Diffusion

3.1

What the syllabus asks of you

Describe diffusion as the net movement of particles from a region of their higher concentration to a region of their lower concentration (i.e. down a concentration gradient), as a result of their random movement
State that the energy for diffusion comes from the kinetic energy of random movement of molecules and ions
State that some substances move into and out of cells by diffusion through the cell membrane
Describe the importance of diffusion of gases and solutes in living organisms
Investigate the factors that influence diffusion, limited to: surface area, temperature, concentration gradient and distance

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Chapter 3: Diffusion and osmosis

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