When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.
Answer:
When a candle burns, both physical and chemical changes take place.
- Physical change - Melting of wax
- Chemical change - Burning of wick
Another example that can be considered is of LPG.
- The gas we use in the kitchen is called liquefied petroleum gas (LPG).
- In the cylinder it exists as a liquid .
- When it comes out from the cylinder it becomes a gas (Physical change) and then it burns (Chemical change) producing vapour and smoke.
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