Distinguish between physical change and chemical change.



physical change  chemical change
1. In a physical change, only physical properties such as colour, physical state, density, volume, etc. change; chemical properties remain unchanged. In a chemical change, the chemical composition and chemical properties undergo a change.
2. No new substance is formed in a physical change. A new substance is formed in a chemical change.
3. Very little or no energy in the form of heat, light or sound is usually absorbed or given out in a physical change. A chemical change is always accompanied by absorption or evolution of energy.
4. A physical change is a temporary change. A chemical change is a permanent change.
5. The original form of substance can be regained by simple physical methods. Original substance cannot be obtained by simple physical methods.
6. A physical change is reversible. A chemical change is irreversible.

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