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प्रश्न
State whether the following is physical or chemical changes.
Melting of wax —
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उत्तर
physical change.
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संबंधित प्रश्न
State whether the following is physical or chemical changes.
burning of wood -
True or false?
During a physical change energy is either given out or absorbed by the system.
True or false?
In a chemical change, rearrangement of molecules and atoms involves some energy changes.
Fill in the blank
An earthquake is a _______ change.
Melting of solid (wax) is a physical change.
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 |
Paper, LPG, CNG petrol, etc, are ______ substances.
The difference between initial state and the final state is called change.
______ is the process in which something becomes different from what it was earlier.
