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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 generally consists of compounds that are lighter and have lower boiling points. Analyzing the provided options:
- A: C_nH_2n, C_mH_2mO - This includes compounds that might exist in gaseous form but may not be typical for the gaseous fractions.
- B: C_nH_2n, C_mBr, C_pH_pO - The presence of Br makes it less likely to be a gaseous component in crude oil.
- C: C_nH_2n, C_mH_2mO - This indicates similar models as A and shows potential gaseous compounds.
- D: C_nH_2nBr, C_mH_2mO - Br interferes with the typical gaseous hydrocarbons.
Overall, the best choice that includes probable gaseous hydrocarbons is A.
Step 2
State which oil well contains the greatest combined total of diesel oil and fuel oil.
Answer
To find the total of diesel oil and fuel oil for each oil well, we calculate as follows:
- Oil well A: Diesel oil (7) + Fuel oil (26) = 33
- Oil well B: Diesel oil (10) + Fuel oil (28) = 38
- Oil well C: Diesel oil (16) + Fuel oil (30) = 46
Thus, the oil well containing the greatest combined total of diesel oil and fuel oil is oil well C.
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 primarily consist of fuel oil and bitumen. Analyzing the data:
- Oil well A: Fuel oil (26) + Bitumen (58) = 84%
- Oil well B: Fuel oil (28) + Bitumen (27) = 55%
- Oil well C: Fuel oil (30) + Bitumen (1) = 31%
Therefore, the oil well that produces crude oil containing the highest percentage of the high boiling point fractions is oil well A.