Chpt%2012%20More%20Intermolecular%20Forces%20Answers - 3 CH...

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CHEM 1212 More Intermolecular Forces Classify the most prevalent type of IM force that would be present among each of the following (consider each one as it relates to another identical molecule): 1. CH 2 CH 2 LDF (this would have to be an alkene) 2. CH 3 COH Dipole-dipole (this would have to be an aldehyde) 3. CH 3 CH 2 OH H-bond (this would have to be an alcohol) 4. For the molecules in 1 through 3, identify the type of organic functional group that is present in each. See above 5. Arrange the molecules 1 through 3 in terms of: Increasing ΔH vap : CH 2 CH 2 < CH 3 COH < CH 3 CH 2 OH Increasing Vapor Pressure: CH 3 CH 2 OH < CH 3 COH < CH 2 CH 2 Increasing Boiling Point: CH 2 CH 2 < CH 3 COH < CH
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Unformatted text preview: 3 CH 2 OH 6. Using your knowledge of IM Forces, consider pure water and pure water with NaBr dissolved in it. Which would you expect to have a higher vapor pressure? Which would you expect to have a higher boiling point? Pure water would have a higher vapor pressure. By dissolving NaBr in water, you are making the strongest IM force to be ion-dipole, instead of the H-bond. Since strong IM forces have low vapor pressure, water with NaBr has a lower vapor pressure than pure water. Strong IM forces relate to higher boiling points, so that water with NaBr will have the higher boiling point....
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