Question

3 (a) Define chemical reaction.

Answer 1

Part 1: Chemical Reaction

• The process by which substances join or break apart chemically is called a chemical reaction.
• Reactants are substances that are consumed or react in a chemical reaction.
• Products are substances that are produced during a chemical reaction.

Part 2: Example of Chemical reaction

• In general, we write the chemical reaction :
  Reactant → Product
• The reactant is written on the left-hand side of the arrow, while the product is written on the right-hand side of the arrow. For example,
• $\underset{\mathrm{Hydrogen}\mathrm{Oxygen}\mathrm{Water}}{2{\mathrm{H}}_2+{\mathrm{O}}_2\to 2{\mathrm{H}}_2\mathrm{O}}$

Hydrogen and oxygen are the reactants as they are on the left-hand side of the arrow, and water is the product as it is on the right-hand side of the arrow.