L7 - Liquids exist because of intermolecular attractions...

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Lecture 7 Attractive Molecules : Liquids and Solutions Key Idea: Liquids exist because of intermolecular attractions To learn about intermolecular interactions, you can look at the boiling point of various liquids. The stronger the dipole moment, the higher the boiling point! WHY? Liquids exist because of intermolecular attractions + ! - ! + ! - ! 1. Dipole-Dipole + ! - ! + ! - ! These attractions are similar to charge-charge attraction but weaker and effective over shorter distances . + _ Question : Which of these isomers of dichlorobenzene has a higher boiling point ? A: B: Boiling temperature 174 o C 180 o C But why is liquid? One of these isomers does not have a dipole moment! 2. London Dispersion Forces: Induced-dipole – induced-dipole interactions no permanent dipole moment induced dipole moment
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+ ! - ! + ! - ! + ! - ! + ! - ! London Dispersion Forces: Electrostatic attractive interactions between momentary dipoles created by correlated fluctuations of electron in neighboring molecules
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This note was uploaded on 06/03/2008 for the course CHEM 1A taught by Professor Nitsche during the Fall '08 term at University of California, Berkeley.

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L7 - Liquids exist because of intermolecular attractions...

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