Give reasons:
Evaporation of water is a physical change.
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Evaporation of water is a physical change because the change is reversible and the chemical composition of water remains the same. No new substance is formed. Only change of state occurs i.e. water (liquid) is changed to vapour (gaseous) state.
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Differentiate between Slow and fast changes.
Freezing of water is a physical change.
Burning of paper is a chemical change.
Cutting of a cloth piece is a physical change, although it cannot be reversed.