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  Q1 : Week 5 – 9/28 – 10/2

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Please Make sure Your read all instructions for all assignments.    

LAB 1 -Reactivity of metals is Late!!!!!  

LAB 2 –  Voltaic Cell is Late!!!!!  

LAB 3 –  Voltaic Cell Competition is late!!!!  

LAB 4 – Electrolysis of copper (II) Chloride is DUE  9/30!

___________________________________________                                                                                            Jump to:  Monday Homework /top
9/28 – Monday – B Day – 1,2B

Main focus –
  a) To view the electrolysis of water demo and link that to Lab 3.

  b) To review the concepts of the Electrolytic cell Lab and Amperage calculations

  c) Complete Lab 4 – Electrolytic Lab 

Period 1-2:

1.  View the Electrolysis of water demo – fuel cells

a) water get oxidized

b) water gets reduced

Electrolysis of water – making the pure forms of the elements that combine to make water:

                                   2H2O (l) + 2e–   →    H2 (g)  +  2OH–                       -0.83 volts

                                            2H2O (l)   →     O2(g)  +  4H+  +  4e–              -1.23 volts

                                                                                                                                       E0 cell = -2.06 volts

—————1800————————1803————————–1831———————-–1860———–

Luigi Galvani/Alessandro Volta            Humphrey Davis           Michael Faraday’s            Mole Concept                                                                          Voltaic Pile                     electrolysis of water        Laws of electrolysis              created

                                                      ↑

                                                                                                                       The Science of Chemistry Began!

2.  Review of the Electrolytic Cell Form 2.
 
Electrolytic cell Form 2 Key – 23-24 .pdf

View Download

 

3. Lab 3 – Electrolysis of copper (II) chloride

    
    a)  Calculate the theoretical amount of copper using the graphs data
          – Should have completed this last Thursday.
    b) Measure the mass of the experimental copper obtained from filter paper that was in oven.
    c) Calculate the Percent Error.
    d) Calculate the Molarity of the solution IF WE precipitated all the copper at the cathode.
    e) Error Analysis – Conclusion analysis.
  

4.  Lab Errors – review  – Start the homework

 

                                                                                                                    

_______________________________________________________________________                                                                                                            Lab 4 – Electrolysis of copper (II) chloride
 

 LAB  4  – Determine the grams of copper collected at the cathode of an electrolytic cell of an unknown concentration of copper (II) chloride– 

a) Setup an electrolytic cell                                                                                                                        b)complete the lab diagram                                                                                                                                  c) collect and filter your copper                                                                                                                            d) place in the oven                                                                                                                                            e) Calculate the theoretical amount of grams of copper expected.                                                                          f) Determine experimental mass of copper.                                                                                                          g) Calculate percent error and Molarity of solution.

 
Lab 4 – Electrolysis of CuCl2.pdf

 

Time lapse of of aqueous Copper (II) Chloride in Lab 4  : 

Electrolytic cell Lab – 4 of review:  Error Analysis

 

__________________________________________________                                                                              Jump to:   top                  9/28 – Monday Homework: –

 

1. If you did not do the optional homework Electrolytic Calculations Practice problems that was was given out over the weekend then please complete it tonight and review the key and or video. It will review the three most common Electrolytic Cell Calculations.

*Electrolytic Calculations Practice.pdf
View Download

*Electrolytic Calculations Practice Key.pdf
View Download

2. Complete Lab 4 including the conclusion. Please view the video above to review the possible errors.               – DUE Wednesday, 9/30.

Remember your conclusion needs to     1) Describe what you accomplished based on your written objectives

                                                                                                                            2) Describe and explain fully all contributing errors that lead to your outcome.

                                                                                                                             * Do not just list errors and do not be vague!

Conclusion Basic Format:

a) What do you find ( or calculate )?                                                                                                                               Look at your objectives.  State the experimental value and percent error that was obtained.

b) What were the errors in the experiment that lead you to your outcome?                                                                  If your percent error was negative than logically explain what lead to that outcome. Do not just List the errors and do not be vague!

