This week was all about one of the most important substances for life on earth--water! We reviewed what an atom is and the polarity of the parts of an atom. Then, it was time to see what those negative electrons do in water molecules.
The students worked in groups and rotated between 6 different stations where they explored the shape of a water molecule and the properties of water that cause it to act in some surprising ways. They saw cohesion, the attraction of water molecules to one another, and adhesion, the attraction of water molecules to molecules of other substances, working while floating paper clips on the surface of a cup of water, counting how many drops of water they could fit on a penny, and tested how quickly water could defy gravity and travel up a strip of paper towel. They demonstrated that water in a solid state is denser than liquid water, and that water evaporates much more slowly than alcohol. They came home with a short assignment on how some of these experiments we did in class apply to water in the real world. I hope they have a few minutes this week to follow up and think about water in their life. Books: A Drop of Water--Beautiful pictures Videos: Properties of Water by Amoeba Sisters (We watched this in class.) What If You Stopped Drinking Water (for the kids who wondered why we were doing water experiments in Biology Class--just a quick look at one aspect of water's importance for life) Activities: Water Rotation Lab-- We did most of these experiments, but some would be fun to let the kids experiment with again, especially the demonstration of surface tension with the paper clips. Brainstorm all the ways you see water at work in the real world. What properties of water are at work?
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May 2020
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