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प्रश्न
What is a physical change ? Give two examples of physical changes.
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उत्तर
Physical change: These are changes in which no new substances are formed. These are temporary changes, which are easily reversible. The substance, which is involved in a physical change, does not lose its identity.
Examples:
- Water, if boiled, can be cooled and condensed.
- Mixing of iron fillings with sand is a physical change because they can be separated by a magnet.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Melting of butter in a pan
Is burning a physical change or a chemical change? Why?
State four differences between physical and chemical changes.
State whether the following is physical or chemical changes.
heating a mixture of iron filings and sulphur—
Give the main differences between physical changes and chemical changes.
Classify the following as a physical or a chemical change.
Boiling of water
Name the following:
The type of change physical or chemical involved – ‘when a substance undergoes a change in state, colour or size’.
Give the reason why the following is considered as chemical changes.
Copper carbonate on heat gives copper oxide and carbon dioxide.
Water is the universal solvent. Why?
Keeping a stone in sunlight for few hours is ______.
