9_Chapt11 - Chapter 11 Kinetic Molecular Description of...

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Chapter 11 Kinetic Molecular Description of Liquids and Solids Noncovalent Forces Intermolecular interactions Electrostatic Forces Dispersion Forces H-bonding DNA, RNA 1 Mary J. Bojan Chem 110
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Kinetic Molecular Description of Liquids and Solids gas: Kinetic energy >> intermolecular forces Liquid: Kinetic energy ! intermolecular forces Solid: Kinetic energy << intermolecular forces 2 Kinetic Energy " T Heating: T # , KE # solid $ liquid $ gas Mary J. Bojan Chem 110
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States of Matter 3 The state a substance is in at a particular temperature and pressure depends on two antagonistic entities: The kinetic energy of the particles The strength of the attractions between the particles Mary J. Bojan Chem 110
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Non covalent Interactions Relative strengths of intermolecular forces can be seen experimentally : higher boiling point (or melting point) ! ____________ intermolecular interactions IM FORCES: due to electrostatic attraction increase as intermolecular distances ________________ Strength of: chemical bonds intermolecular (IM) forces 4 Mary J. Bojan Chem 110
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Intermolecular (IM) Forces Strength of IM forces depends on: Q charge on ion μ dipole moment % Polarizability 5 % - polarizability: ease with which electron clouds become distorted % increases as number of electrons increases % increases as size (MW) increases Mary J. Bojan Chem 110
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9_Chapt11 - Chapter 11 Kinetic Molecular Description of...

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