Explain the difference between physical and chemical changes, giving one example of each.

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Solution

Physical change Chemical change

No new substance is formed. New substance is formed.

The molecules of the substances remain the same before and after the change The new substances formed during the change exhibit different properties from that of the original substances.

Example: Heating of iron. When heated, a piece of iron expands, but it contracts to its original size when cooled. Example: Curdling of milk. The molecules of milk are changed in the curdling process to give curds.

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Physical change	Chemical change
No new substance is formed.	New substance is formed.
The molecules of the substances remain the same before and after the change	The new substances formed during the change exhibit different properties from that of the original substances.
Example: Heating of iron. When heated, a piece of iron expands, but it contracts to its original size when cooled.	Example: Curdling of milk. The molecules of milk are changed in the curdling process to give curds.