Activation energy (Ea) is the minimum energy required for a chemical reaction to occur — the energy barrier reactants must overcome to form products. It can be calculated from reaction rate constants at two temperatures using the Arrhenius equation.
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Did You Know?
Enzymes are biological catalysts that lower activation energy — often by factors of 10⁶ to 10¹². Without enzymes, many biological reactions would take millions of years at body temperature.
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