Select Page

Archive – week 7 – 19-20

Week of 10/14 – 10/18
*Please REFRESH this Page every time you view!!!
10/14 – Monday – Columbus Day – “Indigenous peoples Day”
He discovered America?  But he only made landfall in the Bahamas and Cuba?  Wait didn’t the Vikings make the voyage?  Wait the Chinese mapped out the America’s 70 years before the voyage?  Wait, didn’t native american Indian’s “discover” the America’s first?  Wait wasn’t the America’s already here?
I think I should get a National Day!  I discovered Google Forms with Checkbox grids!!!  We will “recognize” next Saturday as National Grodski day and Yes you will not have to go to school!
You will have a form unfortunately…:)

10/15 – Tuesday  –  period  2 
*I know some are ACTing today so if someone in your group is present please have them attain the data from this lab so that you can continue with Lab 6 write-up.
1. Lab 6 – Empirical Analysis of Copper Iodine
FIND YOUR FLASK THAT YOU PUT Cu (s) and I2(s) into last Friday. Be careful not to open another groups flask!
    a) Determine how you should mass out the contents of the reaction vessel so that you
         figure out as a lab group how you should go about determining the 
                 i) mass of the copper reacted.
                ii) and the mass of iodine reacted.
*The electric balances with (piezo electric crystals) are on every other lab table.
     b)  Place the stopper back on your Erlenmeyer flask so that the Iodine crystals do not sublime AWAY!
          Place your stoppered flask and unreacted copper in the cart where designated.
    c)  If you are handling the copper iodine (flaky green compound) you should put on gloves.  Everyone should be              in goggles.  I have provided plastic weighing boats for the compound if needed along with spatulas for            
          scraping.  Use paper towels to dry the unreacted copper if necessary. Place the copper Iodine in   
          the proper waste container that is marked in the cart when you are done with your measurements.
    d) Include lines in your data table that represent what you measured to GET the grams of copper reacted and      
         the grams of iodine reacted.
    e)  Write your procedure that includes what you did to get the grams of the copper reacted and iodine reacted.
    f)  Calculate the Empirical Formula of copper Iodide.
    g) Write a balanced chemical reaction for the synthesis reaction of copper iodide based on your empirical  
     h)  Calculate the theoretical (pencil and paper math) grams of copper iodide based on your empirical  
      i) Calculate the percent yield.
     j) Design and implement a group interpretive dance.
    K) Continue with Lab write-up using the Lab requirements posted at the end of this week below:
                            – period 3/4 – 
1.  Lab 6 – Data Collection/Calculation and Lab Write-Up.
Continue with Lab write-up using the Lab requirements posted at the end of this week below:
10/15 – Tuesday  Homework – 
1.  Lab 6 – Write-up Due Friday – We will be adding a concept this week that you will be able to add to the Lab.
2. Please View Lecture 1.5 below on Molar stiochiometry 
3. Complete the worksheet and review with Key
Stiochiometry 3 – Molarity limiting reagent.pdf
View Download
Stiochiometry 3 – Molarity limiting reagent Key.pdf
View Download
End of Tuesday..

Lab write-up requirements: At The END OF THE PAGE!

10/16 – Wednesday  –  period 2/3/4
10/16 – Wednesday Homework
1. Lab 6 write-up!
Tuesday night’s homework was about a concept that you could add to your discussion/conclusion.
Remember I grade these Labs holistically.  Meaning if they ooze with effort and you make a mistake then I will take off less points than someone who makes the same mistake but does not provide the same effort.
I will read and add comments and then you give you an chance to make changes BEFORE I GRADE!

10/17 –  Thursday – period 2 – 
1.  Limiting reagent Demo
2.  Chart method of limiting reagent problems/Classwork
Redo of Monday’s homework with moles and chart.
Limiting reagent intro demo new worksheet.pdf
Today’s Demo: Limiting reagent of ethanol and oxygen.
                                           period 3/4 – 
1.  Complete the Conservation of Mass Presentation
        a) Hindenburg
        b) Pringles redo/ Dynamite soap

