lecture notes 12-2

lecture notes 12-2 - Nucleotides Complementary Base Pairing...

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Chapter 12 Intermolecular Forces Liquids Solids Phase Changes
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The Three Phases gas, liquid, solid
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Gases are Compressible
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Change between Phases melting boiling Sublimation: from solid to gas
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Sublimation
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Crystals, Amorphous Structures
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Intermolecular Forces: Nature is Ahead
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Different Intermolecular Forces
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Dispersion Forces Dipol Induction
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Permanent and Temporary Dipoles O H H permanent dipoles, H and O have different electronegativity Kr large atomic size, easy polarizable elctron density, temporary dipoles CH 3 CH 2 CH 2 CH 2 CH 2. ....... CH 3 H and C have similar electronegativity fairly small dipol moment can create temporary dipol moments Induced dipol moments
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Dispersion Forces, Noble Gases
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The Branching Effect
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N-Alkanes
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Dipole-Dipole Forces
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H-Bridging in Water
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Ice Formation
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We Draw H-Bridging with Dotted Lines F H O H O H H N H H
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What do We Mean with Broken Lines? H 3 C CH 3 H 2 C CH 2 HC CH single bond, ethane double bond, ethene triple bond, ethyne resonance formulation 1 1/2 bond H O H H O H hydrogen bond, less than a single bond anything in bonding less than One
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Significance of H-Bonding
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Hydrogen Bonding in Water
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Unformatted text preview: Nucleotides Complementary Base Pairing DNA Duplication Ion-Dipole Force Summary SurfaceTension Phase Changes liquid-gas equilibrium Temperature, Molecular Speed Vapor Pressure, Temperature linearization Clausius-Clapeyron Equation ln P = -! Hvap R 1 T " # $ % & + C ln P 2 P 1 = -! Hvap R 1 T 2 " 1 T 1 # $ % & ( Excel Spread Sheet-1 Spread Sheet-2 Exercise Analyze the following data! Exercise Using Two-Point Equation Methanol has a normal boiling point of 64.6 o C and a heat of vaporization ( ! H vap ) of 35.2 kJ/mol. What is the vapor pressure of methanol at 12.0 o C? 1) Sort 2) Strategize 3) Solve Temperature during Melting Cooling curve The Supercritical Point Phase Diagram We plot pressure versus temperature temperature pressure Phase Diagram Carbon Dioxide and Water Navigation (Water) Sublimation in Frozen Food Carbon Dioxide the Standard for Decaffeination...
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This note was uploaded on 04/07/2008 for the course CHEM 1B taught by Professor Schoeller during the Winter '08 term at UC Riverside.

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lecture notes 12-2 - Nucleotides Complementary Base Pairing...

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