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Archive – Q3 –  week 6 – 18-19

week 6

Week of 3/12 – 3/16 – Entire week is updated!

 
3/12 – Monday – period 2/3 – 
 
1. Thermodynamic sign review
2: Thermodynamics test practice
3: derive nonstandard G formula for conditions other than standard (1atm 298K)
 
I used the following notes to derive this:
Thermo 9 Notes for nonstandard.pdf
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                            period 4 – 
 
1. Thermodynamic sign review
2: Thermodynamics test practice
2: derive nonstandard G formula for conditions other than standard (1atm 298K)
 
3/12 Monday Homework – HW: Nonstandard G
 
*If a Snow Day occurs tomorrow you will have another assignment posted under Tuesday.
 
1. Please view the lecture below on the derivation. I am asking that you follow along and try to pick up the major understandings of the derivation.
 
2.  Complete the form that reviews the lecture.
 
3. Review the practice Thermo test –Test on Wednesday- 
Nonstandard G derivation formula:
Monday Night Homework: Derivation lecture: 
 

Nonstandard delta G derivation 1718



We will have a Thermodynamics test on Wednesday 3/14 
It will look very much like the Review Test you took today.
 
I have posted a blank example of todays classwork (Revie Thermo Test)
 
(Blank)
THermo Test 1 – 7a – THermo Review Test.pdf
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(Key)
THermo Test 1 – 7a – THermo Review Test Key 1718 p.pdf
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Test Topics:  (Thermo Review Test is a Great Review!)
A.  Calorimetry – thermo 1 calorimetry key 0809.pdf
B.  Hess law with – Heat of Formation – Thermo 3 heat of formation.pdf
C.  Hess Law with Reactions – Thermo 4 – Hess Law ditto key.pdf
D.  Hess Law with Bond Energies – Bonding 6 – Bond energies.pdf
 

E.  

∆S from absolute entropies – T

hermo 7 – Gibbs Free energy Free Response 1984 key.pdf 

 

F.  

∆G calculations – 
 
thermo 6a – Enthalpy, Entropy , Gibbs of Glucose methane.pdf
thermo 7 – Gibbs Free energy Free Response 1984 key.pdf

 
 
3/13 – Tuesday –  Snow day?  
                           
Okay we have seen that that changes in concentrations (molarity) of solutes in a solution or partial pressures in a mixture of gases can gauge or measure the change in a systems entropy (S) from nonstandard values we get from tablature.  This means the S(from standard conditions) can be converted into S (from nonstandard conditions) by how much the concentration of molarities change from 1M (for c) or 1 atm (for p)  (standard conditions).
 
                                            S   =    S0    –  R  ln c             or              S =     S0    –  R  ln p
             We track how much the c or p changes from 1 by using the reaction quotient (Q).
 
                                                                        S  =    S0    –  R  ln Q
 
                                                                    Q = [Products]x   
                                                                            [Reactants]y
 
Since the systems entropy is connected to overall entropy of the universe in the Gibbs free energy equation:
 
                                                               ∆G0 = H0 – T∆S0
 
When we substitute the nonstandard entropy (S) into the above equation and simplify we get an equation that measures nonstandard ∆G!!! We are not bound by standard conditions no more!!
 
                                                              ∆G ∆G0  RT ln Q
 
This means that we can evaluate chemicals reactions spontaneity based on a evaluation of the what the current concentrations or partial pressures are (Q).  Changing the concentrations of the products and reactants changes the ∆G or spontaneity! 
This is the equation of Le Chateliers Principle!
 
This equation is your reference tables:
Todays assignment:
1.  Complete thermo 6 – Gibbs Free Energy 1617.pdf with me with another lecture that is posted below. Take note that I am using an updated version of this worksheet that I posted this morning.  The problems is the same but I included tabulated data for ease. 
 
thermo 6 – Gibbs Free Energy 1617.pdf
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thermo 6 – Gibbs Free Energy key.pdf
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Thermo 8 Non standard GIbbs 2.pdf
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Thermo 8 Non standard GIbbs 2 key.pdf
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Tuesday assignment Lecture:  

3/14 – Wednesday – period 2- 
 
1.  Thermo test – 1 period test timed – (only concepts from the practice test)
                                        period 3/4 – 
 
1. Review of Thermo signs Lecture Form & supersaturated demo.
2.  Thermo test – 1 period test timed – (only concepts from the practice test).
3. Derivation of  ∆G formula that ties spontaneity with equilibrium (Keq).
3/15 Wednesday HW: 
 
1.  View the in class lecture (up to question 27:00 min mark only) about how ∆G, Keq, and Q are connected. (Le Chateliers Principle!!)
 
