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Intermulecular Forces, Liquids and Solids Notes

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Problem Set intermolecular Forces 1). Circle the structural formulas of all of the molecules below that will have hydrogen bonding interactions in the pure substance. (More than one answer may be correct.) H⎯P⎯H | H F⎯N=O H | H⎯C⎯N⎯H | | H H H⎯O⎯O⎯H H H⎯C⎯N=O H⎯F H O 2). What types of intermolecular interactions are found in liquid CO? 3). Rank the following substances in order of increasing boiling point: (a) Ne, (b) CH3OH , and (c) SO2. _____________________________________________ lowest boiling point highest boiling point 4). Which of the following compounds would be expected to form intermolecular hydrogen bonds with water? Drawing and model of the structure of aspirin. 5). For each compound, state what type of intermolecular forces exist between two molecules of that substance. (Choices are dipole-dipole, hydrogen bonds, or London Dispersion). 6). Rank the following molecules in order of increasing intermolecular forces: CH3Cl, HCO2H ( formic acid), and CO2. 7). Predict which substance in each of the following pairs would have the greater intermolecular forces. Circle your answer. The polar molecule has stronger IM forces. (Hint Draw the molecular geometry first). a. CO2 or OCS b. PF3 or PF4+ c. CH3OH or CH2O d. SO3 or SO2 Answers: 1). H | H⎯C⎯N=O | | H O H⎯F H⎯O⎯O⎯H H⎯P⎯H | H H | H⎯C⎯N⎯H | | H H F⎯N=O 2). dispersion, dipole-dipole 3). A ...
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