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प्रश्न
Give four difference between physical and chemical changes.
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उत्तर
The differences are Physical and Chemical Changes:
Physical change
- In a physical change no new substance is formed and the chemical composition of substance remains same. There are changes only in physical properties and state.
- Temporaiy change which can be reversed by simple physical methods.
- Weight of original substance doesn’t change
- Energy like heat, light etc. may or may not be absorbed or released
Chemical change
- In a chemical change new substance with entirely different chemical composition and properties is formed.
- Permanent change and irreversible
- Weight of original substances may increase or decrease
- Energy like heat, light etc. are given out or absorbed.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Boiling of water to form steam.
State the various conditions that favour the process of evaporation.
Fill in the blank.
Growing of a seedling into a plant is _______ change.
True or false
Is the process of digestion a physical change?
Classify the Following as a Physical Or a Chemical Change.
Formation of Clouds
Name the following:
The type of change physical or chemical involved – ‘when a substance undergoes a change in state, colour or size’.
Give a reason why rusting of iron is a chemical change but, the magnetization of iron is a physical change.
Stretching gold coin into a ring is a ______ 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 |
Cutting a log of wood into pieces is a chemical change.
