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   Q4 : Week 1 – 4/17 – 4/21

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    _______________________________________________________                                 Jump to:  Monday Homework         4/17 – Monday – A Day – 2/3a Lab, 4 

Main focus –                                                                                                                                                         
                                                  

    a) To Begin Practice Test 4 – First Full in class AP Test

 

Period 2/3a:  

1. Lets see how much we have been reviewing as a class on the Practice Test from Spring Break:

PRACTICE TEST 2 – Part one – Multiple Choice – (Completed during the Spring Break).

Let’s see:       In this Part 1, the class averaged 24.88 questions correct :  50 – 24.88 =  25.12 incorrect answers.

25.12 incorrect answers  x  26 students taking the practice test 7 part one =  653.12 total incorrect answers for ALL students.

16.9 hours watched / 653.12 incorrect answers =  0.02587 hours per question if reviewed if EVERYONE reviewed their work!!

           0.02587 x 60 minutes = 1.56 minutes per question reviewed = NOT getting it done!!!

 

PRACTICE TEST 2 – Part 2 – FRQ – (Assigned during Spring Break).

This of course was even worse!!!

 

2. Practice Test 4 – MC – Part 1:

  

Part 1: Multiple Choice (normally 60 questions) – 90 minutes
 
90 minutes for 60 questions = 90 minutes/60 questions = 1.5 minutes per question is YOUR Pace!
 
 Practice test 2 has 50 questions = 50 x 1.5 = 75 minutes needed to complete part 1.
They keep 10 MC questions private. 

 

1. Start and complete Practice Test 7 – Part 1 – MC ( 75 minutes total)                                                           
2. Enter you answers with the form below.

Period 4:  

35 minutes – Start Practice Test 7 – part 1 – MC – (75 MINUTES TOTAL) 

1. Practice test AP Exam 7 – – 4th quarter Exam Grade – completing a full test for AP Grade of 1 – 5 .
 
Part 1: Multiple Choice (normally 60 questions) – 90 minutes
 
90 minutes for 60 questions = 90 minutes/60 questions = 1.5 minutes per question is YOUR Pace!
 
 Practice test 2 has 50 questions = 50 x 1.5 = 75 minutes needed to complete part 1.
They keep 10 MC questions private. 
 
 
We will now use the newer AP Chemistry Reference table!
2013 AP Chemistry reference tables.pdf
View Download
 

3. Gain access to the Part 1 resource.   

 _____________________

TODAY’s NOTES: 

Period 2/3:  (Completed Practice Test 4 – Part 1 – MC )

75 minutes today 

Tomorrow: Start part 2 – FRQ of Practice Test 4

105 minutes tomorrow 

Period 4:  (Started Practice Test 4 – 35 minutes)

35 minutes today out of 75 minutes =  40 minutes tomorrow.

 Tomorrow: Complete Part 1  – MC of Practice Test 4 – start FRQ

 

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4/17 – Monday’s Homework: –

Period 2/3: Please begin your review of the your MC Practice Test 4 with the linked video. You will do the Spectrophotometry Homework tomorrow.

Period 4: Please Complete the spectrophotometry homework below:

Spectrophotometry FRQ practice – The AP Loves the spectrophotometry labs  – Period 4 only!!!                                                                                                                                                                                                            1. Please read through my notes below on how we completed 2 labs using the spectrophotometer. 

 
2. Please complete the older part 2 questions that will review spectrophotometry labs.  There is no need to time                  yourself here.  I would like you to think about these questions and how they relate to the 2 spectrophotometry labs that we completed.    
 
In your reference tables:   A = abc
 
        A = absorbance (- log of Transmittance)  
                 Transmittance is the ratio of light reaching the detector to the light being emitted from the source.
               The more that light is absorbed, the lower the light hitting the detector and thus the lower the          
                Transmittance.  This number will be less than one so we perform a .-log on its value to make it positive                    and a larger that 1 value and when we do this it becomes Absorbance. 
 
        a = absorptivity constant (proportionality constant like R for gas laws or k for rate law)
       b = path length (distance that the source light travels to the detector)
       c = Concentration of colored chemical (Molarity chromophore or crystal field)
 
So based on A = abc the Absorbance is dependent upon the concentration of the colored chemical and the distance that the light has to travel through the cuvette.                                                                                                         
-Percent mass of copper in brass: 
Brass shot (alloy of Cu & Zinc) was dissolved with nitric acid. The solution was blue due to the crystal field splitting of Cu+2 with water. The Zinc in the alloy (Brass) also dissolved but it has no color.  We performed a serial dilution of a known concentration of [ Cu+2 ] and we put theses known concentrations in cuvettes and determined the Absorbance of each known concentration (after we set the spectrophotometer to absorb a certain wavelength of the Cu+2  solution called the peak wavelength).We plotted a Beer’s Law graph (linear relationship of diluted [ Cu+2 ] with lowered Absorbance. We (logger pro) plotted the graph of measured absorbance with Known concentration (we used the keep button to add the concentrations for each measures absorbance of the known concentrations).
 
