Chatsworth Charter High School

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Due:

Study for FRQ quiz Precipitate/Gravimetric Analysis
Also, turn in the Applied stoichiometry questions from class

Due:

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

Due:

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.

Due:

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.

Due:

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.

Due:

Early start Enrichment (1 pt e.c.) 7:05 am and
FRQ quiz redox stoichiometry today
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.

Due:

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.

Due:

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

Due:

  • Enrichment today (7:05 am start extra credit). 
  • FRQ quiz today (Colorimetric Analysis): prepare and dilute solutions; theory and practice of colorimetry/spectrophotometry; Beer's Law graph and analysis; uncontrolled error analysis
  • Question #3 from the attached file on Redox Titrations (this question is similar to expt 35)

Due:

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

Due:

For HW
  • Read section 4.9  in your text (oxidation number and balance redox reactions) and complete questions 70 and 72 on page 174.  Regarding question #72: "oxidizing agent" means that it causes something else to be oxidized while itself is reduced; "reducing agent" means that it causes something else to be reduced while itself is oxidized.
  • Read section 4.10 in your text (which is related to our topic in class today).  Make an effort to try and complete questions 74a and 74d.
Also, bring your lab notebook Tuesday.  Attached is Experiment #35 for you to read in class on Tuesday as time permits
 

Due:

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

Due:

small HW assignment tonight:
  • finish your Beer's Law graph from today's lab and use it to determine the concentration of the unknown two ways: (1) by estimating from graph and (2) by calculating the slope of your line and using the straight line's formula to determine the unknown concentration.
  • Read and take notes form the attached file on the theory behind spectrophotometry/colorimetry

Due:

Experiment 13 and 4 discussion due today.  Please type.
Here is some guidance for you:
  • 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.

Due:

We'll do an early lab start today (our first this semester).  Please arrive by 7:15 am ready to start lab.
 
Experiment #6 - serial dilutions and colorimetric analysis (using the computer and labpro) of the dilutions to prepare a standard Beer's Law plot. 

Due:

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

Due:

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):
  • sample heated too strongly so that smoke containing particles of magnesium oxide product escapes from the crucible
  • after adding water to react with Mg3N2, sample was not heated enough to drive off excess water in the crucible
  • original magnesium sample was not pure, and there was some aluminum metal mixed in.  Aluminum metal oxidizes to Al2O3
 

Due:

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

Due:

In our next unit, we will be looking at chemical reactions that occur in solution.  We begin with solution concentration and dilution of solutions. 
  • Read section 4.3 in your textbook on the composition of solutions and carefully review each of the sample exercises 4.1 through 4.7 that occur throughout that reading.
  • Attached you'll find experiment 6 which is based on these concepts.  Read the experiment and leave space in your lab notebook for us to complete the ASA in class.  Then do a complete prelab: intro, materials and methods, and set up appropriate data tables for data collection.  We will begin the lab in class tomorrow.(not an early start yet).
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

Due:

  • Complete the following hydrate problems from the two attached worksheets.  You've seen these two attachments before: combustion/hydrate worksheet, question #3; composition of matter chapter 2-3 worksheet, question #5 and #6.
  • Also, prepare a prelab for Expt 13 (attached here) in your lab notebook after the ASA we did in class today.  Intro, materials and methods (This time you create it yourself without a document prepared for you.  Think about the data you are gathering and the process you started today in class), and results data (again, create it yourself without the aid of a prepared document).

Due:

Experiment 4 and 4a discussion due today.  Please type.
Here is some guidance for you:
  • two paragraphs; first one for expt 4a 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.
  • Here are some possible uncontrolled errors:
    • Expt 4a:  magnesium not heated long enough to oxidize all of it to magnesium oxide; not enough water added to react with all the magnesium nitride that forms; heating so intense that smoke containing magnesium oxide particles forms and escapes.
    • Expt 4: since you carried out this experiment, I will leave it to you to think about the possible uncontrolled errors.

Due:

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

Due:

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.

Due:

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

Due:

  • Try and finish your expt 4 ASA through question "g" (the formula for the metal chloride salt).  You don't have to go further yet.
  • Review sections 2.2 and 2.3 in your textbook and complete questions 25-28 on page 70

Due:

  • Re-read experiment 4 and complete the prelab (introduction and materials and methods) for experiment 4 as well as the rest of the data table.  You do not need to attempt the ASA (its an especially challenging one).  We will complete the ASA and lab in class Friday.
  • I've attached a copy of sample data for experiment 4a from a previous lab class.  Read the attachment, and take this data as your own and complete the calculations, and any other questions asked for on the attachment

Due:

  • Finish the ASA for expt 4a
  • Finish question #9 from the composition of matter questions you worked on in class today
  • Make an attempt to complete question #8 also.  Hint: calculate the % chloride in the other sample; using that percentage and the mass of the original sample, calculate the mass of chlorine in the original sample, and then calculate the oxygen as you have been doing.
  • Also complete questions 1 and 2 from the attached file on combustion analysis problems.  Note that question #1 is written correctly.  You just have to think your way through it.  Question #2 is straightforward

Due:

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

Due:

 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.

Due:

 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

Due:

 Complete the handout Ionic and covalent compounds

Due:

 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.

Due:

 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)

Due:

  •  Bring you lab notebook on Monday
  • Read sections 2.1 through 2.5 in your textbook

Due:

 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

Due:

 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.

Due:

 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:
  1. calculate the specific heats for each unknown sample and the % inherent errors (% IE)
  2. average specific heat with appropriate % IE
  3. maximum and minimum
  4. calculate maximum and minimums for the two known substances (iron and aluminum) and use your results to determine if your unknown is likely one of those two.
  5. determine the greatest source of error in the experiment
  6. comment on how you feel about the accuracy and precision of your findings

Due:

 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.

Due:

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

Due:

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

Due:

  •  Bring your lab notebook with you on Monday
  • Read sections 2.1 through 2.5 in your textbook

Due:

 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.