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Heterogenous Catalysts

A heterogenous catalyst has a different physical state from its reactants. They are usually solids in contact with gaseous reactants.Reactant molecules are adsorbed onto the surface of the catalyst.Bonds within the reactant molecules break.New bonds form between the reactant molecules.The products desorb from the surface of the catalyst.

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Specification: OCR Chemistry A (H032), AS-level, 3.2.2 Reaction rates. Topic: Reaction Rates.

Key terms in this lesson

Catalyst
A substance that increases the rate of a chemical reaction without being used up, by providing an alternative reaction pathway with a lower activation energy.

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