Chapter 13
1. For the reaction , the rate of formation of CO2 is equal to:
a. d.
b. e.
c.
2. HI dissociates to form I2 and H2: .
If the concentration of HI changes at a rate of 0.45 M/s, what is the rate of appearance of I2(g)?
a. 0.90 M/s d. 1.0 M/s
b. 0.45 M/s e. 0.13 M/s
c. 0.23 M/s
3. Determine the overall order of the reaction from the following data.
Experiment [NO] (M) [Cl2] (M) Rate (M/s)
1 0.0300 0.0100 3.4 104
2 0.0150 0.0100 8.5 105
3 0.0150 0.0400 3.4 104
4.
a. first d. three-halves
b. second e. fourth
c. third
5. Determine the overall order of the reaction from the following data:
Experiment P(CH3CHO) (mtorr) Rate (mtorr/sec)
1 25.0 45.6
2 12.5 16.0
6.
a. one-half d. three-halves
b. first e. third
c. second
6. Nitrogen dioxide undergoes thermal decomposition according to the second-order reaction . When 0.500 M NO2 is allowed to react for 90.0 seconds,
its concentration falls to 0.0196 M. What is the rate constant for the reaction?
a. 0.00534 M1s1 d. 0.0214 M1s1
b. 0.589 M1s1 e. 0.0231 M1s1
c. 0.545 M1s1
7. The initial rate data for the reaction is shown in the following table. Determine the value of the rate constant for this reaction.
Experiment [N2O5](M) Rate (M/s)
1 2.56 103 450.
2 1.28 102 22.5
a. 4.09 s1 d. 0.225 s1
b. 0.176 s1 e. 80.1 s1
c. 0.0569 s1
8. A particular reaction has an activation energy, Ea, of 175 kJ/mol. If the rate constant for the reaction is 0.00205 M 1 s 1 at 457 C, what is the value of the rate constant at 569 C?
a. 1.95 107 M 1 s 1 d. 0.0949 M 1 s 1
b. 4.43 105 M 1 s 1 e. 17.7 M 1 s 1
c. 0.00206 M 1 s 1
CHAPTER 14
1. Write the equilibrium expression for the reaction .
a. d.
b. e.
c.
2. For the equilibrium , the concentrations at equilibrium are
[CH4] 0.3322 M, [H2S] 0.6644 M, [CS2] 0.0678 M, and [H2] 0.2712 M at 1400.0 K. Calculate Kc.
a. 0.167 d. 6.00
b. 2.50 103 e. 0.694
c. 4.00 102
3. For the equilibrium , Kc 4.96 1011 at 253 K. What is Kc for the equilibrium ?
a. 7.04 105 d. 1.01 1012
b. 2.02 1012 e. 1.42 106
c. 9.90 1011
4. For the equilibrium , Kc 0.0776 at 873 K. What is Kp at 873 K for the equilibrium ?
a. 7.36 d. 0.182
b. 0.136 e. 40.4
c. 2.34
5. HIO3 behaves as acid in water: , with Kc 0.17 at 25C. What is the H concentration in a solution that is initially 0.50 M HIO3?
a. 0.22 M d. 0.29 M
b. 0.17 M e. 0.34 M
c. 0.28 M
6.
For the reaction , Kc 1.7 107 at 800.0C. If the initial concentration of H2S in a closed container is 0.75 M, what is the approximate equilibrium concentration of H2?
a. 0.37 M d. 5.8 103 M
b. 3.2 103 M e. 2.9 103 M
c. 6.3 103 M
7. Given the following two measurements of the equilibrium constant for a reaction, calculate H for the reaction.
T, C K
15.0 0.032
25.0 93
a. 127 kJ/mol d. 127 kJ/mol
b. 0.621 kJ/mol e. 0.621 kJ/mol
c. 16.0 kJ/mol
8.
8. Consider the equilibrium . Which of the following disturbances will NOT cause the system to shift to the right to reestablish equilibrium?
a. The partial pressure of CH4 increases.
b. The partial pressure of CO decreases.
c. The volume decreases.
d. The temperature increases.
e. All of these will cause the system to shift to the right.
9. If the temperature of an endothermic reaction at equilibrium could be increased instantaneously, what would be the instantaneous effect on Q and K before equilibrium was again achieved?
a. Q would increase and K would stay the same.
b. Q would decrease and K would stay the same.
c. Q would stay the same and K would increase.
d. Q would stay the same and K would decrease.
e. Both Q and K would stay the same.
10. For the reaction , Kc 1.7 107 at 800.0C. If the initial concentration of H2S in a closed container is 0.75 M, what is the approximate equilibrium concentration of H2?
a. 0.37 M d. 5.8 103 M
b. 3.2 103 M e. 2.9 103 M
c. 6.3 103 M
CHAPTER 15
1. Which of the following is a strong base?
a. CH3NH2 d. Cr(OH)3
b. Ba(OH)2 e. CH3COOH
c. H2O2
2. In the following reaction in aqueous solution, the acid reactant is ________ and its conjugate base product is ________.
a. CH3NH2; CH3NH3 d. HSO4; SO42
b. CH3NH2; SO42 e. HSO4; H3O
c. HSO4; CH3NH3
3. Which of the following is a conjugate acid-base pair?
a. H3PO4 and HPO42 d. OH and H3O
b. H2 and H e. H2PO4 and PO43
c. CO32 and H2CO3
4. The pH of a popular soft drink is 3.40; what is its hydronium ion concentration?
a. 5.0 104 M d. 1.0 107 M
b. 4.0 104 M e. 5.0 105 M
c. 2.5 103 M
5. A cup of coffee has a hydroxide ion concentration of 1 1010 M. What is the pH of this coffee?
a. 1.0 104 d. 7.0
b. 4.0 e. 10.0
c. 10.0
6. What is the percent dissociation of 0.40 M butyric acid (HC4H7O2)? (The Ka value for butyric acid is 1.48 105.)
a. 0.24% d. 3.7 103%
b. 0.96% e. 0.61%
c. 6.1 103%
7. What is the pH of a 0.010 M acetic acid solution? (Ka for acetic acid 1.76 105)
a. 2.00 d. 3.38
b. 4.74 e. 6.74
c. 2.74
8. What is the pH of a 0.20 M ammonia solution? (Kb value for ammonia 1.8 105)
a. 11.28 d. 9.56
b. 9.26 e. 2.72
c. 4.74
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