3. We will have a quiz that will encompass both the voltaic and electrolytic cell Tomorrow.

 I would go back and review all worksheets, keys, and videos that I posted on electrolytic cells.  In the mean time I am assigning an Extra Credit Form for tonight. I will return your graded submission and will post the key and a review video below the form.  I will also review in class Tomorrow!
 
This extra credit Form will provide EXTRA POINTS for the quiz on Friday. There will be no makeup to this quiz.  It is time to start putting this together and asking directed questions on points you do not understand. If you are sitting back and being pedestrian in this process it will not work for you. THIS EXTRA CREDIT ASSIGNMENT is very much like the quiz you will see tomorrow!
 
Please use the following worksheet posted for the EXTRA Credit form posted below:                                                               
Electrolytic cell quiz extra Credit Form 1819.pdf
View Download

 
About the Microbial Electrolytic Cell in the Form below:
Natural gas has a dominant role in our energy supply. However, most of our natural gas is of fossil origin and therefore it is of utmost importance to have a renewable source of natural gas. Currently, the only renewable alternative to natural gas of fossil origin is to produce natural gas from biomass, e.g. organic waste, and crops. This alternative is of limited use, however, as land, water, and fertilizer, needed to produce the required biomass, are scarce and its use may not compete with food production. Here we propose a new technology that is capable of converting (excess) electricity and CO₂ into methane (CH₄), the main component of natural gas. 
 
The points given back on the the electrolytic cell quiz will be determined by the following:
 
 Raw score 13 12 11 10 9 8 7 6 5 4
*Bonus Points 10 9 8 7 6 5 4 3 2 1
*So you need to get at least 4 correct answers (out of 13) to get 1 Bonus Point.  If you got 13/13 you earned the max point = 10 points.        

                                                                                                                                                                                                                   

Extra Credit Form:  IT IS NOT ON AUTO-REPLY –  You have one submission for this form and I will grade and send you your answers by 5:00 am Tuesday morning pm.  The form is due by Tuesday Morning.  I will sent out emails of your results of your submission in the early morning after 5:00 am and will post the key and a Review Video below the form.  

 

 

 

Electrolytic Extra Credit Form Review : Will be Posted after 5:00 am Tuesday Morning.

Please review your form with the following key. I will review in class.  WE WILL HAVE AN ELECTROLYTIC CELL QUIZ Tomorrow .

Electrolytic cell quiz extra Credit Form KEY 1819.pdf
View Download

________________________________________________________                                                      Jump to:  Tuesday Homework/top              9/29 – Tuesday – A Day – 1AB 

Main focus –

a) To Take an Electrolytic Cell Quiz.

Period 2, 5:

1.  Review the Extra Credit Form.

Electrolytic cell quiz extra Credit Form KEY 1819.pdf
View Download

2.  Take the Electrolytic Cell Quiz.

__________________________________________________                                                                    Jump to:   top                                          9/29 – Tuesday’s Homework: –

1. Complete Lab 4 & 5. Both are due Tomorrow, 9/30! In lab 5 we plated the copper from the key (the polarity was reversed) so based you answers about how much the mass was added to the copper strip.

2. Please use the Unit cell Tutorial that is from NORTON.  I have a link below and you will need a username and password to enter. I have provided both below. If you cannot log into the tutorial please use my video posted below that will click you for you through the presentation. Please stop the video when needed. 

 
 The questions that the presents are written for you in the following worksheet.
 
Lattice Arrangement – Cubic cells.pdf  (this is a hard copy of the form which was given out today)
View Download                                                                                                                                                                                         
Click on the link and click on the UNIT Cell Tutorial. Please Use FIREFOX or Chrome. Safari may have issues!  (The link below worked for me today in Chrome without a login.)                                                                        
 
You might need the login:
username: grodskib@whbschools.org
password: Lexington1                                                                                                                                                                                                   
If you cannot access the clickable presentation please view the video I made of me going through the presentation.
I posted it below.                                                                                                                                                                                           
3. Please complete the form below based on the UNIT Cell Tutorial in step 1.
      You will have 3 submissions.
 
Please use the video (Flash animation turned into a video ) to complete the Lattice Energy Form if you could not connect to the tutorial above:
 
                                                                                                             

 

1) Electrolytic cell Lab – 3 of review:  Error Analysis

 

2) Flash animation turned into a video :

Please use this video to complete the Lattice Energy Form if you could not connect with the Link:

3)  Form on the Flash animation turned to video: You have 3 submissions for this form.

