Students played with PhET’s Bending Light simulation to start building some ideas about refraction. I tried to keep the questions very broad and focused on conceptual understandings. Students really took advantage of all the tools available and made a lot of very detailed observations that would have been tough or impossible in a more traditional lab.
Chemistry: Empirical Formula Lab
Students worked on a lab that terrifies me (I once had a careless student singe his eyebrows), but gives really nice results. Students started with a sample of copper II oxide, then burned off the oxygen to get pure copper. They then used their initial and final mass to determine how much oxygen was in the original sample and find an empirical formula.