After the cell test, the kids completed two labs: Osmosis and Diffusion. Here and here are the lab links for the diffusion lab. Here are the lab instructions for the Gummy Bear Osmosis lab. I used recycled yogurt containers instead of glass beakers. The kids used three different colored gummy bears for three trials in each yogurt container. The kids added vinegar or sugar or salt to most of the samples. Two groups used plain water.
For the diffusion lab, use cheap baggies and knot them closed. The cheap baggies work as well as dialysis tubing, which is traditionally used for this diffusion lab. We used recycled yogurt container instead of beakers for this lab, too. Because the yogurt containers are so large, (32oz) the kids added 60 drops of iodine instead of ten. If you follow the directions in the lab and use smaller beakers or plastic cups, you won’t need more than 10 drops.
The kids worked in cell concept maps, too. Take a look.
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