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8.1 Exchange surfaces and diffusion

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Question 21
F

A model uses the following expression.

relative diffusion value=surface area×concentration differencemembrane thickness \text{relative diffusion value}=\frac{\text{surface area}\times\text{concentration difference}}{\text{membrane thickness}} relative diffusion value=membrane thicknesssurface area×concentration difference​

The surface area is 8 units, the concentrations on the two sides are 9 and 3 units, and the membrane thickness is 2 units.

What is the relative diffusion value?

[1]
A

242424

B

121212

C

363636

D

484848

Markscheme

8.1 Exchange surfaces and diffusion Questions

  1. GCSE
  2. /Biology
  3. /8.1 Exchange surfaces and diffusion

42 exam-style questions on Edexcel GCSE Biology 8.1 Exchange surfaces and diffusion, covering 8.1.1 Introduction to exchange and transport, 8.1.2 Alveoli adapted for gas exchange, 8.1.3 Factors affecting rate of diffusion, and 8.1.4 Rate of diffusion using Fick's law. Each one has a worked solution and a mark scheme showing where the marks go.

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