post8A2009lecture5

post8A2009lecture5 - Lecture 5 Organic Chemistry Brief 8A...

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Lecture 5 Organic Chemistry Brief 8A
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Properties of Alkanes -Nonpolar nature of alkane results in weak interactions between alkanes -Main interactions are London forces/Van Der Waals interactions--also called induced-dipole-induced- dipole interactions These interactions increase with MW and surface area-- Larger molecules-stronger interaction with themselves. Property is reflected in whether the pure alkane is a gas/liquid/solid
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Physical state Methane, ethane, propane, butane 5-15 carbons > 16 carbons At RT Gases Liquids Waxy solids
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Boiling Points -Increase length (# of Cs)-- increased boiling point e. g. natural gas C1-C4 bp < 20 ° C gasoline C6-C12 bp 50-200 ° C kerosene C12-C18 bp 175-275 ° C -Packing of alkanes on each other affects bp if same number
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Which of the following has the compounds listed in the correct order of decreasing boiling point? 1 . 2. 3. 4. CH 3 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 3 CH 3 CHCH 2 CH 2 CH 2 CH 2 CH 3 CH 3 CH 3 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 3 C C CH 3 H 3 C CH 3 CH 3 CH 3 CH 3 A. 1, 2, 3, 4 B. 3,4,1, 2 C. 4, 3, 1, 2 D. 4, 3, 2, 1
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Other Properties of Alkanes
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post8A2009lecture5 - Lecture 5 Organic Chemistry Brief 8A...

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