Ch6temp - Chapter 6: Molecular Structure Molecular...

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Molecular compounds: Covalently bonded species Represented by Lewis structures 2-D representation   3-D molecular shape V alence  S hell  E lectron  P air  R epulsion model VSEPR Chapter 6:  Molecular Structure © Kay Sandberg
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Atoms that obey octet rule can have only: 2, 3 or 4 electron regions The electron regions around atoms repel each other (like charges) therefore they get as far away from each other as they can while still being tethered (attracted) to the nucleus. Section 6.1 © Kay Sandberg
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+ + V alence  S hell  E lectron  P air  R epulsion model VSEPR Electron groups/regions LP single bond double bond triple bond An e- pair = 1 region An e- pair = 1 region 2 e- pairs = 1 region 3 e- pairs = 1 region + + + + + Section 6.1 © Kay Sandberg
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O C O O C O O C N H Cl C Cl Cl Cl P F F F Electron Regions: How many regions around the lettered atoms? a b c d e f 2 2 2 4 3 4 © Kay Sandberg Section 6.1
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Section 6.1 + © Kay Sandberg nucleus 2 electron regions 120 3 electron regions + + 4 electron regions 109 o Electron Region Distributions
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Section 6.1 © Kay Sandberg 2 electron regions about an atom Molecular Shapes Linear + + + + + + O C O Named:  according to atomic distributions              about the central atom Angle:  according to electronic distribution            about the central atom
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Section 6.1 © Kay Sandberg 120 o 3 electron regions about an atom Molecular Shapes Trigonal planar F C O H +
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Section 6.1 © Kay Sandberg 109 o 4 electron regions about an atom Molecular Shapes tetrahedral H C H H H +
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Section 6.1 © Kay Sandberg 120 o 3 electron regions about an atom Molecular Shapes bent Named:  according to atomic distributions              about the central atom Angle:  according to electronic distribution            about the central atom Cl N O + < 120 o
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Section 6.1 © Kay Sandberg 109 o 4 electron regions about an atom Molecular Shapes H O H + bent < 109 o
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Section 6.1 © Kay Sandberg 109 o 4 electron regions about an atom Molecular Shapes Trigonal pyramidal H N H H +
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Trigonal pyramidal + Trigonal planar
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O C O O C O O O H H Cl C Cl Cl Cl P F F F Give the indicated angle. A B C D E 180 o © Kay Sandberg Section 6.1 <109 o <109 o 120 o 109 o
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Molecular Structure # of electron regions Distributions to minimize repulsion # of atoms attached molecular shape 2 180° 2 linear 3 120° 2 3 bent trigonal planar 4 109° 2 3 4 bent trigonal pyramidal tetrahedral In the plane Going behind Coming out toward you (coming out of the plane) © Kay Sandberg Section 6.1
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Ch6temp - Chapter 6: Molecular Structure Molecular...

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