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. |
| S. No. | Change | Can be reversed (Yes/No) |
| 1. | The sawing of a piece of wood. | No. |
| 2. | The melting of ice candy. | Yes. |
| 3. | Dissolving sugar in water. | Yes. |
| 4. | The cooking of food. | No. |
| 5. | The ripening of a mango. | No. |
| 6. | Souring of milk. | No. |