Question 1

What is the average rate of disappearance (M/s)of I- between 800.0 s and 1200.0 s?

Accepted Answer

A) 2.8 × 10-5 
B) 3.3 × 10-5 
C) 5.8 × 104 
D) 2.3 × 10-5 
E) 2.6 × 10-4 
A) 2.8 × 10-5 
B) 3.3 × 10-5 
C) 5.8 × 104 
D) 2.3 × 10-5 
E) 2.6 × 10-4

Question 2

One difference between first- and second-order reactions is that ________.

Accepted Answer

A) the half-life of a first-order reaction does not depend on [A]0; the half-life of a second-order reaction does depend on [A]0 
B) the rate of both first-order and second-order reactions do not depend on reactant concentrations 
C) the rate of a first-order reaction depends on reactant concentrations; the rate of a second-order reaction does not depend on reactant concentrations 
D) a first-order reaction can be catalyzed; a second-order reaction cannot be catalyzed 
E) None of the above are true. 
A) the half-life of a first-order reaction does not depend on [A]0; the half-life of a second-order reaction does depend on [A]0 
B) the rate of both first-order and second-order reactions do not depend on reactant concentrations 
C) the rate of a first-order reaction depends on reactant concentrations; the rate of a second-order reaction does not depend on reactant concentrations 
D) a first-order reaction can be catalyzed; a second-order reaction cannot be catalyzed 
E) None of the above are true.

Question 3

How many moles of B are present at 40.s?

Accepted Answer

A) 0.18 
B) 0.070 
C) 0.124 
D) 0.054 
E) 7.8 × 10-3 
A) 0.18 
B) 0.070 
C) 0.124 
D) 0.054 
E) 7.8 × 10-3

Question 4

A unimolecular elementary reaction involves ________ reactant molecule(s).

Accepted Answer

The answer of A unimolecular elementary reaction involves ________ reactant...

Question 5

If the rate law for the reaction 2A + 3B → products
Is first order in A and second order in B,then the rate law is

Accepted Answer

A) k[A][B] 
B) k[A]2[B]3 
C) k[A][B]2 
D) k[A]2[B] 
E) k[A]2[B]2 
A) k[A][B] 
B) k[A]2[B]3 
C) k[A][B]2 
D) k[A]2[B] 
E) k[A]2[B]2

Question 6

The decomposition of [A] in solution at 80 °C proceeds via the following reaction: A (aq)→ B (aq)
The dependence of the rate constant on temperature is studied and the graph below is prepared from the results.   What is the energy of activation (kJ/mol)for this reaction?

Accepted Answer

A) 1.6 × 105 
B) 4.4 × 10-7 
C) 160 
D) 4.4 × 10-4 
E) 1.9 × 104 
A) 1.6 × 105 
B) 4.4 × 10-7 
C) 160 
D) 4.4 × 10-4 
E) 1.9 × 104

Question 7

Consider the following reaction: 3A → 2B
The average rate of appearance of B is given by Δ[B]/Δt.Comparing the rate of appearance of B and the rate of disappearance of A,we get

Accepted Answer

A) -2/3 
B) +2/3 
C) -3/2 
D) +1 
E) +3/2 
A) -2/3 
B) +2/3 
C) -3/2 
D) +1 
E) +3/2

Question 8

The rate of a chemical reaction should ________ as the temperature rises.

Accepted Answer

The answer of The rate of a chemical reaction should...

Question 9

Consider the following reaction: A → B
The average rate of appearance of B is given by Δ[B]Δt.Comparing the rate of appearance of B and the rate of disappearance of A,we get Δ[B]/Δt =

Accepted Answer

A) +1 
B) +2 
C) -1 
D) +1/2 
E) -1/2 
A) +1 
B) +2 
C) -1 
D) +1/2 
E) -1/2

Question 10

The rate law of the overall reaction A + B → C
Is rate = k[A]2.Which of the following will not increase the rate of the reaction?

