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   Q4 : Week 1 – 4/15 – 4/19

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_____________________________________________________                                                                  Jump toMonday Homework     4/15 – Monday – B Day – 2, 3b/4 Lab

Main focus –                                                                                                                                                         
                                                  

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

 

Period 2:  

 1. Practice Test 4 – MC – Part 1:

4th quarter Exam Grade – completing a full test for AP Grade of 1 – 5 .

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

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. 

 

Period 4:  

1. Practice Test 4 – MC – Part 1:

4th quarter Exam Grade – completing a full test for AP Grade of 1 – 5 .

75 minutes – Start and Complete Practice Test 7 – part 1 – MC – (75 MINUTES TOTAL) 
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
 
2. Enter your score in the form below 
 
3. Gain access to the Part 1 resource.   

_______________________                                                                                                                                                                              TODAY’s NOTES: 

Period 2/3: (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

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

75 minutes today 

Tomorrow: Start part 2 – FRQ of Practice Test 4

105 minutes tomorrow 

____________________________________________________                                                                         jump to:  top                          4/15 – Monday’s Homework: –

Period 2: Please Complete the spectrophotometry homework below:

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

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  – 23/24 FORM:  PERIOD 2/3 ONLY today!

Practice Test 4 MC review:

 

 

_______________________________________________________________________                                           Jump to: Tuesday Homework / top      4/16 – Tuesday – A Day – 2/3a Lab, 4

Main focus –                                                                                                                                                         
                                                  

    a) To Complete the Practice Test MC – period 2/3a

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

Period 2/3a:

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.        
 

Period 4:  

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
                                                                     

  _____________________

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    
      
                                                     

  
Practice Test 4 – MC  – 23/24 FORM:  PERIOD 2/3 ONLY today!

4/16 – Tuesday’s Homework: – 

 

 I have posted a chart below that shows the percent wrong for each multiple choice question taken from our 2 AP Classes.

Period 4: Please Complete Spectrophotometry Homework tomorrow that was posted above on Monday. You have the hard copy of the practice FRQ’s. Make sure you have reviewed every single incorrect MC question or question guessed correctly.

Period 2: 

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 (which posted below).  I have linked everyione to their private email accounts. Please contact me if you are having trouble accessing it. 

You will need to be logged into your non-school email in google to view this video. Please use the timecode under the descriptions to review with me on the video with the question you need! 

                                                                       

                                                                   Use the Time Code Link under the description to move to the question you need to review!

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

 

_____________________                                                                                                                                                                                    TODAY’s NOTES:  

2024 – Practice Test 4 –  Released Multiple ChoiceExam Class Data: 

Practice 4 Test Data: In Class test from this week –  26 students reporting -(50 Mc questions)
mean = 50.00% ( 25/50 raw score)   SD = 6.3     
 
This chart is the percent correct from period 2 and period 4 for this test:
        
 1.  77 % 16.  88 % 31.  46% 46.  46 %
 2.  73 % 17.  69 % 32.  31% 47.  35 %
 3.   77 % 18.  38 % 33.  23% 48.  65 %
 4.   85 % 19.  65 % 34.  42 % 49.  69 %
 5.   23 % 20.  38 % 35.  65 % 50.    8 %
 6.  27 % 21.  46 % 36.  31 % 
 7.   81 % 22.  42 % 37.  31 %  
 8.  85 % 23.  50 % 38.  42 %  
 9.  89 % 24.  31 % 39.  42 %  
 10.   92 % 25.  19 % 40.  27 %  
 11.   69 % 26.  35 % 41.  38 % 
 12.  89 % 27.  19 % 42.  35 %  
 13.  42 % 28.  42 % 43.  38%  
 14.  65 % 29.  31 % 44.  54 %  
 15.  54 % 30.  42 % 45.  42 % 

 

Practice Test 4 MC review:

_____________________________________________________________________________                    Jump to: Wednesday Homework / top  4/17 – Wednesday – B Day – 2, 3b/4 Lab 

Main focus –                                                                                                                                                         
                                                  

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

Period 2:
 
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.

Period 3b/4:  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. 

 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    
      
                                                     

 

4/17 – Wednesday’s Homework: – 

 

   

Period 2 and Period 3b/4: all classes 
 
1. Please Complete the Practice Test  5  – Part 1 MC (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. Please give yourself about 30 minutes of uninterrupted time BEFORE YOU START. You cannot start and stop!!!
 
There is 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!
 
2013 AP Chemistry reference tables.pdf
View Download
 
 USE YOUR Personal Email!!!!
 
 
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 4/18  – Thursday – A Day – 2/3a Lab, 4

Main focus –                                                                                                                                                         
                                                  

a) To complete Practice Test 4 FRQ – period 2/3a 

b) To give back graded Practice Test 4 – period 3 and review FRQ.

