Fick's Law of Diffusion - AQA GCSE Biology Calculation Practice Book

Fick's law is a Triple-only calculation that many students see for the first time in a mock exam. This AQA GCSE Triple Biology workbook builds confidence before that happens, 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 Fick's Law (rate of diffusion is proportional to surface area x concentration difference / thickness)

- 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 (Triple Biology only)

Fick's law describes how the rate of diffusion depends on surface area, concentration difference, and the thickness of the membrane. Students apply it to gas exchange in the lungs, absorption in the small intestine, and diffusion across cell membranes.

Common student mistakes this workbook addresses: multiplying thickness instead of dividing by it, confusing concentration difference with just one concentration value, not recognising that the result is proportional (not an exact rate), and forgetting to state appropriate units.

Suitable for AQA GCSE Biology (Triple only, not Combined Science). Works for both foundation and higher tier students.

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