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Activation Energy

Activation Energy
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Description: Most reactions, including exergonic ones such as burning wood cellulose, will not begin with-out an input of activation energy, which is shown in the graph above as a bump in a free energy hill. Reactants in this example have more energy than the products. Activation energy keeps this and other exergonic reactions from starting spontaneously.
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Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=49503
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