1. The phenomenon by which two or more elements or compounds react to form new products with the absorption or release of energy is known as a chemical reaction.

    The phenomenon by which two or more elements or compounds react to form new products with the absorption or release of energy is known as a chemical reaction.

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  2. The phenomenon by which a chemical compound decomposes into two or more simple parts on heating is called chemical decomposition.

    The phenomenon by which a chemical compound decomposes into two or more simple parts on heating is called chemical decomposition.

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  3. The phenomenon by which a more electropositive element displaces a less electropositive element from its salt solution is called chemical displacement.

    The phenomenon by which a more electropositive element displaces a less electropositive element from its salt solution is called chemical displacement.

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