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

Formulae for ionic compounds

18 practice questions

Start practising (8 questions)

Practice questions

1–8 of 8 · Normal

  1. Question 1

    2 marks · Normal

    State the formulae for the following ionic compounds:

    (a)

    potassium sulfide

    [1 mark]
    (b)

    aluminium nitrate

    [1 mark]
    Answer and see the solution →

  2. Question 2

    4 marks · Normal

    The following ions are present in a solution: Ca2+, OH–, Fe3+, Cl–.

    (a)

    Name the ionic compound formed when Ca2+ reacts with OH–.

    [1 mark]
    (b)

    Write the formula of the compound formed between Ca2+ and OH–.

    [1 mark]
    (c)

    Write the formula for the compound formed when Fe3+ reacts with Cl–.

    [1 mark]
    (d)

    State why brackets are used in the formula for the compound formed between Ca2+ and OH–.

    [1 mark]
    Answer and see the solution →

  3. Question 3

    3 marks · Normal

    Calculate the formula for the ionic compound formed between magnesium ions (Mg2+) and phosphate ions (PO4^3–). Show your working.

    Answer and see the solution →

  4. Question 4

    3 marks · Normal

    Explain how you work out the formula for iron(II) sulfate, using the charges on the ions and their names.

    Answer and see the solution →

  5. Question 5

    4 marks · Normal

    The table shows the ions present in four different ionic compounds. Complete the formula for each compound in the table below:

    Compound nameIonsFormula
    sodium sulfideNa+, S2–
    zinc nitrateZn2+, NO3–
    aluminium sulfateAl3+, SO4^2–
    ammonium phosphateNH4+, PO4^3–
    Answer and see the solution →

  6. Question 6

    1 mark · Normal

    What is the formula for copper(II) nitrate?

    1. A.Cu(NO3)2
    2. B.Cu2NO3
    3. C.CuNO3
    4. D.(CuNO3)2
    Answer and check →

  7. Question 7

    2 marks · Normal

    Write the formula for these ionic compounds:

    (a)

    sodium phosphate

    [1 mark]
    (b)

    calcium carbonate

    [1 mark]
    Answer and see the solution →

  8. Question 8

    4 marks · Normal

    For each of the following, state the ions present, their charges, and the correct formula for the compound:

    (a)

    potassium nitrate

    (i)

    State the ions and their charges.

    [1 mark]
    (ii)

    Write the formula for potassium nitrate.

    [1 mark]
    (b)

    magnesium chloride

    (i)

    State the ions and their charges.

    [1 mark]
    (ii)

    Write the formula for magnesium chloride.

    [1 mark]
    Answer and see the solution →