Accepted Answer

A) increasing the concentration of reactant A 
B) increasing the concentration of reactant B 
C) increasing the temperature of the reaction 
D) adding a catalyst for the reaction 
E) All of these will increase the rate. 
A) increasing the concentration of reactant A 
B) increasing the concentration of reactant B 
C) increasing the temperature of the reaction 
D) adding a catalyst for the reaction 
E) All of these will increase the rate.

Question 11

The following reaction is second order in [A] and the rate constant is 0.025     : A → B
The concentration of A was 0.65 M at 33 s.The initial concentration of A was ________ M.

Accepted Answer

A) 2.4 
B) 0.27 
C) 0.24 
D) 1.4 
E) 1.2 × 10-2 
A) 2.4 
B) 0.27 
C) 0.24 
D) 1.4 
E) 1.2 × 10-2

Question 12

A reaction was found to be third order in A.Increasing the concentration of A by a factor of 3 will cause the reaction rate to ________.

Accepted Answer

A) remain constant 
B) increase by a factor of 27 
C) increase by a factor of 9 
D) triple 
E) decrease by a factor of the cube root of 3 
A) remain constant 
B) increase by a factor of 27 
C) increase by a factor of 9 
D) triple 
E) decrease by a factor of the cube root of 3

Question 13

Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO2 (g)→ 2NO (g)+ O2 (g)
In a particular experiment at 300 °C,[NO2] drops from 0.0100 to 0.00800 M in   The rate of appearance of O2 for this period is ________ M/s.

Accepted Answer

A) 1.0 ×   
B) 2.0 ×   
C) 4.0 ×   
D) 2.0 ×   
E) 4.0 ×   
A) 1.0 ×   
B) 2.0 ×   
C) 4.0 ×   
D) 2.0 ×   
E) 4.0 ×

Question 14

What is the half-life of an unknown compound if 17.0% of the compound decomposes in 150 minutes via a first-order process?

Accepted Answer

A) 59 minutes 
B) 40 minutes 
C) 1116 minutes 
D) 279 minutes 
E) 558 minutes 
A) 59 minutes 
B) 40 minutes 
C) 1116 minutes 
D) 279 minutes 
E) 558 minutes

Question 15

The following reaction occurs in aqueous solution: NH4+ (aq)+ NO2- (aq)→ N2 (g)+ 2H2O (l)
The data below is obtained at 25 °C.   The order of the reaction in NH4+ is ________.

Accepted Answer

A) -2 
B) -1 
C) +2 
D) +1 
E) 0 
A) -2 
B) -1 
C) +2 
D) +1 
E) 0

Question 16

At elevated temperatures,methylisonitrile (CH3NC)isomerizes to acetonitrile (CH3CN): CH3NC (g)→ CH3CN (g)
At the start of the experiment,there are 0.200 mol of reactant (CH3NC)and 0 mol of product (CH3CN)in the reaction vessel.After 25 min of reaction,0.108 mol of reactant (CH3NC)remain. The average rate of decomposition of methyl isonitrile,CH3NC,in this 25 min period is ________ mol/min.

Accepted Answer

A) 3.7 × 10-3 
B) 0.092 
C) 2.3 
D) 4.3 × 10-3 
E) 0.54 
A) 3.7 × 10-3 
B) 0.092 
C) 2.3 
D) 4.3 × 10-3 
E) 0.54

Question 17

It was determined experimentally that the reaction rate remained the same when the concentration of A was doubled in the following reaction: A + B → C
The reaction is ________ order in A.

Accepted Answer

A) zero 
B) first 
C) second 
D) third 
E) one-half 
A) zero 
B) first 
C) second 
D) third 
E) one-half

Question 18

Write the rate law for the reaction:
aA → bB + cC.

Accepted Answer

The answer of Write the rate law for the reaction:
aA...

Question 19

A catalyst can ________ the rate of a reaction by providing an alternative pathway with a ________ activation energy

Accepted Answer

A) decrease, higher 
B) increase, lower 
C) decrease, lower 
D) increase, higher 
E) decrease, constant 
A) decrease, higher 
B) increase, lower 
C) decrease, lower 
D) increase, higher 
E) decrease, constant

Question 20

How many moles of B are present at 30 s?

