Describe5 marksStandard
Describe how ethene is produced, and describe one reaction of ethene with each of the following reagents: hydrogen, steam, and cold dilute acidified potassium manganate(VII). State the conditions needed in each case.
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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