Lecture _VSPER.pptx educational purpose only
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The document outlines Valence Shell Electron Pair Repulsion (VSEPR) theory, which explains how molecular shapes are determined by the repulsion between electron pairs. It details various molecular geometries such as tetrahedral, trigonal pyramidal, bent, and linear, including their associated bond angles. The summary includes examples of specific molecules like methane (CH4), ammonia (NH3), and water (H2O), describing their shapes and electron pair arrangements.
Lecture _VSPER.pptx educational purpose only
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- 6. Valence Shell Electron Pair Repulsion Theory Planar triangular Tetrahedral Trigonal pyramidal Bent
- 7. VSEPR theory assumes that the shape of a molecule is determined by the repulsion of electron pairs. Molecular Shape
- 8. VSEPR Theory • Based on Electron Dot (Lewis structures) • Theory predicts shapes of compounds • abbreviated VSEPR • VSEPR (pronounced “vesper”) stands for Valence Shell Electron Pair Repulsion • VSEPR predicts shapes based on electron pairs repelling (in bonds or by themselves) • Electrons around central nucleus repel each other. So, structures have atoms maximally spread out
- 9. VSEPR overview • Each shape has a name (you will have to know these) • Names of Shapes: • tetrahedral • trigonal pyramidal • Bent • Linear • trigonal planar
- 10. Triangular Planar Tetrahedral Trigonal pyramidal Linear Bent or V Models
- 11. methane, CH4 Bonds are all evenly spaced electrons 109.5° Tetrahedral
- 12. Less repulsion between the bonding pairs of electrons .. ammonia NH3 .. .. .. Trigonal Pyramidal
- 13. .. .. .. 109.5° (109.5°) 109.5° (107°) 109.5° (104.5°) water, H2O
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- 15. Bent or V 2 unshared pairs of e’s at top of O repel bonds and force them to bend
- 16. Molecule Lewis Structure Number of electron pairs CH4 NH3 SHAPE Tetrahedral Trigonal Pyramidal 4 4 (3 shared 1 lone pair)
- 17. Molecule Lewis Structure Number of electron pairs H2O CO2 SHAPE Bent or V 4 (2 shared 2 lone pairs) 2 Linear
- 18. Molecule Lewis Structure Number of electron pairs BeCl2 BF3 SHAPE 2 3 Linear Trigonal Planar