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Searchable resources for chemistry! Really well done and easy to use.

What high school student wouldn't love an experiment that requires the chewing of bubble gum? This lesson plan has everything you need to determine the percentage of sugar in bubble gum. Students need an understanding of the periodic table and an ability to calculate molar mass.

"Wolfram|Alpha now supports Lewis structures-diagrams that show both the bonded and unbonded electrons in a molecule. But as any good teacher will tell you, even more important than finding the answer is the procedure used to get that answer. Thus, Wolfram|Alpha is expanding its Step-by-step interface into the realm of chemical bonding (with even more Step-by-step functionality coming soon)."

Free educational simulations covering a diverse topics designed by the University of Colorado available in various languages. This is a really great site to use for science resources. Teachers have also developed and posted lesson plans for each simulation.

Interactive Science Simulations Fun, interactive, research-based simulations of physical phenomena from the PhET project at the University of Colorado.

The Quest Learning and Assessment System uses an extensive knowledge bank of over 60,000 questions and answers covering Math, Biology, Chemistry, Computer Science, Physical Science and Physics.