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

Drawing and naming the carboxylic acids

19 practice questions

Start practising (8 questions)

Practice questions

1–8 of 8 · Normal

  1. Question 1

    2 marks · Normal

    State the number of carbon atoms AND draw the structural formula of propanoic acid.

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  2. Question 2

    4 marks · Normal

    This question is about naming carboxylic acids.

    (a)

    Give the name of the carboxylic acid with molecular formula C4H8O2.

    [1 mark]
    (b)

    Write the name and structural formula of the carboxylic acid with molecular formula CH2O2.

    [2 marks]
    (c)

    State how you determine the name of a straight-chain carboxylic acid from its molecular formula.

    [1 mark]
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  3. Question 3

    3 marks · Normal

    Explain how you can identify whether a molecule is a carboxylic acid, using both its structural formula and its name.

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  4. Question 4

    4 marks · Normal

    The table below shows the molecular formulae of some carboxylic acids. Complete the table by filling in the missing names.

    Carboxylic acids to name
    Molecular formulaName
    C2H4O2
    C4H8O2
    CH2O2
    C3H6O2

    Write your answers in the table.

    Answer and see the solution →

  5. Question 5

    1 mark · Normal

    Which of the following gives the main component of vinegar?

    1. A.methanoic acid
    2. B.propanoic acid
    3. C.ethanoic acid
    4. D.butanoic acid
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  6. Question 6

    2 marks · Normal

    Give the molecular formula and the displayed formula for butanoic acid.

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  7. Question 7

    4 marks · Normal

    The table shows several unbranched carboxylic acids:

    NameMolecular formula
    methanoic acidCH2O2
    propanoic acidC3H6O2
    (a)

    Write the name and structural formula of the carboxylic acid with the molecular formula C2H4O2.

    [2 marks]
    (b)

    State the number of carbon atoms in butanoic acid and write its name following IUPAC conventions.

    [2 marks]
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  8. Question 8

    3 marks · Normal

    Vinegar contains ethanoic acid as its main component. A student finds that a 75 g bottle of vinegar contains 3.0 g of pure ethanoic acid.

    Calculate the percentage by mass of ethanoic acid in this sample of vinegar. Give your answer to 2 significant figures.

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