Q1 : Week 3 – 9/13 – 9/17
. Jump to: Tuesday, Wednesday, Thursday, Friday
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9/12 – Monday – A Day – 2/3a Lab, 4 single – Jump to: Monday Homework
a) To identify the voltage change in a voltaic cell due to Le Chatelier’s Principle with changes in the concentrations of ions in half cells, specifically when a precipitate is made or a common ion is added.
2. Review of the AP problem that was also assigned this weekend.
Intro Voltaic Cells Worksheet 1 key pp.pdf
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In question 2 my key does not do a great job in answering some questions..
2a) overall reaction with the greatest voltage:
2Al (s) → 2Al+3 (aq) + 3e- 6e- +1.66 volts
3Cu+2 + 2e– 6e- → 3Cu (s) +0.34 Volts _______________________________________________
2Al (s) + 3Cu+2 → 2Al+3 (aq) + 3Cu (s) E0 cell = 2.00 volts
2d) Explain why each salt (ionic compound) is not appropriate:
NaOH –> Although OH– is soluble and thus produces free ions that will “maintain electrical neutrality” it will cause a precipitate with the Cu+2 ion in the reduction cell that will lower the reactants causing a shift to the left that would lower the voltage due to Le Chatelier’s Principle
CuS —> This salt is not soluble (large positive and large negative charges) thus their would be NO FREE IONS “to maintain electrical neutrality” and thus this choice of salt in the salt bridge would cause the voltage to remain at zero!
NaNO3 —-> This salt is soluble and thus will produce free ions “to maintain electrical neutrality” and will facilitate a positive voltage. This salt was weak coulombic attractions due to each of the ions having a low charge density.
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Daniell Cell – Le Chateliers Demo: Today’s demo.
– At 0:35 I add water to dilute the Cu+2 into the reduction half cell.
– At 1:33 of the video I add Na2CO3 (s) into the oxidation half cell.
– At 0:35 I add water to dilute the Cu+2 :
a) Made one voltaic cell and identifies anode, cathode and tested voltage.
 
My video below illustrates the reaction occurring above (the fizzing or production of hydrogen gas).
Lab 1 fun:
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9/12 – Monday Homework: –
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9/13 – Tuesday – B Day – 3b Lab, 4 single Jump to: Tuesday Homework
Main focus –
a). To identify the voltage change in a voltaic cell due to Le Chatelier’s Principle with changes in the concentrations of ions in half cells, specifically in a concentration cell
b) To reinforce the concepts of the voltaic / galvanic cell by taking a 15 minute 1 page quiz.
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Today’s Demo – What if I create voltaic cell with the same electrodes (Cu) and the same concentration of Copper ions?
Today’s lesson on the concentration cell:.
a) Made one voltaic cell and identifies anode, cathode and tested voltage.
 
Gerber Voltaic Cell Time Lapse: I use this to review conclusion questions.
Review of the Voltaic cell quiz given Today: I will open this video after both classes finish the quiz today.
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9/13 – Tuesday Homework:
1. Please review the graded quiz that will be emailed back to you sometime today. A blank copy and the key will be posted below as well as a complete review video which is posted above.. You have another quiz Wedenseday which will be the best out of 2!
Today’s Quiz Key will be posted here after period 3:
View Download
Voltaic Cell quiz 1 key.pdf View Download
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Conclusion Writing:
..Walking down 29th and Park
He said something to make you laugh
I saw that both your smiles were twice as wide as ours
Yeah, you look happier, you do
But ain’t nobody love you like I do
Promise that I will not take it personal, baby
If you’re moving on with someone new
My friends told me one day I’ll feel it too
And until then I’ll smile to hide the truth
But I know I was happier with you
Sat on the corner of the room
Everything’s reminding me of you
Nursing an empty bottle and telling myself you’re happier…Blah Blah
Jump to: Wednesday Homework ________________________________________________________________________________
9/14 – Wednesday – A Day – 2/3a Lab, 4 single –
Main focus –
Recent Voltaic Cell AP Test Questions key p.pdf
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2. Take the second voltaic quiz – Best out of 2!
3. Lab 1 – Conclusion questions/ Conclusion writing / Error Analysis
a) Made one voltaic cell and identifies anode, cathode and tested voltage.
 
