• General Chemistry Online: Construction Kits
  Construction Kits let you assemble problem solutions, chemical formulas, chemical equations, and other chemical objects piece by piece or step by step. You'll need Macromedia's free Flash Player to use them. Flash Player comes pre-installed with most modern browsers, but if you're using an older browser you may need to download Flash Player here (version 6 or better is required).
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• Howstuffworks "How Batteries Work"
  Ba­tteries are all over the place -- in our cars, our PCs, laptops, portable MP3 players and cell phones. A battery is essentially a can full of chemicals that produce electrons. Chemical reactions that produce electrons are called electrochemical reactions. In this article, you'll learn all about batteries -- the basic concept at work, the actual chemistry going on inside a battery, rechargeable versions, what the future holds for batteries and possible power sources that could replace them.
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• Reactants, Products, Leftovers - PhET
  Reactants, Products and Leftovers Download Run Now! Version: 1.00 (change log) 1,372 kB Create your own sandwich and then see how many sandwiches you can make with different amounts of ingredients. Do the same with chemical reactions. See how many products you can make with different amounts of reactants. Play a game to test your understanding of reactants, products and leftovers. Can you get a perfect score on each level?
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