Percentage Change in Osmosis - AQA GCSE Biology Practice Book

Percentage change is the calculation students get wrong most often in the osmosis required practical. This AQA GCSE Biology workbook builds confidence 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 Percentage Change in Mass (% change = change / original 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: 4.1 Cell Biology (Combined Science and Triple Biology)

Percentage change calculations appear in the osmosis required practical, where students measure how potato cylinder mass changes in different concentrations of sucrose solution. They must calculate the change, divide by the original mass, and multiply by 100, handling both positive and negative values.

Common student mistakes this workbook addresses: dividing by the final mass instead of the original mass, forgetting to multiply by 100, dropping the negative sign when mass decreases, and confusing mass with length measurements.

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

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