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

Formulae for ionic compounds

18 practice questions

Start practising (18 questions)

Practice questions

11–18 of 18

  1. Question 11

    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 →

  2. Question 12

    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 →

  3. Question 13

    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 →

  4. Question 14

    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 →

  5. Question 15

    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 →

  6. Question 16

    2 marks · Hard

    Iron(III) oxide is an ionic compound formed from Fe3+ and O2– ions. State the correct formula for iron(III) oxide and explain why this is the correct formula.

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  7. Question 17

    5 marks · Hard

    Potassium ions (K+) and phosphate ions (PO4^3–) combine to form an ionic compound.

    (a)

    State the symbol and charge of the potassium ion and the phosphate ion.

    [2 marks]
    (b)

    Explain, with working, how to deduce the simplest formula for the ionic compound formed from these ions.

    [3 marks]
    Answer and see the solution →

  8. Question 18

    2 marks · Hard

    State the formula for the ionic compound formed between ammonium ions and nitrate ions. Explain your answer.

    Answer and see the solution →