Archive – Q3 week 3 – 18-19
week 3
Week of 2/11 – 2/15 – Remember to Refresh this page every time you open!
Monday – 2/11 – period 2 –
1: Bonding Test 2 –
2: Hand back Bonding test 1 –
period 3/4 –
1: Hand back Bonding test 1 –
2: Review periodicity Test
3. Bonding Test 2 –
Please Read for the homework tonight:
Our valence bond theories = hybridization, VSEPR, Lewis dot diagrams have limitations as we have seen. How does the chlorate ion have resonance if it is sp3 hybridized and there are no un-hybridized p orbitals to pi bond with?
Remember that dots on a piece of paper can give us so much information for many molecules some complex but some our rules of formal charges that help guide us to the best structure guide us to structures that actually do not exist based on their properties found experimentally!
Here is an example of the sulfate ion, SO4-2
Above is what our valence bond theory predicts using the rules of Formal Charges and etc. THIS IS NOT WHAT WE FIND experimentally!!! Actually the lewis diagrams that we find from experimental evidence looks like the following.
WHAT??? How can it exist more like this structure when clearly is breaks the rules of Formal Charges (+2) on the Sulfur atom? Actually the charge is measured to be +1.77 on the sulfur in experiments. What gives? The bonding is neither covalent nor ionic it is something in between..
So we are at the end or the limits of this valence bond theory. We were were always going to be limited by a theory that treats electrons as dots when we have learned from electrons exist as waves!!!
So lets learn a new theory that picks up where valance bond theory leaves off. It is called MO theory or molecular orbital theory and it treats electrons as waves!
Monday 2/12 – HW or today’s assignment:
1. Read notes above:
2: Watch the Lecture below on MO (molecular orbital theory) . You are going back to MIT! You will only need about the first 30 minute of the video.
3. Complete the form below:
End Monday..
Tuesday – 2/12 – period 2/3 –
1. Take the periodicity Bonus.
2. MO theory – digital notes on linked presentation- “MO Bonding”
I linked every student a MO presentation to annotate and
– completed the presentation that students annotated to.
– students completed the nitrogen and Oxygen worksheet in class with me.
– discovered that oxygen will have 2 lone pairs in the anti-bonding orbital that makes O2 paramagmetic.
– discovered the small gap between the anti- bonding orbitals is the reason oxygen is light blue.
isolated liquid oxygen/paramagnetic demo.
Selected correlation graphs (Li2 – C2) – These were in the student presentation “MO Bonding “
period 4 –
1: MO theory – digital notes on linked presentation- “MO Bonding”
Tuesday 2/12 Homework-
*Remember that higher the bond order, shorter the bond distance, and higher the bond enthalpy (energy needed to break the connection between atoms).
1: Complete the bonding 5 MO Yo! complete key.pdf worksheet and review with the key below or lecture below the form below.
2: View lecture on Gap theory and complete form below: (best out of 2 attempts!)
3: I know that I am giving you a lot work here but THERE IS NO HW THIS BREAK!
Lecture on bonding 5 MO Yo!.pdf worksheet:
Lecture on Gap Theory:
Form on Gap theory (must watch lecture / and view slides on Gap Theory first):
Proof that the HOT AIR BALLOONS can launch successfully!!
End Tuesday!
Wednesday- 2/13 – period 2 –
1: Review MO diagrams N2 and N2+ – I modeled both on first side.
– Determined the BO for both
– Compared Bond lengths and bond energies for both using their respective Bond Energies
Used the Types of solids worksheet to start identifying the type of solid
Network Solids – Covalently bonded crystal structure –
– we saw graphite – C (s) and diamond (C) are examples
We should know how to identify the band gap diagrams of the metallic solids, network, and molecular solids.
2: Review Gap Theory/ Chromophores / Crystal Field Splitting
3: Chromophores vs Crystal Field theory
period 3/ 4 –
1: Periodicity Extra credit/Test review
1: Review MO diagrams N2 and N2+ – I modeled both on first side.
– Determined the BO for both
– Compared Bond lengths and bond energies for both using their respective Bond Energies
Used the Types of solids worksheet to start identifying the type of solid
Network Solids – Covalently bonded crystal structure –
– we saw graphite – C (s) and diamond (C) are examples
We should know how to identify the band gap diagrams of the metallic solids, network, and molecular solids.
3. REview Gap Theory /Chromophores/ Crystal field theory
4: Chromophores vs Crystal Field theory
Today’s or Tomorrow’s Demo:
Wednesday 2/13 Homework:
1: View lecture on Intermolecular attractions
2: Complete form on intermolecular attractions (best out of 2 submissions).
Lecture on intermolecular attractions:
Intermolecular attractions form:
Intermolecular Attractions Presentation:
End Wednesday..
Happy Vanadium Day !!
Will you be my isotope?
Thursday – 2/14 – period 2/3 –
1. Complete Gap theory with Solids worksheet
2. Discussion of LDF’s, dipolar forces, and H- Bonds
3. Worked on and completed Classwork worksheet: IMF comparison worksheet 1819.pdf
period 4 –
Thursday – 2/14 – period 2/3 –
1. Complete Gap theory with Solids worksheet
2. Discussion of LDF’s, dipolar forces, and H- Bonds
3. Started Classwork worksheet: IMF comparison worksheet 1819.pdf
Will complete with me using lecture that will posted later.
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Why would N2 (l) be a great
liquid to use to create a large amount of vapor pressure?
Thursday – 2/14 Homework:
Period 2/3 Homework:
1. Make another submission to last nights form. It is on automatic email for your quick review/
2: Study your forms (MO Form 1), (Band/Gap Theory) , (IMF form).
3: Review bonding 7 – intermolecular attractions.pdf worksheet with the lecture posted below:
4. Complete the RAT that was given out. I will post the key soon:
You need the following structures for the RAT:
RAT Key:
Period 4 Homework:
1. Please complete the IMF comparison worksheet 1819.pdf with me using the lecture that will be posted later.
2. After you complete step 1 above, please make your second submission to last nights form. It will be on automatic email return for your review.
We will do the complete the RAT worksheet and parts of bonding 7 – intermolecular attractions.pdf worksheet in class tomorrow as we have 2 periods.
You could start the bonding 7 – intermolecular attractions.pdf worksheet by viewing the video below for more review of IMF’s.
Bonding 7 worksheet lecture:
IMF Comparison Review – Lecture:
End Thursday
Friday – 2/15 –
Molecular solids Network solids Metallic Solids
Molecules!!! Crystals of covalent bonds Crystals of nuclei in sea of e–
H2O, CH4 SiO2, C (s)graphite Ni, Cu
IMF depending on polarity covalent bonds metallic bonds
Chromophores – pi stacking pi stacking – Non Chromophore Crystal field splitting
Non conductive Conductive conductive
Low Melting points high melting points High melting points
(breaking IMF’ not BONDS!!!) Breaking BONDS!!!! Breaking BONDS!!!!
period 2 –
1: Bonding TEST 3 – MO diagrams, Band theory, crystal field splitting, chromophores, intermolecular attractions, types of compounds.
surprise bonus: Last nights homework.
period 3/4 –
1: RAT/ IMF comparison worksheet 2 – new worksheet this year! I need a key!
2: Bonding TEST 3 – MO diagrams, Band theory, crystal field splitting, chromophores, intermolecular attractions, types of compounds.
surprise bonus: Last nights homework.
This was a great week! Great Job! Thanks for your hard work!!
Homework: HAVE A NICE BREAK!