This student-created movie explains properties and changes of matter. (
http://education.apple.com/education/ilife/project_template.php?project_id=90&subject_id=4
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After reading the mini-tutorial on states of matter, you can take a quiz to check your understanding. (
http://www.school-for-champions.com/science/matterstates.htm
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Click on water, copper, or nitrogen. Then click on the thermometer to see how the particles of these substances behave at different temperatures. (
http://www.miamisci.org/af/sln/phases/
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This online density lab lets you calculate the density of an object by measuring its mass and volume. You can then test whether the object floats in a liquid with a density of your choosing. Note that this site allows you to access only one applet per day unless you register. (
http://www.explorelearning.com/index.cfm?method=cResource.dspDetail&ResourceID=17
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This text content of this site is quite advanced. Just watch the animation and observe the effects of buoyancy. (
http://web.umr.edu/~gbert/Amaster.HTML
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If you want to read about the fundamental nature of matter, which gives rise to all physical properties, just follow the arrows in this interactive tour. (
http://particleadventure.org/particleadventure/
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To learn more about the book this website supports, please visit its Information Center.