Exam-style Questions: Products From Crude Oil

 

  1. Crude oil is described as a fossil fuel but it is much more important than that as many plastics have crude oil as a raw material.

    a) Name two other fossil fuels.

    (2 marks)

    b) Crude oil is mixture of different 'hydrocarbons'.

    Explain the term 'hydrocarbon'.

    (1 mark)

    c) Describe how crude oil was formed.

    (4 marks)

    (Marks available: 7)

    Answer

     

    Answer outline and marking scheme for question: 1

    a) Coal.

    (1 mark)

    Natural gas.

    (1 mark)

    b) A compound that contains hydrogen and carbon only.

    (1 mark)

    c) Should contain:

    • Sea animals died and sank to bottom of sea where they were buried.

    (1 mark)

    • Bodies did not decay as no oxygen for bacteria to survive.

    (1 mark)

    • Remains placed under high temperatures and high pressures.

    (1 mark)

    • Process takes millions of years.

    (1 mark)

    (Total = 7 marks)

  2. The method of separating crude oil in to useful substances is shown below:

    Exam-style Questions

    a) What name is given to the process of separating crude oil?

    (1 mark)

    b) Which area of the column shown, A, B or C is the hottest?

    (1 mark)

    c) Which of the materials shown on the left of the diagram has the shortest carbon chains?

    (1 mark)

    (Marks available: 3)

    Answer

     

    Answer outline and marking scheme for question: 2

    a) Fractional Distillation.

    (1 mark)

    b) C.

    (1 mark)

    c) Petroleum gas.

    (1 mark)

    (Total = 3 marks)

  3. The diagram below shows one of the components of crude oil:

    Exam-style Questions

    a) What is the name of this substance?

    (1 mark)

    b) What name do we give to chemicals such as this which have a C=C?

    (1 mark)

    c) What test could be used to show you have C=C?

    (1 marks)

    d) Draw two isomers of this compound.

    (2 marks)

    (Marks available: 5)

    Answer

     

    Answer outline and marking scheme for question: 3

    a) Butene.

    (1 mark)

    b) Unsaturated (accept alkene).

    (1 mark)

    c) Bromine water.

    (1 mark)

    (Accept potassium permanganate/potassium manganate (VII)).

    Decolourised/goes from orange/brown (purple if KMnO4) to colourless.

    d)

    Exam-style Questions

    (2 marks)

    (Total = 5 marks)

  4. A lot of useful materials are produced from crude oil. Unfortunately, there is not enough of the most useful materials in crude oil. Chemists take the longer chained molecules and break them down in to shorter chained molecules.

    a) What name is given to this process?

    (1 mark)

    b) Complete the equation below to show what could be made if a molecule of dodecane was broken down.

    C12H26 → C4H10 +

    (1 mark)

    c) To what group of hydrocarbons does C4H10 belong?

    (1 mark)

    (Marks available: 3)

    Answer

     

    Answer outline and marking scheme for question: 4

    a) Cracking.

    (1 mark)

    b) C8H16

    (1 mark)

    c) Alkanes.

    (1 mark)

    (Total = 3 marks)