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Chemical reactions involve the transformation of reactants into products with energy changes, often involving heat transfer.
The reactants and products are different substances. This signifies a chemical reaction has occurred, where the initial substances (reactants) transformed into new substances (products). In chemical reactions, the energy of the product is less than the energy of the reactants, leading to energy changes during the reaction. Heat is absorbed by reactants to form products, illustrating energy transfer in exothermic reactions.
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