CHEM 134 CH: 15 (CHEMICAL EQUILIBRIUM) QUESTIONS
WITH COMPLETE SOLUTIONS
1) At equilibrium, __________.
A) the rates of the forward and reverse reactions are equal
B) the rate constants of the forward and reverse reactions are equal
C) all chemical reactions have ceased
D) the value of the equilibrium constant is 1
E) the limiting reagent has been consumed Ans✓✓✓ A
2) Which one of the following is true concerning the Haber process?
A) It is a process used for shifting equilibrium positions to the right for
more economical chemical
synthesis of a variety of substances.
B) It is a process for the synthesis of elemental chlorine.
C) It is a process used for the synthesis of ammonia.
D) It is an industrial synthesis of sodium chloride that was discovered by
Karl Haber.
E) It is another way of stating LeChatelier's principle. Ans✓✓✓ C
3) The equilibrium-constant expression depends on the __________ of
the reaction.
A) stoichiometry and mechanism
B) the quantities of reactants and products initially present
C) temperature
, D) mechanism
E) stoichiometry Ans✓✓✓ E
4) The equilibrium constant for the gas phase reaction
N2 (g) + 3H2 (g) => 2NH3 (g)
is Keq = 4.34 ˛ 10-3 at 300eC. At equilibrium, __________.
A) reactants predominate
B) only reactants are present
C) only products are present
D) products predominate
E) roughly equal amounts of products and reactants are present
Ans✓✓✓ A
5) Which of the following expressions is the correct equilibrium-
constant expression for the equilibrium
between dinitrogen tetroxide and nitrogen dioxide?
N2O4 (g) => 2NO2 (g)
A) [NO2][N2O4]
B) [NO2] / [N2O4]2
WITH COMPLETE SOLUTIONS
1) At equilibrium, __________.
A) the rates of the forward and reverse reactions are equal
B) the rate constants of the forward and reverse reactions are equal
C) all chemical reactions have ceased
D) the value of the equilibrium constant is 1
E) the limiting reagent has been consumed Ans✓✓✓ A
2) Which one of the following is true concerning the Haber process?
A) It is a process used for shifting equilibrium positions to the right for
more economical chemical
synthesis of a variety of substances.
B) It is a process for the synthesis of elemental chlorine.
C) It is a process used for the synthesis of ammonia.
D) It is an industrial synthesis of sodium chloride that was discovered by
Karl Haber.
E) It is another way of stating LeChatelier's principle. Ans✓✓✓ C
3) The equilibrium-constant expression depends on the __________ of
the reaction.
A) stoichiometry and mechanism
B) the quantities of reactants and products initially present
C) temperature
, D) mechanism
E) stoichiometry Ans✓✓✓ E
4) The equilibrium constant for the gas phase reaction
N2 (g) + 3H2 (g) => 2NH3 (g)
is Keq = 4.34 ˛ 10-3 at 300eC. At equilibrium, __________.
A) reactants predominate
B) only reactants are present
C) only products are present
D) products predominate
E) roughly equal amounts of products and reactants are present
Ans✓✓✓ A
5) Which of the following expressions is the correct equilibrium-
constant expression for the equilibrium
between dinitrogen tetroxide and nitrogen dioxide?
N2O4 (g) => 2NO2 (g)
A) [NO2][N2O4]
B) [NO2] / [N2O4]2
