Question 3

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

Answer

1. No

It cannot be reversed because after sawing piece of wood would be in the same condition.

2. Yes

This can be reversed by freezing the ice candy again.

3. Yes

This can be reversed by vaporization.

4. No

This cannot be reversed because we cannot change the cooked food again into raw materials.

5. No

This cannot be reversed because ripening of mango is a natural process.

6. No

This cannot be reversed because souring of milk is due to bacteria which is an irreversible change.

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