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<p>Physical and chemical reactions can be either <a href="page.php?w=Exergonic_reaction">exergonic</a> or <a href="page.php?w=Endergonic_reaction">endergonic</a>, but the activation energy is not related to the <a href="page.php?w=Spontaneous_process">spontaneity</a> of a reaction. The overall reaction energy change is not altered by the activation energy.</p>

<p><big> Negative activation energy </big></p>
<p>In some cases, rates of reaction decrease with increasing temperature. When following an approximately exponential relationship so the rate constant</p><p>
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