Chem 134 Test #2 Ch:14 (Chemical
Kinetics)\(Chemical Equilibrium)
QUESTIONS AND VERIFIED CORRECT
ANSWERS GRADED A+ LATEST 100%
GUARANTEED PASS
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 - CORRECT ANSWER-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. - CORRECT ANSWER-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 - CORRECT ANSWER-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 - CORRECT ANSWER-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
C) [NO2]2 / [N2O4]
D) [NO2] / [N2O4]
, E) [NO2]2[N2O4] - CORRECT ANSWER-C
6) A reaction vessel is charged with hydrogen iodide, which partially decomposes to molecular
hydrogen and
iodine:
2HI (g) => H2(g) + I2(g)
When the system comes to equilibrium at 425eC, PHI = 0.708 atm, and PH2 = PI2
= 0.0960 atm. The value of Keq at this temperature is ________.
A) 54.3
B) 6.80 ˛ 10-2
C) Keq cannot be calculated for this gas reaction when the volume of the reaction vessel is not
given.
D) 1.30 ˛ 10-2
E) 1.84 ˛ 10-2 - CORRECT ANSWER-E
7) At elevated temperatures, molecular hydrogen and molecular bromine react to partially form
hydrogen
bromide:
H2 (g) + Br2 (g) => 2HBr (g)
A mixture of 0.682 mol of H2 and 0.440 mol of Br2 is combined in a reaction vessel with a
volume of 2.00 L.
At equilibrium at 700 K, there are 0.566 mol of H2 present. At equilibrium, there are
__________ mol of Br2
present in the reaction vessel.
A) 0.566
Kinetics)\(Chemical Equilibrium)
QUESTIONS AND VERIFIED CORRECT
ANSWERS GRADED A+ LATEST 100%
GUARANTEED PASS
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 - CORRECT ANSWER-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. - CORRECT ANSWER-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 - CORRECT ANSWER-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 - CORRECT ANSWER-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
C) [NO2]2 / [N2O4]
D) [NO2] / [N2O4]
, E) [NO2]2[N2O4] - CORRECT ANSWER-C
6) A reaction vessel is charged with hydrogen iodide, which partially decomposes to molecular
hydrogen and
iodine:
2HI (g) => H2(g) + I2(g)
When the system comes to equilibrium at 425eC, PHI = 0.708 atm, and PH2 = PI2
= 0.0960 atm. The value of Keq at this temperature is ________.
A) 54.3
B) 6.80 ˛ 10-2
C) Keq cannot be calculated for this gas reaction when the volume of the reaction vessel is not
given.
D) 1.30 ˛ 10-2
E) 1.84 ˛ 10-2 - CORRECT ANSWER-E
7) At elevated temperatures, molecular hydrogen and molecular bromine react to partially form
hydrogen
bromide:
H2 (g) + Br2 (g) => 2HBr (g)
A mixture of 0.682 mol of H2 and 0.440 mol of Br2 is combined in a reaction vessel with a
volume of 2.00 L.
At equilibrium at 700 K, there are 0.566 mol of H2 present. At equilibrium, there are
__________ mol of Br2
present in the reaction vessel.
A) 0.566