2:  View the tank demonstration
 
3. Complete the form below.
4.  Complete the first side of Equilibrium 1 – Gibbs.pdf worksheet and review with key. Careful with the math. If you are not accustomed to working with natural log please use the key to help.  The calculator does all the work really and I will explain tomorrow if the math gets you down.
 
Equilibrium 1 – Gibbs.pdf
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Equilibrium 1 – Gibbs key 1011.pdf
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Lecture for the form(up to question 27:00 min mark only):
Ok so we should understand that the larger the Keq the more more negative the ΔG and the smaller the Keq the  more positive ΔG is.  This is intuitive but it relates to the following formula:
 
                                                                     ΔGo=−RTlnK
 
 
 
Hey that’s in our reference tables!!! In Blue?
 
Form:
Tank Demonstration:
 


End of Wednesday!

3/15 – Thursday  period 2/3-  (Fizz Keeper somewhere)..
 
1.  THermo test review
2.  ∆G and equilibrium (Keq), Completion to equilibrium reactions 
     – thermo google slides – (slides 57 – 59)
3.  Le Chatelier’s Principle (Q vs. Keq) with solutions, Cobalt complex Lab Demo – 
 
Did not finish the Colbalt Complex – from the 2nd test on
 
LeChateliers principle worksheet.pdf
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LeChateliers principle worksheet KEY 2012 p.pdf
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4. Le Chateliers’s Principle with Heat,  N2O4  ——>  2 NO2 demo
       a) Heat changes the Keq position. 
      b) Derivation
 
Equlibrium 2 – Gibbs and lechats.pdf
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Equlibrium 2 – Gibbs and lechats key.pdf
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                                  period 4 – 
 
1.  THermo test review
2.  ∆G and equilibrium (Keq), Completion to equilibrium reactions 
     – thermo google slides – (slides 57 – 59)
 
Did not get to this below:
3.  Le Chatelier’s Principle (Q vs. Keq) with solutions, Cobalt complex Lab Demo
4. Le Chateliers’s Principle with Heat,  N2O4  ——>  2 NOdemo
       a) Heat changes the Keq position. 
      b) Deviation
 
We know that increases and decreases of Temperature CHANGE Keq position or value.  An Endothermic Reaction is favored in higher temperatures and an Exothermic Reaction is favored in lowered temperatures. We understand this by setting our standard ΔG formulas together and looking at the ln K equals (specifically at the ΔH part of the equation).
 
Cobalt Complex Le Chateliers (Regents Chemistry) Lab:
 
 
Thermo google slides: (slides 57 – 59)

Thermodynamics


HW:  
 
1.  Please complete the Le Chateliers Principle Side 1 and review with the key.  Think while you are doing the worksheet, “What are we doing with Q in relation to K? “When does Keq move in relation to Q?
 
LeChateliers principle worksheet.pdf
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LeChateliers principle worksheet KEY 2012 p.pdf
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2. Please use the worksheet below to follow along with me in the lecture below. ONLY THE  FIRST SIDE!
    THis will make perfect sense if you are on it and have been fighting through all my forms!
 
Equlibrium 3 – Equilibrium constants 1.pdf
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Equlibrium 3 – Equilibrium constants 1 key.pdf
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3.  We will do only the first side!!! The second side is the Quadratic catastrophe that we will discuss      
     tomorrow.
 
4. No form tonight as I feel there might be a mutiny if I make another one. But you should realize they are       helping solidify your understanding. Remember these are not just problems! You have to see the    
    concepts behind them!!  THese problems are like big people who look scary but are just sweet sensitive
    people that once you get to know them you ….ok i think you get it..
Equilibrium Ice table / intro to KSP / Q vs K in action:
 
I made mistake in question 2 (although the answer of the Ksp is correct):  
I should have (1.3 x 10-4 /2) in the value for the equilibrium concentration for the CrO4-2 ion in both the ice table and inside the formula for the solving of the Ksp value.
 
I made a mistake (imagine that!) on number three. In the ICE table in for the second reactant I should of calculated 1.06 x 10-3 not .065 x 10-3.  THanks Caroline!!!!
The final Keq is calculated correct but I had the wrong value there.
 
 

3/16 – Friday  “Career Cafe is taking away my Sophomores today But Not My Juniors” 
                              Please make sure you view the HW below for what you missed.  I really need to  
                              move forward as time is ticking (52 Days)…
 
 Last night we introduced a new Keq that we call Ksp when we look at ionization reactions:
 
 AgCl(s)<----->Ag+(aq)+Cl(aq)  
 
Ksp = [Ag+][Cl]
All ionization reactions have the same general reactions so all the equilibrium expressions look the same. Its called a solubility product (Ksp) instead of Keq because its Ksp depend on the product of the ions in solution. The more ions in solution at equilibrium the higher the Ksp thus the more soluble the salt is.  We can measure solubility based on equilibrium constants. We do not consider the AgCl (s) in the equilibrium expression because it is a solid, which has no dilution ability.
 
