AQA January 2010 – Unit 5 Q1

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section a answer all questions in the spaces provided areas outside the box will not be scanned for marking this question is about the use of transition metals as catalysts a state how a catalyst speeds up a chemical reaction marks b state the characteristic property of transition metals that enables them to act as catalysts in redox reactions mark c in the contact process for the conversion of sulfur dioxide into sulfur trioxide vanadium v oxide acts as a heterogeneous catalyst c i write two equations to show how the catalyst is involved in this reaction equation equation marks c ii suggest one reason why poisoning reduces the effectiveness of a heterogeneous catalyst mark c iii suggest how poisoning of a catalyst used in an industrial process can be minimised mark wmp jan chem

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