Use a two liter, three pencils, vinegar, baking soda, a paper towel, and a cork to build this rocket. Pretty simple! This experiment easily goes along with Newton's Laws, scientific inquiry, or chemical reactions.
The emerging set of interactive simulations at PhET that now use HTML5 and work solely within a modern browser. These are heavy in the physical sciences... but also include acid-base, atomic structure, chemical equations, etc.