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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
Dissolving salt in water is a reversible change.
State whether the following is physical or chemical changes.
growing of a piglet into a pig —
True or false
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State one instance where water undergoes a physical change and one in which it undergoes a chemical change.
What is a physical change ? Give two examples of physical changes.
Give three reasons why melting of wax, is considered a physical change while burning of a candle, a chemical change.
State what is meant by the term – interconversion of matter. Is interconversion of matter a physical change or a chemical change.
Is a change of state of matter – a physical or a chemical change. Give reasons.
State which of the following terms connected with change of state of matter i.e.
(a) Melting
(b) Vaporisation
(c) Condensation
(d) Freezing
pertain to –
- Conversion of a liquid into a vapour or gas.
- Conversion of a liquid into a solid.
- Conversion of a solid into a liquid on heating.
Classify the following changes as physical and chemical changes
A rough piece of wood is sanded and polished resulting in change in texture, Rusting of a iron nail, Painting the grill, Bending a paper clip, Pounding silver into thin plate, Rolling the chappathi dough into thin wire, Occurrence of day and night, eruption of volcano, burning of matchstick, dosa from the batter, blinking of eyelids, occurrence of a thunderstorm, rotation of the earth, formation of eclipses.
| Sr. No. | Physical changes | Chemical changes |
| 1. | ||
| 2. |
