7 What are chemical changes?. Give example.
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A chemical reaction happens when one or more chemicals are changed into one or more other chemicals. Examples: iron and oxygen combining to make rust. vinegar and baking soda combining to make sodium acetate, carbon dioxide and water.
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The change in which new substances with new properties are formed is called as the chemical change. Chemical changes are usually irreversible , e.g. burning of wood, digestion of food ,etc.
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