 Period 2:        
 

1: LeChateliers Principle with 
ΔG = ΔG° + RT ln Q, 
      reviewed how temp and pressure are a bit different
     U diagrams!!!
Equlibrium 4 – Equilibrium constants 2.pdf
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Equlibrium 4 – Equilibrium constants 2 KEY.pdf
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2. Question 1, equilibrium 4, Ksp question.
3.  Question 2, equilibrium 4, “the Quadratic Catastrophe
4.  Equilibrium 6a – Small Equilibrium Constants, “Approximating away the Catastrophe”.
Equlibrium 4 – Equilibrium constants 2.pdf
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Equlibrium 4 – Equilibrium constants 2 KEY.pdf
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Equlibrium 6a Small equilibrium constants.pdf
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Equlibrium 6a Small equilibrium constants key.pdf
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       Period 3/4: 
 
 
1.  Derive how temperature affects Keq/ Lechats
 
     LeChateliers Principle with ΔG = ΔG° + RT ln Q, 
      reviewed how temp and pressure are a bit different
     U diagrams!!!
 
2. Review Co complex lab with concentrations and Heat.
 
3. Question 1, equilibrium 4, Ksp question.
4.  Question 2, equilibrium 4, “the Quadratic Catastrophe
5.  Equilibrium 6a – Small Equilibrium Constants, “Approximating away the Catastrophe”.
6.  Equilibrium 5a – Ksp continues with the approximation skill. – Did not get to this 
 
Weekend HW:  1 part 2 Question Test (Ksp) – 20 minutes Monday!
Sophomores will have to watch and complete additional watches and worksheets to catch up.
Those lectures will up by the afternoon.
 For those in class Friday – Juniors:

1: Complete  Equlibrium 5 – Ksp.pdf worksheet and/or with me with the lecture below:
If you feel that you are on your way feel free to complete without video lecture and review with the key below.  YOUR ARE TO COMPLETE LETTER D in the question. In the video I say not to but please complete it and review with Key.
 
Equilibrium 5 Lecture: see below 
 
Equlibrium 5 – Ksp KEY.pdf
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Equlibrium 5 – Ksp.pdf
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2:  Complete Equlibrium 5a – Ksp.pdf worksheet with me with lecture below:
Equlibrium 5a – Ksp continues.pdf
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Equlibrium 5a – Ksp continues key p.pdf
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Do not wait till Sunday night to do this!!!
I may live stream Sunday at 8:00 pm.. for those with questions. More details to follow..
For those NOT in class Friday but now you know what your career will be (Sophomores):

Classwork (Some of y’all missed 2 periods)
Please download these worksheets if you did not get them Thursday and use them to follow along with me in the following lectures. Please watch them in the following order.
 
1.  Equilibrium 4 – Question 1 – Ksp problem explained/modeled – lecture below.
 
Equlibrium 4 – Equilibrium constants 2 KEY.pdf
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2.  Equilibrium 3. – Question 3 – Backside – Quadratic Catastrophe Lecture below.
 
Equlibrium 3 – Equilibrium constants 1 key.pdf
 
3.  Equilibrium 6a – Circumventing the Quadratic Catastrophe Lecture.
 
Equlibrium 6a Small equilibrium constants key.pdf
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4.  Complete  Equlibrium 5 – Ksp.pdf worksheet and/or with me with the lecture below:
If you feel that you are on your way feel free to complete without video lecture and review with the key.  YOUR ARE TO COMPLETE LETTER D in the question. In the video I say not to but please complete it and review with Key.
5:  Complete Equlibrium 5a – Ksp.pdf worksheet with me with lecture below:
 
 
Keys to the worksheets are posted above.
 
Its Going to be a Great Weekend!!
 
Do not wait till Sunday night to do this!!!
 
I may live stream Sunday at 8:00 pm.. for those with questions. More details to follow..
HW Lecture: Equilibrium 5 Lecture: 
 
Homework Lecture: Equilibrium 5a Lecture: 
 
 
Classwork Lecture 1: Equilibrium 4 – question 1 use the backside for space.
Classwork Lecture 2 : The Quadratic Catastrophe lecture – 
Classwork Lecture 3: Circumventing the Quadratic Catastrophe
Start this at 12:00 – Approximation Lecture –