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

Organic Chemistry

785 practice questions

Start practising (785 questions)

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Practice questions

311–320 of 785

  1. Question 311

    3 marks · Easy

    (a)

    Name the alkene with three carbon atoms.

    [1 mark]
    (b)

    Draw the displayed formula of this alkene.

    [1 mark]
    (c)

    Write the molecular formula of this alkene.

    [1 mark]
    Answer and see the solution →

  2. Question 312

    2 marks · Easy

    An alkene contains 5 carbon atoms per molecule. Calculate the number of hydrogen atoms in a molecule of this alkene.

    Answer and see the solution →

  3. Question 313

    2 marks · Easy

    Explain why butene (C4H8) can exist as several different structural isomers.

    Answer and see the solution →

  4. Question 314

    3 marks · Easy

    Some alkenes and their number of hydrogen atoms
    NameNumber of carbon atomsNumber of hydrogen atoms
    Ethene24
    Propene36
    Butene48
    (a)

    State the general formula for alkenes.

    [1 mark]
    (b)

    Complete the table for pentene.

    [1 mark]
    (c)

    Explain the pattern in the number of hydrogen atoms as the number of carbon atoms increases in alkenes.

    [1 mark]
    Answer and see the solution →

  5. Question 315

    1 mark · Easy

    State what feature of alkenes makes them unsaturated hydrocarbons.

    Answer and see the solution →

  6. Question 316

    3 marks · Easy

    (a)

    Draw the displayed formula of a straight-chain isomer of butene where the double bond is between the second and third carbon atoms.

    [2 marks]
    (b)

    Name this isomer.

    [1 mark]
    Answer and see the solution →

  7. Question 317

    2 marks · Easy

    Calculate the molecular formula of the alkene with 6 carbon atoms.

    Answer and see the solution →

  8. Question 318

    2 marks · Normal

    State the general formula for alkenes. Draw the displayed formula of propene.

    Answer and see the solution →

  9. Question 319

    4 marks · Normal

    Alkenes are described as unsaturated hydrocarbons.

    (a)

    Explain what is meant by 'unsaturated' in relation to alkenes.

    [2 marks]
    (b)

    State how alkenes differ in structure from alkanes.

    [2 marks]
    Answer and see the solution →

  10. Question 320

    3 marks · Normal

    A straight-chain alkene contains 7 carbon atoms. Calculate:

    (a)

    Write the molecular formula of this alkene.

    [1 mark]
    (b)

    Calculate the total number of hydrogen atoms in 5 molecules of this alkene.

    [2 marks]
    Answer and see the solution →