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प्रश्न
Fill in the blank
Burning of fuel is a _______ change.
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उत्तर
Burning of a fuel is a chemical change.
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संबंधित प्रश्न
What do you observe when :
a spoon of sugar is heated in a pan
State whether the following is physical or chemical changes.
passing electric current through a heater rod —
State whether the following is physical or chemical changes.
Boiling of an egg —
Fill in the blank
An earthquake is a _______ change.
Chemical changes are accompanied by changes in energy.
Under which different types can the following changes be classified?
Occurrence of an earthquake.
Under which different types can the following changes be classified?
Revolution of the earth around the sun.
Give reason.
While purchasing canned food, its expiry date should be checked.
Explain in brief the involvement of energy in physical and chemical changes.
Some changes are listed in the following table. For each change, write in the blank column, whether the change can be reversed or not.
| S. No. | Change | Can be reversed (Yes/No) |
| 1. | The sawing of a piece of wood | |
| 2. | The melting of ice candy | |
| 3. | Dissolving sugar in water | |
| 4. | The cooking of food | |
| 5. | The ripening of a mango | |
| 6. | Souring of milk |
