GENERAL KNOWLEDGE

Detailed explanation-1: -The burning of a candle is a chemical change whereas the melting of a candle is a physical change.

Detailed explanation-2: -The burning of a candle is an example of both physical and chemical changes.

Detailed explanation-3: -A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity. Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding.

Detailed explanation-4: -Another physical property of a candle is its melting point which is the temperature required for it to turn from its solid form to liquid wax. Paraffin wax, the main component of a candle, has a melting point of around 46°C to 68 °C.

Detailed explanation-5: -Here, the wax has changed from solid to liquid. This is a physical change. The wax near wick of the candle burns and gives new substances like carbon dioxide, carbon soot, water vapour, heat and light. This is a chemical change.