Lecture 19

Lecture 19 - Chemistry 115 Lecture 19 Outline Chapter 9.1,...

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Chemistry 115 Lecture 19 Outline Chapter 9.1, 9.2 Recitation: VSEPR, bond polarity Valence Bonds HW due Friday 3/25 at 11pm Lab Monday: Chapter 10 - Organic Reactions and Polymers See sections 10.4 and 10.5 for specifics
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Main Points From atomic orbitals to VSEPR geometries: How does an atom's bonding environment affect its electronic structure? Hybrid orbitals sp sp 2 sp 3 sp 3 d sp 3 d 2 σ -bonding with hybrid orbitals π -bonding with hybrid orbitals
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Concept of atomic orbitals and shells Full-shell stability Concept of covalent bonding Overlap, electron sharing and mutual filling of shells, electron pairing, Lewis structures, octets Concept of Valence Shell Electron Pair Repulsion (VSEPR) and molecular shape AX 2 , AX 3 , AX 4 , AX 3 E… How can we understand the shapes of molecules in terms of underlying structure of the orbitals on the atoms?
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But there’s a snag… How many covalent bonds can be made with s and p orbitals? http://faculty.njcu.edu/tpamer/chemprep/images/p_orbitals.gif
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Clearly, something else is happening If only two covalent bonds can be made with the orbitals as they are… …then something must be happening to the orbitals in order to allow for four (or more) bonds to form around an atom
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The answer… Bonding drives a rearrangement of electron density on
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Lecture 19 - Chemistry 115 Lecture 19 Outline Chapter 9.1,...

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