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प्रश्न
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 |
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उत्तर
| Sr. No. | A | B | C |
| 1. | Melting | Change of state from liquid to solid | Ice cube to water |
| 2. | Condensation | Change of state from liquid to gas | Steam to water drops |
| 3. | Evaporation | Change of state from solid to liquid | Water to steam |
| 4. | Freezing | Change of state from gas to liquid | Formation of ice cube |
| 5. | Periodic change | Occurs at irregular time intervals | Ticking of clock |
| 6. | Non-periodic change | Occurs at regular time intervals | Collecting flowers |
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संबंधित प्रश्न
Changes in which only ______ properties of a substance change are called physical changes.
Name two reversible changes.
Classify the following as a physical or a chemical change.
Boiling of water
Differentiate between a physical change and a chemical change with reference to – Formation of products.
Explain the term – ‘sublimation’. Is sublimation of naphthalene – a physical or a chemical change. Give reasons.
Compare the energy changes involved during a physical and a chemical change.
Classify the following changes as physical and chemical changes
A rough piece of wood is sanded and polished resulting in change in texture, Rusting of a iron nail, Painting the grill, Bending a paper clip, Pounding silver into thin plate, Rolling the chappathi dough into thin wire, Occurrence of day and night, eruption of volcano, burning of matchstick, dosa from the batter, blinking of eyelids, occurrence of a thunderstorm, rotation of the earth, formation of eclipses.
| Sr. No. | Physical changes | Chemical changes |
| 1. | ||
| 2. |
Classify the following as physical or chemical properties
Metallic sodium is soft enough to be cut with a knife.
State whether the following statement is true or false:
Anaerobic bacteria digest animal waste and produce biogas.
A physical change is generally____________.
