Question

Write a short note on exothermic reaction.

Answer 1

• Exothermic reaction - A chemical reaction in which heat energy is released along with the formation of a product is called an exothermic reaction.
• Example - When water is added to quick lime, heat energy is evolved.

$\underset{\mathrm{Calcium}\mathrm{oxide}}{\mathrm{CaO}\left(\mathrm{s}\right)}+\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}\to \underset{\mathrm{Calcium}\mathrm{hydroxide}}{\mathrm{Ca}{\left(\mathrm{OH}\right)}_2\left(\mathrm{aq}\right)}+\mathrm{Heat}$