Chemistry
Define:
(a) a physical change
(b) a chemical change
Phy & Chem Changes
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Answer
(a) A physical change is a change in which no new substance is formed and the chemical composition of the original substance remains the same, even though some of its physical properties like state, color, shape, size, appearance etc. may change.
(b) A chemical change is a permanent change in which new substances are formed whose chemical composition and physical and chemical properties are different from those of the original substance.
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(f) Melting of wax
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(b) Natural, periodic change
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