Today we did the Avogadro lab. Most were able to get a bunch of trials and do initial calculations.
HW: fill in lab report except for conclusion. We’ll do that in class tomorrow. Make sure you’ve reviewed the videos on empirical and molecular formulas for class on Wed.
Today we worked on Avogadro lab & conclusion writing. I handed out the pink sheet to give you a sense of the structure of a conclusion. I also emphasized the need to justify your claims – to not just say that a particular error skewed the data, but to think about whether it increase or decreased the final result and by how much. This requires additional calculation to show the significance of the error. Also consider assumptions that might be false!
Today we reviewed empirical and molecular formulas. Making sure to justify each step using atomic and molecular theory. We spent the last half an hour or so working textbook problems.
HW: work on avogadro lab
No class b/c early release
The first half of class we worked on the packet – started with page 12 mole problems. Emphasized using dimensional analysis as well as percent composition to solve. Then you did some naming practice and I showed you a mnemonic for memorizing the -ate ions. The second half of class we reviewed for your test on Tuesday. I will be expecting you to justify molecular and empirical formulas at the molecular level. See the notes here and here. The last half hour I introduced the lab we will do on Monday and then had you work on the challenge problems that are in the packet under the objective chart.
HW: Review for test on Tuesday! Finish Avogadro Lab! Read Lab! Make sure to dress in long pants, sleeved shirt, close-toed shoes on Monday. You may want old clothes. Sulfuric acid will put holes in them!
Today we started with a warm-up on the difference between chemical and physical properties. This helped us review molecular level drawing ideas. Then we did a bunch of lecture on why we think there are atoms/evidence for atoms. If you missed the lecture (check out these notes from class or these typed notes.) and then answer the google classroom essay. Most of B block was working on the essay.
Notes on refinement on the atomic model. Here’s the notes.
HW: Watch mass spec video 1.a.3.2, finish that mass spec page in the packet that we were working on in class. Continue with textbook problems.
Finish up mass spec & Review for test. Here’s the notes w/ answers for mass spec q’s.
Review of dimensional analysis ideas + a couple mole problems as a refresher. Then we did CA 2 to see how the mole was derived. You should be able to give 2 meanings of mass on the periodic table now and explain WHY we use 6.022e23. The rest of class we worked on the Avogadro pre-lab. Might need to update pre-lab questions next year b/c they don’t lead kids to a conclusion.
HW: Review Moles Video 1.b.2.2 & Naming Review Video 1.b.1.1
Welcome AP Chem Students!
This year I will be posting actual blog posts that will update you on what we’ve done in class and provide links to assignments and other documents.
Just like last year, though, the unit tabs at the top will have the most complete information for a particular unit: links to answers, notes, documents and videos!
As we complete each day, I will update with what we actually did.
- Today we handed out books, set up your lab portfolio in google sites, answered questions about the density lab, went over some tips for studying/ the unit outline and objectives, then did some concept mapping, but were interrupted by a fire drill.
- HW: read/do homework problems from chapter 2, finish density lab.
- start with molecular level drawing, then do the molecular representations lab (posted in google classroom).
How Do We Know Atoms Exist from Maggie Wiseman on Vimeo.
Monday: End of year plan presented: you will design 2 labs and do 2 scripted labs. The first lab is to design an experiment to investigate factors that affect electrochemical cells. Link to materials
Monday: Mock Exam! Free Response
Tuesday: Grade mock exams
Wednesday: Acid/Base Review Here’s the notes.
Thursday: Ksp Review
Friday: Kinetics Review
Links to docs we talked about:
Monday: No school, teacher work day, end of quarter
Tuesday: Review of electrochemical cells
Wednesday: Delta G, Equilibrium and Ecell for the first half. Then the 2nd half: electrolysis.
Thursday: Exam review
Friday: Mock exam day – Multiple choice
Monday: Took thermo test
Tuesday: Notes on redox and balancing redox reactions.
HW: do practice balancing in packet and in textbook + watch this movie:
Monday: Today we did some review of heat problems (page 17 in packet 1) and then did the heat of fusion of water lab (pg 9). Write-up is to do calculations and analysis questions on worksheet, but also to explain the theory behind the calculations (explain what is going on in the lab/how we are determining the heat of fusion/why this works):
- Molecular Level: properties – use terms kinetic energy, potential energy and intermolecular forces
- Rxns: Thermo: why does this method work? What are the equations and what do the variables mean?
- Chemistry Math
Lab due Thursday.
For the second half of class we discussed entropy using these powerpoint notes through slide 20.
Tuesday: Today we started with a warm-up to review heat of formation calculations and entropy ideas. We also showed how you can use the same formula for entropy as you used with heats of formation to find change in entropy for a reaction. Then I went over power point notes to introduce delta G – Gibbs Free energy.
HW: Textbook problems!
Wednesday: Today we started with some warm-up questions to review entropy, delta G and work. That took all of A block. During B block I lectured on the relationship between delta G and equilibrium. Here’s the notes and warm-up. The last 10 min of class we worked on page 8 in packet 2.
Thursday and Friday: Thursday we went over solubility, including the idea that water can become more ordered when an ionic compound is dissolved in it. Rest of class and Friday’s class we worked practice problems.
Answers to MC on page 22 of packet 1) D 2)D 3)D 4)D 5)D 6)C 6)C
Monday: Review for properties test – I went over some basics, we did the chart in google drive and then we worked on packet problems.
Wednesday: Today we took notes on energy and calorimetry. Second half of class you did a calorimetry lab in which you designed methods to determine the heat of dilution for 18 M sulfuric acid and a reaction between acetic acid and sodium bicarbonate. I think it was really good to make you write out the calculations and decide on data before getting started because you worked out some of the trickier parts of calorimetry – like using the total mass in the Q = mCdT equation.
Homework: Lab calculations.
Thursday: Today we went over 3 ways of calculating heats of reaction using given data (given in tables in the textbook or on a worksheet). Here’s the notes. The three methods: Bond enthalpies, Hess’s Law and Heats of Formation.
Homework: Calorimetry calcs: 6.67, 6.69, 6.97, 6.101, 6.59, 6.61, Hess’s law: 6.71, 6.73, Heat of formation: 6.77 and 6.79, Bond Enthalpy: 9.85, 9.107, 9.109
Friday: We started with a lecture on internal energy and work, then did exercise 1-3 in packet 1 starting on page 10. Notes.
Homework: 18.31, 18.33
Monday: Today we went over the PE diagram for covalent bonds and tried to predict the diagram for N2, H2 and O2. Then we talked about acid strength, including for transition metals. We finished the 2nd part of organic modeling lab. Today’s notes.
HW: work on textbook problems.
Tuesday: Review. It was sunny! We went outside and worked on multiple choice test. In hindsight I wish I’d had them work on acid strength and polarity in particular!
Wednesday: Test on covalent bonding
Thursday: no class b/c short/early release.
Friday: We started with a review of electronegativity and polarity because this essential as we go into the intermolecular forces unit! Once we were all comfortable using EN and molecular shape to determine the polarity of a molecule and determine which of two molecules would be more polar we started the IMF pogil (packet 1). You all worked through page 7. Then I gave these notes and we did page 10 as a class.
Answers to packet 1