Question

Define a chemical reaction.

Answer 1

• The change of one or more substances into other substances having different compositions and different properties is called a chemical reaction.
• For example - When Carbon is burnt in the presence of oxygen, it forms Carbon dioxide.

$\underset{\mathrm{Carbon}}{\mathrm{C}\left(\mathrm{s}\right)}+\underset{\mathrm{Oxygen}}{{\mathrm{O}}_2\left(\mathrm{g}\right)}\to \underset{\mathrm{Dioxide}}{\underset{\mathrm{Carbon}}{{\mathrm{CO}}_2\left(\mathrm{g}\right)}}$