The Storm!

AP Chem students,

If you are checking this, good! Please spread the word.  The plan is that the test on chapter 5 will occur on Wednesday during F and G!

 

Week of 15-19

Monday we spent time reviewing for your double displacement reactions test on Tuesday by going through some of the practice problems in your double displacment reactions packet.   The second half of the class we spent doing more redox reaction practice – balancing redox reactions in basic solution and starting the microscale redox titration lab.

Tuesday you took your double displacement test.

Wednesday you did the redox titration lab

Thursday we reviewed for the redox test by having each group make practice tests.  I did some demos to show how certain gases could be detected: CO2 extinguishes a flame, oxygen allows a flame to last longer/ grow brighter, H2 makes a popping sound (but I didn’t show that one because I couldn’t make it work in time for class).   I also showed how nonmetal oxides when bubbled through water form acids (CO2 bubbled through water change the pH.  Next year I should probably do the Ira Remsen rxn and remind you have acid rain!

Friday will be your redox and synthesis/decomposition test.  Objectives C and D on the reactions objectives of this document.

Quizlet for AP Chem Reactions

 

Week of Oct 8-12

Announcements:

Changes to schedule

  • Next test: Tuesday, Oct 16 on Double Displacement Rxns only.  This includes net ionic rxns, drawing pictures of aqueous solutions and knowing solubility rules.  This will also count for a solutions retake for those of you that want it.  So review dilution calculations as well!
  • Mon., Wed., Thurs. will be spent working on redox rxns.  Redox Test on Friday.  You will need to know how to use/create the Activity Series, write half reactions, balance redox rxns in acidic and basic solutions, predict single replacement reactions, know redox vocab.

What happened this week: 

We started the week with a practice reactions test. It turned out to be super challenging for most of you, so I decided to break it down into smaller chunks over the next couple of weeks.

On Wednesday you all worked on the Activity Series Lab after having watched the redox movies for homework (some of you worked on your percent yield lab instead).

On Thursday we practiced review some redox vocab with this powerpoint, practiced predicting products using the activity series and the Standard Reduction potential chart you’ll have on the AP exam and then learned to balance more complicated redox reactions in acidic solution.

On Friday we went over answers to the activity series lab and all my expectations for the percent yield lab (Checklist!)

Some of my advice:

  • Data notebook: should have all your data, purpose, copy of procedures pasted in (no specific step by step procedures required – just the outline I gave you), hypothesis either typed or handwritten, illustration of hypothesis (showing molecular level)
  • Data Collection: observations, measurements for making initial solutions as well as dilutions, measurements of precipitates and filter paper (all with uncertainties)
  • Data Processing: sample, labeled calculations of theoretical yield (with indication of how limiting reactant was determined), dilution calculations (these should be in procedures section, actually), percent yield.   Put results in a labeled table.
  • Conclusion: follow checklist, really put alot of thought into errors.  Justify the validity of your data.  Not too much to say about precision since there was only one trial.  You’ll just have to use any uncertainties to address precision.

Homework: Lab write-ups

Oct 1-3rd: Reactions

Monday Oct 1st we started our new unit: reactions.  The goal was to review the various types of reactions and practice making predictions.  I handed out the new unit outline and a big packet of reactions practice that included acid naming, classification and generic prediction practice followed by metathesis reaction practice.   You should be able to define all the vocabulary listed for Monday on the unit outline as well as know the objectives listed for Monday.

On tuesday you did the Chemical Change lab.  It took forever because the concentation of sodium hydroxide was too small, but in the end everyone was able to complete the reactions and take data.  Homework was on the unit outline.

On Wed. we spent all class reviewing net ionic reactions and writing state symbols for the reacitons in the chemical change lab. Homework was on the unit outline. I handed out the answers to the metathesis prediction (also includes answers to Thursday’s practice).

On Thursday we went over oxidation state and synthesis and decomposition reactions using handouts that I don’t have electronic copies of.  I handed out copies of these oxidation state rules, though.  You also had time to work on your percent yield lab. I handed back feedback on your hypothesis and asked you to edit them and make an illustration of it in your lab notoebook (draw molecules / net ionic equation). Those of you who have not yet finished writing procedures to do so and to share your procedures with me.

Here is a link to the vacuum filtration video you should watch

Here is a copy of the Smart Board Notes from Tuesday – Thursday.

Next class you should complete the Percent Yield Lab