Middle School

Why are cells so small? Why aren't cells larger? Wouldn't it be more efficient to have larger cells? When your students cut open their stained agar cells and see the diffusion pattern for themselves, the answers will be obvious.Student measurements a...

Students will love this functioning diffusion model. The semipermeable membrane in the center of the model allows the passage of “small” molecules while keeping the “large” molecules trapped on one side of the membrane. Random...

No more confusion about diffusion and equilibrium! In this interactive class demonstration, students discover that diffusion is due to molecules moving randomly about and that the “final” state of equilibrium is really a dynamic condition. Transferri...

Introduce the basic concepts of osmosis and diffusion with this involving laboratory activity. Using a colloidal solution of starch and sodium chloride students will:• Clearly observe the process of dialysis• Observe diffusion through a semipermeable...

Students will gain experience and understanding using semi-permeable membranes to simulate the absorption of nutrient molecules into cells. Experiments are carried out using starch and glucose to further demonstrate why some of the foods we eat must ...

Bring passive cell transport to life in this student laboratory kit. Students create an artificial cell using dialysis tubing and simulated cellular fluid containing a special dye and glucose. The diffusion of dye through the membrane can be directly...