Biology / Bio 0498 · Atom · ~20 seconds
Activation Energy
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Activation energy is the input every reaction needs to reach its unstable transition state, even one that releases energy.
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Sugar sits stably in a bowl because breaking it down, though exergonic overall, needs an activation-energy push it rarely gets at room temperature.
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Activation energy is not part of a reaction's net free-energy change — it is recovered once the transition state resolves.