe that the tube becomes colder.

NH₄Cl (s) + H₂O → NH₄Cl (aq) – Heat

In the above reaction, heat is absorbed from surroundings.