Workshop #1 Key

Workshop #1 Key - Names_ Everybody in your group must sign...

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1 Names_________________________________________________________________ Everybody in your group must sign their own name. Chem 104LC Workshop 1(20 points) Summer 2010 1. (3pts) What kind(s) of intermolecular forces are present in the following substances: a) NH 3 Hydrogen bonding (H + N), London. b) SF 6 London only (it is symmetrical). c) PCl 3 Dipole-dipole, London. d) LiCl Ionic, (London). e) HBr Dipole-dipole, London. f) CO 2 London only (it is symmetrical) 2. (2pts) A) Which would have a lower boiling point: O 2 or F 2 ? Explain. O2 would be lower because it is smaller. Larger atoms/molecules can have their electron clouds more easily deformed and thus have stronger London attractions and higher melting/boiling points. B) Which would have a lower boiling point: NO or O 2 ? Explain. O 2 because it has only London forces. NO has a small EN, giving it small dipoles. 3. (1pts) Which would you expect to have the higher melting point (or boiling point): C 8 H 18 or C 4 H 10 ? Explain. C
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This note was uploaded on 10/27/2010 for the course CHEM 104 taught by Professor Quigley during the Summer '08 term at CUNY Hunter.

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Workshop #1 Key - Names_ Everybody in your group must sign...

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