Question 1

Consider the following mechanism for the oxidation of bromide ions by hydrogen peroxide in aqueous acid solution. H+  + H2O2 +  + H2O2   H2O+-OH (rapid equilibrium)  H2O+-OH + Br-  HOBr + H2O (slow)  HOBr + H+ + Br-  Br2 + H2O (fast)  What is the overall reaction equation for this process? A)  2H2O+-OH + 2Br-   H2O2 + Br2 + 2H2O B)  2H+ + 2Br- + H2O2  Br2 + 2H2O C)  2H+ + H2O2 + Br- + HOBr  H2O+-OH + Br2 + H2O D)  H2O+-OH + Br- + H+  Br2 + H2O E)  none of the above" class="answers-bank-image d-inline" rel="preload" > H2O+-OH (rapid equilibrium) 
H2O+-OH + Br-  HOBr + H2O (slow) 
HOBr + H+ + Br-  Br2 + H2O (fast) 
What is the overall reaction equation for this process?

Accepted Answer

A)   2H2O+-OH + 2Br-   H2O2 + Br2 + 2H2O
B)   2H+ + 2Br- + H2O2  Br2 + 2H2O
C)   2H+ + H2O2 + Br- + HOBr  H2O+-OH + Br2 + H2O
D)   H2O+-OH + Br- + H+  Br2 + H2O
E)   none of the aboveF) A) and B)
G) None of the above

Question 2

A reaction is first-order with respect to the reactant R. Which of the following plots will produce a straight line?

Accepted Answer

A)   [R] vs. 1/time
B)   1/[R] vs. time
C)   [R]2 vs. time
D)   1/[R]2 vs. time
E)   ln[R] vs. timeF) A) and C)
G) A) and E)

Question 3

The units of the rate constant depend on the order of the reaction.

Accepted Answer

A) True 
 B)False

Question 4

Which one of the following sets of units is appropriate for a third-order rate constant?

Accepted Answer

A)   s-1
B)   mol L-1 s-1
C)   L mol-1 s-1
D)   L2 mol-2 s-1
E)   L3 mol-3 s-1F) A) and B)
G) None of the above

Question 5

The rate law cannot be predicted from the stoichiometry of a reaction.

Accepted Answer

A) True 
 B)False

Question 6

A chemical reaction of the general type
A F1F1F1S1F1F1F10 2B
is first-order, with a rate constant of 1.52 × 10-4 s-1.
a. Calculate the half-life of A.
b. Assuming the initial concentration of A is 0.067 mol L-1, calculate the time needed for the concentration to fall to 0.010 mol L-1.

Accepted Answer

Question 7

Consider the following reaction 8A(g)  + 5B(g)   8C(g)  + 6D(g) 
If [C] is increasing at the rate of 4.0 mol L-1s-1, at what rate is [B] changing?

Accepted Answer

A)   -0.40 mol L-1s-1
B)   -2.5 mol L-1s-1
C)   -4.0 mol L-1s-1
D)   -6.4 mol L-1s-1
E)   none of the above, since its rate of change must be positiveF) B) and E)
G) C) and D)

Question 8

In the lock and key model of enzyme action, the active site on the enzyme provides an exact fit for the substrate.

Accepted Answer

A) True 
 B)False

Exam 16: Kinetics: Rates and Mechanisms of Chemical Reactions

The units of the rate constant depend on the order of the reaction.

Correct Answer
verified

The rate law cannot be predicted from the stoichiometry of a reaction.

Correct Answer
verified

Consider the following reaction 8A(g) + 5B(g)  8C(g) + 6D(g) If [C] is increasing at the rate of 4.0 mol L^-1s^-1, at what rate is [B] changing?

Correct Answer
verified

Which one of the following sets of units is appropriate for a third-order rate constant?

Correct Answer
verified

A reaction is first-order with respect to the reactant R. Which of the following plots will produce a straight line?

Correct Answer
verified

In the lock and key model of enzyme action, the active site on the enzyme provides an exact fit for the substrate.

Correct Answer
verified

Correct Answer
verified

A chemical reaction of the general type A  2B is first-order, with a rate constant of 1.52 × 10^-4 s^-1. a. Calculate the half-life of A. b. Assuming the initial concentration of A is 0.067 mol L^-1, calculate the time needed for the concentration to fall to 0.010 mol L^-1.

Correct Answer
verified

Exam 16: Kinetics: Rates and Mechanisms of Chemical Reactions

The units of the rate constant depend on the order of the reaction.

Correct AnswerverifiedShow Answer

The rate law cannot be predicted from the stoichiometry of a reaction.

Correct AnswerverifiedShow Answer

Consider the following reaction 8A(g) + 5B(g)  8C(g) + 6D(g) If [C] is increasing at the rate of 4.0 mol L-1s-1, at what rate is [B] changing?

Correct AnswerverifiedShow Answer

Which one of the following sets of units is appropriate for a third-order rate constant?

Correct AnswerverifiedShow Answer

A reaction is first-order with respect to the reactant R. Which of the following plots will produce a straight line?

Correct AnswerverifiedShow Answer

In the lock and key model of enzyme action, the active site on the enzyme provides an exact fit for the substrate.

Correct AnswerverifiedShow Answer

Consider the following mechanism for the oxidation of bromide ions by hydrogen peroxide in aqueous acid solution. H+ + H2O2 H2O+-OH (rapid equilibrium) H2O+-OH + Br-  HOBr + H2O (slow) HOBr + H+ + Br-  Br2 + H2O (fast) What is the overall reaction equation for this process?

Correct AnswerverifiedShow Answer

A chemical reaction of the general type A  2B is first-order, with a rate constant of 1.52 × 10-4 s-1. a. Calculate the half-life of A. b. Assuming the initial concentration of A is 0.067 mol L-1, calculate the time needed for the concentration to fall to 0.010 mol L-1.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Consider the following reaction 8A(g) + 5B(g)  8C(g) + 6D(g) If [C] is increasing at the rate of 4.0 mol L^-1s^-1, at what rate is [B] changing?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A chemical reaction of the general type A  2B is first-order, with a rate constant of 1.52 × 10^-4 s^-1. a. Calculate the half-life of A. b. Assuming the initial concentration of A is 0.067 mol L^-1, calculate the time needed for the concentration to fall to 0.010 mol L^-1.

Correct Answer
verified