Explain4 marksStandard
Ethane reacts with chlorine in the presence of ultraviolet light to form chloroethane. Explain the mechanism of this reaction, referring to the roles of the initiation, propagation and termination steps.
CAIE A Level Chemistry 9701 · Hydrocarbons
Hydrocarbons: 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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