2.16 Describe simple experiments on diffusion and osmosis using living and non-living systems

DIFFUSION:

• Put a drop of food colouring into a glass of water
• Time how long it takes for the water to be all the same colour
• Make the independent variable temperature
• When the water is hotter, the particle will have more kinetic energy, therefore the dye will move through the water faster

OSMOSIS:

• Cut two pieces of potato the same size and write down their weights
• Put one in distilled water and the other in salt water
• After an hour weigh them again
• The one in distilled water would have gained weight because the water moves from an area of high density to an area of low density
• The one in the salt water will lose weight as the water in the potato will move to the more highly concentrated salt water