Discussion experiment 7 and 11 due today. For experiment #11 you can choose to write about either Part A (the unknown metal was aluminum, molar mass = 27 grams per mole) or Part B (the unknown dissolved solid was ammonium chloride, enthalpy of solution =  +14.7 kJ/mole).  For experiment 7 the unknown liquid that you vaporized was propanol, molar mass = 60.1 gram/mole .  Remember, the lab discussion has three parts:

No FRQ Quiz 🤗

practice your FRQs on bonding IMFs and thermo in preparation for the final 

Enrichment today (7:05 am start for extra credit if you were on time to experiment #11)

Work on the practice FRQs from today.  Br prepared to ask questions for the concepts you are not comfortable with from the FRQ practice

As a follow up to our work in class today, review chapter 10 and complete questions 29-36 on page 475 and 476

Enrichment - Early start E.C. (7:05 am)

HW is based on section 6.2 of your textbook and Experiment 11.  Complete questions 41-46 from page 268.

Also, remember early start enrichment 7:05 am.

Early lab start Experiment #11 (ready to start at 7:15 am).  Prelab ready and ASA due

Read and summarize sections 6.1 through 6.4 in your textbook on the topic of thermochemistry (enthalpy, calorimetry and Hess' Law are particularly important)

As a followup to our work in class today, refer to your notes.  For each of the pairs of atoms listed complete the following:

 

Electron configuration, electron dot formula, stable ion charge after losing or gaining electrons, correct formula for the compound formed between the ions, accurate model representing the compound (pay attention to isoelectronic species, and justify the differences in ion sizes for each model)

Have a very nice Thanksgiving everyone :)  

We are quickly approaching the end of the semester (2 instructional weeks and then finals), so I have some AP material you need to cover over the week long break.  The assignment over break covers atomic structure, chemical bonding, inter-molecular forces of attraction, and states of matter.  For homework:

The link to the college board AP Chemistry description is included below.  the table of contents gives you a more complete title for each Big Idea.

 

 

FRQ quiz today (Gas Behavior Quantitatively)

All of your gas behavior FRQ worksheets are due today as well

Review chapter 5 and complete questions 77-80 on page 222

Not all gas phase chemical reactions go to completion; some are reversible and will reach a state of equilibrium.  We studied equilibrium near the end of first year chem.  As a review of the topic, read and summarize sections 13.1 through 13.3 of your textbook.

Review section 5.4 in your textbook (gas stoichiometry) and complete questions (51,53,54,55,56) on pages 220-221.

and Study for the FRQ quiz on gas behavior

Read sections 5.6 and 5.7 in your textbook which covers kinetic molecular theory (a topic we brushed on today with one of your FRQ practice questions) and complete questions 81-86 on page 222-223.

As a review of MM, density, and Dalton's Law, complete questions 52,62,64,66,70,72 on pages 221-22 of your text

Assessment today: Reactions and Solution Stoichiometry - redox, acid-base, acid-carbonate, precipitation; volumetric analysis/gravimetric analysis to determine mass percent, solution concentration, mass/volume percent

 

In addition to notes and practice, look over Expt 35, 19, 18, and your lab challenges: mass/volume percent of acetic acid in vinegar and mass percent of salicylic acid in acne medicine

Early lab start 7:15 am  Experiment #7 today.  ASA completed and prelab ready.

Finish questions 5 and 6 from the gas behavior sheet and read and summarize sections 5.4 and 5.5 from your textbook

Discussion for Experiment 35 and 19 due today.  One paragraph for each of them.  Remember to include these four items:  background/theory, relevant chemical equations, uncontrolled error analysis, and calculate the simple % error with a very brief comment on your accuracy.

 

Also, questions 1-4 from the Gas Behavior worksheet is due today.

Experiment #18 (attached here) is a gravimetric analysis precipitation experiment.  Read the experiment and prepare a prelab in your lab notebook (Introduction with theory and background, but no materials and methods and no data tables), and then complete the ASA.

 

Note that the purpose of ASA question 1 and 2 is to see how good the technique is.  If your percentage of Cl- unprecipitated (question 2d) is a very small value, then it's a good technique.  For question 2a, since silver and chloride ions will be equal, just take the square root of 1.6 x 10^-10 (from equation 1 in the intro).

Again, keeping in line with our study of volumetric analysis, complete questions 88-93 on page 175 of your text

In keeping with today's lab assignment in class, complete questions 107 through 111 from page 177 of your textbook.

This week we begin moving into a study of gas behavior and the stoichiometry of gas phase reactions.  For HW read and summarize 5.1 through 5.3 on the gas laws (this is review for us)

Study for FRQ quiz Precipitate/Gravimetric Analysis

Also, turn in the Applied stoichiometry questions from class

refer to the attached file on Applied Stoichiometry and for each question (there are five), write the balanced equation and net ionic equation.  We will fork on the stoichiometry in class

Homework is the Solution Stoichiometry worksheet from class today.  For each remaining question that you have not completed, write the balanced equation and net ionic equation.  Then try to complete the stoichiometry for each question.

Review section 4.5 and 4.6 from your textbook and today's notes.  Complete questions 36,38,40 from page 172 of your textbook.

Review sections 4.5 and 4.6 from your textbooks (and the note from class today) and complete questions 36,38,40 from page 172.

Early start Enrichment (1 pt e.c.) 7:05 am and

Also, complete the balancing redox reactions (1,4,9,11,13,15,16,17,18) from your class handout on chemical reactions, and 1-6 on the practice redox stochiometry/redox titrations handout you've worked on in class.

