Q1 : Week 6 – 10/3 – 10/7
Jump to: Tuesday, Wednesday, Thursday, Friday
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If you have not already please join the REMIND for this class.
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10/3 – Monday – B Day – 2, 3b/4 Lab Jump to: Monday Homework Main focus–
b) To perform unit cell calculations to determine, density, lattice constant, atomic mass, and atomic radius.
c) To identify substitutional and interstitial alloys.
Electrolytic cell quiz extra Credit Form KEY 1819.pdf
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2. Complete/Review classwork problems – Question 2 and 3 for both periods 2 , 4
3. Alloy lesson – How adding different metals into a metal crystal will change the metals properties
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:
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
Presentation for Class and Lab 4:
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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.
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Crystalline unit cell problems key p.pdf
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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.
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10/4 – Tuesday – A Day – 2, 3a Lab/4
Crystalline unit cell problems key p.pdf
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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
Thin Foil Lab Instructions:
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10/4 – Tuesday’s Homework: –
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| Blank Quiz | Quiz Key |
| 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
|
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10/5 – Wednesday – Yom Kippur
Jump to: Thursday Homework
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10/6 – Thursday – B Day – 2, 3b/4 Lab
b) To Complete Lab 4 – mole and unit cell calculations – conclusion questions – 3b/4
Period 3b –
2. Lab 4 Continues –
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
Thin Foil Lab Instructions:
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10/6 – Thursday Homework: –
1: Re-Study for TEST 1 –
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!)
Review of Test 1:
1: MIT Video :
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.
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10/7 – Friday – A Day – 2/3a Lab, 4 Jump to: Friday Homework
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)
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:
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10/7 – Friday’s Homework: –
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 :
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.