write the differences between physical and chemical change
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Physical change is easily reversible i.e original substance can be recovered. Chemical changes are irreversible i.e. original substance cannot be recovered
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Physical change
- Physical change is easily reversible i.e original substance can be recovered.
- In a physical change, no new substance is formed.
- Generally, physical changes do not involve the production of energy.
- Some examples of physical change are freezing of water, melting of wax, boiling of water, etc.
Chemical change
- Chemical changes are irreversible i.e. original substance cannot be recovered.
- A chemical change is always accompanied by one or more new substance(s).
- Chemical changes usually involve the production of energy (which can be in the form of heat, light, sound, etc.)
- A few examples of chemical change are digestion of food, burning of coal, rusting, etc.
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