1.3 Diffusion and Osmosis Chapter 1

Diffusion The movement of particles from an area of high concentration to an area of low concentration The cell membrane is a selectively permeable membrane...it lets some things pass and not others (e.g. coffee filter) Diffusion occurs until there is equilibrium...an equal number of particles on both sides

osmosis the diffusion of water through a selectively permeable membrane (e.g. sponge) Osmosis occurs when water particles move from a higher concentration to a lower concentration

Examples of osmosis Equal movement of water in and out of cells

Examples of osmosis 2. More water moving into cell than is moving out

Example of osmosis 3. More water moving out of cells than moving in

Reverse osmosis - water goes from low to high e.g. desalinate water, purify syrup