Q1: Week 2 – 9/6 – 9/9
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If you have not already please join the REMIND for this class.
Jump to: Tuesday Homework
9/6 – Tuesday – A Day – 2/3a Lab, 4 single –
Period 2, 4:
2. Solubility into Coulombs Law – Questions 5 & 6.
– Charge Density and Table F in the Regents Chemistry Table
– Spontaneity in chemical reactions – pathways allowable by nature (universe)
3. Writing Half Reactions from the Sodium and Chlorine Demonstration – Notes from lecture this weekend.
4. Half reactions practice – worked on Redox 4 – Net potentials Demonstrations worksheet
– half reactions and agents.
– net potentials —-> help us determine spontaneity
Today’s Net Potential lesson: using the demonstration above. – We did not finish this today!
Spontaneous Reaction NaCl demo used for class lesson :
9/6 – Tuesday Homework: –
1. Please view the Danielle Cell Lecture posted below. You may need to take notes.
2. Please make 2 submission to the Daniell Form (activity) below. You have one more submission as I will review this lesson Live in class tomorrow. You need to get as much as you can from this video and I will present it again tomorrow and take any questions! We do this together!
If you do not make your 2 submissions tonight then you will only have one for tomorrow!
1 – Daniell Cell lecture: This is for tonight homework. .
I will spend a lot more time explaining The Standard Reduction Table tomorrow! That is the table to my right in the video. I need you to get as much out of the lecture below as possible!
Here is Danielle Cell Lecture Presentation that I use for this lecture
Jump to: Wednesday Homework ________________________________________________________________________________
9/7 – Wednesday – B Day – 2 single, 3/4 Lab
Main focus –
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.
9/7 – Wednesday Homework: –
1. Please make 1 more submissions for a the Daniell Form (activity) posted above in Tuesday’s post. Please do so ONCE class is over,
2. Read my *Connections NOTES – POSTED IN This weeks notes (link: week 2 notes).
3 – Voltaic Spontaneity lecture: This is for the homework form below..
End of Thursday!
Jump to: Thursday Homework
9/8 – Thursday – A Day – 2/3a Lab, 4 single
Voltaic Spontaneity Form – 22-23 Key p.pdf View Download
LeChateliers Principle Notes:
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 : If you need to review this..
9/8 – Thursday Homework: –
5: AP Chemistry Voltaic Cell Concepts Review worksheet 2 Video:
9/9 – Friday – B Day – 2 single, 3b/a 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.
b) To identify the precipitate in a net ion equation using the solubility rules or concepts.
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).
9/9 – Friday Homework: –
3: AP Chemistry Voltaic Cell Concepts Review worksheet 2 Video:
Start from the beginning in the video.
5: Intro Voltaic cell worksheet 1 video:
End of week 2!