Question

Why is burning of paper a chemical change?

Answer 1

Chemical change:

• A change in which the chemical composition of a substance changes and a new substance is formed is known as chemical change. For example, curdling of milk, rusting of iron.
• Burning of paper is a chemical change because as a result of burning, ash is formed as a new chemical substance.
• During burning, Carbon react with hydrogen and oxygen, turning them into Carbon dioxide (${\mathrm{CO}}_2$) and water.
• These changes are irreversible and ash can not be converted back to the original substance.
• Burning is an example of exothermic change.