Question

When a candle burns, both physical and chemical changes take place. Identify these changes.​

Answer 1

Answer:

Irreversible and reversible change both will occur

Answer 2

Explanation:

Candles are made up of from wax and a cotton thread (called wick of candle). During burning of candle the molten wax (melting of wax in a physical process) rises through the cotton thread, undergoes combustion to produce carbon dioxide and water vapour. The cotton thread gets charred to Black mass.

Heat and Light energies are given out during the burning of candle.

It is not possible,

• to recover the burnt wax
• to recover the thread in the original form from the charred thread

Therefore, the burning of candle is a chemical and physical change.