what is chemical change .
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A chemical change is a permanent change in which the chemical composition of a substance is changed and one or more new substances with different chemical composition and different properties are formed .
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a Change in which the chemical properties and the composition of a substance is changed and new substances are formed, is called a chemical change or a chemical reaction.
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eg. burning of wood, digestion of food,reaction of dilute sulphuric acid with zinc,etc
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