Class notes

Class notes CHEM 121: Chapter 9

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Course
CHEM 121 (CHEM121)

Institution
University Of British Columbia (UBC )

This chapter shows how hybrid orbitals look like, energy of hybrid orbitals, how to sketch Valence Bond Diagrams and Orbital Overlap Diagrams

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Uploaded on December 27, 2022
Number of pages 10
Written in 2022/2023
Type Class notes
Professor(s) Laura stirchak
Contains All classes

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Chapter 9: Valence Bond Theory

1) (x ) I 2022

, valence Bond Theory,vBi)
molecule
-identify 5 or bonds in a given
~
relate this to USEPR

~
Hybridization

Bond forms due to overlap

↳ Sigma bond

↳ X2 pi bond

· Each covalent bond like an idependant species

↳) treat each covalent bond as an independant interaction

↳) only consider paramagnetic species in this chapter

↳> don't think about
antibonding, bonding here

Orbitals in UBT and MO theory have the same shape no: molecular orbital

but are labelled DIFFERENTLY

NO: O IS
example:
VBT:5 (Is-1s) write which cribals have overlapped

orbitals enough
Hetero nuclear: that are close in
energy

dash like
different colors represents
that

represent bonding theve
was nO

over 10p
-
T(Gp2-Gp2)

· (py -<py)
/VBT notation)

TCGp2 -2pn)

2

2 BI

steps on how to drow valence bond diagram:

1 write types of atom
2P4

2. draw orbitals /2s, <p) X

↳) draw is line lower than 2p
CP2L
3. Fill lower energy orbitals first
2
4 satisfy nunds rule still all P orbital first 1)
key Ideas

· one bond will Always bonds
be sigma rest will be pi

I

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