gen chem 2 exam 2 practice probs

gen chem 2 exam 2 practice probs - CHEM 102 Winter 08 Exam...

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CHEM 102 – Winter 08 Exam 2 Review Practice Problems 1) In the reaction 2A + B 2C + D, - Δ [A]/ Δ t is found to be 5.0 M · min 1 . What is the rate of reaction of B? A) 2.5 B) 5.0 C) 10 D) 75 E) Additional information is required. Answer: A 2) The half-life of cesium-130 is 30 minutes. What percentage of the initial activity will be present after 2.0 hours, assuming radioactive decay occurs by a first order rate mechanism? A) 50 B) 25 C) 12.5 D) 6.25 E) 3.13 Answer: D 3) For first-order reactions, the rate constant, k, has the units A) time. B) time 1 . C) mol L 1 time 1 . D) time mol L 1 . E) L mol 1 . Answer: B 4) What is the rate law for the reaction of hydrogen gas and chlorine gas to form HCl? A) rate = k [H 2 ] [Cl 2 ] B) rate = k [H 2 ] C) rate = k [H 2 ] 2 [Cl 2 ] 2 D) rate = k [H] [Cl] E) The rate law cannot be determined without experimentation. Answer: E 5) The reaction 2 O 3 (g) 3 O 2 (g) is second order in O 3 , and the order with respect to O 2 is found to be 1. The rate constant is 2.6 × 10 4 s 1 at a certain temperature. What is the rate of the reaction if [O 3 ] = 1.1 × 10 3 M and [O 2 ] = 3.4 × 10 2 M? A) 0.97 M s -1 B) 0.93 M s -1 C) 840 M s -1
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D) 1.1 × 10 3 M s -1 E) 2.6 × 10 4 M s -1 Answer: B 6) For first order reactions the slope of a plot of ln [A] vs. time is A) k. B) -k.
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This note was uploaded on 05/13/2008 for the course CHEM 102 taught by Professor Multipleprofs during the Winter '08 term at Drexel.

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gen chem 2 exam 2 practice probs - CHEM 102 Winter 08 Exam...

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