Molecular Shapes - Chemistry PDF
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This document covers the concept of molecular shapes. It explains VSEPR theory as a method of predicting molecular geometries by looking at repulsions from bonding and lone electron pairs. It also contains questions about different compounds and their shapes. It's suitable for secondary school students studying chemistry.
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Molecular Shapes Whyis knowing the shape of a compound important? VSEPR formula Structural formula that shows the 3D positions of the peripheral groups PhET Simulation: Molecular Shapes ‘Model’ tab https://phet.colorado.edu/sims/html/molecul e-shapes/latest/molecule-sha...
Molecular Shapes Whyis knowing the shape of a compound important? VSEPR formula Structural formula that shows the 3D positions of the peripheral groups PhET Simulation: Molecular Shapes ‘Model’ tab https://phet.colorado.edu/sims/html/molecul e-shapes/latest/molecule-shapes_en.html VSEPR theory Valence shell electron pair repulsion theory e- pairs REPEL each other Bonding pairs & lone pairs take positions as far apart as possible from each other Lone pairs take more room # e- pairs = # bonded atoms + # lone pairs Line In the same plane Dashed line Behind the plane Solid wedge In front of the plane HF 3 lone pairs __1bonding pair + __ linear Geometry =_________ BeH2 2 bonding pairs +0__ lone pairs __ linear Geometry = __________ H2 O *Lone pairs repel more strongly than bonding pairs *Lone pairs occupy more space 2 bonding pairs +2__ lone pairs __ bent Geometry = ________ BH3 __ 3 bonding pairs +0__ lone pairs Geometry = Trigonal ______________ planar NH3 *Lone pair occupies extra space 3 bonding pairs +1__ lone pair __ Geometry =Trigonal _________________ pyramidal CH4 4 bonding pairs + 0 __ __ lone pairs tetrahedral Geometry = _______________ Draw Lewis, structural & VSEPR diagram & identify the shape of the following compounds: H2Te SI2 CHCl3 PH3 CS2 CH3COH Workbook #9 p. 95 VSEPR YOGA Linear Central +1 Central + 2 No lone pairs Peripheral atoms are as far apart as possible VSEPR YOGA Bent Central +2 2 lone pairs Pushes peripheral atoms closer VSEPR YOGA Trigonal planar Central +3 No lone pairs Peripheral atoms spread out equally VSEPR YOGA Trigonal pyramidal Central +3 1 lone pair Peripheral atoms are pushed closer VSEPR YOGA Tetrahedral Central +4 No lone pairs Peripheral atoms spread out equally Workbook Practice #10
