Lecture 17_2 slides per page - Lecture17 CHMY141 Spring2016...

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2/26/2016 1 Lecture 17 CHMY 141 Spring 2016 Molecular Shapes The three dimensional shapes of molecules are used to predict several important properties Solubility Drug interaction The method used is called Valence Shell Electron Pair Repulsion (VSEPR)
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2/26/2016 2 VSEPR Used to predict molecular geometry and bond angles Central idea is that valence electron pairs determine shape by repelling other electron pairs We will work primarily with molecules that have a central atom Molecular Geometry When determining molecular geometry we need to look at: Lewis dot structure Number of electron pairs around the central atom These determine where bonds or lone pairs will form in the molecule These determine the shape!
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2/26/2016 3 Determining Molecular Geometry Steps to follow: 1. Draw the correct Lewis structure 2. Determine the number of electron groups around the central atom (Bonding groups or lone pairs) Any type of bond counts as only one group 3. Determine the number of lone pairs around the central atom 4. Find the molecular geometry
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