Describe5 marksStandard
In the exhaust system of a petrol car, a catalytic converter removes oxides of nitrogen from the exhaust gases. Explain how the catalytic converter removes these oxides and why their removal is necessary.
CAIE A Level Chemistry 9701 · Nitrogen and sulfur
Nitrogen and sulfur: describe question
How this question is marked
5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.
Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.
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