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

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Page 1: MOLECULAR SHAPE HOW DOES SHAPE AND POLARITY DETERMINE FUNCTION AND PROPERTIES OF MOLECULES?

MOLECULAR SHAPEMOLECULAR SHAPE

HOW DOES SHAPE AND HOW DOES SHAPE AND POLARITY DETERMINE POLARITY DETERMINE

FUNCTION AND PROPERTIES FUNCTION AND PROPERTIES OF MOLECULES?OF MOLECULES?

Page 2: MOLECULAR SHAPE HOW DOES SHAPE AND POLARITY DETERMINE FUNCTION AND PROPERTIES OF MOLECULES?

VSEPR THEORYVSEPR THEORY

VVALENCEALENCE SSHELLHELL EELECTRONLECTRON PPAIRAIR RREPULSIONEPULSION Predicts the shape of molecules and ions in Predicts the shape of molecules and ions in

which valence shell electron pairs are arranged which valence shell electron pairs are arranged about each atom so that they are kept as far about each atom so that they are kept as far away as possible, thus minimizing electron-pair away as possible, thus minimizing electron-pair repulsionrepulsion

Page 3: MOLECULAR SHAPE HOW DOES SHAPE AND POLARITY DETERMINE FUNCTION AND PROPERTIES OF MOLECULES?

HOW DO WE DETERMINE HOW DO WE DETERMINE SHAPE?SHAPE?

Draw Lewis dot diagramsDraw Lewis dot diagramsDetermine how many bonding pairsDetermine how many bonding pairsDetermine how many lone pairsDetermine how many lone pairsUse VSEPR to arrange atomsUse VSEPR to arrange atomsDraw structureDraw structureLet’s try CClLet’s try CCl44

Page 4: MOLECULAR SHAPE HOW DOES SHAPE AND POLARITY DETERMINE FUNCTION AND PROPERTIES OF MOLECULES?

VSEPRVSEPR

Page 5: MOLECULAR SHAPE HOW DOES SHAPE AND POLARITY DETERMINE FUNCTION AND PROPERTIES OF MOLECULES?

GEOMETRYGEOMETRY

Page 6: MOLECULAR SHAPE HOW DOES SHAPE AND POLARITY DETERMINE FUNCTION AND PROPERTIES OF MOLECULES?

WHAT IS POLARITY?WHAT IS POLARITY?

Polarity depends on the Polarity depends on the type of bondtype of bond and and shapeshape of molecule.of molecule.

Any molecule that has a Any molecule that has a net separation of charge net separation of charge (dipole moment)(dipole moment)

Ionic bonds: PolarIonic bonds: Polar Covalent Bonds:Covalent Bonds:

Nonpolar-nonpolarNonpolar-nonpolar Polar-depends on shapePolar-depends on shape

Page 7: MOLECULAR SHAPE HOW DOES SHAPE AND POLARITY DETERMINE FUNCTION AND PROPERTIES OF MOLECULES?

How do we determine polarity?How do we determine polarity? Determine bond typeDetermine bond type Determine ShapeDetermine Shape Draw arrows showing direction of polesDraw arrows showing direction of poles If arrows cancel each other out: If arrows cancel each other out: NONPOLARNONPOLAR If arrows go toward one direction: If arrows go toward one direction: POLARPOLAR


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