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CIE · IGCSE · Chemistry

Stoichiometry and the Mole
Practice Questions

20 CIE IGCSE Chemistry questions on Stoichiometry and the Mole, each with instant feedback and a full examiner-style mark scheme.

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✨ Revision guide includes key terms, worked examples and exam technique for Stoichiometry and the Mole.

Try 2 sample questions on Stoichiometry and the Mole

Question 1 · 1 mark · Difficulty 1/3

What is the relative formula mass (Mr) of calcium carbonate, CaCO₃? [Ar: Ca = 40, C = 12, O = 16]

  1. 68
  2. 72
  3. 100
  4. 112
Show answer & explanation
✓ Answer: C100
Award 1 mark for correct calculation. Mr = 40 + 12 + (3 × 16) = 100. A is incorrect because it omits one oxygen atom (40 + 12 + 16 = 68). B is incorrect due to arithmetic error. D is incorrect because it counts oxygen atoms incorrectly as 4 instead of 3.
Question 2 · 1 mark · Difficulty 2/3

A student in Singapore heated 2.4 g of magnesium in air to form magnesium oxide. What mass of magnesium oxide was produced? [Ar: Mg = 24, O = 16] 2Mg + O₂ → 2MgO

  1. 2.4 g
  2. 4.0 g
  3. 4.8 g
  4. 8.0 g
Show answer & explanation
✓ Answer: B4.0 g
0 g. Award 1 mark for correct calculation. Moles of Mg = 2.4/24 = 0.1 mol. From equation, 2 moles Mg produces 2 moles MgO, so 0.1 moles Mg produces 0.1 moles MgO. Mr of MgO = 24 + 16 = 40. Mass of MgO = 0.1 × 40 = 4.0 g. A is incorrect because it assumes no mass gain from oxygen. C is incorrect because it doubles the magnesium mass instead of adding oxygen mass. D is incorrect due to calculation error.
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CIE IGCSE Chemistry: Stoichiometry and the Mole FAQ

How many CIE IGCSE Chemistry questions on Stoichiometry and the Mole are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Stoichiometry and the Mole for CIE IGCSE Chemistry, with new questions added every week. Each question gives you instant feedback and a full examiner-style mark scheme that tells you exactly what would earn marks on a real CIE paper. The questions span the full difficulty range — from straightforward recall (level 1) right up to multi-step reasoning and evaluation (level 3) — so the bank works for first-pass revision and final exam-week stress testing alike.
Is Kramizo free for CIE IGCSE students preparing for Chemistry?
Yes — completely free. Every student gets 45 questions a day on the free plan, with no card required and no trial countdown. That free quota works across every subject and every topic in our bank, so you can mix Stoichiometry and the Mole practice with other Chemistry topics or even switch to a totally different CIE subject without paying anything. Kramizo's optional Pro plan removes the daily cap and adds detailed progress analytics, but the free tier is the real product — used by thousands of GCSE, IGCSE and CSEC students.
Are the Stoichiometry and the Mole questions aligned to the official CIE IGCSE Chemistry syllabus?
Every question is written against the published CIE IGCSE Chemistry specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real CIE paper. Explanations are written in the style of official examiner mark schemes — they tell you what is being awarded marks and why distractors are wrong, not just whether you got it right. The bank is continually refined to match the latest syllabus updates from CIE.
How is Stoichiometry and the Mole typically tested on CIE IGCSE Chemistry papers?
Stoichiometry and the Mole appears across multiple question types on real CIE IGCSE Chemistry papers — most commonly as multiple-choice questions in the objective section, structured short-answer questions in the main paper, and occasionally as part of an extended response. Kramizo's practice bank reflects that mix: 4-option MCQs, true/false statements, fill-in-the-blank key terms, multi-select questions, and ordering questions. Working through the bank gives you exposure to every question style examiners actually use.

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