As fuels
2 marks · NormalState the name of the process used to separate crude oil into useful fractions and give one reason why crude oil must be separated in this way.
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Also accept: fractional distillation; to obtain useful products / fractions with different uses / because crude oil by itself has no direct use
Common mistakes: just 'distillation' (not specific enough)
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Marking points
B1 · 1 mark · Fractional distillation named as the process.
B2 · 1 mark · States crude oil is separated because it is not useful in its raw form or to obtain products with different (or defined) uses.
Worked solution
The process is called fractional distillation.
Crude oil must be separated because it has no useful direct uses and needs to be split into fractions with different uses.