      ________________________________________________                                                    Jump to:  Wednesday Homework/top
9/30 – Wednesday – B Day – 1,2B

 
Main focus –
a) To identify types of unit cells in Ionic and Metallic crystals (solids)                                                                                                                                                   

b) To perform unit cell calculations to determine, density, lattice constant, atomic mass, and atomic radius.                                                                                                                                                                                                               

https://openstax.org/books/chemistry-2e/pages/10-6-lattice-structures-in-crystalline-solids

Period 1-2, 5-6: Collect Lab 4 & 5

1. Give back Electrolytic Quizzes – Might have to wait till everyone completes it.

Extra Credit Electrolytic Form Scale:

18      17     16     15     14     13     12     11     10      9      8  –  0         =      Raw Score

10       9        8       8       7        6      5        4       3       2          1            =      Extra points

 
2. Ionic and metallic crystal lattice lesson – 
   X-ray crystallography – diffraction demo 
   cubic cell – video below

 

Diffraction of light demo – double slit experiment = green laser 

Constructive and destructive interference patterns
These patterns can be observed to measure the distance of the 2 slits or the distance between openings in a crystal. 
 

 The following is an example of an interference pattern or a diffraction pattern that occurred during today’s demo.  This is the famous double slit experiment that proves light has wave properties.

I pointed a green laser at a card that had 2 small double slits.

The bright spots are the constructive interference while the space between the dots are destructive interference.  Based on some measured values and Bragg’s Law we can calculate the distance between the slits that the light passed through AND this is what is done to measure the distance of the lattice constant from metal crystals in x-ray crystallography. 

green laser
Passivity connections
Alloy – stainless steel
 
3:  Start the classwork worksheet – Calculations of Close Cubic Packing Structures.pdf
 
Classwork:
Calculations of Close Cubic Packing Structures.pdf
View Download
 
Calculation with Close Packing structures Key p.pdf
View Download

 

4:  Lab

– Complete any calculations to Lab 5 – Electroplating the brass key – Hand in

– Thickness of Metals Lab 6 – (conversions, mole concept, Lattice calculations)

– instructions

– measurements of the 2 foil

‘ 

______________________________
Lab 6 – Thickness of Metal Foil Lab

 

LAB  6  – The Metal Foil lab – Determine the number of atoms high a copper foil and aluminum foil are using volume, density and unit cell calculations.

Objectives:

1. Calculate the Thickness of an aluminum and copper foil (thin piece of metal).

2.  Determine the number of atoms high a copper foil and aluminum foil are using volume, density and unit cell calculations.

The metal foil lab activity is not a formal writeup but please complete it as per the procedure in the handout that I gave.  A piece of paper with your work neatly written with units and sig figs showing all calculations will suffice.

Discussed the volume unit relatives cm3 = ml and the conversions of m3 to cm3metric prefixes:   

K H D [   ] d c m  —–>  micro, nano, pico

Conversion large number = small unit —–> small number = large unit
 
Lab 6- thickness of foils – 2025.pdf
View Download
  

Thin Foil Lab Instructions:

 

 

Unit cell for class:  

Presentation for Class and Lab 4: 

Today’s Lesson:  

_____________________________________________________                                                                                                               jump to:  top
9/30 – Wednesday’s Homework: – 

1. Make another submission to the Last Nights Form if need be AFTER you have completed the selected questions below:

2. Please complete question 1 on the Crystalline Unit Cell Problems.pdf  by following along with me in the video below. Only do question 1 on this worksheet.  

 
Crystalline Unit Cell Problems.pdf
View Download
 
Crystalline unit cell problems key p.pdf
View Download
 
3.  Please complete question 1 (if we did not complete in class today) and 2 from the Calculations of Close Cubic Packing Structures.pdf worksheet and review with the key. 
 
Calculations of Close Cubic Packing Structures.pdf
 
Calculation with Close Packing structures Key p.pdf
View Download                                                                                                   

 

2) Crystalline Unit Cell problems HW video.

