Quantitative chemistry GCSE questions
Cover the answers and try these Quantitative chemistry checks first. The full quiz in the app includes hints.
How to use these
Write your answer, then check. If you miss one, open the Quantitative chemistry lesson before you retry.
Practice questions
Cover the answers and have a go first. Worked solutions are underneath.
In a closed system, mass is conserved because
Heating CaCO₃ in an open crucible loses mass because
M_r of H₂SO₄ (H=1, S=32, O=16) is
% by mass of H in H₂O (H=1, O=16) is
Common mistakes
- Students write "mass is destroyed". It is not — it left as a gas, or a gas from the air was not counted.
- Al2(SO4)3 has 3 sulfate groups: 3 sulfur and 12 oxygen, not 4 oxygen.
- Use grams, not kilograms. Convert 250 mg to 0.250 g before you divide. 1 mole is 6.02 × 10^23 particles — do not treat that number as a mass.
- Using 250 instead of 0.250 gives an answer 1000 times too small. Convert the volume first. Do not mix g/dm^3 with mol/dm^3.
Answers and working
Frequently asked questions
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