There are quite a few applets demonstrating chemical reactions/bonds or physical equations etc., and as such applets are relatively common in teaching materials

There are quite a few applets demonstrating chemical reactions/bonds or physical equations etc., and as such applets are relatively common in teaching materials for high school (/secondary education) physics and chemistry, at least with teachers (I had or) I have substituted. They are obviously years old and rarely signed, which is a shame because quite often there are plenty of demos, none of which I can run with modern default settings of a PC (and sometimes I wouldn't have enough credentials to do anything about it, anyway).