Accepted Answer

A) 2.4 × 10-3 
B) 0.15 
C) 0.073 
D) 1.7 × 10-3 
E) 0.051 
A) 2.4 × 10-3 
B) 0.15 
C) 0.073 
D) 1.7 × 10-3 
E) 0.051

Exam 14: Chemical Kinetics

What is the average rate of disappearance (M/s)of I- between 800.0 s and 1200.0 s?

One difference between first- and second-order reactions is that ________.

How many moles of B are present at 40.s?

A unimolecular elementary reaction involves ________ reactant molecule(s).

If the rate law for the reaction 2A + 3B → products Is first order in A and second order in B,then the rate law is

The decomposition of [A] in solution at 80 °C proceeds via the following reaction: A (aq)→ B (aq) The dependence of the rate constant on temperature is studied and the graph below is prepared from the results. What is the energy of activation (kJ/mol)for this reaction?

Consider the following reaction: 3A → 2B The average rate of appearance of B is given by Δ[B]/Δt.Comparing the rate of appearance of B and the rate of disappearance of A,we get

The rate of a chemical reaction should ________ as the temperature rises.

Consider the following reaction: A → B The average rate of appearance of B is given by Δ[B]Δt.Comparing the rate of appearance of B and the rate of disappearance of A,we get Δ[B]/Δt =

The rate law of the overall reaction A + B → C Is rate = k[A]2.Which of the following will not increase the rate of the reaction?

The following reaction is second order in [A] and the rate constant is 0.025 : A → B The concentration of A was 0.65 M at 33 s.The initial concentration of A was ________ M.

A reaction was found to be third order in A.Increasing the concentration of A by a factor of 3 will cause the reaction rate to ________.

Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO2 (g)→ 2NO (g)+ O2 (g) In a particular experiment at 300 °C,[NO2] drops from 0.0100 to 0.00800 M in The rate of appearance of O2 for this period is ________ M/s.

What is the half-life of an unknown compound if 17.0% of the compound decomposes in 150 minutes via a first-order process?

The following reaction occurs in aqueous solution: NH4+ (aq)+ NO2- (aq)→ N2 (g)+ 2H2O (l) The data below is obtained at 25 °C. The order of the reaction in NH4+ is ________.

It was determined experimentally that the reaction rate remained the same when the concentration of A was doubled in the following reaction: A + B → C The reaction is ________ order in A.

Write the rate law for the reaction: aA → bB + cC.

A catalyst can ________ the rate of a reaction by providing an alternative pathway with a ________ activation energy

How many moles of B are present at 30 s?

Introduction: Matter, energy, and Measurement

Atoms, molecules, and Ions

Chemical Reactions and Reaction Stoichiometry

Reactions in Aqueous Solution

Thermochemistry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Molecular Geometry and Bonding Theories

Gases

Liquids and Intermolecular Forces

Solids and Modern Materials

Properties of Solutions

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Aqueous Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Transition Metals and Coordination Chemistry

The Chemistry of Life: Organic and Biological Chemistry

Filters

What is the average rate of disappearance (M/s)of I^- between 800.0 s and 1200.0 s?

The decomposition of [A] in solution at 80 °C proceeds via the following reaction: A(aq)→ B(aq) The dependence of the rate constant on temperature is studied and the graph below is prepared from the results. What is the energy of activation (kJ/mol)for this reaction?

The rate law of the overall reaction A + B → C Is rate = k[A]².Which of the following will not increase the rate of the reaction?

Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO₂ (g)→ 2NO (g)+ O₂ (g) In a particular experiment at 300 °C,[NO₂] drops from 0.0100 to 0.00800 M in The rate of appearance of O₂ for this period is ________ M/s.

The following reaction occurs in aqueous solution: NH₄⁺(aq)+ NO₂^- (aq)→ N₂(g)+ 2H₂O (l) The data below is obtained at 25 °C. The order of the reaction in NH₄⁺ is ________.

A catalyst can the rate of a reaction by providing an alternative pathway with a activation energy