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Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section

As fuels

19 practice questions

Start practising (19 questions)

Practice questions

11–19 of 19

  1. Question 11

    3 marks · Normal

    Explain why burning hydrocarbons in a poorly ventilated room can lead to serious health risks. In your answer, refer to the products formed during incomplete combustion.

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  2. Question 12

    4 marks · Normal

    The table below shows information about some fractions obtained from crude oil.

    Fractions from crude oil
    FractionApproximate Boiling Point (°C)Main Use
    Refinery gas< 40Bottled gas
    Gasoline40–100Fuel for cars
    Diesel oil250–350Fuel for lorries
    Bitumen> 350Road surfacing
    (a)

    Identify the fraction with the lowest boiling point and state its main use.

    [1 mark]
    (b)

    Which fraction is most likely to contain the largest hydrocarbon molecules? Explain your answer using data from the table.

    [2 marks]
    (c)

    Suggest why bitumen is not used as a fuel.

    [1 mark]
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  3. Question 13

    1 mark · Normal

    Which gas is a poisonous product of incomplete combustion of hydrocarbons?

    1. A.Carbon dioxide
    2. B.Nitrogen
    3. C.Carbon monoxide
    4. D.Oxygen
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  4. Question 14

    2 marks · Normal

    Name two main fractions produced by the fractional distillation of crude oil and give one use for each.

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  5. Question 15

    4 marks · Normal

    This question is about combustion of hydrocarbons and pollution.

    (a)

    Name the two conditions necessary for the complete combustion of a hydrocarbon.

    [1 mark]
    (b)

    Write the balanced word equation for the incomplete combustion of methane, producing carbon monoxide as one of the products.

    [1 mark]
    (c)

    Explain why carbon monoxide is produced during incomplete combustion and state one environmental or health effect it can cause.

    [2 marks]
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  6. Question 16

    3 marks · Normal

    A certain crude oil contains 1000 kg of hydrocarbons. When it is separated by fractional distillation at a refinery, the following fractions are collected:

    FractionPercentage by mass
    Refinery gas4%
    Gasoline20%
    Kerosene15%
    Diesel oil18%
    Fuel oil23%
    Bitumen20%

    Calculate the mass of the kerosene fraction obtained from this crude oil. Give your answer in kilograms.

    (a)

    Show your working and give your final answer with the correct unit.

    [3 marks]
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  7. Question 17

    2 marks · Hard

    State the trend in boiling point and position within the fractionating column for hydrocarbons with increasing chain length, giving a reason for each.

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  8. Question 18

    5 marks · Hard

    Pentane (C₅H₁₂) is a hydrocarbon fuel.

    (a)

    Write a balanced chemical equation, using formulae, for the complete combustion of pentane.

    [2 marks]
    (b)

    The supply of oxygen is reduced so that incomplete combustion occurs.

    (i)

    Name two products, other than water, that could be formed during incomplete combustion of pentane.

    [2 marks]
    (ii)

    Explain why less heat is released during incomplete combustion than during complete combustion.

    [1 mark]
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  9. Question 19

    2 marks · Hard

    State two reasons why the fractions obtained from crude oil by fractional distillation are useful as fuels.

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