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Covalent Bonding– VSEPR Theory
Chem-To-Go Lesson 19 Unit 4
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Valence Shell Electron Pair Repulsion Theory
Three-Dimensional Actual bond angles = 109.5˚ Valence Shell Electron Pair Repulsion Theory Areas of electron density repel each other and spread out as far as possible in 3-dimensions
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Predicting 3-d Shape & angles
# regions of high electron density molecular shape bond angle 2 linear 180° 3 trigonal planar 120° 4 bent <109.5° tetrahedral 109.5° trigonal pyramidal
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# regions of high electron density
Example #1: SiO2 # regions of high electron density molecular shape bond angle 2 linear 180° 3 trigonal planar 120° 4 bent <109.5° tetrahedral 109.5° trigonal pyramidal
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# regions of high electron density
Example #2: SO3 # regions of high electron density molecular shape bond angle 2 linear 180° 3 trigonal planar 120° 4 bent <109.5° tetrahedral 109.5° trigonal pyramidal
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# regions of high electron density
Example #3: H2O # regions of high electron density molecular shape bond angle 2 linear 180° 3 trigonal planar 120° 4 bent <109.5° tetrahedral 109.5° trigonal pyramidal
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# regions of high electron density
Example #4: CCl4 # regions of high electron density molecular shape bond angle 2 linear 180° 3 trigonal planar 120° 4 bent <109.5° tetrahedral 109.5° trigonal pyramidal
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# regions of high electron density
Example #5: PCl3 # regions of high electron density molecular shape bond angle 2 linear 180° 3 trigonal planar 120° 4 bent <109.5° tetrahedral 109.5° trigonal pyramidal
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