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

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Presentation transcript:

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

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

HOW DO WE DETERMINE SHAPE? Draw Lewis dot diagrams Determine how many bonding pairs Determine how many lone pairs Use VSEPR to arrange atoms Draw structure Let’s try CCl4

VSEPR

GEOMETRY

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: Polar Covalent Bonds: Nonpolar-nonpolar Polar-depends on shape

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