Week of 2/6

Monday:

Today we did the buffer capacity lab. I started with the question: What makes a good buffer? After brainstorming for a bit we went with testing 20mL of buffer by adding small amounts of 1 M HCl and 1 MNaOH (in separate trials) until the pH changed by two.  Instructions for lab write-up are on google classroom.  Smart board crashed so I do not have notes from today…

Tuesday:

Reviewed for test – gave you 6 review problems that took all class to solve. Then pointed out the multiple choice

 

What is on the test?

1) Definitions (Arrhenius and Bronsted-Lowery/ conjugate pairs)

2) Strong vs. Weak (memorize strong acids and bases, definitions of strong/weak, acid/base dissociation constants (Ka, Kb), molecular level pictures, rate of reaction)

3) pH calculations (strong vs weak, relationship with Kw and water ionization (dissociation), ice table, allowed assumption so you don’t have to use quadratic)

4) Salt hydrolysis (relative strength of conjugates, determine if solution will be acidic, neutral or basic, write hydrolysis reactions, identify spectator ions, calculate pH, Kw = Ka*Kb)

5) Buffers (weak a/b + conjugate in relatively significant proportion, can use henderson-hasselbach equation to solve for pH, recognize buffer solutions (including 1/2 titration method), explain how a buffer works, molecular level picture)

6) Titration (explain (relate to salt hydrolysis) and solve for equivalence point, how to get Ka from titration curve, what indicator to use given pKa, end point vs equivalence point, buffering region, molecular level pictures)

Sample questions from today’s review session.

Wednesday:

Acid/Base test

Thursday:

Today we started with the Atomic Emission lab from first year chem b/c we skipped it last year so many of you hadn’t learned anything about it!  You measured the wavelengths of all 5 atoms and we briefly talked about why the atoms were different. Here’s a video if you missed it.

Friday:

Work on Bohr Model lab.  Turn in by Tuesday morning.

Week of 1/30

Monday:

Today we started with a quick review of what a buffer is and how to identify one.

Tuesday:

Today we started with the titration simulation so that you could see that not all equivalence points will be at a pH of 7.  We talked about why that happens for weak acids and bases (its because of their conjugate that is present at the equivalence point).  We identified the buffering region and then you all spent the rest of class working in groups drawing molecular level pics of 4 parts along a titration curve on big paper.

Test on Acids/Bases: Monday

Wednesday:

Today we worked titration problems – how to find pH at equivalence point, buffer region, etc.

Thursday:

Today we did the indicator lab. HW was a google classroom assignment on the subject.

Friday:

No school, end of quarter grading day.

Week of 1/23

Monday:

Today we started with some warm-up questions, reviewing Ka problems.  Then we did the salt hydrolysis exploration lab in which each person tested two ionic compounds  to see if they made the pH change. Here are the results.

The rest of class we worked on understanding what happened in the lab and explaining it.  At this point you should be able to take an ionic compound (a salt), write the hydrolysis reactions for each ion and determine if it will form a neutral, acidic or basic solution. Here’s the notes.

Tuesday:

Today we reviewed a bit from yesterday, went over the term amphiprotic, the meaning of Ka1, Ka2, Ka3 for polyprotic acids.  The rest of class you spent working on ChemActivity 47 in the packet. Here’s the answers.

HW: finish chemactivity 47 (the exercises on last page) + textbook problems.

#Wednesday:

We started with a Buffer Demo to show you what a buffer does and then we watched an online simulation to see how it works at the molecular level.  Next we worked through the new packet’s outline of notes and made it to the page where you had to identify buffer systems and give an approximate pH.

#Thursday:

Continued with Buffer notes and problems.

Friday:

No class b/c I was at a textbook adoption meeting

Week of Jan 16

Monday:

MLK’s birthday. No school.

Tuesday:

Worked on page 12 in the packet – lots of questions, will review tomorrow.

HW: textbook problems

Wednesday:

Reviewed all of the acid/base concepts we have learned so far.  Learned 7 strong acids to memorize. Here’s the notes from today.   Set up for half titration lab.

Thursday:

pKa from half titration lab

Friday:

No school for inauguration.

Week of 1/9/17

Monday:

Ksp Lab. First half we did pre-lab. Then everyone set up the lab, but few got in a trial.

Tuesday:

Goal: to get 2 trials of data and do calculations.

HW: lab report

Wednesday:

Review for test.  Focus on Ksp by working on 17.15 to 17.55 (odd).

Thursday:

Equilibrium and Ksp test

Friday:

Start Acid/Base unit. Review pH and pOH, learn definitions of acids using Chemactivty 42, distinguish between strong and weak acids, chemactivity 43.

Week of 1/2

Monday

No school/Holiday

Tuesday:

Review of some concepts we learned before break.  Started with pg 25 and 26 in the packet.  Then I used this simulation to review LeChatelier’s principle.  To practice you did the problems on page 30 in the packet.

