Question

Define chemical reaction.

Answer 1

A chemical reaction is a reaction in which two or more substances undergo a chemical change to form new substances.

The substances that combine together to form new substances are called reactants and the new substances formed are called products.

General form : $$\begin{gathered} \mathrm{A}+\mathrm{B}\to \mathrm{C}+\mathrm{D} \\ \left(\mathrm{reactants}\right)\left(\mathrm{products}\right) \end{gathered}$$