Chy102-Tutorial 08

Chy102-Tutorial 08 - General Chemistry General Chem. 102...

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General Chemistry Chem. 102 for Engineering General Chemistry General Chemistry Tutorial 8
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Objectives 7 Valence alence Shell hell Electron lectron Pair air Repulsion Model (VSEPR) epulsion Model (VSEPR) 7 Molecular shapes ± Linear? Linear? ± Trigonal planar? Trigonal planar? ± Tetrahedral? Tetrahedral? ± Trigonal bipyramidal? Trigonal bipyramidal? ± Octahedral Octahedral
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on The Central Atom Electron Pairs Ideal Geometries with 2 to 6 Ball and Stick Model Example Predicted bond angle Electron pair geometry Species type BeH 2 180° Linear AX 2 BF 3 120 ° Trigonal planar AX 3 CH 4 109.5° Tetrahedral AX 4 PF 5 90° 120° 180° Trigonal Bipyramidal AX 5 SF 6 90° 180° Octahedral AX 6
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Effect of unshared pairs (lone pairs) on Molecular geometry In many molecules and polyatomic ions, one or more of the electron pairs around the central atom may be unshared. In general, 1. The electron-pair geometry , is approximately the same as that observed when only single bonds are involved.
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Chy102-Tutorial 08 - General Chemistry General Chem. 102...

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