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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 |
S.No. | Change | Can be reversed (Yes/No) |
1. 2 3 4 5 6 | The sawing of a piece of wood The melting of ice candy Dissolving sugar in water The cooking of food The ripening of a mango Souring of milk | No Yes Yes No No No |
Reversible Changes are those changes that can be reversed easily to form the 'original substance'.
Properties of reversible change:
It is a temporary change. The chemical properties of a substance are not affected by a reversible change. Most physical changes are reversible changes in nature.
For example, ice melts into water, and water freezes to form ice.
Irreversible changes are those changes where materials cannot be changed back to its original form.
For example, the burning of paper, and rusting of iron, etc.
Properties of irreversible change:
It is a permanent change. The chemical properties of the substance change. All chemical changes are irreversible changes.