Question

Burning of candle involves both _______ and ________ changes.

• A. physical
• B. chemical

Answer 1

• When a candle burns, the wax melts.
• The melted wax solidifies to form wax.
• This is a physical change as chemical composition does not alter, the wax just changes its state.
• When a candle burns, the wick burns to form carbon dioxide(${\mathrm{CO}}_2$) and ash. This is a chemical change as the chemical composition alters and new substances are formed.

Hence, the burning of a candle involves both physical and chemical changes.