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Crude oil is a mixture of hydrocarbons - Edexcel - GCSE Chemistry Combined Science - Question 3 - 2016 - Paper 1
Question 3
Crude oil is a mixture of hydrocarbons. It can be separated into fractions. (a) Which of these mixtures shows formulae of substances that could be in the gaseous fr... show full transcript
Worked Solution & Example Answer:Crude oil is a mixture of hydrocarbons - Edexcel - GCSE Chemistry Combined Science - Question 3 - 2016 - Paper 1
Step 1
Which of these mixtures shows formulae of substances that could be in the gaseous fraction of crude oil?
Answer
The gaseous fraction of crude oil primarily contains lighter hydrocarbons. Therefore, the correct answer is A: CₙHₘ, CₑHₕ, Br, CₕO, as it includes alkanes and potentially lighter compounds.
Step 2
State which oil well contains the greatest combined total of diesel oil and fuel oil.
Answer
To find the total for diesel oil and fuel oil, we add the percentages for each oil well:
- Oil Well A: 7% (diesel) + 26% (fuel) = 33%
- Oil Well B: 10% (diesel) + 28% (fuel) = 38%
- Oil Well C: 16% (diesel) + 30% (fuel) = 46% Hence, Oil Well C contains the greatest total of diesel oil and fuel oil.
Step 3
State which oil well produces a crude oil containing the highest percentage of the high boiling point fractions.
Answer
High boiling point fractions include diesel oil, fuel oil, and bitumen. For each oil well:
- Oil Well A: 7% (diesel) + 26% (fuel) + 58% (bitumen) = 91%
- Oil Well B: 10% (diesel) + 28% (fuel) + 27% (bitumen) = 65%
- Oil Well C: 16% (diesel) + 30% (fuel) + 1% (bitumen) = 47% Thus, Oil Well A produces the crude oil with the highest percentage of high boiling point fractions.