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Unformatted text preview: Chemistry 115 Lecture 18 Outline Chapter 8 Review VSEPR Molecular shape and polarity HW 8 Due Friday March 25, 11 pm. Recitation: Electronegativity VSEPR, molecular shapes Molecular polarity VSEPR theory If 2, 3, 4, 5, 6 objects attached at a central point and maximize the space around them, they form 5 different geometric patterns. The electron group patterns are the following, and depend on both bonded and nonbonded electrons: Two  Linear Three  Trigonal Planar Four  Tetrahedral Five  Trigonal Bipyramidal Six  Octahedral m n The Bond Angle is defined by the angle between two surrounding atoms and the central atom. These are idealized bond angles, and are not exactly the same for different surrounding atoms. Molecular shapes depend on what is bonded, so that the same electron group arrangement can have different molecular shapes. Once we get beyond 3 groups, it takes three dimensional shapes to move pairs of electrons (lone pairs and bonding pairs) as far apart as possible two three four five six Electron Group Arrangements When all of these electron pairs are bonding pairs (connect atoms), the Electron Group Arrangements correspond to Molecular Shapes two three four five six From Lewis Dots to Molecular Shape using VSEPR Theory Steps: 1. Write the formula 2. Identify the central atom(s) 3. Draw the Lewis Structure 4. Count the Electron Groups around the central atom(s) 5. Assign the Electron Group arrangement (AX...
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This note was uploaded on 04/09/2011 for the course CHM 115 taught by Professor Towns during the Spring '08 term at Purdue.
 Spring '08
 Towns
 Chemistry, Electron, Mole, VSEPR

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