Atom Economy — GCSE Chemistry Revision
Revise Atom Economy for GCSE Chemistry. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to Gas VolumesWhat is Atom Economy?
Atom economy is a measure of how efficiently a chemical reaction converts the atoms in the reactants into the desired product. A higher atom economy means less waste is produced. It is a key concept in 'green chemistry', which aims to make industrial processes more sustainable.
Board notes: Atom economy is a higher-tier concept for all exam boards. It is often linked to discussions about the sustainability of industrial processes. You should be able to calculate it and compare the efficiency of different reaction pathways.
Step-by-step explanationWorked example
For the reaction C + 2H₂O → CO₂ + 2H₂, what is the atom economy for producing hydrogen? Mr(H₂) = 2, Mr(C) = 12, Mr(H₂O) = 18. Mass of desired product = 2 x Mr(H₂) = 4. Total mass of reactants = 12 + (2 x 18) = 48. Atom Economy = (4 / 48) x 100 = 8.3%.
Mini lesson for Atom Economy
1. Understand the core idea
Atom economy is a measure of how efficiently a chemical reaction converts the atoms in the reactants into the desired product. A higher atom economy means less waste is produced.
Can you explain Atom Economy without copying the notes?
2. Turn it into marks
For the reaction C + 2H₂O → CO₂ + 2H₂, what is the atom economy for producing hydrogen? Mr(H₂) = 2, Mr(C) = 12, Mr(H₂O) = 18.
Underline the method, evidence, or command-word move that would earn credit in GCSE Quantitative Chemistry.
3. Fix the likely mark leak
Watch for this mistake: Confusing atom economy with percentage yield. Percentage yield is about how much product you actually get, while atom economy is about how much of the reactants theoretically end up in the desired product.
Write one correction rule before doing another practice question.
Practise this topic
Jump into adaptive, exam-style questions for Atom Economy. Free to start; sign in to save progress.
Atom Economy practice questions
These are original StudyVector questions for revision practice. They are not official exam-board questions.
Question 1
In one GCSE sentence, explain what Atom Economy is testing.
Answer: Atom economy is a measure of how efficiently a chemical reaction converts the atoms in the reactants into the desired product. A higher atom economy means less waste is produced.
Mark focus: Precise definition and topic focus.
Question 2
A Atom Economy question uses an unfamiliar context. What should the answer do before adding detail?
Answer: It should name the process, variable, equation, particle model, or evidence being tested, then explain the result using precise scientific vocabulary.
Mark focus: Method selection and command-word control.
Question 3
A student makes this mistake: "Confusing atom economy with percentage yield. Percentage yield is about how much product you actually get, while atom economy is about how much of the reactants theoretically end up in the desired product." What should their next repair task be?
Answer: Do one Atom Economy question and review the mistake type.
Mark focus: Error correction and next-step practice.
Atom Economy flashcards
Core idea
What is the main idea in Atom Economy?
Atom economy is a measure of how efficiently a chemical reaction converts the atoms in the reactants into the desired product. A higher atom economy means less waste is produced.
Common mistake
What mistake should you avoid in Atom Economy?
Confusing atom economy with percentage yield. Percentage yield is about how much product you actually get, while atom economy is about how much of the reactants theoretically end up in the desired product.
Practice
What is one useful practice task for Atom Economy?
Answer one Atom Economy question and review the mistake type.
Exam board
How should you use board notes for Atom Economy?
Atom economy is a higher-tier concept for all exam boards. It is often linked to discussions about the sustainability of industrial processes.
Common mistakes
- 1Confusing atom economy with percentage yield. Percentage yield is about how much product you actually get, while atom economy is about how much of the reactants theoretically end up in the desired product.
- 2Forgetting to include the balancing numbers from the equation when calculating the total mass of reactants or the mass of the desired product.
- 3Calculating the economy for the wrong product in a multi-product reaction.
Atom Economy exam questions
Exam-style questions for Atom Economy with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Atom Economy
Core concept
Atom economy is a measure of how efficiently a chemical reaction converts the atoms in the reactants into the desired product. A higher atom economy means less waste is produced. It is a key concept i…
Frequently asked questions
Why is a high atom economy important?
A high atom economy means less waste is produced, which is better for the environment. It also means the process is more cost-effective as less is spent on raw materials that end up as waste.
Which type of reaction has 100% atom economy?
Addition reactions, where two or more reactants combine to form a single product, have an atom economy of 100% because all the atoms from the reactants are incorporated into the product.