lecture14 - Chem 1A Lecture 14 Molecular orbital theory...

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Molecular orbital theory Chem 1A Lecture 14:
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Midterm II Mean: 72.5 std. dev: 15.6 Thumbs up!
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Molecular Orbital Theory Valence bond theory explains chemical bonding qualitatively, assuming that electrons occupy atomic orbitals. This does not account of electronic properties of the molecule as a whole . O O Valence bond theory runs short with oxygen molecule: each O is sp 2 hybridized, 1 sigma bond, 1 pi bond VB theory predicts that all electrons are paired, no unpaired electrons O 2 is diamagnetic? O 2 is paramagnetic!
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Forming Molecular Orbitals (MO) Atomic wavefunctions can combine in an additive way and in a subtractive way. The waves can constructively or destructively interfere
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Forming Molecular Orbitals (MO) Destructive and constructive interference in s orbitals Antibonding orbital is higher in energy than the bonding orbital The two atomic s -electrons form an electron pair in the lowest energy MO (bonding)
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Molecular Orbital Theory Destructive and constructive interference in p orbitals Formation of sigma MOs from atomic p -orbitals
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Molecular Orbital Theory Destructive and constructive interference in p orbitals Formation of pi MOs from atomic p orbitals
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lecture14 - Chem 1A Lecture 14 Molecular orbital theory...

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