Describe5 marksStandard
Ethane reacts with chlorine in the presence of ultraviolet light to form chloroethane.
Describe the mechanism of this reaction, naming the three stages and giving an equation for each stage.
CAIE A Level Chemistry 9701 · Hydrocarbons
Hydrocarbons: 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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