Q1: Week 2 – 9/11 – 9/15
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Please Make sure Your read all instructions for all assignments.
______________________________________________________ Jump to: Monday Homework 9/11 – Monday – B Day – 2, 3b/4 Lab
Main focus –
a) To better understand the Standard Reduction Potential Table and apply in to determine the Net E0cell – electromotor force (volts) for chemical reactions.
b) To review concepts of spontaneity, voltage, amperage through the Standard Reduction Table.
c) Review the concepts of the Daniell Cell (battery/voltaic cell) that includes spontaneity.
Today’s Worksheets:
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2. Daniell Cell Review: I reviewed the concepts of the an example of a voltaic cell. Video posted above in Tuesday’s Homework reviews this lesson but today I will incorporate the concepts of spontaneity into it. It will include concepts from this weekends lecture.
I use a Danielle Cell demo to illustrate these concepts.
Period 4:
1. Complete Daniell Cell Review.
2. Lab 1 – Pre Lab –
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9/11 – Monday’s Homework: –
1. Please make 1 more submissions for a the Daniell Form (activity) posted below. Please do so ONCE class is over,
2. Read my *Connections NOTES – POSTED IN This weeks notes (link: week 2 notes).
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3 – Voltaic Spontaneity lecture: This is for the homework form below..
End of Monday!
Jump to: Tuesday Homework / top
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9/12 – Tuesday – A Day – 2/3a Lab, 4
c) To begin Lab 1 – Construct a voltaic cell.
Period 2:
Danielle Cell Lecture Form 23-24 – Key p.pdf View Download
2. NO2 and N2O4 ampule demo with heat, viewing the ampule as equilibrium.
Period 3a/4:
1. Lab 1 – voltaic cell – Pre – lab discussion
2. Construct the voltaic cell and test experimental voltage.
3. Label the components of the voltaic cell and run class radio by putting the 2 batteries built in series.
LeChateliers Principle Notes:
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Notice that concentration of the NO2 is large initially and decreases as the reaction proceeds. Notice the initial concentration of N2O4 is zero (it has not been made yet) and increases as the reaction proceeds. Both NO2 and N2O4 eventually level out and at this point equilibrium has been reached! If the rate of 2NO2 combining to make N2O4 (forward reaction) is as fast as rate of N2O4 decomposing into 2NO2 (reverse reaction) then the concentration of both chemicals become CONSTANT at equilibrium. |
At point C, there 100% NO2 and 0% N2O4 thus there is no competing reaction because there is no NO2 to combine to make the N2O4. The reverse reaction is at it maximum spontaneity and the forward reaction is at its minimum. There is a Shift in the reaction to move in the reverse. Over time its spontaneity will steadily decrease until it reaches the point of equilibrium and the “death of the reaction”. |
Notice that the equilibrium position is at the bottom!! This is where the death of the reaction or where there is ZERO Spontaneity or No more release of energy into the Universe. ΔSuniverse = 0 |
Dissolving of a soluble salt : Water can compete with the Coulombic attractions of ions in a salt.
LeChatelier’s Principle Lesson : Period 4 only (up till 9:08)
______________________________________________________ Jump to: top 9/12 – Tuesday Homework: –
*Period 4: Please View the LeChateliers Principle Lesson (up till 9:08) posted above before you begin the LeChateliers Principle worksheet (#1) below. Everything else is the same for all classes.
( I will review Tomorrow for period 4)
4: Today’s Demo:
5: AP Chemistry Voltaic Cell Concepts Review worksheet 2 Video:
Jump to: Wednesday Homework / top ______________________________________________ 9/13 – Wednesday – B Day – 2, 3b/4 Lab
Main focus –
a) To Complete the LeChateliers Concept with all stressors (concentration, temperature, pressure, volume, and the common ion effect).
b) 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.
c) To identify the precipitate in a net ion equation using the solubility rules or concepts.
Period 2,4:

Period 3a:
1. Lab 1 continues
__________________________________________________ Lab 1 – The Gerber Voltaic Cell
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).
Time Lapse – Lab 1
LeChateliers Lesson: Using the Ampules of NO2 and N2O4
Diluting the concentrations in the Danielle Cell Demo:
______________________________________________ Jump to: top 9/13 – Wednesday Homework: –
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2: Intro Voltaic cell worksheet 1 video:
End of Wednesday..
Jump to: Thursday Homework / top
____________________________________________________________________ 9/14 – Thursday – A Day – 2/3a Lab, 4
Intro Voltaic Cells Worksheet 1 key pp.pdf
View Download
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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Precipitation Demonstration:
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 :
__________________________________________________ Lab 1 – The Gerber Voltaic Cell
a) Made 2 voltaic cell and identifies anode, cathode and tested voltage.
 
Time Lapse – Lab 1 – to help answer conclusion questions
____________________________________________________ Jump to: top 9/14 – Thursday Homework: –
View Download
3: AP Chemistry Voltaic Cell Concepts Review worksheet 2 Video: for Question 1!
Start from the beginning in the video.
9/15 – Friday – B Day – 2, 3b/4 Lab
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 when a precipitate is made or a common ion is added.
b) To reinforce the concepts of the voltaic / galvanic cell by taking a 15 minute 1 page quiz.
2. Complete the discussion of Lab 1. – View Time Lapse of Gerber Cell
– Production of precipitate
– limitations/errors – production of hydrogen gas
3. Complete a 15 minute quiz.
Period 3b:
1. Lab 1 Completion.
__________________________________________________ Lab 1 – The Gerber Voltaic Cell
a) Made 2 voltaic cell and identifies anode, cathode and tested voltage.
 
Time Lapse – Lab 1 – to help answer conclusion questions
Lab 1 – Put all the Voltaic cells in series to run large radio.
____________________________________________________ Jump to: top 9/15 – Friday 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 Wednseday which will be the best out of 2!
Today’s Quiz Key will be posted here after period 4:
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Voltaic Cell quiz 1 key.pdf View Download
View Download
Conclusion Writing:
Review of the Voltaic cell quiz given Today: I will open this video after both classes finish the quiz today.