Chemical potential is a difficult topic. Make sure you discuss the difference between pressure forcing a movement of particles and chemical potential doing so. The battery example worked well in class, the other two are for wednesday.
Asking what is chemical potential gives responses related to energy (bonds, etc). Using a diffusion example than shows that entropy of mixing based processes are also important. In asking about the prediction of osmosis three answers were received, left up, down, same. I tried to have students work through this, but the problem is too hard for it. Why is the chemical potential of water the only relevant quantity? Why can we expand it? I like the idea of using osmosis as an example, but it needs much more guidance.