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

General formulae

18 practice questions

Start practising (8 questions)

Practice questions

1–8 of 8 · Normal

  1. Question 1

    2 marks · Normal

    State what is meant by a homologous series. Give one feature that all members of a homologous series share.

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  2. Question 2

    4 marks · Normal

    The alcohol homologous series contains several compounds.

    (a)

    State the name of the functional group found in all alcohols.

    [1 mark]
    (b)

    Explain what is meant by the term 'functional group'.

    [2 marks]
    (c)

    Give the general formula for alcohols.

    [1 mark]
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  3. Question 3

    3 marks · Normal

    An alkane molecule has 8 carbon atoms. Use the general formula to calculate the number of hydrogen atoms in this molecule. Show your working.

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  4. Question 4

    3 marks · Normal

    An alkene and an alkane both contain 4 carbon atoms. Explain why they have different chemical properties. Refer to functional groups in your answer.

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  5. Question 5

    4 marks · Normal

    The table shows the first four members of the alkene homologous series:

    NameFormula
    EtheneC2H4
    PropeneC3H6
    ButeneC4H8
    PenteneC5H10
    (a)

    State the general formula for alkenes.

    [1 mark]
    (b)

    Name the next member of this series.

    [1 mark]
    (c)

    Give the molecular formula for hexene, the sixth member of the series.

    [1 mark]
    (d)

    Explain the pattern you see in the number of hydrogen atoms for each new member of the series.

    [1 mark]
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  6. Question 6

    1 mark · Normal

    Which of the following best describes a functional group in organic chemistry?

    1. A.A group of atoms that determines the chemical properties of a compound
    2. B.A compound that contains carbon and hydrogen atoms
    3. C.A general formula that shows the ratio of elements
    4. D.The number of carbon atoms in a homologous series
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  7. Question 7

    2 marks · Normal

    Give the general formula for alkanes and state the formula for butane.

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  8. Question 8

    4 marks · Normal

    Each member of a homologous series contains the same functional group. The alcohol series contains the functional group –OH.

    (a)

    Describe, with an example, what is meant by a functional group.

    [2 marks]
    (b)

    Explain why all alcohols undergo similar chemical reactions.

    [2 marks]
    Answer and see the solution →