2009 Exam03v2 - CHE132S09Ex03 Multiple Choice Identify the...

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CHE132S09Ex03 Multiple Choice Identify the choice that best completes the statement or answers the question. There are 20 questions, each counting 5%, plus one challenging bonus question for a bonus 5%. . 1. Which one of the following statements regarding solubility, the enthalpy of solution ( H), and the entropy of solution ( S), is not correct? A) The solubility of a solid increases with increasing temperature when both the enthalpy of solution and the entropy of solution are positive. B) The solubility of gases generally decreases with increasing temperature because both the enthalpy of solution and the entropy of solution are negative. C) Dissolving a substance in a solvent can be either an exothermic or an endothermic process. D) The reason NaCl is very soluble in water and AgCl is insoluble is a consequence of the larger hydration energy for NaCl compared to AgCl. . E) Enthalpies of solution are the sum of lattice energies and hydration energies with the appropriate + and – signs. 2. Purveyors of salts from the Dead Sea advertise that it is healthy to bath in a saturated solution of magnesium chloride (MgCl 2 , 95.21 g/mol, K sp = 740). How much magnesium chloride would you have to purchase to make up 10.0 L of bath water saturated with magnesium chloride? A) 9.0 kg B) 12 kg C) 57 kg D) 5.4 kg E) 7.2 kg 3. This problem is from a NY Times article. Researchers tested a group of 28 doctors. The doctors were told that a five-year old child suffering a potentially fatal allergic reaction to peanuts needed an emergency injection of 0.12 mg of epinephrine. The bottles of epinephrine are labeled 10.0 mL of a 1:1000 aqueous solution. What volume of this solution would you inject if you were the doctor? A) 0.12 mL B) 1.0 mL C) 1.2 mL D) 0.00012 mL E) 10 mL
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4. Like dissolves like because __________________. A) solute molecules interact more strongly with the solvent molecules than with each other. B) solute molecules interact less stongly with the solvent molecules than with each other. C) The enthalpy of solvation is a positive, and the entropy change is negative. D) Both the enthalpy of solvation and the entropy change are negative. E) The enthalpy of solvation is small, and the entropy change is positive. . 5. What would happen to the Ag + and Cl concentrations if NaCl(s) was added to a saturated solution of AgCl in water? A) [Ag
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This note was uploaded on 04/23/2010 for the course CHE 132 taught by Professor Hanson during the Spring '08 term at SUNY Stony Brook.

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2009 Exam03v2 - CHE132S09Ex03 Multiple Choice Identify the...

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