Period 2/3a:

1.  Complete Part 2 – FRQ – Practice Test 4 – 105 Total minutes Total
 
        65 minutes completed out of 105 = Continue today  

 

40 minutes (25 minutes yesterday) will be completed out of 105 minutes

2. Handout Frq scoring guideline

Lets see how much we have been reviewing as a class on the MC of Practice Test 4 :

PRACTICE TEST 4 – Part one – Multiple Choice – 

Let’s see:       In this Part 1, the class averaged 25.00 questions correct :  50 – 25.00 =  25.00 incorrect answers.

25.00 incorrect answers  x  26 students taking the practice test 7 part one =  650 total incorrect answers for ALL students.

11.6 hours watched / 650 incorrect answers0.01785 hours per question if reviewed if EVERYONE reviewed their work!!

           0.01785 x 60 minutes = 1.07 minutes per question reviewed = NOT getting it done!!!

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

 

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

 

  ___________________________________________________                                                                                          jump to:  top  4/18 – Thursday Homework: –

 

  

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 3 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 (linked everyone the video today)

    or with scoring key that was given out.

 

Practice Test 4 Free Response Review:

I will give everyone access to this resource once everyone is completed with the first test.

________________________________________________________________________                            Jump to: Friday Homework / top 4/19 – Friday – B Day – 2, 3b/4 Lab

Main focus –                                                                                                                                                         

a) To review Practice Test 4 FRQ – period 2

b) To Begin Practice Test 5 – FRQ – period 3b/4

Period 2:
 

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.

 

Period 3b/4:

1. Statistic Review – the process works!!!

2. Complete the Practice Test 4 FRQ review

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

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

 

Reminder: I will be here Saturday MAY 4th morning to give a practice test in its entirety. More Info to follow.

 

_____________________

TODAY’s NOTES:  

2024 – Practice Test 4 – 2016 Released Exam Class Data: 

Practice 4 Test Data: In Class test from this week –  26 students reporting -(50 Mc questions)
mean = 50.00% ( 25/50 raw score)   SD = 6.3     
 
This chart is the percent correct from this class for this test:
        
 1.  77 % 16.  88 % 31.  46% 46.  46 %
 2.  73 % 17.  69 % 32.  31% 47.  35 %
 3.   77 % 18.  38 % 33.  23% 48.  65 %
 4.   85 % 19.  65 % 34.  42 % 49.  69 %
 5.   23 % 20.  38 % 35.  65 % 50.    8 %
 6.  27 % 21.  46 % 36.  31 % 
 7.   81 % 22.  42 % 37.  31 %  
 8.  85 % 23.  50 % 38.  42 %  
 9.  89 % 24.  31 % 39.  42 %  
 10.   92 % 25.  19 % 40.  27 %  
 11.   69 % 26.  35 % 41.  38 % 
 12.  89 % 27.  19 % 42.  35 %  
 13.  42 % 28.  42 % 43.  38%  
 14.  65 % 29.  31 % 44.  54 %  
 15.  54 % 30.  42 % 45.  42 % 
Class DATA For Practice Test 4 AP from our 23 AP Chemistry  STUDENTS reporting:
 AP Grade # of students Percent Globally in 2016
(Mostly Juniors and Seniors!)
 5                    1                   4.3 %   9.7 %
 4                    4          17.4 %   15.1 %
 3                   5         48.3 %    27.5 %
 2                  11         21.7 %   25.3 %
 1                    2          8.7 %  22.4 %

 

Average AP Score on this test :  2.61   –  Last July : 3.53

43 % of the class scored a 3 or better.  
21.7 % of the class scored a 4 or 5.
 

MC score vs. AP Grade:

  1 2 3 4 5                  Total Students (23)
 41 – 50                                      0
 31 – 40  1113
 21 – 30 743 14
 11 – 2024  6
 0 – 10                                       

 

___________________________________________________                                                                                          jump to:  top     4/19 – SPRING BREAK Homework: –                                                                               

1.   Review the FRQ of Practice Test 4 that we completed in Class this week. Do not start any Spring Break Homework until you have completely reviewed every question that you guessed or got wrong. YOU THE RESOURCES! SO USE THEM!!!!  Both video need more views!                                                                                                  

2.   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 the week you come back.  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.

3.   Complete Practice Test 2 – I gave out hard copies for the MC and and the FRQ section of the Test as well as the AP Central Key. 

We will now use the newer AP Chemistry Reference table!
2013 AP Chemistry reference tables.pdf
View Download

 

a) Complete the MC of Practice Test 2 – GIVE YOURSELF 75 MINUTES : 1.5 MINUTES PER QUESTION

b) ENTER YOUR ANSWERS INTO THE FORM POSTED BELOW

c) Review your incorrect answers with the MC Practice Test 2 video posted below and already linked to you.

d) Complete the FRQ for the Practice Test 2.

e) Score and grade your FRQ with the AP central key given. Combine your score with the MC section using the scoring worksheet.

f) Review your FRQ of Practice Test 2 with the Video posted below and already linked to you.

g) Frolic some as it is Spring Break!

 

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

  
Practice Test 2MC Form:

Practice Test 2 MC review: I have given everyone access to this resource.

Practice Test 2 FRQ review: I have given everyone access to this resource.