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 Printable Version for your convenience!
Title - Osmosis/Diffusion
By - LeAnn Barnes
Primary Subject - Science
Grade Level - 6-8
The student will use a test tube containing a starch solution covered with cellophane to simulate a cell. The "cell" will be inverted into a beaker of water that contains iodine. When starch comes into contact with iodine, it turns a bluish-black color. This color change will allow the students to observe the movement of the water, which contains iodine, into the "cell". In addition, this simulation allows students to visualize how the cell membrane controls what moves in and out of the cell. For example, if the particles are too large, such as the starch molecules, they will not be allowed to enter or exit the cell.
The student will then be asked to record whether the water moved into or out of the cell. The position of the bluish-black color will allow the student to determine which way the movement occurred. Using the steps of the scientific method, I ask the students to write a lab report stating their hypothesis, using drawings to show the set-up, and writing out a conclusion. They enjoy this lab because they can actually "see" it work.
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