Explain4 marksStandard
Iron is used as a catalyst in the Haber process for the manufacture of ammonia. Using the properties of transition elements, explain why iron is able to act as a catalyst in this reaction.
CAIE A Level Chemistry 9701 · Chemistry of transition elements
Chemistry of transition elements: explain question
How this question is marked
4 marks, so the mark scheme is looking for about 4 separate creditworthy points. Making the same point twice in different words earns it once.
Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.
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