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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

11–20 of 785

  1. Question 11

    3 marks · Normal

    A hydrocarbon has an empirical formula of CH2 and a molar mass of 56 g/mol.

    Calculate its molecular formula. Show your working.

    Answer and see the solution →

  2. Question 12

    3 marks · Normal

    Explain how the displayed and molecular formulae of an organic molecule are different. Use an example in your answer.

    Answer and see the solution →

  3. Question 13

    4 marks · Normal

    The table shows some information about four organic compounds.

    Some organic compounds.
    CompoundMolecular formulaEmpirical formula
    butaneC4H10
    ethyneC2H2
    penteneCH2
    cyclopropaneCH2

    Complete the table. One compound may have more than one possible answer.

    Answer and see the solution →

  4. Question 14

    1 mark · Normal

    Which of the following is the correct displayed formula for methane?

    1. A.H–C≡C–H
    2. B.H–C–H (with each C bonded to four hydrogens)
    3. C.H–C–C–H (each C bonded to three H)
    4. D.CH4 (written as a condensation)
    Answer and check →

  5. Question 15

    2 marks · Normal

    Name the type of formula represented by each of the following:

    (i) C3H8

    (ii)

    Answer and see the solution →

  6. Question 16

    4 marks · Normal

    But-2-yne is an organic molecule containing four carbons and a triple bond.

    (a)

    Give the molecular formula for but-2-yne.

    [1 mark]
    (b)

    Give the empirical formula for but-2-yne.

    [1 mark]
    (c)

    Draw the displayed formula for but-2-yne.

    [2 marks]
    Answer and see the solution →

  7. Question 17

    2 marks · Hard

    The displayed formula of a molecule is shown below.

    Geometry diagram with points A, B, C, H, H, H, H, H, HHHHHHH

    Write the molecular formula and the empirical formula of this molecule.

    (a)

    Molecular formula:

    [1 mark]
    (b)

    Empirical formula:

    [1 mark]
    Answer and see the solution →

  8. Question 18

    5 marks · Hard

    A student investigates three hydrocarbons and records the following information:

    NameType of formulaFormula
    methanedisplayedH–C–H (each C bonded to four H)
    butenemolecularC4H8
    hexaneempiricalCH3
    (a)

    Give the molecular formula of methane.

    [1 mark]
    (b)

    Draw the displayed formula of butene.

    [2 marks]
    (c)

    Write the molecular formula of hexane.

    [1 mark]
    (d)

    State the type of formula for 'C4H8'.

    [1 mark]
    Answer and see the solution →

  9. Question 19

    2 marks · Hard

    A student writes the formula C5H12 for an organic compound.

    State the type of formula this is and explain what information it gives about the compound.

    (a)

    Type of formula:

    [1 mark]
    (b)

    Explanation:

    [1 mark]
    Answer and see the solution →

  10. Question 20

    1 mark · Easy

    State the name of the homologous series that has the general formula .

    Answer and see the solution →