chm115_lecture18

chm115_lecture18 - Chemistry 115 Lecture 18 Outline Chapter...

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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 non-bonded electrons: Two - Linear Three - Trigonal Planar Four - Tetrahedral Five - Trigonal Bipyramidal Six - Octahedral We assign a specific class designation: AX m E n , where A is the central atom, X is a surrounding atom, and E is a lone pair (or single non-bonded electron). 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. 2....
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chm115_lecture18 - Chemistry 115 Lecture 18 Outline Chapter...

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