Difference between Physical and Chemical Changes

Physical and chemical change of Class 7

Difference between physical and chemical change

Physical Change Chemical Change
1. The change takes place only in the state, texture, colour, electrical or magnetic properties or solubility, etc. However, molecular properties (composition) do not change. 1. The change takes place in the state, texture, colour, electrical or magnetic properties along with the change in its molecular properties (i.e. its molecular arrangement changes).
2. The specific properties of the substance remain unaltered after the physical change. 2. The specific properties of the substance change completely after the chemical change.
3. No new substances are produced. 3. Always new substances are produced.
4. There is no change in weight, if a substance is undergoing a physical change. 4. There is always a change in apparent weight, when a substance undergoes a chemical change.
5. There is no net absorption or release of energy (such as heat or light energy) during a physical change. 5. There is always a net absorption or release of energy during a chemical change.
6. It is a temporary change and is usually reversed by removing the cause of the change. 6. It is a permanent change and cannot be reversed by removing the cause of the change.

chemical change revision

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