Question 1

What is the name given to the equation that relates the rate of reaction to the concentrations of reactants?

Accepted Answer

The answer of What is the name given to the...

Question 2

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

Accepted Answer

A) True 
 B)False

Question 3

The rate of a reaction is determined by the rate of the fastest step in the mechanism.

Accepted Answer

A) True 
 B)False

Question 4

Enzymes are _______ .

Accepted Answer

A) large carbohydrate molecules 
B) also called substrates 
C) usually heterogeneous catalysts 
D) insensitive to temperature 
E) biological catalysts 
A) large carbohydrate molecules 
B) also called substrates 
C) usually heterogeneous catalysts 
D) insensitive to temperature 
E) biological catalysts

Question 5

For a zeroth-order reaction,if the concentration of reactant A is plotted vs.time,which corresponds to the slope of this plot?

Accepted Answer

A) 1/[A] 
B) k 
C) 1/k 
D) ln[A] 
E) -k 
A) 1/[A] 
B) k 
C) 1/k 
D) ln[A] 
E) -k

Question 6

A transition state is a species (or state)corresponding to an energy maximum on a reaction energy diagram.

Accepted Answer

A) True 
 B)False

Question 7

For the reaction A + 2B → C,which expression is correct?

Accepted Answer

A) Δ[C]/Δt = Δ[A]/Δt 
B) Δ[C]/Δt = 2Δ[B]/Δt 
C) Δ[C]/Δt = -2Δ[B]/Δt 
D) Δ[C]/Δt = -½Δ[B]/Δt 
E) Δ[C]/Δt = -½Δ[A]/Δt 
A) Δ[C]/Δt = Δ[A]/Δt 
B) Δ[C]/Δt = 2Δ[B]/Δt 
C) Δ[C]/Δt = -2Δ[B]/Δt 
D) Δ[C]/Δt = -½Δ[B]/Δt 
E) Δ[C]/Δt = -½Δ[A]/Δt

Question 8

What rate constant can be determined from only the half-life of a reaction?

Accepted Answer

A) Zeroth 
B) First 
C) Second 
D) Third 
E) The rate constant cannot be determined using only a rate constant for any reaction. 
A) Zeroth 
B) First 
C) Second 
D) Third 
E) The rate constant cannot be determined using only a rate constant for any reaction.

Question 9

According to the collision theory of reaction rates,what are the three requirements which must be met before an elementary reaction between two molecules can occur?

Accepted Answer

Molecules must collide with ea

Question 10

Butadiene,C4H6 (used to make synthetic rubber and latex paints).dimerizes to C8H12 with a rate law of rate = 0.014 L/mol• s [C4H6]2.What will be the concentration of C4H6 after 3.0 hours if the initial concentration is 0.025 M?

Accepted Answer

A) 0.0052 M 
B) 0.024 M 
C) 43 M 
D) 190 M 
E) 0.0000 M 
A) 0.0052 M 
B) 0.024 M 
C) 43 M 
D) 190 M 
E) 0.0000 M

Question 11

The rate law predicted by the following two-step mechanism is Rate = k[A][B].
A → C + B (slow)
A + B → C + E (fast)

Accepted Answer

A) True 
 B)False

Question 12

A certain first-order reaction A → B is 25% complete in 42 min at 25°C.What is the half-life of the reaction?

Accepted Answer

A) 21 min 
B) 42 min 
C) 84 min 
D) 120 min 
E) 101 min 
A) 21 min 
B) 42 min 
C) 84 min 
D) 120 min 
E) 101 min

Question 13

What are possible units for the reaction rate?

Accepted Answer

A) L • mol-1 • s-1 
B) L2 • mol-2 • s-1 
C) s-1 
D) s-2 
E) mol • L-1 • s-1 
A) L • mol-1 • s-1 
B) L2 • mol-2 • s-1 
C) s-1 
D) s-2 
E) mol • L-1 • s-1

Question 14

Consider the following potential energy profile for the A → B reaction.The overall reaction is________.

Accepted Answer

A) endothermic 
B) exothermic 
A) endothermic 
B) exothermic

Question 15

Consider the following potential energy profile for the A → B reaction.How many intermediates are formed?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 16

The reaction 2NO2(g)→ 2NO(g)+ O2(g)is suspected to be second order in NO2.Which of the following kinetic plots would be the most useful to confirm whether or not the reaction is second order?

Accepted Answer

A) A plot of [NO2]-1 vs.t 
B) A plot of ln [NO2] vs.t 
C) A plot of [NO2] vs.t 
D) A plot of ln [NO2]-1 vs.t 
E) A plot of [NO2]2 vs.t 
A) A plot of [NO2]-1 vs.t 
B) A plot of ln [NO2] vs.t 
C) A plot of [NO2] vs.t 
D) A plot of ln [NO2]-1 vs.t 
E) A plot of [NO2]2 vs.t

Question 17

The rate law for the reaction 3A → 2B is rate = k[A] with a rate constant of 0.0447 h-1.What is the half-life of the reaction?

