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प्रश्न
Classify the following as chemical or physical change:
Melting of butter in a pan
पर्याय
Chemical change
Physical change
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उत्तर
Physical change
Explanation:
Melting butter in a pan is a physical transformation since there is no change in the chemical composition of butter; only its physical state changes from solid to liquid.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Boiling of water to form steam.
Classify the following as chemical or physical change:
Dissolving common salt in water.
Photosynthesis cannot take place at night.
What do you observe when :
lighted match stick is brought near the mouth of the test tube containing hydrogen gas.
State whether the following is physical or chemical changes.
photosynthesis —
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.
Name the following.
The salt obtained when a chemical change takes place on the addition of iron to dilute sulphuric acid.
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 |
What type of energy changes is associated when ice melts?
State whether the following statement is true or false:
Anaerobic bacteria digest animal waste and produce biogas.
