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by "They Might be Giants" about the elements and the periodic table

Interactive PT for students and teachers alike

shows how the molecules of water interact with salt to dissolve it. use this with the periodic table lessons after talking about ions.

this site is from the Royal Society of Chemistry in London

January 2008 As part of the SMATHematics Project: The Wonder of Science, The Power of Mathematics-a collaborative partnership between Kennesaw State University and two local school districts, fifth graders had the opportunity to puzzle out chemical formulas of propane, methanol, and other important molecules. In addition, they explored properties that characterize certain molecules and then used their newly acquired knowledge of atoms' bonding requirements to help them build three-dimensional molecular models. The effort is succeeding-as you can see by the fifth-grade classroom experience described here.