define a physical change.
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Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds.
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A change which occur when a substance or an object undergo a change which does not change any chemical composition of that substance is called a physical change.
examples:breaking of a glass,melting of ice etc.
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