We made a line of best fit and we used the slope and y intercept data to help with the next part
 
We then took the dissolved Cu+2  from the brass shot and made a 100.0ml solution.  We put that in a cuvette and measured the absorbance. Using this absorbance, and the Beer’s Law graph (utilizing linear algebra, y = mx +b from the regression line of the graph) we determined the concentration of the dissolved [ Cu+2 ].  We used that to calculate moles and then percent by mass.
 
Love this lab!                                                                                                                                                                                       
Determining the order of  reaction (with respect to Crystal Violet) of reaction (CV) with OH_
 We did not get to this lab this year but please read its procedure. It’s very simple but has some important lab concepts. In this lab we placed a known solution of [CV] with is a chemical indicator (or a chromophore!) with a known concentration of OH– into a cuvette in a spectrophotometer that plotted the Absorbance decreases in real time for 30 seconds. We identified the order of the CV while keeping the [OH–] constant.  (The concentration of the OH– was so much larger than the dilute CV that we also assumed that its concentration did not change significantly.) From the absorbance data we collected, we assumed that the concentration of the CV was proportionate to the changes of the Absorbance. (A = abc and because a and b are fixed values for the experiment we used the concept that A is proportionate to c which is concentration) Remember that over time the cuvette changes from a purple color to clear. How much it turned clear was an indication of the RATE of the reaction!  Using the absorbance values collected for each time interval as the proportionate concentration we changed the absorbance values to ln [A] and 1/[A) respectively and then made a new graph of each.  The graph that was the most linear determined the rate order with respect for CV.
 
Ok I love this lab too! Unfortunately we did not have time for this lab.
 
Please complete these FRQ’s below and review with the key and your the video below:
Also Feel free to look through. the Spectrophotometry presentation below:
 
2006 Free response question 5 – spec.pdf
View Download
 
2006 Free response scoring guidelines ques 5 spec.pdf
View Download
 
Spectrophotometry AP question 2 – 2003 .pdf
View Download                                                                                                                                            
 

Spectrophotometry AP question 2 – 2003 AP Key.pdf

 

General Spectrophotometry Review and question 2006 review:

General Spectrophotometry Review and question 2003 review:

  
Practice Test 4 – MC  – 22/23 FORM:  PERIOD 2/3 ONLY today!

Practice Test 4 MC review:

_______________________________________________________________________                                       Jump to: Tuesday Homework / TOP 

4/18 – Tuesday – B Day – 2, 3b/4 Lab

Main focus –                                                                                                                                                         
                                                  

    a) To Complete the Practice Test MC – period 3/4

    b) To Begin the Part 2 of Practice Test  – both periods 

Period 2:  

1. Begin – Part 2 – FRQ – Practice Test 4 – 105 minutes Total
 
35 minutes out of 105 = 70 minute in the double period tomorrow to finish FRQ and entire test
  

Period 3b/4:

1. Complete – Part 1 – MC – Practice Test 4 – 75 minutes Total
 
40 minutes left (35 minutes yesterday) out of 75 minutes Total 
 
2. Enter MC questions into the form posted above under the Monday homework section.                                 
3. Begin – Part 2 – FRQ – Practice Test 4 – 105 Total minutes Total
 
25 minutes out of 105 = Continue with it tomorrow.        
 
                                                                   

  _____________________

TODAY’s NOTES:

The FRQ section PACING:
                                                                      10 points = question 1  :  10 points x 2.3 min/ point =  23 minutes
                                                      10 points = question 2  :  10 points x 2.3 min/ point =  23 minutes
                                                      10 points = question 3  :  10 points x 2.3 min/ point =  23 minutes
                                                        4 points = question 4  :    4 points x 2.3 min/ point =   9 minutes
                                                        4 points = question 5  :    4 points x 2.3 min/ point =   9 minutes
                                                        4 points = question 6  :    4 points x 2.3 min/ point =   9 minutes
                                                        4 points = question 7  :    4 points x 2.3 min/ point =   9 minutes
                                                  46 points Total                                                                    105 minutes TOTAL                                                                                                                                                                                                     
                                                          105 minutes / 46 points  = 2.3 minutes per part 2 question thus
                                                          10 point question ≈ 23 minutes 
                                                            4 point question ≈    9 minutes    
      
                                                     

4/18 – Tuesday’s Homework: – 

 

Period 3: Please Complete Spectrophotometry Homework tomorrow that was posted above on Monday. You have the hard copy of the practice FRQ’s.

