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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)  2 3 c 2 2 H CO K CO H O D) K c = 2 2 3 [CO ] [H CO ] B) K c = 2 2 2 3 [CO ][H O] [H CO ] E) K c = 2 3 1 [H CO ] C) K c = 2 3 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 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 ?
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