Study assignment #4 key-1

Study assignment #4 key-1 - Part 1- Intermolecular Force...

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Part 1- Intermolecular Force Interactions 1) Why is boiling point of a straight chain hydrocarbon in general higher than a branch hydrocarbon of the same molecular formula? The carbon chains need to be close to each other to induce a dipole moment and cause a dispersion force interaction. The branched hydrocarbon has a lower boiling point because the branches prevent the chains from getting close to each other. Because the carbon backbones in the branched molecule cannot get as close to each other as the carbon backbone in the unbranched molecule, they have a smaller intermolecular attraction. This smaller intermolecular attraction is shown macroscopically as a lower boiling point. Trend to remember: More branches=lower boiling point 2) Hydrogen bonding is a strong intermolecular interaction that can cause atoms to pair and remain together as dimolecular species in both liquid and gas phases. Each of the following compounds exhibits this behavior. Draw the structure for each molecular diatomic using dotted-lines to indicate the hydrogen bonding interaction. a) HF b) CH 3 OH (cyclic in dimolecular form) 3) The following 3 substances are derivatives of molecules used in the production of analog videotape. C C C C O C O O H H H H C C C C O C O H H H H H H C C C C O C H O H H H a) Which of these compounds can form H bonds? Draw structures in each case for those who can.
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Hydrogen bonding can also be “intramolecular” or within the same molecule. This takes the form of a polygon with atoms as corners and bonds as sides and a hydrogen bond as one of the sides. Which of these molecules is likely to form a stable internal H bond? Draw the structure (structures with 5-6 atoms as corners are most stable) 4) Rank the following from 1 to 5 (with 5 being the lowest and 1 being the highest) in order of boiling point. CH
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This note was uploaded on 04/09/2009 for the course CHEM 151 taught by Professor Staff during the Fall '08 term at University of Arizona- Tucson.

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Study assignment #4 key-1 - Part 1- Intermolecular Force...

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