Osmosis & Diffusion


684260 Carolina BioKits: Diffusion-Osmosis Carolina BioKits® : Diffusion-Osmosis


For a class of 30. Students use dialysis tubing and solutions to study the movement of materials across a semipermeable membrane by diffusion and osmosis. Kit includes:


Needed but not included:


Dialysis Tubing, 15-m Roll (50 ft) Glucose Solution, 20% Glucose Solution, 80%


Iodine-Potassium Iodide Solution Starch Solution, 2% Glucose Test Strips


Red, White, and Blue Thread Plastic Dropping Pipets Cups


Rulers


Teacher’s Manual with Reproducible Student Guide


684260 Per kit


Cell Size and Diffusion Kit Grade 8–College. For a class of 32 students. Diffusion, which results from the random movement of molecules and other small particles, is essential to the life of a cell. Many nutrients enter a cell by diffusion, and the same process discharges waste products. Diffusion occurs rapidly over short distances but more slowly over longer distances. In this kit’s activities, students use agar cell models to observe the results of diffusion over a period of 10 minutes. Stu- dents then reinforce the results by using calculations to explore the relationship between diffusion rates and cell size and the importance of the ratio of a cell’s surface area to its volume.


684064 Kit Each 684065 Refill Each Customer Review


“I have used this kit for years. While the students may need help with the mathematical concepts involved, they read- ily understand the limiting relationship diffusion has on cell size.”


High School Chemistry Teacher 684064 Cell Size and Diffusion Kit


Distilled or Deionized Water (10 L) Container (4 L/1 gal) Containers for Water Beakers (250 mL)


Electronic Balances (accurate to 0.1 g) Scissors


Paper Towels


Additional Plastic Dropping Pipets (optional) Additional Small Beakers (optional)


Teacher’s Choice Carolina Exclusive 684258 Osmosis Poster Osmosis Poster


18 × 24". The graphics and photographs provide a basic definition of osmosis. Includes images of red blood cells and plant cells in hypotonic, isotonic, and hyper- tonic environments, with a simple explanation below each. Laminated.


684258 Each


44


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Physiology


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