winter 08 exam 2

winter 08 exam 2 - CHEM 102 Winter 08 Exam 2 On the answer...

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CHEM 102 Winter 08 Exam 2 On the answer sheet (scantron) write your Name, Student ID Number, and Recitation Section Number. Choose the best (most correct) answer for each question AND ENTER IT ON YOUR ANSWER SHEET. Potentially useful information: a c a b b x 2 4 2 ± = 1. If a reaction is first-order with respect to each of its two reactants, then the rate of the reaction is a. inversely proportional to the concentration of each reactant. b. directly proportional to the concentration of one reactant and inversely proportional to the concentration of the other reactant. c. unaffected by concentration as long as the concentrations of the two reactants are always equal to one another. d. directly proportional to the concentration of each reactant. ANSWER: d 2. The units for the rate constant k must always include a. a volume unit. b. a concentration unit. c. a time unit. d. all of the above. ANSWER: c 3. The rate law for a given reaction is rate = k[reactant] 2 , with k = 2.64 × 10 -4 M -1 min -1 . If the initial concentration is 0.0250 M, what is the initial rate, with the correct units? a. 1.65 × 10 -7 min -1 b. 6.60 × 10 -6 M min -1 c. 1.65 × 10 -7 M min -1 d. 6.60 × 10 -6 min -1 ANSWER: c 4. If the initial concentration of the reactant in a first-order reaction is 0.028 mol/L and the half life is 25 s, how long would it take for the concentration to decrease to 3.5 × 10 -3 M? a. 25 s b. 35 s c. 50 s d. 75 s ANSWER: d Page 1 of 5
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5. From the stoichiometry of the reaction 2 I - (aq) + H 2 O 2 (aq) + 2 H 3 O + (aq) I 2 (s) + 4 H 2 O(l) the rate law a. is predicted to be third-order overall. b.
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winter 08 exam 2 - CHEM 102 Winter 08 Exam 2 On the answer...

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