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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
Classify the following as chemical or physical change:
Making a fruit salad with raw fruits
Write short answer.
Give an example of desirable change which can also be undesirable
Write short answer.
Sublimation is classified as a physical change. Why ?
Classify the following changes as physical or chemical:- melting of a solid (wax)
Write true or false
Rusting of iron is a chemical change.
Tick the most appropriate answer.
Physical changes are
Given reason:
Cutting of a cloth piece is a physical change, though it cannot be reversed.
State whether the following statement is true or false. If false write the correct statement.
Melting of ice is an exothermic, irreversible chemical change.
Potassium chloride is added to water and stirred. A salt solution is obtained, which is then boiled, leaving behind a residue.
- Is the above change physical or chemical?
- Name the residue which remains behind after the salt solution is boiled.
- Is the change reversible or not reversible?
- Are the composition and properties of the original substance altered?
- Give a reason why the above experimentation would not be possible if calcium carbonate was taken in place of potassium chloride.
Analogy:
Melting of ice: Physical change.
Popping of popcorn: ______.
