Chemistry Mobile

Chemistry Mobile is another cool (and free) Android app, this time useful in the science classroom. It allows you to do things like calculate molar masses, and balance chemical equations. There’s a built in periodic table inside and several other things that I’m not enough of a chemist to really understand.
It’s received positive reviews all around. There is no version to which you can upgrade since it seems that the developer of this app is willing to give you everything for free.