Question

is burning of candle a reversible or irreversible change? is melting of wax a reversible or irreversible change?

Answer 1

Burning of a candle is mostly a reversible reaction. This means that is a physical change. However burning of a candle also exhibits some irreversible chemical changes.

Physical/reversible changes:

Melting of the candle wax is a physical/reversible change.

2) Chemical/irreversible change that take place:

The burning of candle wax to form hydrocarbons is a chemical change.

The burning of the candle wick is a chemical/irreversible change.

Answer 2

The burning of candle is not reversible, as the thread once burnt can not be reproduced even though the wax can be reshaped and used again

While the melting of wax is reversible, It can be again used after it has been melted as it gets back to its original form once the temperature gets lower.