Tuesday, Feb 4 BLOG

Blog for Tuesday, February 4

• First we checked in homework & received the Unit 8 Review packet
• No video for this unit, unless one is found from last year
• Test is Friday

• Then we continued taking notes & watched a demo

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Hybridization

ex. NH3 Molecule: Trigonal Pyramid

The number of hybrid orbitals produced is the SAME as the number of atomic orbitals that blended.

S PPP DDDDD FFFFFFF

4 atomic orbitals made 4 hybrid orbitals so... =(SP3 hybridized)

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ex. CO2      16 valence electrons

=(SP hybridized)

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ex. KrF4      38 valence electrons

=(SP3D2 hybridized)

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Sigma and Pi Bonds

(Double + Triple Bonds...)

^ There are 4 electrons in this SP2 orbital.

• There are 2 in a SIGMA bond (2 single bonds)
• And 2 in a PI bond

ex. SO2

Pi bonds allow electrons to spread out over the whole molecule. They are the reason resonance is possible. (Delocalization) 

Need to know: 

1. Sigma bonds stuck

2. Pi bonds can move

3. Single bond = sigma

4. Double bond = 1 sigma + 1 pi

5. Triple bond = 1 sigma + 2 pi

Tomorrow: Are molecules more like magnets or marbles?

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Homework for Tonight

• TWO Webassigns:
• One - due tonight
• Other - due tomorrow (Weds @ 12am)

- Allie Boland

NEXT SCRIBE: Marlye Jerva (we switched)