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<p>the unstable transition state. Reactions without catalysts need a higher input of energy to achieve the transition state. Non-catalyzed reactions do not have free energy available from active site stabilizing interactions, such as catalytic enzyme reactions.</p>

<p><big> Relationship with Gibbs energy of activation </big></p>
<p>In the <a href="page.php?w=Arrhenius_equation">Arrhenius equation</a>, the term activation energy (E<sub>a</sub>) is used to describe the energy required <a href="page.php?w=reaction_coordinate">to reach the</a> <a href="page.php?w=transition_state">transition state</a>,</p><p>
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