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

Drawing and naming the carboxylic acids

19 practice questions

Start practising (19 questions)

Practice questions

11–19 of 19

  1. Question 11

    3 marks · Normal

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

    Answer and see the solution →

  2. Question 12

    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 →

  3. Question 13

    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
    Answer and check →

  4. Question 14

    2 marks · Normal

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

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  5. Question 15

    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]
    Answer and see the solution →

  6. Question 16

    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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  7. Question 17

    2 marks · Hard

    A student writes the name 'proponoic acid' for a carboxylic acid with three carbon atoms in a straight chain.

    State the correct IUPAC name for this acid. Give one reason for your answer.

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  8. Question 18

    5 marks · Hard

    Vinegar is commonly used in food and cleaning products.

    (a)

    Name the main carboxylic acid found in vinegar.

    [1 mark]
    (b)

    State its molecular formula.

    [1 mark]
    (c)

    Draw the displayed formula for this acid.

    [1 mark]
    (d)

    Suggest one property of this carboxylic acid that makes it useful in cleaning products.

    [1 mark]
    (e)

    Explain why this acid is classified as a carboxylic acid, referring to its structure.

    [1 mark]
    Answer and see the solution →

  9. Question 19

    2 marks · Hard

    Draw the structural formula for butanoic acid and state the total number of hydrogen atoms in one molecule.

    Answer and see the solution →