Period 4: 

1. Please Review your guessed correctly and answered incorrectly MC answers using the video for the MC section of Practice Test 4. You will need to be given access to view this private video.  Please contact me if you are having trouble accessing it.  

THE MOST IMPORTANT THING YOU CAN DO IS REVIEW YOUR INCORRECT ANSWERS! 

 

  
Practice Test 4 – MC  – 22/23 FORM:  PERIOD 3/4 ONLY today!

Practice Test 4 MC review:

_________________________________________________________________________________________________________________

4/19 – Wednesday – A Day – 2/3a Lab, 4 

Main focus –                                                                                                                                                         
                                                  

    a) To complete / continue with part 2 of Practice Test 4.

Period 2/3a:  Practice Test 4 Completed.

1. Complete Part 2 – FRQ – Practice Test 4 – 105 minutes Total

 70 minutes (35 min yesterday) out of 105 
  

2. Assign FRQ Review Video. AP Central Scoring Key given out tomorrow. 

Period 4:
 
1.  Continue Part 2 – FRQ – Practice Test 4 – 105 Total minutes Total
 
        40 minutes out of 105 = Continue with it tomorrow.  

 

65 minutes (25 minutes yesterday) will be completed out of 105 minutes.

 

 We will now use the newer AP Chemistry Reference table!

2013 AP Chemistry reference tables.pdf
View Download
 

 

  _____________________

TODAY’s NOTES:

The FRQ section PACING:
                                                                      10 points = question 1  :  10 points x 2.3 min/ point =  23 minutes
                                                      10 points = question 2  :  10 points x 2.3 min/ point =  23 minutes
                                                      10 points = question 3  :  10 points x 2.3 min/ point =  23 minutes
                                                        4 points = question 4  :    4 points x 2.3 min/ point =   9 minutes
                                                        4 points = question 5  :    4 points x 2.3 min/ point =   9 minutes
                                                        4 points = question 6  :    4 points x 2.3 min/ point =   9 minutes
                                                        4 points = question 7  :    4 points x 2.3 min/ point =   9 minutes
                                                  46 points Total                                                                    105 minutes TOTAL                                                                                                                                                                                                     
                                                          105 minutes / 46 points  = 2.3 minutes per part 2 question thus
                                                          10 point question ≈ 23 minutes 
                                                            4 point question ≈    9 minutes    
      
                                                     

4/19 – Wednesday’s Homework: – 

 

 * I am planning a review session for this Saturday – 9:00 am – 11:00 am.

PLEASE RSVP SO I CAN SEE WHO CAN ATTEND AND FIGURE OUT HOW MANY BAGELS I NEED TO FIND.

  

Period 2/3 and Period 4:
 
1. Please Complete the Practice Test    – Part 1 (questions 1 – 25 ) Sprint Form.   
It will be a timed form (30 minutes). You will be doing half the MC questions from the next test,  You will not your score back until you finish the entire test the next day. 
 
There will be a link posted below for this form and the questions will be embedded in the form. Please have a reference table and pencil and paper to do scratch work AND A CALCULATOR!
 
 
2.  Please complete questions 1,2 or as much as you can from from the 2021 AP Chemistry FRQ. My students took this 2 years ago. I am collecting this Friday so the more you do tonight the less you have Thursday night.  Obviously the solutions to this test are posted everywhere so I included my solutions below to help review. 
*Make note I made mistake in 1(f).  What was my error? 
 

 

2021 Grodski Solutions :

________________________________________________________________________                              Jump to: Thursday Homework / top.   4/20  – Thursday – B Day – 2, 3b/4 Lab

Main focus –                                                                                                                                                         
                                                  

    a) To give back graded Practice Test 4 – period 2 and review FRQ.

    a) To complete Practice Test 4 FRQ – period 3/4

Period 2:

 
1.  Hand back graded FRQ / AP Grade / scaled Percentage score. – Gave out Scoring Guidelines.
 

2.  Reviewed the questions 1 – 4 of Practice Test 4.

Period 3b,4:
 
1.  Complete Part 2 – FRQ – Practice Test 4 – 105 Total minutes Total
 
        65 minutes left out of 105 = Continue with it tomorrow.  

 

65 minutes (25 minutes yesterday) will be completed out of 105 minutes.

 

 

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4/20 – Thursday Homework: –

 

* I am planning a review session for this Saturday – 9:00 am – 11:00 am.

PLEASE RSVP SO I CAN SEE WHO CAN ATTEND AND FIGURE OUT HOW MANY BAGELS I NEED TO FIND.

