230_F09_E2_WkSheet2 - CHEM 230 F09 Exam 2 Worksheet 2 1)...

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CHEM 230 F09 Exam 2 Worksheet 2 1) Which of the G vs T plots shown below indicates a solute that has strong interactions with the solvent? 2) At a particular concentration of solute, an ideal solution is predicated to have a pressure of 6x10 -6 atm at 300K and 7x10 6 atm at 350 K. A real salt is added to water; the solution cools, and some solid does not dissolve. The osmotic pressure is calculated to be 6x10 -6 atm at 300 K. What will the osmotic pressure be at 350 K, assuming the volume of the solution does not change? a) less than 6x10 -6 atm b) 6x10 -6 atm c) between 6x10 -6 atm and 7c10 -6 atm d) 7x10 -6 atm e) greater than 7x10 -6 3) Consider the gas-phase equilibrium A ! B. Certain amounts of A and B are mixed in a vessel. As they come to equilibrium a. the forward reaction rate declines and the reverse reaction rate rises. b. the reverse reaction rate declines and the forward reaction rate rises. c. both forward and reverse reaction rates decline. d. both forward and reverse reaction rates rise. e. either a. or b. above, but we cannot say which without more information. 4) Once the reaction quotient, Q, has been determined for a reaction mixture, comparison with the value of the equilibrium constant, K, will determine a. if the mixture is at equilibrium or not. b. if the mixture has an excess of either products or reactants compared to equilibrium. c. if the mixture will react to the left, to the right, or not at all. d. Both a and b. e. All of a, b, and c. 5) A weak acid is 5% ionized at equilibrium.
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This note was uploaded on 07/11/2011 for the course CHEM 230 taught by Professor Sharp during the Spring '08 term at University of Michigan.

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230_F09_E2_WkSheet2 - CHEM 230 F09 Exam 2 Worksheet 2 1)...

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