This activity helps to simplify the concepts of diffusion though a membrane. Students will read concepts about molecules and then pull information from a text in which they can then apply in a lab setting when creating dialysis tubing model cells.
Molecules are constantly moving. They move in straight lines until they bump into other molecules and bounce off. This causes them to spread out and move away from each other until they are as far apart as they can be. DIFFUSION is the process by which molecules move from areas of HIGH concentration to areas of LOW concentration, until they are equally distributed. As time goes on the molecules continue to move, but maintain an equal distribution across the membrane.