CH13 II and 14 Zumdahl 2008 for Web [Compatibility Mode]

CH13 II and 14 Zumdahl 2008 for Web [Compatibility Mode] -...

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Next: Chapter 13-II to 14 What is the true shape of BF ? 3
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HAPTERS 13/14 CHAPTERS 13/14 Molecular Structure & Covalent Bonding heories Theories ¾ Valence Shell Electron Pair Repulsion Theory ¾ Polar Molecules: The Influence of Molecular shape ¾ Valence Bond (VB) Theory = Localized Electron odel Model Molecular Shapes and Bonding ¾ Molecular orbitals
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± Six “Electron Arrangements”: ± Linear ± Trigonal Planar ± Tetrahedral ± rigonal Bipyramidal Trigonal Bipyramidal ± Octahedral ± entagonal Bipyramidal Pentagonal Bipyramidal ± Compounds Containing Double Bonds ± Compounds Containing Triple Bonds ± Summary of Electronic Arrangements and Molecular Shapes
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What is the shape of BF 3 ?
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The six electronic arrangements
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ll the molecular shapes…. . All the molecular shapes….
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wo Simple Theories of Covalent Two Simple Theories of Covalent Bonding • Valence Shell Electron Pair Repulsion Theory – Commonly designated as VSEPR • R. J. Gillespie in the 1950’s • Valence Bond Theory = Localized lectron Model Electron Model – Involves the use of hybridized atomic rbitals orbitals • L. Pauling in the 1930’s & 40’s
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Predicting molecular structures: The Strategy raw the correct Lewis dot structure 1. Draw the correct Lewis dot structure . • Identify the central atom. esignate the bonding pairs and lone pairs of Designate the bonding pairs and lone pairs of electrons on central atom. 2. Count the regions of “high electron density” (HED) on the central atom. Each lone pair on the central atom is one HED. Each atom bonded to the central atom is one HED.
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etermine the lectronic 3. Determine the electronic arrangement around the central atom. ao VSEPR is a guide to the arrangement. 4. Determine the molecular shape around the central atom. Ignore the lone pairs of electrons. djust molecular shape for the effect 5. Adjust molecular shape for the effect of any lone pairs (repulsions).
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. etermine the ybrid orbitals n 6. Determine the hybrid orbitals on the central atom. 7. Repeat procedure if there is more an one central atom in the than one central atom in the molecule. 8. Determine molecular polarity from entire molecular shape using lectronegativity differences and electronegativity differences and symmetry.
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Counting regions of HIGH ELECTRON DENSITY
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Counting regions of HIGH ELECTRON DENSITY
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Counting regions of HIGH ELECTRON DENSITY
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SEPR Theory: VSEPR Theory: Geometries/Shapes Main guiding principle: Regions of high electron density around the central atom are arranged as far apart as possible to minimize repulsions . • There are six basic electronic arrangements based on the number of regions of high electron density around the central atom.
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VSEPR Theory Two regions of high electron ensity around the central atom density around the central atom.
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CH13 II and 14 Zumdahl 2008 for Web [Compatibility Mode] -...

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