Question

What is called thermolysis reactions?

Answer 1

A chemical reaction is a process in which an old bond breaks up and a new chemical bond gets formed. Thermolysis chemical reactions are a special type of chemical reaction in which the reactant gets decomposed by heat. For example,

$$\mathrm{CaCO}{\phantom{A}}_3{\phantom{A}}_{(\mathrm{s})}\stackrel{\mathrm{Heat}}{\rightleftharpoons }\mathrm{CaO}{\phantom{A}}_{(\mathrm{s})}+\mathrm{CO}{\phantom{A}}_2{\phantom{A}}_{(\mathrm{g})}$$

$$2\mathrm{HgO}{\phantom{A}}_{(\mathrm{s})}\stackrel{\mathrm{Heat}}{\to }2\mathrm{Hg}{\phantom{A}}_{(\mathrm{l})}+\mathrm{O}{\phantom{A}}_2{\phantom{A}}_{(\mathrm{g})}$$

In these reactions, heat is supplied to break the bonds, so generally, they are endothermic in nature.