Accepted Answer

A) 0.0224 h 
B) 0.0645 h 
C) 15.5 h 
D) 22.4 h 
E) 44.7 h 
A) 0.0224 h 
B) 0.0645 h 
C) 15.5 h 
D) 22.4 h 
E) 44.7 h

Question 18

Is a bimolecular reaction necessarily second-order? Is a second order reaction necessarily bimolecular? Answer,with explanations and clarifications.

Accepted Answer

For elementary reactions,the order follo

Question 19

Carbon-14 is a radioactive isotope which decays with a half-life of 5730 years.What is the first-order rate constant for its decay?

Accepted Answer

A) 5.25 × 10-5 yr-1 
B) 1.21 × 10-4 yr-1 
C) 1.75 × 10-4 yr-1 
D) 3.49 × 10-4 yr-1 
E) 3.97 × 103 yr-1 
A) 5.25 × 10-5 yr-1 
B) 1.21 × 10-4 yr-1 
C) 1.75 × 10-4 yr-1 
D) 3.49 × 10-4 yr-1 
E) 3.97 × 103 yr-1

Question 20

According to the ___________ ________ of chemical kinetics,the reaction rate is directly proportional to the number of molecular collisions per second.

Accepted Answer

The answer of According to the ___________ ________ of chemical...

Exam 14: Chemical Kinetics

What is the name given to the equation that relates the rate of reaction to the concentrations of reactants?

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

The rate of a reaction is determined by the rate of the fastest step in the mechanism.

Enzymes are _______ .

For a zeroth-order reaction,if the concentration of reactant A is plotted vs.time,which corresponds to the slope of this plot?

A transition state is a species (or state)corresponding to an energy maximum on a reaction energy diagram.

For the reaction A + 2B → C,which expression is correct?

What rate constant can be determined from only the half-life of a reaction?

According to the collision theory of reaction rates,what are the three requirements which must be met before an elementary reaction between two molecules can occur?

Butadiene,C4H6 (used to make synthetic rubber and latex paints).dimerizes to C8H12 with a rate law of rate = 0.014 L/mol• s [C4H6]2.What will be the concentration of C4H6 after 3.0 hours if the initial concentration is 0.025 M?

The rate law predicted by the following two-step mechanism is Rate = k[A][B]. A → C + B (slow) A + B → C + E (fast)

A certain first-order reaction A → B is 25% complete in 42 min at 25°C.What is the half-life of the reaction?

What are possible units for the reaction rate?

Consider the following potential energy profile for the A → B reaction.The overall reaction is________.

Consider the following potential energy profile for the A → B reaction.How many intermediates are formed?

The reaction 2NO2(g)→ 2NO(g)+ O2(g)is suspected to be second order in NO2.Which of the following kinetic plots would be the most useful to confirm whether or not the reaction is second order?

The rate law for the reaction 3A → 2B is rate = k[A] with a rate constant of 0.0447 h-1.What is the half-life of the reaction?

Is a bimolecular reaction necessarily second-order? Is a second order reaction necessarily bimolecular? Answer,with explanations and clarifications.

Carbon-14 is a radioactive isotope which decays with a half-life of 5730 years.What is the first-order rate constant for its decay?

According to the ___________ ________ of chemical kinetics,the reaction rate is directly proportional to the number of molecular collisions per second.

Chemistry: the Central Science

Atoms Molecules and Ions

Stoichiometry Ratios of Combination

Reactions in Aqueous Solutions

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Electron Configuration and the Periodic Table

Chemical Bonding I Basic Concepts

Chemical Bonding Ii Molecular Geometry and Bonding Theories

Gases

Intermolecular Forces and the Physical Properties of Liquids and Solids

Modern Materials

Physical Properties of Solutions

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy Free Energy and Equilibrium

Electrochemistry

Nuclear Chemistry

Environmental Chemistry

Coordination Chemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Organic Chemistry

Filters

Butadiene,C₄H₆ (used to make synthetic rubber and latex paints).dimerizes to C₈H₁₂ with a rate law of rate = 0.014 L/mol• s [C₄H₆]².What will be the concentration of C₄H₆ after 3.0 hours if the initial concentration is 0.025 M?

The reaction 2NO₂(g)→ 2NO(g)+ O₂(g)is suspected to be second order in NO₂.Which of the following kinetic plots would be the most useful to confirm whether or not the reaction is second order?

The rate law for the reaction 3A → 2B is rate = k[A] with a rate constant of 0.0447 h^-1.What is the half-life of the reaction?

According to the ___ of chemical kinetics,the reaction rate is directly proportional to the number of molecular collisions per second.