1. Mention three differences between physical and chemical changes.
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Answer:
A chemical change is a permanent change. A Physical change affects only physical properties i.e. shape, size, etc. ... Some examples of physical change are freezing of water, melting of wax, boiling of water, etc. A few examples of chemical change are digestion of food, burning of coal, rusting, etc.
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Explanation:
chemical change :
it is permanent change
it is irreversible
it changes chemical properties of the material
Physical change :
it is temporary change
it is reversible
it changes physical properties of the material
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