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HomeAQA GCSE ChemistryQuantitative chemistry: percentage yield and atom economy
AQA · GCSE · Chemistry

Quantitative chemistry: percentage yield and atom economy
Practice Questions

20 AQA GCSE Chemistry questions on Quantitative chemistry: percentage yield and atom economy, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Quantitative chemistry: percentage yield and atom economy

Question 1 · 1 mark · Difficulty 1/3

What is the definition of percentage yield?

  1. A) (actual yield ÷ theoretical yield) × 100
  2. B) (theoretical yield ÷ actual yield) × 100
  3. C) (mass of reactants ÷ mass of products) × 100
  4. D) (atom economy ÷ actual yield) × 100
Show answer & explanation
✓ Answer: AA) (actual yield ÷ theoretical yield) × 100
Percentage yield compares the actual yield obtained in an experiment to the maximum theoretical yield possible, expressed as a percentage. Option B inverts the fraction, which is a common student error. Options C and D describe unrelated or invented quantities.
Question 2 · 1 mark · Difficulty 1/3

What does atom economy measure?

  1. A) The proportion of reactant atoms that end up in the desired product
  2. B) The number of atoms present in the reactants
  3. C) The percentage of product actually collected in an experiment
  4. D) The efficiency with which a catalyst speeds up a reaction
Show answer & explanation
✓ Answer: AA) The proportion of reactant atoms that end up in the desired product
Atom economy measures what proportion of the total mass of reactants becomes the desired product, based on the balanced equation. It is a theoretical measure of efficiency, not an experimental one. Options C and D describe percentage yield and catalysis respectively, which are common confusions.
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AQA GCSE Chemistry: Quantitative chemistry: percentage yield and atom economy FAQ

How many AQA GCSE Chemistry questions on Quantitative chemistry: percentage yield and atom economy are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Quantitative chemistry: percentage yield and atom economy for AQA GCSE 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 AQA 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 AQA GCSE 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 Quantitative chemistry: percentage yield and atom economy practice with other Chemistry topics or even switch to a totally different AQA 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 Quantitative chemistry: percentage yield and atom economy questions aligned to the official AQA GCSE Chemistry syllabus?
Every question is written against the published AQA GCSE Chemistry specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real AQA 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 AQA.
How is Quantitative chemistry: percentage yield and atom economy typically tested on AQA GCSE Chemistry papers?
Quantitative chemistry: percentage yield and atom economy appears across multiple question types on real AQA GCSE 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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