 

Electrolysis of quiz review:  

Electrolytic cell quiz key p.pdf                                                                                                                   View Download 

 ___________________________________________                                                                                 Jump to:  Thursday Homework / top
10/1 – Thursday – A Day – 1AB 

Main focus –   

a) To identify types of unit cells in Ionic and Metallic crystals (solids)                                                                                                                                                   

b) To perform unit cell calculations to determine, density, lattice constant, atomic           mass, and atomic radius. 

c) To identify substitutional and interstitial alloys. 

1. Complete/Review classwork problems – Question 1 and 2 : Solving for Density –                                                                                                                  

Calculations of Close Cubic Packing Structures.pdf
View Download
 
Calculation with Close Packing structures Key p.pdf
View Download                                                                                                                                                                                         

2. Classwork: –  2 new problems today

a) solve for the atomic radius with trigonometry or pathagorean theorem

b) solve for the gram atomic mass ( mass of 1 mole of the element in the metallic crystal lattice.

Question 1 and 2 of Unit Cell Practice Problems: 

Unit Cell Practice Problems.pdf
View Download   

Unit Cell Practice Problems Key.pdf
View Download  

 

_________________________________________________                                                                          Jump to:   top                                    10/1 – Thursday Homework: –

MAKE SURE YOU REFRESH THIS PAGE AS THIS HOMEWORK IS SUBJECT TO CHANGE BASED ON HOW FAR WE GET IN CLASS TODAY.

Basically you are

1. looking at the key for todays’s classwork or my NEW video posted below to refresh how solve for atomic radius.

2. Completing a problem just like it with video or key.

3. Viewing the video at question 3 to show you a new problem.

4. Doing that new problem on your own (opposite side) and review it with a key.

1. Please view the key to today’s classwork problem, where we did complete the problem of solving the atomic radius of silver in problem 1. You could also view today’s lesson video below:

Unit Cell Practice Problems Key.pdf
View Download   

2. Please complete questions 2, in the Crystalline Unit Cell Problems.pdf 

This is the same type of problem we almost completed in class today. You can try it and view the key OR you can do it with me using the video below that starts at question 2.

*Be for-warned that in my video FOR QUESTION 2, I did not have my calculator in degrees so my final answer to 2 is a bit off because I have the sin 45 to be .8509 when it should be .707.  The handwritten key is correct. IN spite of me you can learn!
 
My key below is correct for question 2.

                                                                                                                                                                                       Crystalline Unit Cell Problems.pdf
View Download

 Crystalline unit cell problems key p.pdf

                             

3. Please view the lecture below starting at question 3 ( 24:52 of the video posted below) and complete question 3 (of the same worksheet you just completed in step 2 above. This question asks you to solve for the atomic mass or the mass per 1 mole of an unknown element and then identify it based on the periodic table.

4. On the back side of today’s classwork complete question 2.  Its like the question that was just modeled for you in the video in step 3. Please view the key below to review it.

Unit Cell Practice Problems Key.pdf
View Download 

 

                                                                                        

1)  Unit Cell Practice Problems –  Solve for atomic Radius – Question 1. Today’s Lesson!

 

2)  Crystalline Unit Cell problems HW video : This will start at question 2!

 

 

3)  Crystalline Unit Cell problems HW video : This will start at question 3!

 

   _______________________________________                                                                                      Jump to:  Friday Homework / top    10/2 – Friday – B Day – 1,2B

Main focus –

a) To complete Unit cell calculations: Density, atomic radius, and atomic mass
     
c)  To continue with lab 4  – mole and unit cell calculations

Textbook: 10.6  – Lattice Structures

Metric Conversions you need to know:

1 x 1012 picometers = 1 meter

1 x 109 nanometers = 1 meter

Period 1-2:

1. Unit Cell Homework review – Question 2 & 3  

Crystalline unit cell problems key p.pdf
View Download 

2. Unit Cell  – Determine the atomic mass of the unknown – Question 2 Thursday’s classwork

Unit Cell Practice Problems Key.pdf
View Download  

3.  Lab 6 – Metal Foil Lab –  complete the lab!

Alloy Presentation for class lesson:  

______________________________
Lab 6 – Thickness of Metal Foil Lab

 

LAB  6  – The Metal Foil lab – Determine the number of atoms high a copper foil and aluminum foil are using volume, density and unit cell calculations.

