Housekeeping: We are now investigating spectroscopy. This is the last chapter for SL and HL content. Everything we do after this week will be related to your IA, the G4 project, or prep for mock exams in February. I won't cover Option C: Energy until after mock exams. You should have your graded IAs no later than next Monday. You guys got a lot of work to do.
I emailed you some practice questions for this section, but I don't plan to quiz you over it. Please download the questions.