Presentation on theme: "MOLECULAR SHAPE HOW DOES SHAPE AND POLARITY DETERMINE FUNCTION AND PROPERTIES OF MOLECULES?"— Presentation transcript:
1 MOLECULAR SHAPEHOW DOES SHAPE AND POLARITY DETERMINE FUNCTION AND PROPERTIES OF MOLECULES?
2 VSEPR THEORY VALENCE SHELL ELECTRON PAIR REPULSION Predicts the shape of molecules and ions in which valence shell electron pairs are arranged about each atom so that they are kept as far away as possible, thus minimizing electron-pair repulsion
3 HOW DO WE DETERMINE SHAPE? Draw Lewis dot diagramsDetermine how many bonding pairsDetermine how many lone pairsUse VSEPR to arrange atomsDraw structureLet’s try CCl4
6 WHAT IS POLARITY?Polarity depends on the type of bond and shape of molecule.Any molecule that has a net separation of charge (dipole moment)Ionic bonds: PolarCovalent Bonds:Nonpolar-nonpolarPolar-depends on shape
7 How do we determine polarity? Determine bond typeDetermine ShapeDraw arrows showing direction of polesIf arrows cancel each other out: NONPOLARIf arrows go toward one direction: POLAR