Relative Formula Mass (Mr) - AQA GCSE Chemistry Calculation Practice Book

Relative formula mass is the gateway to every quantitative chemistry calculation, but students rush through it and make avoidable errors. This AQA GCSE Chemistry workbook builds accuracy 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 Relative Formula Mass (Mr = sum of Ar values)

- 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)

Relative formula mass calculations require students to use the periodic table to find the Ar of each element, multiply by the number of atoms, and sum the total. Questions progress from simple compounds like NaCl to more complex formulae with brackets like Ca(OH)2 and hydrated salts.

Common student mistakes this workbook addresses: forgetting to multiply by the subscript number, not distributing the bracket correctly (e.g. in Mg(OH)2), using atomic number instead of mass number from the periodic table, and mixing up Ar and Mr.

Suitable for AQA GCSE Combined Science and Chemistry (Triple). Works for both foundation and higher tier students.

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