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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 fr... show full transcript
Worked Solution & Example Answer:Crude oil is a mixture of hydrocarbons - Edexcel - GCSE Chemistry - Question 3 - 2016 - Paper 1
Step 1
Step 2
State which oil well contains the greatest combined total of diesel oil and fuel oil.
Answer
To find the greatest combined total of diesel oil and fuel oil, we add the values for each 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
Thus, Oil well C contains the greatest combined total.
Step 3
State which oil well produces a crude oil containing the highest percentage of the high boiling point fractions.
Answer
The high boiling point fractions are primarily represented by fuel oil and bitumen. From the table:
- Oil well A: 26 (fuel) + 58 (bitumen) = 84%
- Oil well B: 28 (fuel) + 27 (bitumen) = 55%
- Oil well C: 30 (fuel) + 1 (bitumen) = 31%
Hence, Oil well A produces the crude oil with the highest percentage of high boiling point fractions.
Step 4
A sample of decane, C₁₀H₂₂, cracked using the apparatus in Figure 4.
Answer
The process of cracking decane involves breaking down larger hydrocarbon molecules into smaller ones, which can include alkenes and lighter alkanes. This can be done using heat and a suitable catalyst in the apparatus depicted, enhancing the production of gases like ethene.