**AP Physics: Resistivity**

This year, I skipped over resistivity, so my students who took the AP Physics 1 exam last week had some trouble with free-response problem 2. Today, we took some time to look at the problem and discuss strategies for solving without any knowledge of resistivity. The students who took the test last week were very willing to share how they approached the problem, which was better than anything I could have said.

**Physics: Ray Diagrams**

Students worked through a worksheet on ray diagrams for pinholes. Students worked pretty quickly and confidently, so we had time to whiteboard answers for a gallery walk. There were some great conversations where students brought up their observations from the lab the past few days to decide whether their ray diagrams made sense.

**Chemistry Essentials: More Activity Series**

Students worked on some additional problems identifying probably reactions using an activity series. I also had students predict the products of the reactions; since we haven’t done formula writing in a while, a lot of students needed a refresher. Once they got started, however, the problems quickly became pretty easy for students.

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