Apologia’s Physical Science textbook has ‘The Winder of Water’ in Module 4. By all means, do the experiments in the textbook. However, add a few fun labs. I call this unit, ‘Why is water wet?’ Start with Steve Spangler’s Mysterious Water Suspension, which explores surface tension and cohesion. Drops on a Penny examines hydrogen bonds and surface tension. This activity is similar to adding drops of water to waxed paper. Try both. You can Bend Water to demonstrate hydrogen bonds, too. Do this lab on a cold dry day. I rub (charge with static electricity) a glass stirring rod with rabbit’s fur. Lastly, here are several labs about properties of water to try. I like to group a bunch of labs to try before I teach the content. Adhesion, cohesion, and surface tension make more sense after the kids see a few examples.
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