CHM2046Exam 1+Answers

CHM2046Exam 1+Answers - Page 1 Version 1 CHM 2046 Exam 1 1....

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Page 1 Version 1 CHM 2046 Exam 1 1. A 0.100 m solution of which one of the following solutes will have the lowest vapor pressures? a. KClO 4 b. Ca(ClO 4 ) 2 c. Al(ClO 4 ) 3 d. CH 3 OH e. NaCl c. Al(ClO 4 ) 3 dissociates into 4 particles, yielding the highest molality of particles. 2. On a phase diagram, the critical temperature is ____________. a. the temperature below which a gas cannot be liquefied b. the temperature required to melt a solid c. the temperature at which all three states are in equilibrium d. the temperature above which a gas cannot be liquefied e. the temperature required to cause sublimation of a solid d. definition of critical temp. molecules have too much energy to enter the liquid phase regardless of the pressure. 3. A solution was prepared by dissolving calcium chloride in water and diluting to 500.0 mL. If this solution contained 44 ppm chloride ions, the concentration of calcium ions was __________ ppm. a. 500 b. 88 c. 11 d. 22 e. 44 d. there are two Cl ions for every Ca ion and masses are close to equal. 4. __________ is the energy required to expand the surface area of a liquid by a unit amount of area. a. Volatility b. Viscosity c. Meniscus d. Surface tension e. Capillary action d. Surface tension definition. Surface tension relates to how tightly the molecules tend to draw together, so the energy required to force them apart (flatten) is surfac tension.
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5. How much energy is required to convert a 6.5 g ice cube at -10.0 ø C to water vapor at 150 ø C? (Specific heats of ice, water, and steam are 2.09 J/g-K, 4.18 J/g-K, and 1.84 J/g-K, respectively. Ü H fus = 6.01 kJ/mol, and Ü H vap = 40.67 kJ/mol.) a. 17.05 b. 203.07 c. 478.40 d. 20.31 e. 3467.71 d. K
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This document was uploaded on 11/02/2011 for the course CHM 8227 at University of Florida.

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CHM2046Exam 1+Answers - Page 1 Version 1 CHM 2046 Exam 1 1....

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