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Crude oil is a mixture of hydrocarbons - Edexcel - GCSE Chemistry - 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 ... show full transcript
Worked Solution & Example Answer:Crude oil is a mixture of hydrocarbons - Edexcel - GCSE Chemistry - 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 typically consists of light hydrocarbons, which are generally alkanes. Option A, CₙHₖ, CₙHₖ, Br, CₙHₖO includes formulas potentially indicating organic compounds with halogens and oxygen which are not prevalent in gases. Option B, CₙHₖ, CₙHₖ, CₙHₖO, also implies larger compounds not typically found in gaseous fractions. Option C, CₙHₖ, CₙHₖ, CₙHₖO, suggests a mixture of hydrocarbons but includes oxygen, indicating larger or heavier compounds. Option D, CₙHₖ, Br, CₙHₖO can indicate halogenated hydrocarbons which are also less likely found in gaseous fractions. Therefore, the correct option is D.
Step 2
State which oil well contains the greatest combined total of diesel oil and fuel oil.
Answer
To determine which oil well has the greatest combined total of diesel oil and fuel oil, we will sum the values from the provided table:
- Oil well A: 7 (diesel) + 26 (fuel) = 33
- Oil well B: 10 (diesel) + 28 (fuel) = 38
- Oil well C: 16 (diesel) + 30 (fuel) = 46
Thus, oil well C contains the greatest combined total of diesel oil and fuel oil, with a total of 46.
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 fuel oil and bitumen. Assessing their totals gives:
- Oil well A: 26 (fuel) + 58 (bitumen) = 84
- Oil well B: 28 (fuel) + 27 (bitumen) = 55
- Oil well C: 30 (fuel) + 1 (bitumen) = 31
Therefore, oil well A produces a crude oil containing the highest percentage of the high boiling point fractions, with a total of 84.