Chapter 14

Chapter 14 - Chapter 14: Chemical Equilibrium 1. The...

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Page 260 Chapter 14: Chemical Equilibrium 1. The equilibrium between carbon dioxide gas and carbonic acid is very important in biology and environmental science. CO 2 ( aq ) + H 2 O( l ) H 2 CO 3 (aq) Which one of the following is the correct equilibrium constant expression (K c ) for this reaction? A)      23 c 22 H CO K CO H O D) K c = 2 [CO ] [H CO ] B) K c = [CO ][H O] [H CO ] E) K c = 1 [H CO ] C) K c = 2 [H CO ] [CO ] Ans: C Category: Easy Section: 14.1 2. Which is the correct equilibrium constant expression for the following reaction? Fe 2 O 3 (s) + 3H 2 (g) 2Fe(s) + 3H 2 O(g) A) K c = [Fe 2 O 3 ] [H 2 ] 3 / [Fe] 2 [H 2 O] 3 D) K c = [Fe] 2 [H 2 O] 3 / [Fe 2 O 3 ] [H 2 ] 3 B) K c = [H 2 ] / [H 2 O] E) K c = [Fe] [H 2 O] / [Fe 2 O 3 ] [H 2 ] C) K c = [H 2 O] 3 / [H 2 ] 3 Ans: C Category: Easy Section: 14.1 3. The equilibrium constant expression for the reaction 2BrF 5 (g) Br 2 (g) + 5F 2 (g) is A) K c = [Br 2 ] [F 2 ] / [BrF 5 ] D) K c = [BrF 5 ] 2 / [Br 2 ][F 2 ] 5 B) K c = [Br 2 ] [F 2 ] 5 / [BrF 5 ] 2 E) K c = 2[BrF 5 ] 2 / ([Br 2 ] 5[F 2 ] 5 ) C) K c = [Br 2 ] [F 2 ] 2 / [BrF 5 ] 5 Ans: B Category: Easy Section: 14.1 4. The following reactions occur at 500 K. Arrange them in order of increasing tendency to proceed to completion (least greatest tendency). 1. 2NOCl 2NO + Cl 2 K p = 1.7 10 – 2 2. 2SO 3 2SO 2 + O 2 K p = 1.3 10 –5 3. 2NO 2 2NO + O 2 K p = 5.9 10 –5 A) 2 < 1 < 3 B) 1 < 2 < 3 C) 2 < 3 < 1 D) 3 < 2 < 1 E) 3 < 1 < 2 Ans: C Category: Medium Section: 14.1 5. Consider the two gaseous equilibria: SO 2 (g) + 1 / 2 O 2 (g) SO 3 (g) K 1 2SO 3 (g) SO 2 (g) + O 2 (g) K 2 The values of the equilibrium constants K 1 and K 2 are related by A) K 2 = K 1 2 B) K 2 2 = K 1 C) K 2 = 1/K 2 1 D) K 2 = 1/K 1 E) none of these. Ans: C Category: Medium Section: 14.2
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Chapter 14: Chemical Equilibrium Page 261 6. Carbon tetrachloride reacts at high temperatures with oxygen to produce two toxic gases, phosgene and chlorine. CCl 4 (g) + 1 / 2 O 2 (g) COCl 2 (g) + Cl 2 (g), K c = 4.4 10 9 at 1,000 K Calculate K c for the reaction 2CCl 4 (g) + O 2 (g) 2COCl 2 (g) + 2Cl 2 (g). A) 4.4 10 9 B) 8.8 10 9 C) 1.9 10 10 D) 1.9 10 19 E) 2.3 10 –10 Ans: D Category: Medium Section: 14.2 7. The equilibrium constant for the reaction Ni(s) + 4CO(g) Ni(CO) 4 (g) is 5.0 10 4 at 25ºC. What is the equilibrium constant for the reaction Ni(CO) 4 (g) Ni(s) + 4CO(g)? A) 2.0 10 –5 B) 2.5 10 9 C) 5.0 10 4 D) 5.0 10 –4 E) 2.0 10 –3 Ans: A Category: Medium Section: 14.2 8. Which of these statements is true about chemical equilibria in general ? A) At equilibrium the total concentration of products equals the total concentration of reactants, that is, [products] = [reactants]. B) Equilibrium is the result of the cessation of all chemical change. C) There is only one set of equilibrium concentrations that equals the K c value. D) At equilibrium, the rate constant of the forward reaction is equal to the rate constant for the reverse reaction. E) At equilibrium, the rate of the forward reaction is equal to as the rate of the reverse reaction. Ans: E Category: Medium Section: 14.3 9. The following reactions occur at 500 K. Arrange them in order of increasing tendency to proceed to completion (least completion greatest completion).
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Chapter 14 - Chapter 14: Chemical Equilibrium 1. The...

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