Question

Burning of candle is an irreversible change in which wax burns to produce light. During this process, the length of the candle changes. Explain. Why???

Answer 1

Answer:

In the process of burning of wax, it is neither the solid wax nor the liquid wax that is burnt. Wax vapours are burnt giving off heat and light. Once burned, it is not possible to get back the wax. Burning of wax is a chemical process and hence, is irreversible.