Diffusion

1 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

2 State that the energy for diffusion comes from the kinetic energy of random movement of molecules and ions

3 State that some substances move into and out of cells by diffusion through the cell membrane

4 Describe the importance of diffusion of gases and solutes in living organisms

5 Investigate the factors that influence diffusion, limited to: surface area, temperature, concentration gradient and distance