Chapter 14 Chemical Equilibrium

Chapter 14 Chemical Equilibrium

Complete Chapter Questions With Answers

Sample Questions Are Posted Below

5. A reaction with an equilibrium constant K_c = 1.5 x 10^-25 would consist of which of the following at equilibrium:
   A.approximately equal reactants and products
   B. some reactants and products with reactants slightly favored
   C. some reactants and products with products slightly favored
   D. essentially all reactants
   E. essentially all products

Bloom’s Level: 5. Evaluate
Difficulty: Easy
Gradable: automatic
Section: 14.01
Subtopic: Equilibrium Constant and Reaction Quotient
Topic: Chemical Equilibrium

6. A reaction with an equilibrium constant K_c = 1.5 x 10²¹ would consist of which of the following at equilibrium:
   A.approximately equal reactants and products
   B. some reactants and products with reactants slightly favored
   C. some reactants and products with products slightly favored
   D. essentially all reactants
   E. essentially all products

Bloom’s Level: 5. Evaluate
Difficulty: Easy
Gradable: automatic
Section: 14.01
Subtopic: Equilibrium Constant and Reaction Quotient
Topic: Chemical Equilibrium

7. The solubility of silver chloride can be increased by dissolving it in a solution containing ammonia.
   AgCl (s)    Ag⁺ (aq) + Cl^– (aq) K₁ = 1.6 x 10^-10
   Ag⁺ (aq) + 2NH₃ (aq)    Ag(NH₃)₂⁺ (aq) K₂ = 1.5 x 10⁷

   What is the value of the equilibrium constant for the overall reaction?
   AgCl (s) + 2NH₃ (aq)    Ag(NH₃)₂⁺ (aq) + Cl^– (aq) K_net = ?
   A.1.5 x 10⁷
   B. 2.4 x 10^-3
   C. 3.1 x 10^-3
   D. 2.3 x 10¹⁴
   E. 2.4 x 10⁷

Bloom’s Level: 4. Analyze
Difficulty: Medium
Gradable: automatic
Section: 14.02
Subtopic: Equilibrium Constant and Reaction Quotient
Subtopic: Solubility and Common Ion Effect
Topic: Chemical Equilibrium
Topic: Solubility

8. The solubility of silver bromide can be increased by dissolving it in a solution containing the thiosulfate anion.
   AgBr(s)    Ag⁺ (aq) + Br^– (aq) K₁ = 7.7 x 10^-13
   Ag⁺(aq) + 2S₂O₃^2- (aq)    Ag(S₂O₃)₂^3- (aq) K₂ = 4.7 x 10¹³

   What is the value of the equilibrium constant for the overall reaction?
   AgBr(s) + 2S₂O₃^2-(aq)    Ag(S₂O₃)₂^3-(aq) + Br^–(aq)
   A.3.6 x 10^-9
   B. 12.4 x 10¹³
   C. 4.7 x 10^-9
   D. 4.7 x 10¹³
   E. 36

Bloom’s Level: 4. Analyze
Difficulty: Medium
Gradable: automatic
Section: 14.02
Subtopic: Equilibrium Constant and Reaction Quotient
Subtopic: Solubility and Common Ion Effect
Topic: Chemical Equilibrium
Topic: Solubility

Consider the two gaseous equilibria:

The values of the equilibrium constants K₁ and K₂ are related by

1. K₂ = K₁²
   B. K₂² = K₁
   C.

K₂ = 1/K₁²

1. K₂ = 1/K₁
   E.none of these.

Bloom’s Level: 4. Analyze
Difficulty: Medium
Gradable: automatic
Section: 14.02
Subtopic: Equilibrium Constant and Reaction Quotient
Topic: Chemical Equilibrium

10. Carbon tetrachloride reacts at high temperatures with oxygen to produce two toxic gases, phosgene and chlorine.
    CCl₄(g) + ¹/₂O₂(g)    COCl₂(g) + Cl₂(g), K_c = 4.4 ´ 10⁹ at 1,000 K
    Calculate K_c for the reaction 2CCl₄(g) + O₂(g)    2COCl₂(g) + 2Cl₂(g).
    A.4.4 ´ 10⁹
    B. 8.8 ´ 10⁹
    C. 1.9 ´ 10¹⁰
    D. 1.9 ´ 10¹⁹
    E. 2.3 ´ 10^–10

Bloom’s Level: 4. Analyze
Difficulty: Medium
Gradable: automatic
Section: 14.02
Subtopic: Equilibrium Constant and Reaction Quotient
Topic: Chemical Equilibrium