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Great resource if you have students needing makeup or home-bound. Virtual Chemistry Experiments are a collection of interative web-based chemistry tutorials. The tutorials employ Physlets and Chemistry Applets to simulate experiments or depict molecular and atomic structure. The guiding concept is to involve the read in making observations and acquiring data, and then using this information to draw conclusions and infer chemical principles.

I find these are best as additional to traditional lab experiences or, as I posted earlier, I use these for the students that can't be at school for usual labs. Understanding limitations of their own lab technique and evaluation of errors does not occur with simulations. Similar to difference between multiple choice assessment and free response.

I agree with Anna, virtual experiments wouldn't be my first choice in methodology for lab experiments, but there are somethings that you just, can't do in the classroom. Whether it is from limited resources, limited class time, or simply the experiment is too dangerous for the classroom, virtual experiments are a good alternative. I had a chemistry professor in my undergrad who was making a dvd textbook with lectures and experiments and there was a lot of cool experiments on the dvd that he would have never been able to do during his lectures.

Starting from atoms, see how many molecules you can build. Collect your molecules and see them in 3D!

Explore molecule shapes by building molecules in 3D! How does molecule shape change with different numbers of bonds and electron pairs? Find out by adding single, double or triple bonds and lone pairs to the central atom. Then, compare the VSEPR model to real molecules!