Most of the fuels used today are obtained from crude oil - Edexcel - GCSE Chemistry - Question 8 - 2019 - Paper 1
Question 8
Most of the fuels used today are obtained from crude oil.
(a) Which statement about crude oil is correct?
A crude oil is a compound of different hydrocarbons
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Worked Solution & Example Answer:Most of the fuels used today are obtained from crude oil - Edexcel - GCSE Chemistry - Question 8 - 2019 - Paper 1
Step 1
Which statement about crude oil is correct?
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Answer
The correct statement is B: crude oil is a mixture of hydrocarbons. This means that it consists of various hydrocarbons combined together, rather than being a single compound (A), containing only hydrocarbons of the same molecular formula (C), or an unlimited resource (D).
Step 2
State a use for kerosene.
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Answer
Kerosene is commonly used as fuel for aircraft, jets, lamps, and heating.
Step 3
State a use for diesel oil.
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Diesel oil is typically used in trucks, buses, and generators.
Step 4
State how this property for kerosene compares with the property for diesel oil.
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One property to compare could be the boiling point. Kerosene has a lower boiling point than diesel oil, which allows it to vaporize more easily and makes it suitable for applications like aviation fuel.
Step 5
Explain, using these formulae, why butane and pentane are neighbouring members of the same homologous series.
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Butane (C4H10) and pentane (C5H12) are neighbouring members because they differ by a CH2 unit. This consistent difference defines them as part of the same homologous series, where each consecutive member has one additional carbon atom.
Step 6
Calculate the mass of carbon in 100 g of butane.
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The molecular formula of butane is C4H10. The relative molecular mass is 58.0. The mass of carbon in 1 mole of butane (4 carbons) is 4 x 12.0 = 48.0 g. To find the mass of carbon in 100 g of butane:
