Activation Energy
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
Activation energy is the input every reaction needs to reach its unstable transition state, even one that releases energy.
Show
Sugar sits stably in a bowl because breaking it down, though exergonic overall, needs an activation-energy push it rarely gets at room temperature.
Watch for
Activation energy is not part of a reaction's net free-energy change — it is recovered once the transition state resolves.