There are certain apps that make you go "wow" and I think Elements 4D from DAQRI is one of those apps. From the creators of Anatomy 4D, this app allows you to visualise base elements on the desk in front of you, and even merge those elements to see how they react.
The free app for iOS or Android uses your devices camera, and a set of purchasable wooden blocks to work it's Augmented magic. You can also print and create some of the element blocks for free to demo the app.
Even if elements and compounds don't form part of your delivery, this is an excellent example of how AR can be used in education.