Monday: Today we started with a review of drawing particle level pictures. I had volunteers come up to draw various pictures (aqueous sodium chloride, aqueous carbon dioxide, solid lithium oxide, gaseous CO2, and then liquid CO2) which let me see where you guys were getting confused. We also drew two reactions – HCl with Fe and AgNO3 with NaCl.
Next we did some atomic history review. I went over Law of Conservation of Mass, Def. Proportions and Multiple Proportions and then I had you answer a question on google classroom. “Why do we think there are atoms?”. This took a long time b/c you all needed to really process these ideas. It’s one thing to hear them and another to be able to use them as an argument for atoms.
For the last 20 minutes we talked about refinements to Dalton’s Atomic Model – Cathode Ray experiment, Rutherford and finally Mass Spec giving us evidence of isotopes. Notes are here.
Homework: continue with book problems. Test is Thursday.
Tuesday: Today we worked on mass spectrometry packet all class. Most go through #4 and we left 5+ to do on Wednesday.
Wednesday: The first half of the class we did a bit of review: finished mass spec packet and went over some ideas from the molecular representations lab that a couple groups got wrong – definition of pure substance and difference between physical and chemical change. The rest of class you had time to work on homework problems.
Thursday:Test on atomic and molecular theory, atomic structure basics and particle level understanding.
Homework: watch moles video 1.b.2.2 (if you need a refresher!), try problems in ch 3: 27,37, 39, 41, 45
Friday: Skipped DA review because you all were doing it in math and physics already. So we went straight into the derivation of the mole with Chemactivity 2. Next we did some mole practice w/ textbook problems. These were kind of different than the straightforward ones you had in first year chemistry. It’s important that you be able to explain your method. For the second half of class you all worked on the Avogadro pre-lab. Some groups tested out getting the mass of a drop to 3 significant figures.
Homework: formula videos.