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प्रश्न
Select the chemical changes from the following list of changes
Preparation of carbon dioxide from calcium carbonate & dilute hydrochloric acid.
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उत्तर
Preparation of carbon dioxide from calcium carbonate and dilute hydrochloric acid is a CHEMICAL change as new K substance with new properties is formed, the change is permanent and irreversible.
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संबंधित प्रश्न
Tick the most appropriate answer.
3. Physical changes are
- permanent.
- periodic,
- temporary
- irreversible.
Make a list of different types of changes with example.
Is burning a physical change or a chemical change? Why?
State whether the following is physical or chemical changes.
water cycle in nature —
True or false
Is the process of digestion a physical change?
Given reason:
Burning of paper is a chemical 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 |
Sublimation of Iodine is a ______.
______ is the substance that is dissolved in a solvent.
Iron pipes coated with zinc do not get rusted easily.
