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प्रश्न
State whether the following is physical or chemical changes.
Melting of wax —
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उत्तर
physical change.
APPEARS IN
संबंधित प्रश्न
State whether the following is physical or chemical changes.
burning of wood -
Distinguish between the following.
Natural change and man-made change
Fill in the blanks with the appropriate words of the statement given below:
Chemical changes may involve exchange of energy in the form of __________ and _________.
How can a change occur in a substance?
Observe the picture containing a kettle and note that it has salt water in it and answer the following questions:
- What is name of the process that is done to the kettle?
- What will happen to the content of the kettle?
- What kind of change is occurring on the cold surface of the metal plate?
- What can you say about the quality of water that is obtained in the beaker?
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 |
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.
What is the change?
Cut vegetables turn brown when exposed to air, this is due to ______.
