Question

19. The rate law for a reaction is rate = k[A]²[B]. Which of the following mixtures of reactants will give the smallest initial rate? a. 1.0 M A, 1.0 M B b. 2.0 M A, 0.50 M B c. 0.50 M A, 0.50 M B d. 0.125 M A, 3.0 M B e. 1.5 M A, 0.50 M B 20. For the reaction 2A + B ? C, the rate law is ?[C]/?t = k[A]²[B] Which of the factor(s) will affect the value of the rate constant for this reaction? I. decreasing the temperature II. adding a catalyst III. decreasing the concentration of reactant A a. I only b. II only c. III only d. I and II e. I, II, and III 21. A student analyzed a first-order reaction and obtained the graph below. Unfortunately, the student forgot to label the axes. What are the correct labels for the x and y axes? a. x axis = time, y axis = ln[A] b. x axis = ln[time], y axis = [A] c. x axis = ln[time], y axis = [A] d. x axis = time, y axis = 1/[A] e. x axis = 1/time, y axis = 1/[A] In a first-order reaction, the half-life is 144 minutes. What is the rate constant?

          19. The rate law for a reaction is rate = k[A]²[B]. Which of the following mixtures of reactants will give the smallest initial rate?
a. 1.0 M A, 1.0 M B
b. 2.0 M A, 0.50 M B
c. 0.50 M A, 0.50 M B
d. 0.125 M A, 3.0 M B
e. 1.5 M A, 0.50 M B
20. For the reaction 2A + B ? C, the rate law is
?[C]/?t = k[A]²[B]
Which of the factor(s) will affect the value of the rate constant for this reaction?
I. decreasing the temperature
II. adding a catalyst
III. decreasing the concentration of reactant A
a. I only b. II only c. III only d. I and II e. I, II, and III
21. A student analyzed a first-order reaction and obtained the graph below. Unfortunately, the student forgot to label the axes. What are the correct labels for the x and y axes?
a. x axis = time, y axis = ln[A]
b. x axis = ln[time], y axis = [A]
c. x axis = ln[time], y axis = [A]
d. x axis = time, y axis = 1/[A]
e. x axis = 1/time, y axis = 1/[A]
In a first-order reaction, the half-life is 144 minutes. What is the rate constant?

19. The rate law for a reaction is rate = k[A]²[B]. Which of the following mixtures of reactants will give the smallest initial rate?
a. 1.0 M A, 1.0 M B
b. 2.0 M A, 0.50 M B
c. 0.50 M A, 0.50 M B
d. 0.125 M A, 3.0 M B
e. 1.5 M A, 0.50 M B
20. For the reaction 2A + B ? C, the rate law is
?[C]/?t = k[A]²[B]
Which of the factor(s) will affect the value of the rate constant for this reaction?
I. decreasing the temperature
II. adding a catalyst
III. decreasing the concentration of reactant A
a. I only b. II only c. III only d. I and II e. I, II, and III
21. A student analyzed a first-order reaction and obtained the graph below. Unfortunately, the student forgot to label the axes. What are the correct labels for the x and y axes?
a. x axis = time, y axis = ln[A]
b. x axis = ln[time], y axis = [A]
c. x axis = ln[time], y axis = [A]
d. x axis = time, y axis = 1/[A]
e. x axis = 1/time, y axis = 1/[A]
In a first-order reaction, the half-life is 144 minutes. What is the rate constant?

Added by Annette S.

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