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Download 3-D Drawings of Organic Molecules
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VSEPR 3-D Drawings of Organic Molecules Models in Chemistry • Structural models are simplifications, each having certain advantages and disadvantages • Together they compliment each other give a more complete understanding of the molecular reality VSEPR -Theory • Valence Shell Electron Pair Repulsion Theory • Valence electron pairs repel each other • They will try to get as far away from each other as possible! Carbon • Carbon has 4 bonds • equidistantly distributed over the surface of a sphere (nucleus) will form a tetrahedral • Angles between single bonds 3D: 109.5o vs 2D: 90o Different Models of Methane CH4 Stick VSEPR 3D Space filling Quantum Mechanical Ball/Stick Model 3D- Drawing guidelines 1. Bonds that lie in the 2D paper plane, draw as a solid line (maximize # of these) 2. Bonds protruding from the paper plane are drawn as a solid wedge 3. Bonds disappearing behind the paper plane are drawn as dashed wedge 4. The wide end of the wedge is the outermost molecule end Building Models: Example CH3CH2CH3 • Rotate to maximize # of bonds lying in the 2D paper plane • The Carbon Skeleton is always portrayed as a a horizontal zigzag line
