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Selectively Permeable Membranes

Students learn that engineers develop different polymers to serve various functions and are introduced to selectively permeable membranes. In a warm-up activity, they construct models of selectively permeable membranes using common household materials, and are reminded about simple diffusion and passive transport. In the main activity, student pairs test and compare the selective permeability of everyday polymer materials engineered for food storage (including plastic grocery bags, zipper sandwich bags, and plastic wrap) with various in-solution molecules (iodine, corn starch, food coloring, marker dye), assess how the polymer’s permeability relates to its function/purpose, and compare that to the permeability of dialysis tubing (which simulates a cell membrane) View the full activity at TeachEngineering: https://www.teachengineering.org/acti... TeachEngineering has over 1,500 FREE lessons and activities. Visit http://www.TeachEngineering.org for more! Music: EDM_Detection_Mode- Kevin MacLeod