Early start (7:15 am) Experiment #19 (Determining the Equivalent mass of an acid by Titration)

ASA due and prelab ready

Also, complete the three questions from the Brown and LeMay textbook on acid base titration (attachment included here) and questions 8, 12 , and 20 balancing acid base neutralization reactions from your class handout with the 20 reaction questions on it.

Use your understanding of oxidation-reduction reactions to complete questions 104 and 112 (only the reactions in acid solution) from page 176-177 in your text

Early Lab start (7:15 am ready to start) Experiment #35.  ASA due and Prelab ready.

For HW

Also, bring your lab notebook Tuesday.  Attached is Experiment #35 for you to read in class on Tuesday as time permits

 

Review sections 4.1 and 4.2 in your textbook and complete questions 17-20 on page 171

small HW assignment tonight:

• two paragraphs; first one for expt 13 and second one for expt 4
• open each paragraph with the theory behind that experiment, what you were trying to discover, and the relevant chemical equations and how they apply.
• for each paragraph comment on the mole ratio of the elements in your unknown and how they were not the exact ratio we should have expected.
• Then, most importantly, talk about the specific uncontrolled errors that may have led to those unexpected mole ratios.  Be thorough and specific.

 

Experiment #6 - serial dilutions and colorimetric analysis (using the computer and labpro) of the dilutions to prepare a standard Beer's Law plot. 

Review section 4.3 on solution concentration and complete questions 32 and 34 from page 172

Today in class your group figured out the effect that not getting rid of Mg3N2 from your product would have on the mole ratio of O:Mg in your formula.  For homework consider the following possible errors and determine the effect they would have on O:Mg ratio (be thorough in your explanations):

 

Review section 4.3 and complete questions 22, 24, 26, 28, 30 pages 171-172

In our next unit, we will be looking at chemical reactions that occur in solution.  We begin with solution concentration and dilution of solutions. 

Be sure to bring your lab notebook to class.  Also, you do not need to complete today's hydrate questions at home.  You can discus them with your lab group and me tomorrow in class

Experiment 4 and 4a discussion due today.  Please type.

Here is some guidance for you:

Assessment on composition of matter today.  Study your lab notes and class notes

Read Experiment #5 (attached).  In your lab notebook, leave space for the ASA but don't write anything yet.  Then write the prelab (only introduction and materials and methods this time.  No data tables)

 

We'll work on the ASA in class Wednesday.  You'll see similarities between expt 4 and 5.

For homework tonight, complete the practice problem from the attached file.  Use Experiment #4 ASA (1a-f) as well as the your lab data calculations today as your guide

Leave an appropriate space in your lab notebook for experiment 4a ASA (but we will work on the ASA in class Wednesday), then complete the normal prelab for the experiment 4a.  thanks

 Complete the problem set on empirical and molecular formulas (1-10) from class today.  Also, choose three of the problems, and sketch a mass spectrum for each.

 Please bring your lab notebook to class Tuesday and be sure you can access the two file attachments included here Expt 4 and 4a.  you don't need to print them tonight.  just be able to access on your phone tomorrow in class

 Complete the handout Ionic and covalent compounds

 Experiment #1 Discussion due (typed). Be sure to identify your unknown liquid and solid from the list of candidates I gave you, discussing if you believe your unknown to be one of them within the precision allowed by your equipment and how comfortable you feel with your accuracy of these findings.  support all of your arguments with numerical values.  Comment on how the experiment could be improved (based on your greatest source of inherent error), and identify and discuss one possible uncontrolled error and how it has affected your results (ie density too small or too large), and explain your reasoning.

 Bring your lab notebook today

finish Rf values for experiment #2 if you did not finish in class

review the attached table of physical properties and section 1.9 of your textbook to list a sequence of steps to separate a mixture of substances 1-5 from the attached handout (do this in your lab notebook)

 Assessment planned for Friday (measurement, Uncertainty, and Error analysis of a set of data)

Refer to Thickness of foil activity, Experiment #1, and the two Practice Error Analysis problems from HW

 Assessment is today, and the following are due:  Foil Thickness, Practice Error Analysis I (the circumference of CDs) and Practice Error Analysis II (Specific Heat of Unknown metal).  Make sure all assignments are complete.  Note that for the foil thickness, we don't have an accepted value, but with % IE you can comment on how comfortable you are with the accuracy of your reported thickness value.

 Attached is a second practice problem analyzing experimental data and experimental error.  Again, tonight, complete as much as you can and be prepared to discuss with your group tomorrow things you understand and things you need help with.  Plan on our assessment Friday.

 

For the practice problem:

 Attached is a practice problem analyzing experimental data.  work on it just as you did for the aluminum foil thickness activity:  calculate, average, % inherent error, absolute error to maximum and minimum, compare against the accepted value.

 

Do as much as you can.  You will have an opportunity to go over it with your group on Wednesday in class.

Leave one page (two if you want) in your lab notebook, then complete the Advanced Study Assignment for both Experiment #2 and #3.  Attached files are two the right.  They can be on the same page since these two experiments go together.  PLEASE DO NOT DUE A PRELAB FOR THESE

 Complete the following questions from pages 35-36 in your textbook (80, 81, 83, 84, 90)

 Download the Course Syllabus, Safety Guidelines, and Lab Report Format for AP Chem (the files are on the right side of this page).  Turn in the required signature pages.

 

Use the Lab Report Format as a guide to complete your "Prelab" for Experiment #1 (see files to the right).  For each lab experiment, you begin with what we call an "Advanced Study Assignment."  You will find it at the end of the experiment attachment.  The Advanced Study Assignment is the first thing you write for your experiment, before introduction.