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Exset1 - Nielsen CHM1041 Question Set#1 Liquids and Solids...

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Nielsen 1 CHM1041 Question Set #1 Liquids and Solids 1. a) List the three states of matter in order of increasing intermolecular associations. b) List the three states of matter in order of increasing molecular disorder. c) Explain why the formation of solids and liquids is favored by high pressures and low temperatures. Liquid State 2. Will a substance with strong intermolecular attractions have a) a high or low vapor pressure? b) a high or low boiling point? c) a high or low heat of vaporization? 3. Explain, using a Maxwell-Boltzmann distribution curve, why an evaporating liquid becomes cool. 4. Explain why the entropy of vaporization of a compound is larger than the entropy of fusion of that compound. 5. At its normal boiling point the value of H vap of chloroform, CHCl 3 , is 247 J/g. a) What mass of CHCl 3 , in grams, can be vaporized with 4.23 kJ of heat? b) What is the V vap of CHCl 3 , expressed in kJ/mol? c) How much heat, in kJ, is evolved when 16.2 g CHCl 3 (g) condenses? 6. Explain why a burn from steam at 100ºC is more severe than a burn from the same mass of water at 100ºC. 7. a) What effect does increasing pressure have on the boiling point of a liquid? b) Will the boiling point of water be higher or lower than 100ºC on top of Mt. Everest? Explain. Solid State 8. a) Which would be more effective in cooling a drink – an ice cube at 0ºC or an equal mass of liquid water at 0ºC?
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