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प्रश्न
Give the main differences between physical changes and chemical changes.
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उत्तर
Important differences between a physical and a chemical change are given below:
| PHYSIAL CHANGE | CHEMICAL CHANGE |
| 1. No new substance is formed. | 1. A new substance is formed. |
| 2. Physical change is reversible. | 2. Chemical change is usually irreversible. |
| 3. It is a temporary change. | 3. It is a permanent change. |
| 4. No heat energy is evolved or absorbed. | 4. Heat energy is evolved or consumed in a large amount. |
| 5. Examples: Melting of ice, formation of clouds, tearing of cloth etc. | 5. Examples: Rusting of iron, ripening of fruits, cooking of food etc. |
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संबंधित प्रश्न
A physical change is temporary. Explain.
Write true or false
Decomposition of leaves is a fast change.
Classify the following as physical or chemical change :
Formation of curd from milk
Which of the following are chemical changes ?
- decaying of wood
- burning of wood
- sawing of wood
- hammering of nail into wood
Classify the following as a physical or a chemical change.
Manufacture of salt from sea water
Distinguish between the following.
Physical change and chemical change
What will you take into account while identifying the following?
A physical change in a substance.
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 |
A physical change is generally____________.
Give an example to justify the statement that physical changes can be reversible as well as irreversible.
