how and when eneagy is released and absorbed during the change give example of each change
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Energy is used to break bonds in reactants, and energy is released when new bonds form in products. Endothermic reactions absorb energy, and exothermic reactions release energy. Whether a chemical reaction absorbs or releases energy, there is no overall change in the amount of energy during the reaction.
Combustion and respiration in biological systems are the most obvious examples. Some exothermic reactions require some energy to get them started, but then they release more energy than was needed for initiation.
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