respiration is a thermal decomposition reaction so it is endothermic but how it is exothermic as it releases energy.so how come any reaction be endothermic and exothermic at the same time?
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In an endothermic reaction, it takes more energy to beak bonds in the reactants than is released when new bonds form in the products. ... All chemical reactions, even exothermic reactions, need activation energy to get started. Activation energy is needed to bring reactants together so they can react.
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In an endothermic reaction, heat is used for the reaction to occur. The heat energy breaks the bonds in the substance causing the reaction. As the heat is absorbed, the product will be colder. This is actually one of the key characteristics of an endothermic reaction.
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