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A pair of reacting molecules must collide, with a combined energy greater than the activation
enthalpy for the reaction in order to make a successful collision. Catalysts are used in order to
overcome the activation energy barrier more easily.

A catalyst is a substance which speeds up the rate…

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Catalyst Poisoning

Catalysts can be poisoned so they no longer function properly.

Many substances which are poisonous to humans operate by blocking an enzyme-catalysed reaction.

In heterogeneous catalysis, the `poison' molecules are adsorbed more strongly to the catalyst
surface than the reactant molecules.

The catalyst cannot catalyse a reaction of…


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