mq1a - 1. (5 pts) Which of the following molecules has the...

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Unformatted text preview: 1. (5 pts) Which of the following molecules has the strongest London forces? a) H 2 O b ) H C l c ) O 2 d) ClO 2 e) HClO 2. (7 pts) Which member of each of the following pairs has the stronger intermolecular forces? NH 2 NH 2 or H 2 S C F 4 or CH 2 Cl 2 XeF 2 or XeF 4 a) NH 2 NH 2 CF 4 XeF 2 b) NH 2 NH 2 CH 2 Cl 2 XeF 4 c) NH 2 NH 2 CF 4 XeF 4 d) H 2 S C H 2 Cl 2 XeF 4 e) H 2 S CF 4 XeF 2 3. (7pts) Which of the following processes is exothermic? a) A piece of dry ice (solid CO 2 ) slowly disappears at room temperature. b) Drops of water appear on the outside of a bottle taken from the refrigerator. c) Its snowing! (Water vapor changes to ice crystals.) d) A wet beach towel dries in the breeze. e) More than one of these. 4. (5 pts) Which of the following would result in a higher vapor pressure of a liquid? a) higher temperature b) larger volume of liquid c) greater surface area d) stronger intermolecular forces e) more than one of these 5. (7 pts) The vapor pressure of liquid A is 400 torr at 92C. The vapor pressure of liquid B is 400 torr at 315C. Which of the following statements is false, comparing these two liquids? a) Intermolecular forces are stronger in liquid B. b) Liquid A would evaporate faster at a given temperature. c) The critical temperature is higher for liquid B. d) Liquid A has a higher normal boiling point. e) The heat of vaporization is higher for B. 6. (7 pts) Liquid bromine, Br 2 , has a vapor pressure of 400 torr at 41.0C and a normal boiling point of 58.2C. Calculate the heat of vaporization of bromine. a) 25.8 kJ/mol b) 29.1 kJ/mol c) 32.3 kJ/mol d) 35.6 kJ/mol e) 39.2 kJ/mol (1) 7. (5 pts) For formic acid, the heat of vaporization is 41.4 kJ/mol and the heat of sublimation is 60.4 kJ/mol. Estimate the heat of fusion for formic acid in kJ/mol. a) +19.0 b) ! 19.0 c) +50.9 d) +101.8 e) ! 101.8 To answer questions 8 and 9, use the information below to sketch a phase diagram for methane, CH 4 ....
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mq1a - 1. (5 pts) Which of the following molecules has the...

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