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105 F11 Lecture 20 cmpd

105 F11 Lecture 20 cmpd - – “lone pairs” –...

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Chemistry 105
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What is the structure of ozone? O O O O O O O-O=O ↔ O=O- O
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From 2-D to 3-D O C Lewis Structures Molecular Shape
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Molecular shape influences reactivity
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A model to approximate shape Electron domains (regions of electron density) repel each other Best shape comes from minimizing repulsion # influences shape Consider s and p valence electrons Valence shell electron-pair repulsion model The VSEPR Model
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What counts as electron domains? Bonds between atoms Non-bonding pairs of electrons “lone pairs”
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Electron Geometry
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Dichloromethane CH2Cl2 can be used to extract caffeine from coffee. What is the molecular geometry of CH2Cl2? A. Linear B. Bent C. Tetrahedral D. Trigonal planar E. Octahedral
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What counts as electron domains? Bonds between atoms Non-bonding pairs of electrons
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Unformatted text preview: – “lone pairs” – Nonbonding pairs are physically larger than bonding pairs. – Greater repulsion tends to decrease bond angles. Multiple Bonds and Bond Angles • Double and triple bonds place greater electron density on one side of the central atom than do single bonds. • Therefore, they also affect bond angles. Using a different set of eyes • What is the electronic geometry of ammonia (NH3)? – Always draw the Lewis structure first! In which of the following molecules is the HXH bond angle smallest (where X is central atom): CH4, H2O, and NH3? A. CH4 B. H2O C. NH3 D. They are all equal E. I have no idea Defining molecular shape Carbon Dioxide Water A) Polar or B) Non-polar...
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