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प्रश्न
State whether the following is physical or chemical change.
Digestion of food —
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उत्तर
chemical change.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Cutting of trees
Explain the following giving an example.
Pure substance
Tick the most appropriate answer.
5. Photosynthesis requires
- heat energy.
- wind energy
- sunlight.
- sound energy
Write true or false for the statement
Decomposition of leaves is a fast change.
What are reversible and irreversible changes ? Give one example for each.
Write true or false
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Classify the following as physical or chemical change :
Formation of curd from milk
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 |
Classify the following as physical or chemical properties
Metallic sodium is soft enough to be cut with a knife.
Cutting a log of wood into pieces is a chemical change.
