Exam 2_120A_Aut11 - key

Exam 2_120A_Aut11 - key - Name: _ CHEM 120A, Exam 2, Nov....

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Name: __________________________ CHEM 120A, Exam 2, Nov. 21, 2011 1. Multiple choice (21 pts total, 3 pts each). Clearly mark your answer. Choose only one answer for each question. (1) At STP, temperature and pressure have the values of a. 0 K and 1 atm b. 273 K and 1 mmHg c. 273 K and 760 mmHg d. 0 K and 760 mmHg e. 760 K and 273 atm (2) In water, a substance that partially ionizes in solution is called a a. Weak electrolyte b. Nonelectrolyte c. Semiconductor d. Nonconductor e. Strong electrolyte (3) If atmospheric pressure on a certain day is 749 mmHg, what is the partial pressure of nitrogen, given that nitrogen is about 78% of the atmosphere? a. 165 mmHg b. 584 mmHg c. 600 mmHg d. 749 mmHg e. 760 mmHg (4) The solubility of KF is 92 g in 100 g of H 2 O at 18°C. If 48 g of KF are added to 50 g of H 2 O, a. All of the KF will dissolve b. The solution will freeze c. The solution will start boiling d. A saturated solution will form e. The solution will be unsaturated
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(5) If the reaction shown below is exothermic, the energy level of the reactants is ________. H 2 + O 2 2H 2 O a. Lower than that of the products b. Higher than that of the products c. The same as that of the products d. Possibly lower, possibly higher than that of the products e. Higher than the activation energy of the reaction. (6) How many equivalents are present in 5.0 moles of Al 3+ ? a. 15 Eq b. 1.3 Eq c. 5.0 Eq d. 0.67 Eq e. 3.0 Eq (7) An aqueous mixture containing starch (a colloid), NaCl, glucose and albumin (a colloid) is placed in a dialyzing bag and immersed in distilled water. Which of the following
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Exam 2_120A_Aut11 - key - Name: _ CHEM 120A, Exam 2, Nov....

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