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Published byBrian Sweeney Modified over 2 years ago

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MOLECULAR SHAPE HOW DOES SHAPE AND POLARITY DETERMINE FUNCTION AND PROPERTIES OF MOLECULES?

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VSEPR THEORY VALENCE VALENCE SHELL SHELL ELECTRON ELECTRON PAIR PAIR REPULSION 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 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

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HOW DO WE DETERMINE SHAPE? Draw Lewis dot diagrams Draw Lewis dot diagrams Determine how many bonding pairs Determine how many bonding pairs Determine how many lone pairs Determine how many lone pairs Use VSEPR to arrange atoms Use VSEPR to arrange atoms Draw structure Draw structure Lets try CCl 4 Lets try CCl 4

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VSEPR

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GEOMETRY

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WHAT IS POLARITY? Polarity depends on the type of bond and shape of molecule. Polarity depends on the type of bond and shape of molecule. Any molecule that has a net separation of charge (dipole moment) Any molecule that has a net separation of charge (dipole moment) Ionic bonds: Polar Ionic bonds: Polar Covalent Bonds: Covalent Bonds: Nonpolar-nonpolar Nonpolar-nonpolar Polar-depends on shape Polar-depends on shape

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How do we determine polarity? Determine bond type Determine bond type Determine Shape Determine Shape Draw arrows showing direction of poles Draw arrows showing direction of poles If arrows cancel each other out: NONPOLAR If arrows cancel each other out: NONPOLAR If arrows go toward one direction: POLAR If arrows go toward one direction: POLAR

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