Question 1

What is the overall order of the reaction?

Accepted Answer

A) 4 
B) 0 
C) 1 
D) 2 
E) 3 
A) 4 
B) 0 
C) 1 
D) 2 
E) 3

Question 2

The kinetics of the reaction below were studied and it was determined that the reaction rate increased by a factor of 9 when the concentration of B was tripled. The reaction is __________ order in B. A + B → P

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 3

In the Arrhenius equation, k = Ae-Ea/RT
__________ is the frequency factor.

Accepted Answer

A) k 
B) A 
C) e 
D) Ea 
E) R 
A) k 
B) A 
C) e 
D) Ea 
E) R

Question 4

At elevated temperatures, methylisonitrile (CH3NC)isomerizes to acetonitrile (CH3CN): CH3NC (g)→ CH3CN (g)
The dependence of the rate constant on temperature is studied and the graph below is prepared from the results.   The energy of activation of this reaction is __________ kJ/mol.

Accepted Answer

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

Question 5

The rate constant for a second-order reaction is 0.13 M-1s-1. If the initial concentration of reactant is 0.26 mol/L, it takes __________ s for the concentration to decrease to 0.11 mol/L.

Accepted Answer

A) 0.017 
B) 0.68 
C) 9.1 
D) 40. 
E) 5.2 
A) 0.017 
B) 0.68 
C) 9.1 
D) 40. 
E) 5.2

Question 6

A compound decomposes by a first-order process. If 17.0% of the compound decomposes in 60.0 minutes, the half-life of the compound is __________.

Accepted Answer

A) 141 minutes 
B) 181 minutes 
C) 198 minutes 
D) 223 minutes 
E) 325 minutes 
A) 141 minutes 
B) 181 minutes 
C) 198 minutes 
D) 223 minutes 
E) 325 minutes

Question 7

Rates of reaction can be positive or negative.

Accepted Answer

A) True 
 B)False

Question 8

The order of the reaction in A is __________.

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 0 
A) 1 
B) 2 
C) 3 
D) 4 
E) 0

Question 9

The rate of disappearance of HBr in the gas phase reaction 2HBr (g)→ H2 (g)+ Br2 (g)
Is 0.301 Ms-1 at 150°C. The rate of appearance of Br2 is __________ Ms-1.

Accepted Answer

A) 1.66 
B) 0.151 
C) 0.0906 
D) 0.602 
E) 0.549 
A) 1.66 
B) 0.151 
C) 0.0906 
D) 0.602 
E) 0.549

Question 10

Elementary reactions involving the simultaneous collision of three molecules are __________.

Accepted Answer

The answer of Elementary reactions involving the simultaneous collision of...

Question 11

__________ are used in automotive catalytic converters.

Accepted Answer

A) Heterogeneous catalysts 
B) Homogeneous catalysts 
C) Enzymes 
D) Noble gases 
E) Nonmetal oxides 
A) Heterogeneous catalysts 
B) Homogeneous catalysts 
C) Enzymes 
D) Noble gases 
E) Nonmetal oxides

Question 12

Nitrogen fixation is a difficult process because __________.

Accepted Answer

A) there is so little nitrogen in the atmosphere 
B) nitrogen exists in the atmosphere primarily as its oxides which are very unreactive 
C) nitrogen is very unreactive, largely due to its triple bond 
D) of the extreme toxicity of nitrogen 
E) of the high polarity of nitrogen molecules preventing them from dissolving in biological fluids, such as those inside cells 
A) there is so little nitrogen in the atmosphere 
B) nitrogen exists in the atmosphere primarily as its oxides which are very unreactive 
C) nitrogen is very unreactive, largely due to its triple bond 
D) of the extreme toxicity of nitrogen 
E) of the high polarity of nitrogen molecules preventing them from dissolving in biological fluids, such as those inside cells

Question 13

The overall order of a reaction is 2. The units of the rate constant for the reaction are __________.

Accepted Answer

A) M/s 
B) M-1s-1 
C) 1/s 
D) 1/M 
E) s/M2 
A) M/s 
B) M-1s-1 
C) 1/s 
D) 1/M 
E) s/M2

Question 14

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 15

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 16

The reaction 2NO2 → 2NO + O2
Follows second-order kinetics. At 300°C, [NO2] drops from 0.0100 M to 0.00650 M in 100.0 s. The rate constant for the reaction is __________ M-1s-1.

