section 8.5 and 8.6 molecular geometry and polarity
DESCRIPTION
Section 8.5 and 8.6 Molecular Geometry and Polarity. In these sections… VSEPR Shapes Molecular Shapes Molecular Polarity. Molecular Geometry and Polarity. Big Picture: What are the shapes of molecules. Lewis # Structural Electron-Pair Molecular - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Section 8.5 and 8.6 Molecular Geometry and Polarity](https://reader035.vdocuments.net/reader035/viewer/2022062321/56813ac6550346895da2db84/html5/thumbnails/1.jpg)
Section 8.5 and 8.6Molecular Geometry and Polarity
![Page 2: Section 8.5 and 8.6 Molecular Geometry and Polarity](https://reader035.vdocuments.net/reader035/viewer/2022062321/56813ac6550346895da2db84/html5/thumbnails/2.jpg)
Molecular Geometry and Polarity
In these sections…
a. VSEPR Shapesb. Molecular Shapesc. Molecular Polarity
![Page 3: Section 8.5 and 8.6 Molecular Geometry and Polarity](https://reader035.vdocuments.net/reader035/viewer/2022062321/56813ac6550346895da2db84/html5/thumbnails/3.jpg)
Big Picture: What are the shapes of molecules.
Lewis # Structural Electron-Pair Molecular Structure Pairs Geometry Geometry Polarity
![Page 4: Section 8.5 and 8.6 Molecular Geometry and Polarity](https://reader035.vdocuments.net/reader035/viewer/2022062321/56813ac6550346895da2db84/html5/thumbnails/4.jpg)
Valence Shell Electron-Pair Repulsion Theory(VSEPR)
Valence electron pairs repel one another.
![Page 5: Section 8.5 and 8.6 Molecular Geometry and Polarity](https://reader035.vdocuments.net/reader035/viewer/2022062321/56813ac6550346895da2db84/html5/thumbnails/5.jpg)
Valence Shell Electron-Pair Repulsion Geometries
![Page 6: Section 8.5 and 8.6 Molecular Geometry and Polarity](https://reader035.vdocuments.net/reader035/viewer/2022062321/56813ac6550346895da2db84/html5/thumbnails/6.jpg)
# Structural Pairs = # bonded + # lone on Central Atom atoms pairs
Determining Electron-Pair Geometry - Find Number of Structural Electron Pairs
# pairs EPG2 linear3 trigonal planar4 tetrahedral5 trigonal bipyramidal6 octahedral
![Page 7: Section 8.5 and 8.6 Molecular Geometry and Polarity](https://reader035.vdocuments.net/reader035/viewer/2022062321/56813ac6550346895da2db84/html5/thumbnails/7.jpg)
Determining Molecular Geometry - Electron-Pair Geometry, ignoring Lone Pair Positions
no lone pairs 1 lone pair
![Page 8: Section 8.5 and 8.6 Molecular Geometry and Polarity](https://reader035.vdocuments.net/reader035/viewer/2022062321/56813ac6550346895da2db84/html5/thumbnails/8.jpg)
Determining Molecular Geometry - Electron-Pair Geometry, ignoring Lone Pair Positions
no lone pairs 1 lone pair 2 lone pairs
![Page 9: Section 8.5 and 8.6 Molecular Geometry and Polarity](https://reader035.vdocuments.net/reader035/viewer/2022062321/56813ac6550346895da2db84/html5/thumbnails/9.jpg)
Determining Molecular Geometry - Electron-Pair Geometry, ignoring Lone Pair Positions
no lone pairs 1 lone pair 2 lone pairs 3 lone pairs
![Page 10: Section 8.5 and 8.6 Molecular Geometry and Polarity](https://reader035.vdocuments.net/reader035/viewer/2022062321/56813ac6550346895da2db84/html5/thumbnails/10.jpg)
Determining Molecular Geometry - Electron-Pair Geometry, ignoring Lone Pair Positions
no lone pairs 1 lone pair 2 lone pairs
![Page 11: Section 8.5 and 8.6 Molecular Geometry and Polarity](https://reader035.vdocuments.net/reader035/viewer/2022062321/56813ac6550346895da2db84/html5/thumbnails/11.jpg)
Drawing Shapes on Paper: Wedge-and-Dash Notation
line = in plane of paper/screensolid wedge = coming towards youdashed line = moving away from you
![Page 12: Section 8.5 and 8.6 Molecular Geometry and Polarity](https://reader035.vdocuments.net/reader035/viewer/2022062321/56813ac6550346895da2db84/html5/thumbnails/12.jpg)
Deviations from Ideal Molecular Geometry - Lone pairs take up more room
CH4 NH3 H2O
![Page 13: Section 8.5 and 8.6 Molecular Geometry and Polarity](https://reader035.vdocuments.net/reader035/viewer/2022062321/56813ac6550346895da2db84/html5/thumbnails/13.jpg)
Molecular Polarity - Net effect of polar bonds in a molecule
![Page 14: Section 8.5 and 8.6 Molecular Geometry and Polarity](https://reader035.vdocuments.net/reader035/viewer/2022062321/56813ac6550346895da2db84/html5/thumbnails/14.jpg)
Molecular Polarity - Net effect of polar bonds in a molecule
CO2
![Page 15: Section 8.5 and 8.6 Molecular Geometry and Polarity](https://reader035.vdocuments.net/reader035/viewer/2022062321/56813ac6550346895da2db84/html5/thumbnails/15.jpg)
Molecular Polarity - Net effect of polar bonds in a molecule
NH3
![Page 16: Section 8.5 and 8.6 Molecular Geometry and Polarity](https://reader035.vdocuments.net/reader035/viewer/2022062321/56813ac6550346895da2db84/html5/thumbnails/16.jpg)
Molecular Polarity - Net effect of polar bonds in a molecule
CHF3
![Page 17: Section 8.5 and 8.6 Molecular Geometry and Polarity](https://reader035.vdocuments.net/reader035/viewer/2022062321/56813ac6550346895da2db84/html5/thumbnails/17.jpg)
Molecular Polarity - Three general rules
1. Fully symmetrical molecules with no lone pairs are nonpolar.
2. Hydrocarbons are nonpolar.
3. Molecules containing N-H or O-H bonds are almost always polar.