AQA Jun 2010 Paper 5 Q3

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do not write outside the box transition metal ions can act as homogeneous catalysts in redox reactions for example iron ii ions catalyse the reaction between peroxodisulfate s o iodide ions ions and a state the meaning of the term homogeneous mark b suggest why ions from s block elements do not usually act as catalysts mark c write an equation for the overall reaction that occurs in aqueous solution between s o ions and i ions mark d give one reason why in the absence of a catalyst the activation energy for the reaction between s o ions and i ions is high mark e write two equations to show how fe ions can catalyse the reaction between s o these reactions is low ions and i ions suggest one reason why the activation energy for each of equation equation reason marks wmp jun chem f explain why fe ions are as effective as fe ions in catalysing this reaction mark do not write outside the box turn over for the next question turn over wmp jun chem

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