HW is to finish the LeChatelier Lab Q’s if you haven’t as well as do pg 35 in the packet.

Wednesday:

Review K & Q problems (ICE tables). Notes on Kc vs Kp – mainly how to convert from one to the other.  Equilibrium practice (rest of packet).

Thursday:

Solubility equilibrium – spent most of class working through first page of new solubility packet.  Then I lectured on what solubility limits and the difference between saturated, unsaturated and supersaturated w/ some demos. Here’s answers to first page and some notes.  Here’s answer to whole packet.

Friday

TBD

Would you like to receive a post card from the South Pole?

Kate Miller, a W & L physics teacher, is going to the South Pole one week from today and would love to send you a post card!

From Kate:

With only a few more days ‘til break, we’re all feeling the “final push.” Over here, I’m organizing, packing, and taking several trips to REI to prepare for my expedition to Antarctica. I leave for New Zealand in ONE WEEK and my South Pole expedition follows in early January.

I’m emailing you about a unique opportunity for you, your students, your family and friends. The South Pole Station has its very own post office (who knew?) with its very own, authentic South Pole stamp. In an effort to increase engagement, I’ll be sending postcards to anyone (seriously anyone – not just students) who is interested! I’d appreciate it if you could help me spread the word in these final days before break. Instructions for signing up for a postcards are at this link: bit.ly/SouthPolePostcards

 

I hope you and your students will follow along with my expedition while I’m gone.

  • Follow my blog at bit.ly/MillerSouthPole – scroll down and “Subscribe” to receive email updates every time a new journal is posted
  • Follow on facebook by ‘liking’ my teacher page facebook.com/MillerSouthPole – journal updates will also be posted  here as well as pictures and videos
  • Attend a “PolarCONNECT” event on January 19 (around 9:00am, exact time TBD) where I’ll give a presentation live from the South Pole (details will be posted in a journal once I know them!)

 Thank you for your ongoing support as I embark on this super cold journey!

Kate Miller

Physics Teacher

Washington-Lee High School

Week of 12/19

Monday

Today we reviewed some equilibrium concepts from last Thursday including dynamic equilibrium, writing equilibrium constants,  and solving ICE tables. We mainly did problems from the worksheet on page 17 in the packet.  The 2nd half I introduced the concept of the reaction quotient and LeChatlier’s principle. We ended with LeChatelier’s ship.

Tuesday

Today we did the Le Chatelier Exploration lab on page 31 in the packet.

HW: answer lab questions

Wednesday

Volleyball tournament! No class the rest of the week! Winter break starts!

Week of Dec 12

Monday:

Today we started with review questions on graphs and half lives.  Here’s the link to the smart notes.  I realized that I should have asked a different question – instead of a graph of concentration vs time, needed to describe how a graph of moles or mass vs time would change. Here’s the notes from class.

The second half of class we went over the Arrhenius rate constant equation and the various forms of it.  Got stuck on the graphing problem b/c I didn’t notice that you had your axes mixed up!! Bah.

HW: practice problems/ readings/ etc.

Tuesday:

Today we reviewed mechanisms….how to get rate law from the mechanism. Ended up doing some rather challenging problems with 1/2 powers! Fun!

Wednesday:

Today we reviewed for the test by working on packet problems (multiple choice, textbook, other random questions in the packet that you didn’t finish.  I also mentioned that the Dye Fading Lab had been graded and you should check the feedback I gave.

Thursday:

TBD

Friday;

Kinetics Test

Week of Dec 5

Monday:

Today we started with reading reaction rate graphs so you can understand how to get rates from a graph and so that you will understand how we get the data we used later to determine rate laws.  I had you guys work on CA 57 and for the first block.  At the beginning of the 2nd block I went over it with the power point notes and showed how to get the units for the rate constant..  The rest of the block you worked on the problems on CA 57.

HW: finish CA 57 problems (answers – will need to scroll down to find them) and read catalytic convertor and effusion/diffusion article if you haven’t done so yet.

Tuesday:

Wednesday:

Today we did the Dye fading lab.  We did NaOH and phenolpthalein this year.  Need to make it 1 M NaOH to make it work.

Thursday:

Time to work on lab / work problems in textbook.

HW: Lab, readings, HW

Friday:

First half we did some review questions (outline collision theory, why does T affect rxn rate, integrated rate law problems, method of initial rates problems).  2nd half I lectured on reaction mechanisms.  If you missed it or need a review. Check out these videos.

Reaction Mechanisms (mine)  (goals/notes you should take)

Reaction Mechanism for Fast equilibrium step before slow step (Paul Groves)

HW: Readings & Q’s (specifically about ozone this time), lab, textbook problems