Unit 2, Day 16

Agenda

1. Warm-up: two substances on the board — what will happen, and why
2. Unit 2 consolidation: given two substances, decide whether they react, predict the products, balance it, and say what you would see
3. Look ahead: next unit, we start counting things too small to count

Things to do before our next class

• Bring an estimate: how many atoms in a paperclip? Any method.