The chemistry students learned about ionic compounds. Specifically, they learned how to name them (super easy) and how to determine their formulas (not super easy). For example, they should know that when a calcium ion and a choride ion combine it forms calcium choride and the formula is CaCl2.
The AP Biology students learned the details of cell respiration. Here's the key thing: they now know why we breathe oxygen. Tell everyone you see! Scream it from a mountain top! WE BREATHE OXYGEN SO ELECTRONS CAN BE DRAWN THROUGH THE ELECTRON TRANSPORT CHAIN TOWARD OXYGEN AND THE ELECTRONS LOSE THEIR ENERGY WHILE PUSHING PROTONS INTO THE INTERMEMBRANE SPACE SO THAT WHEN THE PROTONS MOVE BACK INTO THE MITOCHONDRIAL MATRIX, THE PROTONS INTERACT WITH ATP SYNTHASE TO MAKE ATP!!!!!! YES!