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CHEM 1320 Study Guide - Ethane

5 pages113 viewsFall 2013

Department
Chemistry
Course Code
CHEM 1320
Professor
Ganley

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Chapter 10: Chemical Bonding II
11/13
Atomic Orbitals (AOs)
Quantum theory:
Electrons exist only at discrete energy levels
Electrons have wave properties
Wavefunction: probability that an electron will be at a
certain location
AO: Area around a nucleus likely to contain an electron
Each orbital can have 2 electrons (max)
How does Lewis theory explain the bonds in H2 and F2?
Sharing of two electrons between the two atoms
Bond Distance Energy Bond Length Overlap of
H2436.4 kJ/mol 74pm 2 1s
F2150.6 kJ/mol 142pm 2 2p
Valence Bond Theory:
-Valence Bond model:
-Covalent bonds form by combining valence e- orbitals
-AOs combine, overlap, and orbit both nuclei
-Overlap: along an imaginary line connecting the nuclei
Overlap of two “s” electrons: σ-bond
Hybrid Orbitals:
-Methane (CH4)
-4 C-H bonds, all the same
-All sp3-s bondsσ
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Hybridization–mixing of two or more atomic orbitals  hybrid
orbitals
1. Mix at least 2 nonequivalent atomic orbitals (s and p). Hybrid
orbitals: different shape
2. # Hybrid orbitals = # atomic orbitals used
3. Covalent bonds are formed by:
a. Overlap of atomic orbitals
b. Overlap of hybrid orbitals with atomic orbitals
c. Overlap of hybrid orbitals
Ethane (C2H6)
C-H are a sp3-s bondsσ
C-C is a sp3-sp3 bondσ
Lewis theory and NH3:
If the bonds form from overlap of 3 2p orbitals on nitrogen with
the 1s orbital on each hydrogen atom, what would the molecular
geometry of NH3 be?
How do I predict the hybridization of an atom?
Count the # of lone pairs AND the # of atoms bonded
*7A (if they have one bond) and H are unhybridized
# of Lone Pairs
+
# of Bonded Atoms Hybridization Examples
2 sp BeCl2
3 sp2BF3
4 sp3CH4, NH3, H2O
5 sp3d PCl5
6 sp3d2SF6
Halogens:
3rd Period (and up)
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