Select Page

  Q1 : Week 6  – 10/3 – 10/7

                                                                                                                                                                                  Jump to Tuesday, Wednesday, Thursday, Friday 

Refresh this page every time you arrive!

If you have not already please join the REMIND for this class.                                                                                                                                                                                                                             
________________________________________________________________________________
 10/3 – Monday – B Day – 2, 3b/4 Lab                               Jump toMonday Homework 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.                                                                                                                                                                                                       

Period 2 ,4 – 
 
1. Electrolytic Quiz-  Review  – period 3/4 only

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

2. Complete/Review classwork problems – Question 2 and 3 for both periods 2 , 4                                                                                                                       

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

3.  Alloy lesson – How adding different metals into a metal crystal will change the metals properties 

       Examples:  Steel, Stainless Steel (Cr prevents the oxidation of Fe )

       Keep Galvanic Corrosion for the second day.. (get to the Alloys!)

                                                                                                                                                                                                            4. Thin Foil lab – start with period 1 and period 4 

Period 3b – 

1. Lab 4 : Metal Foil Lab

 

Unit cell for class:  

Alloy Presentation for class lesson:  

 
3b/4 Lab –  

 

LAB  4  The Metal Foil lab – 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 4- thickness of foils – 2017.pdf
View Download
 

 

Presentation for Class and Lab 4: 

__________________________________________________

10/2 – Monday’s Homework: –

 

1:  Please view the lecture (first 23 minutes only) and complete the Alloy worksheet.pdf worksheet and review with the key. Period 3b/4 class today does not need to view this lecture as I was able to complete the alloy lecture in class.

 
Alloy worksheet.pdf
View Download

Alloy worksheet key.pdf                                                                                                                                           View Download

 

2:  Please complete the back page of the Crystalline Unit Cell Problems.pdf and review with the key. 
I have posted the review video below.  You should already have this worksheet as the first page was the homework this weekend.
 
Crystalline Unit Cell Problems.pdf
View Download
 

Crystalline unit cell problems key p.pdf
View Download

                                                                                                                                                                                                                                                                                                                                                                

1: Alloy introduction video : Stop at  23:00 (alloy lecture part)

 

 

2: Crystalline Unit Cell problems HW video : Start at  24:53 to review backside.

 

 

  ________________________________________________________________                                                         Jump toTuesday Homework

10/4 – Tuesday – A Day – 2, 3a Lab/4                                             

Main focus 
     a) To identify galvanic corrosion and review alloys
     
     b)  Begin lab 4  – mole and unit cell calculations

                                                                                                                                                                               

1: alloys/ Galvanic Corrosion/ 
2. Alloy Review, Homework review, calculation of atomic mass (grams per mole)!
3. Lab 4 (all classes)
 
Homework:
Alloy worksheet key.pdf                                                                                                                            View Download 
 

Crystalline unit cell problems key p.pdf
View Download 

                                                                                                                   

_______________________ 
Lab 4 – The Metal Foil Lab

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 4- thickness of foils – 2017.pdf
View Download
  

Thin Foil Lab Instructions:

_____________________________________________________

10/4 – Tuesday’s Homework: –

 
Study for TEST 1 – Thursday. 10/5
 
Test 1 topics:  – 
Please go back the appropriate worksheets, keys,and lectures in the past 3 weeks to review the following concepts
 
1.  Coloumbs 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,
 
4:  Unit Cell and alloys
 
Basics of interstitial and substitutional alloys,  calculations using density, lattice constant and atomic radii with FCC or BCC.  Conversions, and use of Avogodros 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). 
 
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
 
Here is a Link to Purdue University’s resources on Unit cell calculations: 
 
5.  Review your 2 graded quizzes. They keys are posted in the powerschool. 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 .pdf
View Download
Voltaic Cell Quiz Key p.pdf
View Download
Voltaic Cell Quiz retake.pdf
View Download 
Voltaic Cell Quiz retake key p.pdf
View Download 
Electrolytic cell quiz .pdf
View Download      
Electrolytic cell quiz key p.pdf

  View Download

                                 

                                                                                                                                                                                                                            
________________________________________________________________________________
 10/5 – Wednesday – Yom Kippur              

 

 

 

                                                                                                                                                                                                                                                           Jump toThursday Homework
_______________________________________________________________________________________________________________________________________

10/6 – Thursday – B Day – 2, 3b/4 Lab                             

Main focus –                                                                                                                                                         
     a)  Test 1 – Voltaic/Electrolytic Cells/Cubic cell calculations/alloys

                                                                                                                                                                   

    b) To Complete Lab 4  – mole and unit cell calculations – conclusion questions – 3b/4

                                                                                                                                            

Period 2 ,4 – 
 
1. TEST 1 – Voltaic cell / Electrolytic Cell / Unit Cell Calculationsperiod 2/4

Period 3b –  

2. Lab 4 Continues –                                                                                                                       

               

                                                                                                    

_______________________ 
Lab 4 – The Metal Foil Lab

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 4- thickness of foils – 2017.pdf
View Download
  

Thin Foil Lab Instructions:

______________________

10/6 – Thursday Homework: – 

 

1:  Re-Study for TEST 1 –    

      I will grade, scan and email you your first attempt on this test by this afternoon. I will have the key linked in              Powerschool.  I will also unlock the video below so that you can review the test.     
         
