Atom Economy Calculations - AQA GCSE Chemistry Calculation Practice Book

Atom economy questions combine Mr calculations with percentage calculations, and students often lose marks at both stages. This AQA GCSE Chemistry workbook builds fluency with 12 scaffolded questions using the EVERY method framework.

The EVERY method breaks each calculation into clear steps: Equation, Values, Enter values into the equation, Rearrange if needed, Your units. Every question has a structured EVERY table for students to complete, building a consistent problem-solving habit. Questions get progressively harder: Q1-3 are straightforward, Q4-6 introduce unit conversions, and Q7-12 require rearranging the formula.

What's inside:

- 12 progressive questions on Atom Economy (atom economy = Mr of desired product / total Mr of all products x 100)

- Structured EVERY method table on every question page

- Progressive difficulty: simple substitution, then unit conversions, then rearranging

- Self-assessment tracker with "What made me stuck?" reflection checklist

- Full worked answers for all 12 questions using the EVERY method steps

AQA specification reference: 5.3 Quantitative Chemistry (Combined Science and Triple Chemistry, higher tier)

Atom economy calculations require students to identify the desired product and waste products from a balanced equation, calculate the Mr of each, and express the desired product as a percentage of the total. This links to green chemistry and industrial processes.

Common student mistakes this workbook addresses: dividing by Mr of reactants instead of Mr of all products, including only one product when there are several, not balancing the equation before calculating Mr, and confusing atom economy with percentage yield.

Suitable for AQA GCSE Combined Science and Chemistry (Triple), higher tier. Also useful for higher-attaining foundation students approaching the grade 5 boundary.

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