Explain4 marksStandard
A flash of lightning can convert molecules in the air into nitrogen monoxide, , even though is normally very unreactive.
Explain why is unreactive, and why the very high temperature of lightning allows to form.
CAIE A Level Chemistry 9701 · Nitrogen and sulfur
Nitrogen and sulfur: 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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