Conservation of Mass - AQA GCSE Chemistry Calculation Practice Book

Conservation of mass sounds simple but exam questions on gas loss and precipitate formation catch students out every year. This AQA GCSE Chemistry workbook builds understanding 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 Conservation of Mass (total mass of reactants = total mass of products)

- 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)

Conservation of mass calculations require students to use balanced equations and given masses to find unknown masses. Questions include straightforward addition, reactions where gas escapes (apparent mass loss), and precipitate formation where the system appears to gain mass.

Common student mistakes this workbook addresses: thinking mass is lost when a gas escapes (rather than understanding the gas still has mass), not using the balanced equation ratios, confusing conservation of mass with conservation of atoms, and forgetting to subtract to find the unknown.

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

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