blank test: https://drive.google.com/file/d/1m7ZaFoLsS1NPYtm01CzehfU1abCimOSy/view?usp=sharing                                                                                                                                                                                              
 
2:  Mole Concept/particle theory Officially begins: – Due Tuesday 10/11
 
We have used mole concept and particle theory in our Amperage/Faraday calculations and in out unit cell calculations BUT we need to formally review and solidify these concepts to begin the Analytical/Stiochiometry part of the course.                                                                                                                                                           
        A) Please view the lecture from MIT (Massachusetts Institute of Technology)
 

        B) Please fill the form below based on the lecture:   

3.  Complete the form below using the VERY Cool Mole videos below: Due Tuesday 10/11

( 2 submissions only!)

       
       Click on the upper left corner graphic that has the arrow to select the video you need.

Review of Test 1:

1: MIT Video

 
2: MIT lecture Form: 

 

 

3: Mole Concept video playlist for form below

Click on the upper left corner graphic that has the arrow to select the video you need.

3: Mole Concept Form: Based on above videos..
*Check the Key for next year for questions 8 and 12!


 

._______________________________________________________________________________________________________________________________

10/7 – Friday – A Day – 2/3a Lab, 4                                     Jump toFriday Homework

Main focus 
    a)  To Complete Lab 4  – mole and unit cell calculations – conclusion questions – 3b/4

                                                                                                                                                              

    b)  Test 1 (second version)- Voltaic/Electrolytic Cells/Cubic cell calculations/alloys

Period 2 :

a) Lab 4 – Metal Foils Lab continues..  

                                

Period 3/4

 a) Test 1 – Version 2

 b) Mole concept and particle theory begins in class 1 –

1) Return of  Thursday’s’Form – Scientists – MIT Lecture                                                                                                                                                    2) Seeing atoms – Scanning Tunneling Electron Microscopy – (pizo electric crystal)

The need for a particle theory and mole theory.  They are deeply intertwined.
   

Richard Feynman said in Volume One of his Lectures on Physics:

If, in some cataclysm, all of scientific knowledge were to be destroyed, and only one sentence passed on to the next generation of creatures, what statement would contain the most information in the fewest words? I believe it is the atomic hypothesis that all things are made of atoms — little particles that move around in perpetual motion, attracting each other when they are a little distance apart, but repelling upon being squeezed into one another.

Particle / Mole Theory Presentation:

 __________________________________________________

10/7 – Friday’s Homework: –

1:  Mole Concept/particle theory Officially begins: – Due Tuesday 10/11
 
We have used mole concept and particle theory in our Amperage/Faraday calculations and in out unit cell calculations BUT we need to formally review and solidify these concepts to begin the Analytical/Stiochiometry part of the course.                                                                                                                                                           
        A) Please view the lecture from MIT (Massachusetts Institute of Technology)
 

        B) Please fill the form below based on the lecture:   

2.  Complete the form below using the VERY Cool Mole videos below: Due Tuesday 10/11

( 2 submissions only!)

                                                               

3.  Re-write conclusions for Lab 1 and or Lab 3.

I handed back Lab 1 (graded) and Lab 3 (non-graded) to you in class today.  IF YOU LOST POINTS ON YOUR CONCLUSION you may re-write it.  Type and print it and staple it to your existing labs.  Please use my comments on your graded lab 1 as your guide.  If you think lab 3 conclusion needs to be edited please REDO Lab 3 or look it over based on how I graded lab 1. Some of you are new to me in how I grade labs, especially Lab Conclusions.

Basic Lab Conclusion Guidelines:

The first paragraph – (Analysis of your objectives) – or section of your lab must parallel with your objectives.  In your objectives you told me what you were going to accomplish and now you must tell me what you actually found.  If you set out to do something and did not then points will be lost.  In this section you must write what you did according to your objectives. For instance in the 1st lab, we determined the experimental voltage of the Gerber cell and determines the accuracy of your results (percent error).   I want you to write what you obtained for these 2 objectives.  DO NOT WRITE A PROCEDURE ON HOW YOU DID THIS! This really a results section which summarizing the most pertinent data that you collected.  This is half of your conclusion.

In the second paragraph – (Error analysis) – of the conclusion, you must evaluate your experimental data through error analysis.  This requires thought and logical comments that supports your outcomes.  In the first lab you have a LARGE negative percent error and thus you need to list and explain errors that caused your experimental value to be under the theoretical value.   In this section you will use your numbers obtained experimentally to be your guide. You will describe all errors and tie them to your results. YOU NEED TO EXPLAIN HOW YOUR MEASURED VALUES ACTUALLY LED TO a lower value than the standard as was the case in Lab 1.  Be logical and concise.  You will only lose points if your explanation is not logical or if YOU ARE VAGUE!!!  This is analytical writing and thus no statements like, “I feel” or “I believe” should be used.    

                                                                                                                                                                                                                                                                                          

1: MIT Video

 
2: MIT lecture Form: 

 

 

3: Mole Concept video playlist for form below

Click on the upper left corner graphic that has the arrow to select the video you need.

3: Mole Concept Form: Based on above videos..
*Check the Key for next year for questions 8 and 12!