Objectives:

1. Calculate the Thickness of an aluminum and copper foil (thin piece of metal).

2.  Determine the number of atoms high a copper foil and aluminum foil are using volume, density and unit cell calculations.

The metal foil lab activity is not a formal writeup but please complete it as per the procedure in the handout that I gave.  A piece of paper with your work neatly written with units and sig figs showing all calculations will suffice.

Discussed the volume unit relatives cm3 = ml and the conversions of m3 to cm3metric prefixes:   

K H D [   ] d c m  —–>  micro, nano, pico

Conversion large number = small unit —–> small number = large unit
 
Lab 6- thickness of foils – 2025.pdf
View Download
  

Thin Foil Lab Instructions:

 

 

1: Thin Foil Lab measurement : If you still to measure the mass or dimensions of Al or Cu please use this video to grab those measurements

 

_______________________________________________________                                                                   Jump to:   top                        10/2 – Weekend Homework: –

1.  Complete Lab 6 calculations and conclusion page. You may have finished in class.  Due Monday 10/5.
 
2.  Complete 2 problems – Unit cell Calculations Practice II.pdf: Complete and Review with the key.
 
Unit Cell Practice Problems II.pdf

Unit Cell Practice Problems II Key.pdf                                                                                                                     View Download

  
3. Study for TEST 1 – Tuesday –  10/6
 
Test 1 topics:  – 
Please go back the appropriate worksheets, keys,and lectures in the past 3 weeks to review the following concepts
 
   1.  Coulombs Law:  
 
No calculations with the formula but you should be aware how it applies to atoms ability to oxidize or reduce, solubility (why some ionic solids will dissolve in water while others do not or precipitate).
 
   2.  Voltaic Cell/galvanic cell 
 Diagram, determining anode, cathode, charges, flow of electrons, salt bridge flow of ions, E0 calculation, use of reduction potential table,  writing balanced half reactions and overall reactions, predicting the voltage change when concentrations change (Le Chateliers Principle), molarity (M), predicting precipitates that would lower the molarity of certain ions when they become solids, voltage vs current.  Spontaneity and equilibrium, The U diagram.
 
   3.  Electrolytic Cell –
 Diagram and label all parts with flow of charge from a power source.  Predict the products at each anode.   Calculating the moles, molarity, or grams of the products using total time, amperage and Faradays constant.
Determining E0 cell, half reactions, overall reaction, spontaneity.
 
 Example 17.9 in Textbook gives 2 more problems with solutions
 

Electrolysis quiz Review Video is posted below:

 

   4.  Unit Cell and alloys

Textbook: 10.6  – Lattice Structures

Basics of interstitial and substitutional alloys,  calculations using density, lattice constant and atomic radii with FCC or BCC.  Conversions, and use of Avogadros number.

 
There is no need to memorize the conversion factors (pm, nm) but you need to know what the FCC or BCC looks like and you should be able to figure out how many atom exist in each FCC or BCC. You should be able to complete all conversions of all the worksheet and Lab (4). 
 
 Example 10.15 in Textbook gives 4 more problems with solutions
 
 
Calculations of Close Cubic Packing Structures.pdf
View Download
 
Calculation with Close Packing structures Key p.pdf
View Download
 
Crystalline Unit Cell Problems.pdf
View Download
 

Crystalline unit cell problems key p.pdf
View Download

 
Unit Cell Practice Problems.pdf
View Download 
 
Unit Cell Practice Problems Key.pdf
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Here is a Link to Purdue University’s resources on Unit cell calculations: 
 
    5.  Review your 2 graded quizzes.  I have posted some blank quizzes.  *If you cannot print from your school computer, use your phone or another computer.
 
 Blank Quiz Quiz Key
Voltaic Cell quiz 1.pdf
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Voltaic Cell Quiz 2 – 22-23.pdf
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Voltaic Cell Quiz 2 – 22-23 KEY.pdf
Electrolytic cell quiz .pdf
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Electrolytic cell quiz key p.pdf

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