On Monday, Nov 26th we reviewed a bit from the Reversible Reactions activity – including the definition of reversible reaction, dynamic equilibrium and examples that allow us to compare reactions that either “don’t happen”, “go to completion” or reach an equilibrium. This led us to the idea that we need a way of measuring the extent to which a reaction occurs….the equilibrium constant. The rest of the period you worked on ChemActivity 39.
Homework was to read as much of Ch. 14 as you had time to. It is becoming increasingly clear to me that you guys need to read…it really helps and will help you meet your goal of doing well on the AP Exam and getting college credit.
On Tuesday, Nov 27th I handed test back and we spent the short class working on test corrections. Too many mistakes were made on the kinetics test and it is important that you review this material since it is really a pretty important part of college chemistry (and the AP exam). Plus, understanding how reactions occur is essential to ALOT of other fields related to chemistry – environmental and biochemistry, for example! Understanding biochemical pathways, enzyme action, etc. what happens to pollutants in the environment are all studied from a kinetic standpoint!
Homework: Finish test corrections
Instructions for test corrections
- Find the correct answer and explain why it is correct (or at least why the choice you picked was not)
- Make up a sample question that test the same concept and answer it. This can be hard, but will make the biggest impact in helping you learn/remember the concepts!
- Rewrite explanations completely and correctly. You don’t need to make up new sample questions for this.
Wednesday, Nov 28: We started with Le Chatelier Exploration lab. The purpose of this was for you to see what happens when you have a system at equilibrium and you cause changes to it. It is hard, sometimes, to visualize what we are talking about when all we are dealing with is symbols and numbers…we followed that up with this animation. You made predictions and then saw what happened to the color of the solution as concentration of a reactant or product was changed.
Next we did a little review of equilibrium constant which you can check out in this PDF. It also has the homework assignment and answers to the first few pages of ChemActivity 40 on the reaction quotient (a quantitative way of measuring shifts from equilibrium).
Homework: Ch 14 (19,21,23,24,29, 37, 39, 41, 55, 57, 65)
Friday, November, 29th: Today we started with a warm-up doing some of probllems listed in the homework below (#6,7, 61). I lectured on Le Chatelier’s principle and we did some practice (le chatelier’s ship and this worksheet from Sandra Piepho). The rest of the block you worked on hoemowrk problems.
Homework: Ch. 14 (6, 7, 9, 10, 11, 12, 25, 26, 27, 61, 63, 69, 71, 73, 75, 77, 81, 93, 97)
Friday, November 30: Today we did a quick warmup which you can see on this PDF, just to review partial pressure. Then I introduced the idea of Kp (very similar to Kc, but using Partial pressures instead of concentrations). Here’s the notes (thanks to Mike Biggs for the powerpoint and the practice test, etc!). The rest of the block you worked on practice problems and homework. Here’s the calendar for this unit. If you were absent, please come get a copy of the practice test – don’t want to post online.
Homework: problems Ch 14 (51, 53, 85, 99, 101, 105)