Exp11_Prelab

Exp11_Prelab - Experiment 11 Vaporization and...

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Experiment 11 Vaporization and Intermolecular Forces
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Learning Objectives Discover how heats of vaporization ( Δ H vap ) vary with the strength of intermolecular forces between compounds. Understand that temperature changes result during vaporization due to intermolecular forces.
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Alkanes Alkanes are compounds that composed of solely carbon-carbon and carbon-hydrogen single bonds Examples: Pentane – CH 3 (CH 2 ) 3 CH 3 Ethane – CH 3 CH 3 * Note: Each line represents a C-C bond, each point connecting the lines is a carbon atom, and assume the appropriate number of hydrogen atoms is attached to each carbon atom to yield 4 bonds.
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Alcohols Alcohols are compounds that contain a hydroxyl (-OH) group Examples: Ethanol – CH 3 CH 2 -OH tert-Butanol – (CH 3 ) 3 -OH
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Structural Isomers Structural isomers are compounds that have the same molecular formula but differ in the way the atoms and bonds are arranged (aka connectivity/branching) Example – C 3 H 8 O
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Inter - vs. Intra - Molecular Forces Intermolecular Forces (IMF) Forces between molecules Weaker (< 30 kJ/mol) Includes: Ion-dipole Dipole-dipole Hydrogen Bonding Induced dipole-induced dipole (dispersion forces Intramolecular Forces Forces within a molecule Stronger (> 300 kJ/mol) Involves bond breaking and bond forming Includes: Covalent bonds Ionic bonds
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IMF: Dipoles A dipole is a state in which the electrons associated with a bond are unevenly distributed across the bonded atoms, resulting in partial charge on each
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This note was uploaded on 02/06/2010 for the course CHEM 102L taught by Professor N/a during the Spring '07 term at UNC.

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Exp11_Prelab - Experiment 11 Vaporization and...

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