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

Alkenes

106 practice questions

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Practice questions

21–30 of 106

  1. Question 21

    3 marks · Easy

    (a)

    Describe the physical state of ethene, propene and butene at room temperature.

    [1 mark]
    (b)

    Explain how the boiling points of these alkenes change as the number of carbon atoms increases.

    [2 marks]
    Answer and see the solution →

  2. Question 22

    2 marks · Easy

    An alkene molecule contains 10 carbon atoms. Calculate the number of hydrogen atoms it contains. Show your working.

    Answer and see the solution →

  3. Question 23

    2 marks · Easy

    Explain why propene has a higher boiling point than ethene.

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  4. Question 24

    3 marks · Easy

    Some information about alkenes.
    NameNumber of Hydrogen atoms
    Ethene4
    Butene8
    Alkene X12
    (a)

    For each compound, state its molecular formula.

    [2 marks]
    (b)

    Name alkene X.

    [1 mark]
    Answer and see the solution →

  5. Question 25

    1 mark · Easy

    State the physical state of butene at room temperature.

    Answer and see the solution →

  6. Question 26

    3 marks · Easy

    (a)

    Write the general formula for alkenes.

    [1 mark]
    (b)

    Write the molecular formula for the alkene with 7 carbon atoms.

    [1 mark]
    (c)

    How many hydrogen atoms are there in this molecule?

    [1 mark]
    Answer and see the solution →

  7. Question 27

    2 marks · Easy

    The boiling point of ethene is -104°C, and that of propene is -47°C. Calculate the difference in boiling points between these two alkenes.

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  8. Question 28

    2 marks · Normal

    State the general formula for alkenes. Write the molecular formula for the alkene with six carbon atoms.

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  9. Question 29

    4 marks · Normal

    Ethene, propene and butene are alkenes.

    (a)

    Complete the table to show the number of carbon (C) and hydrogen (H) atoms in each alkene.

    AlkeneNumber of C atomsNumber of H atoms
    Ethene2
    Propene
    Butene
    [3 marks]
    (b)

    State the physical state (solid, liquid or gas) of these alkenes at room temperature.

    [1 mark]
    Answer and see the solution →

  10. Question 30

    3 marks · Normal

    An alkene molecule contains 14 hydrogen atoms. Calculate the number of carbon atoms it contains. Show your working.

    Answer and see the solution →