Gerber Voltaic Cell Time Lapse: I use this to review conclusion questions.
Review of the Lab 1 that might help with conclusion:
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9/14 – Wednesday Homework: –
3. Complete the form below on battery in your car (lead acid) UNLESS

How It Works
Let me give you the big picture first for those who aren’t very detail oriented. Basically, when a battery is being discharged, the sulfuric acid in the electrolyte is being depleted so that the electrolyte more closely resembles water. At the same time, sulfate from the acid is coating the plates and reducing the surface area over which the chemical reaction can take place. Charging reverses the process, driving the sulfate back into the acid. That’s it in a nutshell, but read on for a better understanding. If you’ve already run from the room screaming and pulling your hair, don’t worry.
The electrolyte (sulfuric acid and water) contains charged ions of sulfate and hydrogen. The sulfate ions are negatively charged, and the hydrogen ions have a positive charge. Here’s what happens when you turn on a load (headlight, starter, etc). The sulfate ions move to the negative plates and give up their negative charge. The remaining sulfate combines with the active material on the plates to form lead sulfate. This reduces the strength of the electrolyte, and the sulfate on the plates acts as an electrical insulator. The excess electrons flow out the negative side of the battery, through the electrical device, and back to the positive side of the battery. At the positive battery terminal, the electrons rush back in and are accepted by the positive plates. The oxygen in the active material (lead dioxide) reacts with the hydrogen ions to form water, and the lead reacts with the sulfuric acid to form lead sulfate.
The ions moving around in the electrolyte are what create the current flow, but as the cell becomes discharged, the number of ions in the electrolyte decreases and the area of active material available to accept them also decreases because it’s becoming coated with sulfate. Remember, the chemical reaction takes place in the pores on the active material that’s bonded to the plates.
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Lead Acid Battery Presentation :
Lead Acid Battery Animation :
Lead Acid Battery Tutorial :
Jump to: Thursday Homework
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9/15 – Thursday – B Day – 3b Lab, 4 single

2. Review the Alkaline battery – we did not get to this!!
LAB Activity 2 – design a voltaic cell with greatest voltage– modest breakfast up for grabs
This Lab write-up is a group slide-up. There is only one presentation per lab group and the entire group will get the same grade. I have emailed everyone with their group a link to the shared presentation
You need to present on the slides in the Presentation the following:
1. Title page with all Lab partners listed.
2. Objectives.
3. Materials Page listed with all available components
4. Labeled Diagram Slide of proposed voltaic cell design – Draw a diagram with your phone
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9/15 – Thursday Homework: –
Anyone who wants another try at this quiz can take a third one after school on a day of your choosing. I am after everyday. I will take the best out of 3 in this case.
All you should have left is the conclusion.
Conclusion Writing:
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9/16 – Friday – A Day – 2/3a Lab, 4 single – Jump to: Friday Homework
Main focus –
a) To Construct a Voltaic cell with greatest sustained voltage in 30 seconds.
a) Made one voltaic cell and identifies anode, cathode and tested voltage.
 
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9/17 – Friday’s Homework: –
1. Title page with all Lab partners listed.
2. Objectives.
3. Materials Page listed with all available components
4. Labeled Diagram Slide of proposed voltaic cell design – Draw a diagram with your phone
Alkaline Battery Assignment –
1: How Alkaline Batteries are made :
Alkaline Battery Animation :
In the Alkaline Battery:
Inner half Cell:
ZnO (s) + H2O (l) + 2e– → Zn (s) + 2OH– (aq) (E° = – 1.28 V)
Outer half Cell:
2MnO2 (s) + H2O (l) + 2e– → Mn2O3 (s) + 2OH– (aq) (E° = + 0.15V)

End of week 3!!