151F09_W11_LV_short - General Chemistry CHEM 151 Week 11 UA...

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UA GenChem General Chemistry General Chemistry CHEM 151 CHEM 151 Week 11
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UA GenChem Forces and Particles INTRA MOLECULAR Forces within the molecule. Holds atoms together Determines the electron and molecular geometries. N≡N has strong intramolecular forces INTER MOLECULAR Forces between separate molecules. The forces between many particles determine the macroscopic properties.
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UA GenChem Intermolecular Forces Molecules in a substance interact with each other via intermolecular forces. The strength of these forces depends on the nature of the atoms in the molecule and on the molecular geometry .
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UA GenChem Intermolecular forces determine properties of molecular compounds such as: boiling point, melting point, density Intermolecular Forces
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UA GenChem Intermolecular Forces Stronger intermolecula r forces: *higher melting point *higher boiling point *more energy required to separate the molecules T ( o C) -100 -50 0 50 Gas Gas Liquid Liquid Solid Solid Stronger Intermolecular Forces
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UA GenChem Dipole-Dipole Forces The intermolecular forces between molecules with permanent dipole moments (polar) are called dipole-dipole forces.
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UA GenChem Dipole-Dipole Forces In polar molecules: The larger the permanent dipole, the stronger the intermolecular forces What could you predict about the boiling point of these substances?
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UA GenChem Dipole-Dipole Forces
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UA GenChem Intermolecular Forces? Even non polar substances like helium eventually do form liquids and solids at very low temperatures. If He does not liquify until 4K (4 degrees above absolute zero) what can be said about the forces between He atoms?
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UA GenChem Let’s analyze the properties of systems composed by atoms or small, simple non polar molecules. Nitrogen
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151F09_W11_LV_short - General Chemistry CHEM 151 Week 11 UA...

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