Practice exam 2

# Practice exam 2 - 1 The following table of experimental...

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The following table of experimental data is necessary to answer the questions 1-5 below: For the reaction: 2ClO 2 (aq) + 2OH - (aq) → ClO 3 - (aq) + ClO 2 - (aq) + H 2 O (l) Experiment [ClO 2 ] [OH - ] Initial rate 1 0.060 M 0.030 M 0.0248 M/s 2 0.020 M 0.030 M 0.00276 M/s 3 0.020 M 0.090 M 0.00828 M/s 1.(5 pts) What is the order of the reaction with respect to ClO 2 ? a) 1 b) 0 c) 2 d) 3 e) 4 2. (5 pts) What is the order of the reaction with respect to OH - ? a) 0 b) 1 c) 2 d) 3 e) 4 3. (5 pts) What is the order of the reaction overall? a) 4 b) 0 c) 1 d) 2 e) 3 4. (5 pts) What is the value of the rate constant? a) 1.15 x 10 4 b) 4.6 c) 230 d) 115 e) 713 1

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5. (5 pts) What are the units of the rate constant for the reaction? a) M 2 s b) M 2 s -1 c) M -1 s -2 d) M -2 s -1 e) M -1 s -1 6. (7 pts) The rate constant for a particular second-order reaction is 0.476 L/mol-s. If the initial concentration of reactant is s 0.25 mol/L, it takes _______ s for the concentration to decrease to 0.13 mol/l. a) 7.8 b) 1.4 c) 3.7 d) 1.7 e) 0.13 8. (5 pts) The graph below depicts the relationship between concentration and time for the chemical reaction indicated. . The slope of this line is equal to: a) k b) -1/k c) ln[A] 0 d) –k e) 1/k 2
9. (5 pts) What is the half-life of a first-order reaction with the rate constant 0.0271 s -1 and the initial reactant concentration 0.902 M? a) 0.451 s

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## This note was uploaded on 12/10/2009 for the course CHEM 1111 at Colorado.

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Practice exam 2 - 1 The following table of experimental...

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