Law of Conservation of Mass

2.  Limiting reagent Demo
3.  Chart method of limiting reagent problems/Classwork
Today’s demo: Limiting Reagent Demo:
Today’s Limiting Reagent Lesson:
10/17 –  Thursday’s Homework – 
1. Complete the backside (questions 3 and 4 ONLY) of the  
Limiting reagent intro demo new worksheet.pdf with the video posted below.  Start the video at 16:26 as you are not held accountable to questions 1 and 2 yet. We will be using the concept of limiting reagent in different type of AP Multiple Choice Problems. 
Back side (questions 3 and 4) of the Classwork worksheet today:
Limiting reagent intro demo new worksheet.pdf
2. Please complete Stiochiometry 3 – ICE Table Molarity Salsa.pdf  which is really the second problem the homework Tueday night (Stiochiometry 3 – Molarity limiting reagent.pdf).  So please redo that limiting reagent problem using the ICE Table method. Don’t be mad that this way is simpler!!!  Remember that moles will be calculated through Molarity (M * V(in Liters) = moles.
                                                                     Molarity ( mole / Liter )   X   Volume (Liter)  = mole
Stiochiometry 3 – ICE Table Molarity Salsa.pdf
View Download
3. Please review with the key that will be posted.  You will be getting the same answers as Monday night but by DOING IT A DIFFERENT WAY!  It is all about understanding the process NOT just the answers here.
Stiochiometry 3 – ICE Table Molarity Salsa key BEST p.pdf
View Download
4.  Complete the Short Form from a Tall Teacher below:  
      If you do not follow my order above and do this first you will find this difficult.  I have a plan!         
      Please Trust it!
Limiting Reagent Short Form:

Limiting Reagent Form 1920

End of  Thursday!

10/18 –  Friday –  period 2/3 – 
1.  Lab 7 – Gravimetric Analysis of a Metal Carbonate – (precipitation analysis) – 
                   Introduction to lab. Identifying unknown through g/mol.
2.  Discussion of Bernouli’s Principle that explains how the aspirator creates low pressure.
3. Lab 7 – precipitate out the carbonate ions and filter the calcium carbonate by the Buchner  
     Funnel and an aspirator.  Placed our precipitate in the oven to dry for Monday.
     Data gathering for Lab 7 –
     Measure your data from Lab 7 – Gravimetric analysis of a metal carbonate.
    a) dry out carbonates with microwave.
    b) attain dried mass of unknown carbonate.
    c) Dissolve in water (about 200ml)
    d) Add 125 ml CaCl2
    e) filter precipitate with aspirator and Buchner funnel.
    f) dry out precipitate (put measured filter paper on watch glass) in oven.
4.  Lab 6 – Error Discussion using the diagram.
                                       period 4 – 
1.  Lab 6 – Error Discussion using the diagram.
2.  Lab 7 – Gravimetric Analysis of a Metal Carbonate – (precipitation analysis) – 
                   Introduction to lab. Identifying unknown through g/mol.
3. Lab 7 – Started the lab by measuring the mass of unknown carbonate and adding excess calcium  
                   chloride to make the precipitate.  I covered your beakers and we will filter Monday.
10/18 –  Friday – Weekend Homework:  *Quiz MONDAY ..Hints Below!!!
*If you need it please make one more submission to last nights Limiting Reagent Form.
1:  Please complete – Stoichiometry 4 – Precipitation – limiting reagent .pdf side one with me with the video below and then complete the side 2 with the key or with second video.
Stoichiometry 4 – Precipitation – limiting reagent .pdf
View Download
Stiochiometry 4 – Precipitation – limiting reagent Key p.pdf
View Download
Stoichiometry 4 – Precipitation – limiting reagent .pdf – Problem 1 (1st side):
Your quiz is based on these problems!

Stoichiometry 4 – Precipitation – limiting reagent .pdf – Problem 2 (2nd side):
Your quiz is based on these problems!
End of week 7!
*Next week – TEST 2 – Analytical Chemistry Topics – Maybe Thursday.
    Please see the Test 2 – Review Page for your studying desires.
Long Range Planning:
 Test 2 may be next Friday on Analytical Chemistry.  Everything we have done SINCE the Electrochemistry (which includes the Labs) .. I should have all labs back to you Monday.
Test Topics:
 Worksheet   Worksheet Key   Tutorial Videos
 Analytical Chemistry I – determining chemical formulas.pdf
View Download
 Analytical Chemistry I KEY- determining chemical formulas.pdf
View Download (#1)   (#3)

 Analytical Chemistry II – Mol,Dilution, precipitation analysis.pdf
View Download 
 Analytical Chemistry II KEY NEW – Mol,Dilution, precipitation analysis.pdf
View Download   (#1)  (#4,5)

 Stiochiometry 1 – balance yield.pdf
View Download
 Stiochiometry 1 – balance yield key.pdf
View Download (#1, #3)
 Stiochiometry 2 – limiting reageant -.pdf
View Download
 Stiochiometry 2 – limiting reageant – Key.pdf
View Download  (#1)
 Stiochiometry 3 – Molarity limiting reagent.pdf
View Download
 Stiochiometry 3 – Molarity limiting reagent Key.pdf
View Download   (#1)

 Limiting reagent intro demo new worksheet.pdf

 we have yet to do this
 Lab 6 –  silver oxide
Lab 7 – Copper iodide  

Analytic quiz wed

Next week…

End of week 7!

