CHAP010_new - Bonding and Molecular Bonding Structure...

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Chapter 10 1 Bonding and Molecular Bonding and Molecular Structure Structure Chapter 10 Chapter 10
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Chapter 10 2 Covalent Bonding and Orbital Overlap Covalent Bonding and Orbital Overlap - Lewis structures and VSEPR do not explain how a bond forms. - VSEPR predicts the shape of a molecule, but it does not explain how the molecule is put together. - One method to explain bonding would be Valence Bond Theory : - Bonds form when atomic orbitals on atoms overlap. - Two electrons are shared by the orbital overlap.
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Chapter 10 3 Covalent Bonding and Orbital Overlap Covalent Bonding and Orbital Overlap
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Chapter 10 4 Hybrid Orbitals Hybrid Orbitals sp sp Hybrid Orbitals Hybrid Orbitals - Consider BeF 2 - Be has a 1s 2 2s 2 electron configuration. - There is no unpaired electron available for bonding. - We could promote and electron from the 2s orbital on Be to the 2p orbital to get two unpaired electrons for bonding. - The F-Be-F bond angle is 180 ° (VSEPR theory). - BUT the geometry is still not explained .
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Chapter 10 5 Hybrid Orbitals Hybrid Orbitals sp sp Hybrid Orbitals Hybrid Orbitals - We can solve the problem by allowing the 2s and one 2p orbital on Be to mix or form two hybrid orbitals (process called hybridization). - The hybrid orbitals come from an s and a p orbital and is called sp hybrid orbital.
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Chapter 10 6 Hybrid Orbitals Hybrid Orbitals sp sp Hybrid Orbitals Hybrid Orbitals - The two sp hybrid orbitals are 180 ° apart. - Since only one of the Be 2 p orbitals has been used in hybridization, there are two unhybridized p orbitals remaining on Be.
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Chapter 10 7 Hybrid Orbitals Hybrid Orbitals Hybrid Orbitals Hybrid Orbitals - Other hybrids can be formed by mixing additional p and/or d orbitals
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Chapter 10 8 Hybrid Orbitals Hybrid Orbitals
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Chapter 10 9 Hybrid Orbitals Hybrid Orbitals
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CHAP010_new - Bonding and Molecular Bonding Structure...

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