CH6 skeleton

CH6 skeleton - CHAPTER 6: MOLECULAR STRUCTURE Lewis...

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CHAPTER 6: MOLECULAR STRUCTURE Lewis structures - 2D representations of 3D molecules. Valence Shell Electron Pair Repulsion ( VSEPR ) – A molecule adopts a geometry that minimizes the repulsion between the bonding and lone pairs of electrons Electrons repel other electrons. ..they want to get as far apart from each other as possible. Suggested problems: 1, 3, 7, 9, 11, 13, 17, 19, 21, 23, 27, 29, 33, 41, 49
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Applying VESPR •Draw Lewis structure •Count the number of electron regions around the central atom. An electron region can be a single, double, triple bond or lone pair. •The arrangement of electron pairs that minimizes repulsion is called the electron group geometry •The arrangement of atoms is called the molecular geometry
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Atoms obeying the octet rule have two, three or four electron groups (bonding electrons or lone pairs) LINEAR TRIGONAL PLANAR TETRAHEDRAL Electron group geometry
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Summary of VSEPR-electron group geometry 180 ° 109 ° out in CO 180 ° 180 ° H H 120 ° 120 ° HH C 109 ° 120 °
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Lone pair vs. bonding pair repulsion
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Section 6.1 Molecular Shape 1. Draw Lewis structure 2. Determine # of electron groups and electron group geometry 3. Determine molecular shape by considering the positions of the atoms only 4. Molecular shape cannot be determined correctly if the electron group geometry is not considered first
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Formula Lewis structure Molecular shape (bond angle) N 2 C 2 H 2 Linear electron group geometry
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Formula Lewis structure Molecular shape (bond angle) COH 2 BF 3 SO 2 Trigonal planar electron group geometry
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Formula Lewis structure Molecular shape (bond angle) SiF 4 NH 3 SH 2 Teterahedral electron group geometry
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Electron Geometry Molecular Shape linear trigonal planar tetrahedral
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These classifications can be used to describe both electron group geometry and molecular shape. Expanded Octets 5 ATOMS around the central atom- PF 5 (phosphorus pentafluoride) 6 ATOMS around the central atom - SCl 6 (sulfur hexachloride) F F FP F F Cl Cl Cl S Cl Cl Cl TRIGONAL BIPYRAMIDAL OCTAHEDRAL (8 faces) 9 0 ° 120 o
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This note was uploaded on 08/30/2009 for the course CH CH 221 taught by Professor Gorman during the Spring '08 term at N.C. State.

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CH6 skeleton - CHAPTER 6: MOLECULAR STRUCTURE Lewis...

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