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(a) What is a physical change? Give two examples of physical changes.
(b) What is a chemical change? Give two examples of chemical changes.
(a) Physical change: Physical change is a change in which no new substances are formed. These are temporary changes, which are easily reversible. The substance involved in a physical change does not lose its identity.
Examples:
- Water, if boiled, can be cooled and condensed.
- Mixing iron filings with sand is a physical change because they can be separated by a magnet.
(b) Chemical change: Chemical changes occur when a substance combines with another to form a new substance. The process is called chemical reactions and, in general, is not reversible except by further chemical reactions.
Examples:
- Rusting of iron
- Burning of paper
Updated on: 10-Oct-2022
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