Weekend HW:  : LAB 2   HERE IS AN EXAMPLE (link to a AP student’s lab last year)
Using the general rubric below and the one explained in the Lab Report Rubric link I gave out I would like to see the following sections in your Lab write up.
There is another example posted in the Lab Report Rubric.  I am requiring these sections below to be titled and included in your lab report but you are making this lab your own.  Although we did the same data collection and experiment, you are to make your lab unique in the lab write-up.  You will spin this lab to your interests by writing a unique background that will cover a least a page single spaced or 2 pages double spaced.  Use this opportunity to research something about Plants or Light that may relate to your experiment.  This is something that you will bring back into your discussion in your conclusion.  This could really be anything related to your experiment or the Fast Plants BUT you must direct your discussion to your Question and then Hypothesis. 
1: Title Page – Your name, Date, Title of experiment
2:  Background – Your background is like a literary review of the topic in a published study. I am not asking you to write a term paper on the Fast Plant but I am asking you to write an essay on the ANYTHING that is remotely related to this investigation.  Develop your Background so that your discussion eventually LEADS to a Question that you will test with your Hypothesis.  Write it as a prosecutor would deliver their opening statement to set the stage for their argument. I know this is open ended but this is how you make this lab your own.  Do make this a cohesive piece of writing and you may probably need to investigate this information.  At the end of the lab I will ask for your resources, so make note of where you are gathering information. DO NOT MAKE THIS a bunch of unrelated ideas or facts.  I gave you some example below from past students of mine so take a look to get a feel of what I am asking. This part of your lab should be 1 page single spaced or 2 pages double spaced.
3:  Objectives/Hypothesis: We normally use objectives here instead of Hypothesis as we are trying to find      
4.  Materials: List all chemicals, equipment and tools used.
5: Procedure:  Step by step instructions on how you would complete this experiment. Please bullet this section!
                                  A good procedure is one that another could easily follow to repeat the experiment successfully.
6:  Data:   Graphs, Data Tables, etc.
                    Please make a Data table, like the one’s you have had from my handout of other labs that include 
                    those values that you actually measure AND those that you calculate for.
                    * You need to pay close attention to units, significant figures , and precision of equipment.
                    * You should provide the actual ratios (non-rounded) to use in your error analysis.
7: Calculations and Chemical Formulas:   On a separate page, provide all calculations and chemical  
                                                                                        formulas that are pertinent to the lab.  You could do this neatly on 
                                                                                        piece of paper and then scan or take a picture with your phone and                                                                                         insert into the shared doc.  No separate piece of paper that is NOT                                                                                         inserted will be accepted.
           *Example: Your percent yield calculation requires a balanced chemical formula that will be determined                                        from your empirical formula of copper Iodide.
8: Results:  Summarize your data, but do not make conclusion statements. This will be a short section.  A    
                        couple sentences will usually suffice.  This summary will only report the most important information  
                        that coincides with the objectives written.  
                        In your lab conclusions, your first paragraph was really a results section.
9: Conclusion:  This section will be heavily scrutinized.  Here is where you get dirty with the data. What is the data inferring about copper iodide?  What are the implications or possibilities because of your outcomes.  What could be further investigated?  
If you get vague you will lose points. You must fully develop your points and support them with logic! Remember that many experiments are built from the conclusions of other labs.  This means your points in your discussion will not be facts but just very good possible explanations.  Another experiment would be needed to test the validity of these statements. However,  if you support your statements with solid logic from evidence collected in the lab then you are addressing all the possible implications from YOUR WORK or experiment.  In this point of your conclusion you will be MAKING A LEAP from your work based on data analysis to a POSSIBLE implication Chemically for copper iodide.  If you do this by tying the Background discussion with your discussion here it will result in very will impressive lab write – up! 
Please make sure your conclusion covers three basics:
            A:  DATA analysis:  complete detailed analysis of the the hard data collected.
                      This has nothing to do with error analysis!!! What does the data suggest? The   
                     data “suggests” or there is a possibility. Use the Results section and objectives as a guide                     here.  What was your formula?  Is it empirical? Molecular?  What is ratio represent                                chemically?  How strong is the evidence that your formula is what you think it is?
                     How does the percent yield support or not support your ratio here?
            B:   A LEAP:  You need to explain what the data means in terms of the chemistry of the compound. This                                             really the reason for the investigation.  Fully develop your thoughts based on your evidence.  
                                    Be logical and make your case as if you were a lawyer trying to convince a jury of your                                                     argument.
             C:  Error Analysis:  What are the possible limitations in your lab.  Every experiment has limitations. What    
                       were the limitations in this experiment. What could be done to narrow our approach to better the 
                        questions you laid out in this lab.  
                                    *Your guide here is your actual ratio and your percent yield!
* DO NOT MAKE comments that are not logical and are not supported by the evidence.  This is an area of conjecture and speculation so it cannot be wrong unless you do not fully develop your thoughts and support your statements with sound logic.  
10. Sources – Just give me web address of the sites that you got information from.