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Crude oil is found in the Earth’s crust - Edexcel - GCSE Chemistry Combined Science - Question 3 - 2018 - Paper 1
Question 3
Crude oil is found in the Earth’s crust. (a) Which of the statements about crude oil is correct? A. crude oil is a finite resource B. crude oil is a mixture of the... show full transcript
Worked Solution & Example Answer:Crude oil is found in the Earth’s crust - Edexcel - GCSE Chemistry Combined Science - Question 3 - 2018 - Paper 1
Step 1
Which of the statements about crude oil is correct?
Answer
The only statement that is correct is A: crude oil is a finite resource. This is true because crude oil is a limited natural resource that cannot be replenished quickly. The other statements are incorrect for the following reasons:
- B: Crude oil is not a mixture of just hydrogen and carbon, but rather a mixture of various hydrocarbons and other organic compounds.
- C: While some molecules in crude oil can have carbon rings, many are linear or branched chains as well; thus, this statement is misleading.
- D: While crude oil is indeed used as a fuel, it cannot be categorically claimed that it is solely used in cars.
Step 2
Step 3
Use a word from the box to complete each of the sentences about the fractional distillation of crude oil.
Answer
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Before crude oil is passed into the column it is heated. This step is necessary to convert the crude oil into a vaporized form so that it can be separated into fractions based on boiling points.
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The vapour has been condensed once it rises and cools enough for it to return to a liquid form. During this process, different fractions are collected at various levels of the distillation column.