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प्रश्न
Distinguish physical and chemical changes.
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उत्तर
1. Physical changes:
- No new substance is formed
- Reversible
- Change in physical properties like size, shape, state
- Melting of ice, tearing of paper freezing, evaporation vaporization
2. Chemical changes:
- New substance is formed
- Irreversible
- Change in properties of reactants and products
- Burning of paper, photosynthesis, digestion of food, rusting of iron
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संबंधित प्रश्न
Fill in the blank.
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State whether the following is physical or chemical changes.
growing of a piglet into a pig —
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(energy produced) dissolving sugar in water —
Write true or false
Burning of sugar is a temporary change.
Tick (√) the correct alternative from the choice given for the following statement.
A substance which can not sublime is
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Is the process of digestion a physical change?
Given reason:
Cutting of a cloth piece is a physical change, though it cannot be reversed.
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The occurrence of lightning.
Select the chemical changes from the following list of changes
Preparation of carbon dioxide from calcium carbonate & dilute hydrochloric acid.
Natural changes which take place in nature on their own, are beyond the control of human being.
