Lesson 5.3.2.2

5.3.2.2 Amounts of substances in equations (HT only) Quiz: AQA Combined Science, Unit 10

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 5.3.2.2, Amounts of substances in equations (HT only): 20 multiple choice questions for the AQA GCSE Combined Science (8464), Unit 10: Quantitative chemistry, written with Revision Ninja.

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The 20 questions

  1. In the equation Mg + 2HCl -> MgCl2 + H2, what does the coefficient 2 before HCl represent?

    • Two moles
    • Two atoms
    • Two grams
    • Two molecules

  2. In a balanced symbol equation, what do the coefficients represent?

    • Mole ratio
    • Density ratio
    • Volume ratio
    • Mass ratio

  3. In 2Mg + O2 -> 2MgO, what mass of magnesium oxide forms from 6 g of magnesium? (Mg = 24, MgO = 40)

    • 10 g
    • 12 g
    • 20 g
    • 6 g

  4. In Mg + 2HCl -> MgCl2 + H2, what mass of magnesium chloride forms from 12 g of magnesium? (Mg = 24, MgCl2 = 95)

    • 95 g
    • 12 g
    • 24 g
    • 47.5 g

  5. In Mg + 2HCl -> MgCl2 + H2, what mass of hydrochloric acid (Mr 36.5) reacts with 12 g of magnesium?

    • 12 g
    • 36.5 g
    • 73 g
    • 18.25 g

  6. In CaCO3 -> CaO + CO2, what mass of calcium oxide (Mr 56) forms from 25 g of calcium carbonate?

    • 11 g
    • 25 g
    • 28 g
    • 14 g

  7. In CaCO3 -> CaO + CO2, what mass of carbon dioxide (Mr 44) forms from 25 g of calcium carbonate?

    • 14 g
    • 11 g
    • 22 g
    • 25 g

  8. In 2H2 + O2 -> 2H2O, what mass of water forms from 4 g of hydrogen? (H = 1, H2O = 18)

    • 72 g
    • 18 g
    • 36 g
    • 4 g

  9. In Fe2O3 + 3CO -> 2Fe + 3CO2, what mass of iron forms from 16 g of iron(III) oxide? (Fe2O3 = 160, Fe = 56)

    • 22.4 g
    • 11.2 g
    • 16 g
    • 5.6 g

  10. In Fe2O3 + 3CO -> 2Fe + 3CO2, how many moles of CO2 form from 0.1 mol of Fe2O3?

    • 0.2 mol
    • 0.1 mol
    • 0.6 mol
    • 0.3 mol

  11. In N2 + 3H2 -> 2NH3, what mass of ammonia (Mr 17) forms from 28 g of nitrogen?

    • 34 g
    • 17 g
    • 56 g
    • 28 g

  12. In N2 + 3H2 -> 2NH3, what mass of hydrogen is needed to react completely with 28 g of nitrogen?

    • 3 g
    • 2 g
    • 6 g
    • 12 g

  13. In Zn + H2SO4 -> ZnSO4 + H2, what mass of hydrogen forms from 6.5 g of zinc? (Zn = 65)

    • 2 g
    • 0.2 g
    • 0.1 g
    • 6.5 g

  14. In 2Na + 2H2O -> 2NaOH + H2, what mass of sodium hydroxide (Mr 40) forms from 4.6 g of sodium? (Na = 23)

    • 8.0 g
    • 16 g
    • 2.3 g
    • 4.6 g

  15. In C + O2 -> CO2, what mass of carbon dioxide forms from 3 g of carbon, with excess oxygen? (C = 12, CO2 = 44)

    • 33 g
    • 11 g
    • 3 g
    • 22 g

  16. In MgCO3 -> MgO + CO2, what mass of magnesium oxide forms from 42 g of magnesium carbonate? (MgCO3 = 84, MgO = 40)

    • 40 g
    • 42 g
    • 20 g
    • 21 g

  17. In 2Cu + O2 -> 2CuO, what mass of copper(II) oxide forms from 12.8 g of copper? (Cu = 64, CuO = 80)

    • 16 g
    • 8 g
    • 12.8 g
    • 32 g

  18. In NaOH + HCl -> NaCl + H2O, what mass of sodium chloride (Mr 58.5) forms from 0.3 mol of sodium hydroxide?

    • 12.0 g
    • 40.0 g
    • 17.55 g
    • 9.0 g

  19. In Mg + 2HCl -> MgCl2 + H2, what mass of magnesium chloride forms from 0.2 mol of magnesium?

    • 19 g
    • 9.5 g
    • 4.8 g
    • 38 g

  20. In 2Mg + O2 -> 2MgO, 4.8 g of magnesium (0.2 mol) reacts with 3.2 g of oxygen (0.1 mol). How many moles of MgO form?

    • 0.1 mol
    • 0.2 mol
    • 0.4 mol
    • 0.3 mol

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