Accepted Answer

A) 0.096 
B) 0.65 
C) 0.81 
D) 1.2 
E) 0.54 
A) 0.096 
B) 0.65 
C) 0.81 
D) 1.2 
E) 0.54

Question 17

Of the following, all are valid units for a reaction rate except __________.

Accepted Answer

A) mol/L 
B) M/s 
C) mol/hr 
D) g/s 
E) mol/L-hr 
A) mol/L 
B) M/s 
C) mol/hr 
D) g/s 
E) mol/L-hr

Question 18

The graph shown below depicts the relationship between concentration and time for the following chemical reaction.   The slope of this line is equal to __________.

Accepted Answer

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

Question 19

Units of the rate constant of a reaction are independent of the overall reaction order.

Accepted Answer

A) True 
 B)False

Question 20

How many moles of B are present at 10 s?

Accepted Answer

A) 0.011 
B) 0.220 
C) 0.110 
D) 0.014 
E) 1.4 × 10-3 
A) 0.011 
B) 0.220 
C) 0.110 
D) 0.014 
E) 1.4 × 10-3

Exam 14: Chemical Kinetics

What is the overall order of the reaction?

The kinetics of the reaction below were studied and it was determined that the reaction rate increased by a factor of 9 when the concentration of B was tripled. The reaction is __________ order in B. A + B → P

In the Arrhenius equation, k = Ae-Ea/RT __________ is the frequency factor.

At elevated temperatures, methylisonitrile (CH3NC)isomerizes to acetonitrile (CH3CN): CH3NC (g)→ CH3CN (g) The dependence of the rate constant on temperature is studied and the graph below is prepared from the results. The energy of activation of this reaction is __________ kJ/mol.

The rate constant for a second-order reaction is 0.13 M-1s-1. If the initial concentration of reactant is 0.26 mol/L, it takes __________ s for the concentration to decrease to 0.11 mol/L.

A compound decomposes by a first-order process. If 17.0% of the compound decomposes in 60.0 minutes, the half-life of the compound is __________.

Rates of reaction can be positive or negative.

The order of the reaction in A is __________.

The rate of disappearance of HBr in the gas phase reaction 2HBr (g)→ H2 (g)+ Br2 (g) Is 0.301 Ms-1 at 150°C. The rate of appearance of Br2 is __________ Ms-1.

Elementary reactions involving the simultaneous collision of three molecules are __________.

__________ are used in automotive catalytic converters.

Nitrogen fixation is a difficult process because __________.

The overall order of a reaction is 2. The units of the rate constant for the reaction are __________.

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 __________.

The reaction 2NO2 → 2NO + O2 Follows second-order kinetics. At 300°C, [NO2] drops from 0.0100 M to 0.00650 M in 100.0 s. The rate constant for the reaction is __________ M-1s-1.

Of the following, all are valid units for a reaction rate except __________.

The graph shown below depicts the relationship between concentration and time for the following chemical reaction. The slope of this line is equal to __________.

Units of the rate constant of a reaction are independent of the overall reaction order.

How many moles of B are present at 10 s?

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Stoichiometry: Calculations With Chemical Formulas and Equations

Aqueous Reactions and Solution Stoichiometry

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

In the Arrhenius equation, k = Ae^-Ea/RT __________ is the frequency factor.

At elevated temperatures, methylisonitrile (CH₃NC)isomerizes to acetonitrile (CH₃CN): CH₃NC (g)→ CH₃CN (g) The dependence of the rate constant on temperature is studied and the graph below is prepared from the results. The energy of activation of this reaction is __________ kJ/mol.

The rate constant for a second-order reaction is 0.13 M^-1s^-1. If the initial concentration of reactant is 0.26 mol/L, it takes __________ s for the concentration to decrease to 0.11 mol/L.

The rate of disappearance of HBr in the gas phase reaction 2HBr (g)→ H₂ (g)+ Br₂ (g) Is 0.301 Ms^-1 at 150°C. The rate of appearance of Br₂ is __________ Ms^-1.

The reaction 2NO₂ → 2NO + O₂ Follows second-order kinetics. At 300°C, [NO₂] drops from 0.0100 M to 0.00650 M in 100.0 s. The rate constant for the reaction is __________ M^-1s^-1.