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प्रश्न
What will you take into account while identifying the following?
A physical change in a substance.
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उत्तर
Physical changes are those changes in which only the forms of substances get modified; the chemical natures and compositions of the substances involved are not altered.
Characteristics:
- No new substance is formed during a physical change.
- Most physical changes can be reversed easily.
- The chemical composition of a substance undergoing physical change remains the same.
संबंधित प्रश्न
A physical change is temporary. Explain.
State whether the following is physical or chemical changes.
water cycle in nature —
State whether the following is physical or chemical changes.
lightning —
State whether the following is physical or chemical change.
Digestion of food —
Write true or false
Earthquake is a desirable change.
True or false
Is the process of digestion a physical change?
Sublimation is classified as a physical change. Why ?
Photosynthesis is a natural process by which green plants manufacture food in the presence of sunlight.
State the conclusions which can be drawn, to represent photosynthesis as a physical or a chemical change.
Name the following:
The term involved in the change of state from – ‘water to ice’ – which is a physical change.
Match the following
| Sr. No. | A | B | C |
| 1. | Melting | Change of state from liquid to solid | Ticking of clock |
| 2. | Condensation | Change of state from liquid to gas | Formation of ice cube |
| 3. | Evaporation | Change of state from solid to liquid | Collecting flowers |
| 4. | Freezing | Change of state from gas to liquid | Ice cube to water |
| 5. | Periodic change | Occurs at irregular time intervals | Water to steam |
| 6. | Non-periodic change | Occurs at regular time intervals | Steam to water drops |
