The origin of crude oil
2 marks · NormalState what crude oil is and name the two elements found in all hydrocarbons in crude oil.
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Crude oil is a mixture of hydrocarbons. The two elements found in all hydrocarbons are carbon and hydrogen.
Also accept: Crude oil is a mixture containing only hydrocarbons.; Hydrocarbons contain carbon and hydrogen atoms.
Common mistakes: Naming oxygen, nitrogen, or other elements; Calling crude oil a compound, not a mixture
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Marking points
B1 · 1 mark · States that crude oil is a mixture of hydrocarbons.
B2 · 1 mark · Names both carbon and hydrogen as the elements in hydrocarbons.
Worked solution
Crude oil is a mixture of hydrocarbons.
The two elements found in all hydrocarbons are carbon and hydrogen.