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

Ionic Bonding

143 practice questions

Start practising (24 questions)

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Practice questions

21–24 of 24 · Hard

  1. Question 21

    2 marks · Hard

    State the two conditions under which an ionic compound can conduct electricity.

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  2. Question 22

    7 marks · Hard

    Sodium chloride (NaCl) is a typical ionic compound. The arrangement of ions in its structure and the structure's properties explain many features of ionic solids.

    (a)

    Describe how the ions are arranged in the giant ionic lattice of sodium chloride.

    [2 marks]
    (b)

    Explain why sodium chloride has a high melting point, referring to its structure.

    [2 marks]
    (c)

    State one feature of the overall appearance of pure sodium chloride crystals and relate it to the arrangement of ions in its lattice.

    [2 marks]
    (d)

    Give one other property (besides melting point) that is explained by the structure of giant ionic lattices, and state how the arrangement of ions accounts for it.

    [1 mark]
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  3. Question 23

    7 marks · Hard

    Magnesium oxide (MgO) and sodium chloride (NaCl) both form giant ionic lattices, but their melting points are very different.

    (a)

    Describe the structure of a giant ionic lattice, using magnesium oxide as an example.

    [2 marks]
    (b)

    Explain why magnesium oxide has a much higher melting point than sodium chloride. Refer to the types of ions present and their charges.

    [3 marks]
    (c)

    Both substances conduct electricity when molten but not when solid. State and explain why.

    [2 marks]
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  4. Question 24

    8 marks · Hard

    Sodium chloride and magnesium oxide are both ionic compounds with giant ionic lattice structures.

    (a)

    Describe, in terms of ions, the arrangement and structure of sodium chloride.

    [4 marks]
    (b)

    Magnesium oxide, like sodium chloride, forms a giant ionic lattice, but in magnesium oxide every magnesium ion is Mg^{2+} and every oxide ion is O^{2-}. Magnesium oxide has a higher melting point than sodium chloride. Using your answer to part (a), explain why magnesium oxide has a higher melting point than sodium chloride.

    [4 marks]
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