Question

Define the following term and answer the associated question :

Exothermic reaction: State the effect of an exothermic reaction on the surroundings. Also give an example of such a reaction.

Answer 1

Exothermic reaction- The type of reaction in which heat energy is released to get products from the reaction of reactants is known as an exothermic reaction.

• During these reactions bond is broken and energy is released into the surroundings causing a rise in the temperature of the surroundings.

Let us understand it with an example.

When we dissolve Calcium oxide (CaO) in the water we get Calcium hydroxide and a lot of heat energy is released to the surroundings.

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