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

Displayed formulae

19 practice questions

Start practising (3 questions)

Practice questions

1–3 of 3 · Hard

  1. Question 1

    2 marks · Hard

    Figure 1 shows the displayed formula of an organic molecule containing three carbon atoms.

    Geometry diagram with points C, C, C, H, H, H, H, H, H, HCCCHHHHHHH
    Displayed formula of an organic molecule

    Describe how you can use this displayed formula to: (i) identify the connectivity (how atoms are joined together) and (ii) determine the types of bonds present in the molecule.

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  2. Question 2

    5 marks · Hard

    Answer the following questions about typical bonding in displayed formulae of organic compounds.

    (a)

    State the typical number of bonds formed by a carbon atom in a displayed formula.

    [1 mark]
    (b)

    State the typical number of bonds formed by a hydrogen atom in a displayed formula.

    [1 mark]
    (c)

    State the typical number of bonds formed by an oxygen atom in a displayed formula.

    [1 mark]
    (d)

    State the typical number of bonds formed by a halogen atom (such as chlorine) in a displayed formula.

    [1 mark]
    (e)

    Explain why a carbon atom in organic molecules always forms this number of bonds.

    [1 mark]
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  3. Question 3

    2 marks · Hard

    Draw the displayed formula for ethene (aTeX][\ce{C2H4}]).

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