CHEM 110 Lecture Notes - Lecture 23: Trigonal Planar Molecular Geometry, Covalent Radius, Vsepr Theory
Monday, October 30, 2017
MT 2 Review
CHEM 110
-Bonding and Lewis Theory
•Given: Periodic table + electronegativity table
-Identify things quickly
•Endothermic process but overall process is exothermic (that crystal will form)
-As you increase number of bonds, bonds get closer and takes more energy to break it
-Covalent radius = distance between 2 atoms
•you can predict the bond separation between 2 atoms
-Top RH side is most electronegative
•Can use this to make decision if a bond is polar or not
-0.0 — 0.4 — 1.7 — 3.3
-Resonance structure:
•toss out one with highest charge
-VSEPR and Geometry
•VSEPR = e as far away as possible
•Trigonal planar = 109.5 degrees
-Hybridization
•Largest negative energy is more stable
•Mix 2 valence orbitals = make 2 new atomic hybrid orbitals
•Steps:
-Lewis Structure
-Figure out hybridization needed
•number of MO = AO
•Conservation of E
•Remember = you have number of orbitals
-You finish with the same number of orbitals
•Photoelectronspectroscopy
•Simple heteronuclear diatomic molecules
1
LY
37
CHEM 110 Full Course Notes
Verified Note
37 documents
Document Summary
Bonding and lewis theory: given: periodic table + electronegativity table. Identify things quickly: endothermic process but overall process is exothermic (that crystal will form) As you increase number of bonds, bonds get closer and takes more energy to break it. Covalent radius = distance between 2 atoms: you can predict the bond separation between 2 atoms. Top rh side is most electronegative: can use this to make decision if a bond is polar or not. Resonance structure: toss out one with highest charge. Vsepr and geometry: vsepr = e as far away as possible, trigonal planar = 109. 5 degrees. Hybridization: largest negative energy is more stable, mix 2 valence orbitals = make 2 new atomic hybrid orbitals, steps: Figure out hybridization needed: number of mo = ao, conservation of e, remember = you have number of orbitals. You nish with the same number of orbitals: photoelectronspectroscopy, simple heteronuclear diatomic molecules.
