exp11_prelab

Exp11_prelab - Experiment 12 Vaporization and Intermolecular Forces Learning Objectives Heats of vaporization(Hvap vary with the strength of the

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Experiment 12: Vaporization and Intermolecular Forces
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Learning Objectives z Heats of vaporization ( H vap ) vary with the strength of the intermolecular forces present in various alcohol and alkane functional groups z Temperature changes occur during vaporization due to intermolecular forces
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Alkanes z Alkanes are compounds containing carbon- hydrogen single bonds z Methane, ethane, propane, butane, pentane, etc. H H H H = Methane = Ethane CH 4 CH 3 CH 3 = Heptane CH 3 (CH 2 ) 5 CH 3 *assume the appropriate number of hydrogens are attached to the carbon backbone
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Alcohols z Alcohols are compounds containing an OH group z Methanol, ethanol, propanol, butanol,etc. CH 3 OH OH CH 3 CH 2 OH OH (CH 3 ) 3 COH OH = Methanol = Ethanol = tert-Butanol
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Structural Isomers C H H H C H H C H H OH C H H H C H OH C H H H C 3 H 8 O n-propanol 2-propanol z Compounds with the same molecular formula z Differ in connectivity branching!
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Inter -vs Intra - molecular forces z Intermolecular forces (IMF) z ion-dipole z dipole-dipole z hydrogen bonds ( 20-30 kJ/mol ) z dipole - induced dipole z induced dipole induced dipole (dispersion forces) z Intact molecules breaking away from each other z Intramolecular forces z Covalent bonds z ~ 300 kJ/mol z Ionic bonds z Bond forming z Bond breaking
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What Is a Dipole? z Dipole: Charge NOT evenly distributed z The molecule has a polarity associated with it
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z Weaker than ion-dipole interactions
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This note was uploaded on 03/19/2008 for the course CHEM 102 taught by Professor Todd during the Spring '08 term at UNC.

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Exp11_prelab - Experiment 12 Vaporization and Intermolecular Forces Learning Objectives Heats of vaporization(Hvap vary with the strength of the

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