Archive – AP Chem – Q1 – week 5 – 21-22

Week 5 – 9/27 – 10/1

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9/27 – Monday – B Day – 2, 3b/4 Lab

Main focus –

a) To discuss the last implication of the Fe+3 and OH- in the reduction cell in Lab 2.

b) Review Electrolytic cell calculations.

c) Perform an electrolytic cell Lab by determining the mass of Cu at the cathode.

1. Review the Homework:

Electrolytic cell – Molarity calculations Key p .pdf

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Intro Electrolytic Cells worksheet 2 key p.pdf
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2. Complete the classwork: (back side of the previous homework worksheet)

Stiochiometry 8 redox electrolytic – 1999.pdf

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Stiochiometry 8 redox electrolytic KEY – 1999.pdf
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3b/4 Lab –

LAB 3 – Determine the grams of copper collected at the cathode of an electrolytic cell of an unknown concentration of copper (II) chloride–

Setup an electrolytic cell complete the lab diagram collect and filter your copper place in the oven

Lab 3 – Electrolysis of CuCl2.pdf

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9/27 – Monday Homework: –

1. Please view the Electrolysis of water demo to understand how water can be oxidized and

reduced in water:

2. Complete and review the following worksheet with the key and/or Video below:

Electrolytic Problems Expanded.pdf
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Electrolytic Problems Expanded key p.pdf
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3. Start reviewing your electrolytic cell worksheets. A quiz is coming soon!

Electrolysis of water review video :

Electrolytic Problems Expanded Review video:

End of Monday!

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9/28 – Tuesday – B Day – 2/3a, 4 single

Main focus –

a) To connect the concepts of electrolytic calculations with Lab 3 by determining the experimental mass of the Cu and comparing that result with the stoichiometric calculation.

b) Calculate the Molarity of the solution

1: Lab 3 : Determining the grams of copper from electrolysis –

Measure the mass of your filter paper and Copper – Data Collection

Calculate grams of experimental copper. Calculate the Theoretical grams of copper deposited at the cathode. Calculate the Molarity of the solution assuming a 100.0 ml volume of solution was given.

Calculate percent Error.

2. Review of Homework worksheets: Implications of electrolysis of water in Lab 3..

Intro Electrolytic Cells worksheet 2 key p.pdf
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Electrolytic cell – Molarity calculations Key p .pdf
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Electrolytic Problems Expanded key p.pdf
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Links to my demos explained:

Electroplating demo:

Electrolysis of KI demo:

Electrolysis of water:

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9/28 – Tuesday Homework: –

1. We will have a quiz that will encompass both the voltaic and electrolytic cell tomorrow.

Tonight you will take an extra credit Form that will provide EXTRA POINTS for the quiz.

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.

Please use the following worksheet posted for the EXTRA Credit form posted below:

Electrolytic cell quiz extra Credit Form 1819.pdf
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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 last electrolytic cell quiz will be determined 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 tomorrow morning.

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End Of Tuesday!

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9/29 – Wednesday – B Day – 2, 3b/4 single

Main focus –

a) To connect the concepts of electrolytic calculations with Lab 3 by determining the experimental mass of the Cu and comparing that result with the stoichiometric calculation.

b) Calculate the Molarity of the solution

1: Lab 3 : Determining the grams of copper from electrolysis –

Measure the mass of your filter paper and Copper – Data Collection

Calculate grams of experimental copper. Calculate the Theoretical grams of copper deposited at the cathode. Calculate the Molarity of the solution assuming a 100.0 ml volume of solution was given.

Calculate percent Error.

2. Review of Electrolytic Cell Extra Credit Quiz

3. Electrolytic Cell Quiz in class

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9/29 – Wednesday Homework: –

1. Please review the electrolytic cell quiz with the class lecture below:

2. Please watch the flash animation from the Link Below (UNIT CELL TUTORIAL) and do the questions at the end of the tutorial. (they provide answers and solutions). This tutorial will be very helpful for tomorrow’s Lab activity.

Lattice Arrangement – Cubic cells.pdf (this is a hard copy of the form which was given out today)
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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 without a login.

Link:

You might need the login:

grodskib@whbschools.org

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 this video to complete the Lattice Energy Form if you could not connect to the tutorial above:

1:Electrolysis of quiz review:

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 submission3 for this form.

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End of Wednesday!

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9/30 – Thursday – A Day – 2/3a, 4

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.

1. Electrolytic Quiz- Review video posted, Give back quizzes – period 2/3 only

2. Ionic and metallic crystal lattice lesson – began with this for period 4

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 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
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Calculation with Close Packing structures Key p.pdf
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Unit cell for class:

Presentation for Class and Lab 4:

2/3a 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
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Today’s Lesson:

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9/30 – Thursday Homework: –

1: Please make another submission to last nights form. (You can have 3 more submissions!!)

2: Please complete the front page of the Crystalline Unit Cell Problems.pdf and review with the key.

I have posted a video below on this worksheet if needed.

*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
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Crystalline unit cell problems key p.pdf
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2: Crystalline Unit Cell problems HW video :

End of Thursday.

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10/1 – Friday – B Day – 2, 3b/4

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. Electrolytic Quiz- Review video posted, Give back quizzes – period 3/4 only

2. Complete/Review classwork problems – Question 3 for period 3/4

Classwork:

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

4. Thin Foil lab – start with period 2 and period 4

Alloy Presentation for class lesson:

Presentation for Class and Lab 4:

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.

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

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10/1 – Friday Homework: –

1: Please complete the back page of the Crystalline Unit Cell Problems.pdf and review with the key.

I have posted the review video above under Thursday’s homework.

Crystalline Unit Cell Problems.pdf
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Crystalline unit cell problems key p.pdf
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2: Please complete the Conclusion of lab 3 – (electrolytic cell) and hand in Monday.

3: Please complete the Alloy worksheet.pdf worksheet and review with the key.

Alloy worksheet.pdf
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Alloy worksheet key.pdf

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4: Study for TEST 1 – Later next week – I want to complete Lab 4 first.

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) or what the FCC or BCC looks like but 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).

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 ViewDownload	Voltaic Cell Quiz retake key p.pdf ViewDownload
Electrolytic cell quiz .pdf View Download	Electrolytic cell quiz key p.pdf ViewDownload

End of week 5!