Question

6. Melting of wax can be reversed whereas burning of wax cannot be reversed. Explain.

Answer 1

Part 1: Reversible and irreversible change

• Reversible change is the change that can be reversed and the original substance can be obtained back,
• Irreversible change is the change that cannot be reversed and the original substance cannot be obtained back.

Part 2: Melting of wax can be reversed whereas burning of wax cannot be reversed

• Melting of wax is a reversible change because on heating solid wax melts and melted wax becomes solid on cooling.
• The burning of wax is an irreversible change because we cannot get back the original candle.