CHAPT11_1 - Chapter 11 Kinetic Molecular Description of...

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Mary J. Bojan Page 1 BLB Chapter 11 Chapter 11 Kinetic Molecular Description of Liquids and Solids Noncovalent Forces Intermolecular interactions Electrostatic Forces Dispersion Forces H-bonding DNA, RNA
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Mary J. Bojan Page 2 BLB Chapter 11 Kinetic Molecular Description of Liquids and Solids gas: Kinetic energy >> intermolecular forces liquid: Kinetic energy intermolecular forces solid: Kinetic energy << intermolecular forces Kinetic Energy T Heating: T , KE solid liquid gas
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Mary J. Bojan Page 3 BLB Chapter 11 Non covalent Interactions chemical bonds 150-1100 kJ/mol intermolecular (IM) forces 1-50 kJ/mol Relative strengths of intermolecular forces can be seen experimentally : higher boiling point (or melting point) higher intermolecular forces due to electrostatic attraction increases as intermolecular distances decrease Strength of IM forces depends on: Q charge on ion μ dipole moment α polarizability α - polarizability: ease with which electrons clouds become distorted α increases as number of electrons increases α increases as size (MW) increases
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Mary J. Bojan Page 4 BLB Chapter 11 TYPES OF INTERMOLECULAR FORCES Depends on Ion-Ion Q ionic bond Ion-Dipole Q , μ Ions in aqueous solutions of
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This note was uploaded on 04/16/2009 for the course CHEM 110 taught by Professor Hofmann,brucerob during the Fall '08 term at Penn State.

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CHAPT11_1 - Chapter 11 Kinetic Molecular Description of...

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