Give reasons:
Freezing of water is a physical change.
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Freezing 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 converted to ice (solid) in freezing.
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Differentiate between Reversible and irreversible changes.
Differentiate between Slow and fast changes.
Evaporation of water is a physical change.
Burning of paper is a chemical change.