Gibbs Free Energy and Exergonic/Endergonic Reactions
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Gibbs free energy is a reaction's usable energy; an exergonic reaction releases free energy and proceeds unaided, while an endergonic reaction needs an input.
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Glucose breakdown is exergonic; building glucose from carbon dioxide is endergonic and needs an energy source.
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A negative free-energy change marks exergonic; a positive one marks endergonic — the sign, not the size, decides.