When a candle burns, both physical and chemical change take place. How?

Burning of a candle is a physical change and a chemical change.

Physical changes:

While burning the candle the wax slowly melts as the candle gets smaller and this molten wax can be again solidified and will make it into a candle.which means that it is a reversible change.

Chemical changes:

The heat produced by the candle consumes both the oxygen in an atmosphere, as well as the fuels coming from the flame. This will then lead to carbon dioxide emissions produced by the flame. This is an irreversible change.