Chem 1412 Exam 2b

Chem 1412 Exam 2b - Chem 1412 Exam 2b Student: _ 1. For the...

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Chem 1412 Exam 2b Student: ___________________________________________________________________________ 1. For the reaction BrO 3 - + 5Br - + 6H + 3Br 2 + 3H 2 O at a particular time, - [BrO 3 - ]/ t = 1.5 × 10 -2 M/s. What is - [Br - ]/ t at the same instant? A.13 M/s B.7.5 × 10 -2 M/s C.1.5 × 10 -2 M/s D.3.0 × 10 -3 M/s E.330 M/s 2. For the overall chemical reaction shown below, which one of the following statements can be rightly assumed? 2H 2 S(g) + O 2 (g) 2S(s) + 2H 2 O(l) A.The reaction is third-order overall. B.The reaction is second-order overall. C.The rate law is, rate = k[H 2 S] 2 [O 2 ]. D.The rate law is, rate = k[H 2 S] [O 2 ]. E.The rate law cannot be determined from the information given. 3. The reaction A + 2B products was found to follow the rate law, rate = k[A] 2 [B]. Predict by what factor the rate of reaction will increase when the concentration of A is doubled, the concentration of B is tripled, and the temperature remains constant. A.5 B.6 C.12 D.18 E.none of these 1
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4. The data below were determined for the reaction S 2 O 8 2- + 3I - (aq) 2SO 4 2- + I 3 - . The rate law for this reaction must be: A.rate = k[S 2 O 8 2- ][I - ] 3 . B.rate = k[S 2 O 8 2- ]. C.rate = k[S 2 O 8 2- ] 2 [I - ] 2 . D.rate = k[I - ]. E.rate = k[S 2 O 8 2- ][I - ]. 5. A first-order reaction has a rate constant of 3.00 × 10 -3 s -1 . The time required for the reaction to be 75. 0% complete is A.95.8 s. B.462 s. C.231 s. D.201 s. E.41.7 s. 6. The isomerization of cyclopropane to form propene is a first-order reaction. At 760 K, 85% of a sample of cyclopropane changes to propene in 79.0 min. Determine the rate constant for this reaction at 760 K. A.3.66 × 10 -2 min -1 B.1.04 × 10 -2 min -1 C.2.42 min -1 D.2.06 × 10 -3 min -1 E.2.40 × 10 -2 min -1 2
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7. Benzoyl chloride, C 6 H 5 COCl, reacts with water to form benzoic acid, C 6 H 5 COOH, and hydrochloric acid. This first-order reaction is 25% complete after 26 s. How much longer would one have to wait in order to obtain 99% conversion of benzoyl chloride to benzoic acid? A.390 s
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Chem 1412 Exam 2b - Chem 1412 Exam 2b Student: _ 1. For the...

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