Biology / Bio 0500 · Atom · ~20 seconds
Catalysis Lowers Activation Energy
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A catalyst speeds a reaction by lowering its activation energy, without being consumed and without changing the reaction's overall free-energy change.
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Heating a fuel to ignition supplies activation energy directly; a catalyst instead lowers how much energy the reaction needs in the first place.
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Lowering activation energy changes how fast a reaction proceeds, never whether that reaction is exergonic or endergonic.