  

Period 2/3 and Period 4:
 
1. Please Complete the Practice Test – Part 1 (questions 26 – 50 ) Sprint Form B.   
It will be a timed form (40 minutes). You will be doing half the MC questions from the next test,  You will not your score back until Friday morning. 
There will be a link posted below for this form and the questions will be embedded in the form. Please have a reference table and pencil and paper to do scratch work AND A CALCULATOR!
 
 
2.  Please complete the 2021 AP Chemistry FRQ. My students took this 2 years ago. I am collecting this Friday so the more you do tonight the less you have Thursday night.  Obviously the solutions to this test are posted everywhere so I included my solutions below to help review. 
*Make note I made mistake in 1(f).  What was my error? 
 

 

3.  Review Practice test 4 FRQ with video below. You may not need a whole lot of time if understand what you did incorrectly from the scoring key that was given out.

Practice Test 4 MC review: I have given everyone access to this resource.

________________________________________________________________________                            Jump to: Friday Homework / top.   4/21 – Friday – B Day – 2, 3b/4 Lab

Main focus –                                                                                                                                                         
                                                  

    a) To review Practice Test 4 FRQ – period 4

    b) To Begin Practice Test 5 – FRQ – period 2/3

Period 2/3a:
 

1. Begin Practice Test 5 FRQ – You completed the MC part 1 sections in the last 2 nights in the Sprints.

2. Hand Out Hard copy of MC Section for review for over the weekend.

Period 4:

1. Hand Back completely graded Test

2. Statistic Review – the process works!!!

3. FRQ Review –

4. Hand Out Hard copy of MC Section for review for over the weekend.

Reminder: I will be here Saturday morning from 9:00am – 11:00am

 

_____________________

TODAY’s NOTES:  

Practice Test 4 – 2016 Released Exam Class Data: 

Practice 4 Test Data: In Class test from this week –  19 students reporting -(50 Mc questions)
mean = 56.8% ( 28.39/50 raw score)   SD = 6.93     
 
This chart is the percent correct from this class for this test:
               
 1.   84 %  16.   87 %  31.   63%  46.   53 %
 2.   90 %  17.   83 %  32.   79%  47.   42 %
 3.    81 %  18.   74 %  33.   26%  48.   67 %
 4.    90 %  19.   65 %  34.   61 %  49.   90 %
 5.    42 %  20.   57 %  35.   37 %  50.   26 %
 6.   42 %  21.   74 %  36.   53 %  
 7.    87 %  22.   61 %  37.   26 %    
 8.   84 %  23.   56 %  38.   42 %    
 9.   87 %  24.   56 %  39.   53 %    
 10.    87 %  25.   22%  40.   26 %    
 11.    52 %  26.   47 %  41.   58 %  
 12.   65 %  27.   32%  42.   42 %    
 13.   39 %  28.   79%  43.   63%    
 14.   57 %  29.   68 %  44.   79 %    
 15.   57 %  30.   84 %  45.   58 %  
 
Multiple choice comparison – AS a class we have improved!!!!
   mean     Sd  Scale
 TEst 2-  (Spring Break)   49.8 %   8.06    69 
 TEst 4 – (Finished Thursday)   56.8 %   6.93    79 – 
Class DATA For Practice Test 4 AP from our 29 AP Chemistry  STUDENTS reporting:
 AP Grade  # of students  Percent  Globally in 2016
(Mostly Juniors and Seniors!)
 5                     1                    3.4 %    9.7 %
 4                     8           27.5 %    15.1 %
 3                   14          48.3 %     27.5 %
 2                     4          13.8 %    25.3 %
 1                     2             6.9 %   22.4 %

 

Average AP Score on this test :  3.06   –  Last July : 3.53

79 % of the class scored a 3 or better.  
31 % of the class scored a 4 or 5.
 

MC score vs. AP Grade:

   1  2  3  4  5                   Total Students (29)
 41 – 50       1                                    1
 31 – 40     5 6   11
 21 – 30   1 9 2   12
 11 – 20 2 3     5
 0 – 10                                            

 

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4/21 – Weekend Homework: –

 

    I will be at the school in my room from 9:00am – 11:00am on SATURDAY APRIL 30th for AP Chemistry Review                                                                                                                                                                                                                      

1.   Review the MC Section of Practice Test 5 that you completed Thursday night.  I gave out a hard copy of that test. I have graded the Sprints and have emailed you the results. That score will be combined with your in class FRQ for a complete Practice Test 5 grade next week.  I have posted a video below reviews Practice Test 5 MC (Sprints!).  I have given everyone access. Please let me know if are having trouble connecting.

2.   Complete the 2022 FRQ (we started a couple of weeks ago when I was absent).  I am grading based on completing so you can use the available keys to help review this question set. I will be collecting this Monday!

2022 AP Chem FRQ Grodski Solutions: 

Practice Test 5 MC review: (Last 2 nights Sprints) I have given everyone access to this resource.