Question 1

For each of the following terms/concepts,give a brief explanation or definition.

Accepted Answer

a.order of a reaction b.elementary react

Question 2

What is defined as the minimum amount of energy required to initiate a chemical reaction?

Accepted Answer

A) Collision energy 
B) Effective collision energy 
C) Reaction energy 
D) Activation energy 
E) Rate energy 
A) Collision energy 
B) Effective collision energy 
C) Reaction energy 
D) Activation energy 
E) Rate energy

Question 3

Sulfuryl chloride,SO2Cl2(g),decomposes at high temperature to form SO2(g)and Cl2(g).The rate constant at a certain temperature is 4.68 × 10-5 s-1.What is the order of the reaction?

Accepted Answer

A) Zero 
B) First 
C) Second 
D) Third 
E) More information is needed to determine the overall order. 
A) Zero 
B) First 
C) Second 
D) Third 
E) More information is needed to determine the overall order.

Question 4

For the reaction C6H14(g)→ C6H6(g)+ 4H2(g),ΔP(H2)/Δt was found to be 2.5 × 10-2 atm/s, where ΔP(H2)is the change in pressure of hydrogen.Determine ΔP(C6H14)/Δt for this reaction at the same time.

Accepted Answer

A) 2.5 × 10-2 atm/s 
B) -6.3 × 10-3 atm/s 
C) -2.5 × 10-2 atm/s 
D) 0.10 atm/s 
E) 6.3 × 10-3 atm/s 
A) 2.5 × 10-2 atm/s 
B) -6.3 × 10-3 atm/s 
C) -2.5 × 10-2 atm/s 
D) 0.10 atm/s 
E) 6.3 × 10-3 atm/s

Question 5

What is the molecularity of the following elementary reaction? NHCl2(aq)+ OH-(aq)→ NCl2-(aq)+ H2O(l)

Accepted Answer

A) Unimolecular 
B) Bimolecular 
C) Termolecular 
D) Tetramolecular 
E) The reaction order is needed before the molecularity can be determined. 
A) Unimolecular 
B) Bimolecular 
C) Termolecular 
D) Tetramolecular 
E) The reaction order is needed before the molecularity can be determined.

Question 6

A reactant R is being consumed in a first-order reaction.What fraction of the initial R is consumed in 4.0 half-lives?

Accepted Answer

A) 0.94 
B) 0.88 
C) 0.75 
D) 0.13 
E) 0.063 
A) 0.94 
B) 0.88 
C) 0.75 
D) 0.13 
E) 0.063

Question 7

Which is true concerning the following potential energy diagram?

Accepted Answer

A) This reaction is exothermic and has a positive activation energy. 
B) This reaction is endothermic and has a positive activation energy. 
C) This reaction is exothermic and has a negative activation energy. 
D) This reaction is endothermic and has a negative activation energy. 
E) This reaction is thermoneutral and has a zero activation energy. 
A) This reaction is exothermic and has a positive activation energy. 
B) This reaction is endothermic and has a positive activation energy. 
C) This reaction is exothermic and has a negative activation energy. 
D) This reaction is endothermic and has a negative activation energy. 
E) This reaction is thermoneutral and has a zero activation energy.

Question 8

What is the activation energy for a reaction if k = 1.89 × 10-8 s-1 at 540.K and k = 2.45 × 10-7 s-1 at 601 K?

Accepted Answer

A) 113 kJ/mol 
B) 83 kJ/mol 
C) 410 kJ/mol 
D) 280 kJ/mol 
E) 580 kJ/mol 
A) 113 kJ/mol 
B) 83 kJ/mol 
C) 410 kJ/mol 
D) 280 kJ/mol 
E) 580 kJ/mol

Question 9

In the collision theory of reaction rates,the rate constant for a bimolecular reaction can be written as k = A•exp(-Ea/RT)
Briefly explain the physical meaning (interpretation)of the following factors which appear in the above expression:
a.A
b.exp(-Ea/RT)

Accepted Answer

a.the collision frequency or t

Question 10

What is the half-life for a second-order reaction?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 11

The following diagram represents the first-order decomposition of A to form X according to the following balanced chemical equation: A → X.Each sphere represents 1.0 mmol of atoms,and the volume of the box is 1.0 L.   What is the half-life of the reaction?

Accepted Answer

A) 15 s 
B) 30 s 
C) 36 s 
D) 45 s 
E) 60 s 
A) 15 s 
B) 30 s 
C) 36 s 
D) 45 s 
E) 60 s

Question 12

Which equation best describes the average rate for the reaction shown? A(aq)+ B(aq)→ C(aq)+ D(aq)

Accepted Answer

A) rate = [C][D]
[A][B] 
B) rate = +Δ[B]/Δt 
C) rate = -Δ[C]/Δt 
D) rate = -Δ[A]/Δt 
E) rate = [A][B]
[C][D] 
A) rate = [C][D]
[A][B] 
B) rate = +Δ[B]/Δt 
C) rate = -Δ[C]/Δt 
D) rate = -Δ[A]/Δt 
E) rate = [A][B]
[C][D]

Question 13

When the reaction A → B + C is studied,a plot of ln[A]t vs.time gives a straight line with a negative slope.What is the order of the reaction with respect to A?

Accepted Answer

A) Zero 
B) First 
C) Second 
D) Third 
E) More information is needed to determine the order. 
A) Zero 
B) First 
C) Second 
D) Third 
E) More information is needed to determine the order.

Question 14

The following is an Arrhenius plot of a first-order reaction.The rate constant is measured in units of s-1.   Based on this Arrhenius plot,what is the activation energy of the reaction? (R = 8.314 J/K •mol)

Accepted Answer

A) 4.0 kJ/mol 
B) 5.0 kJ/mol 
C) 40 kJ/mol 
D) 42 kJ/mol 
E) 50 kJ/mol 
A) 4.0 kJ/mol 
B) 5.0 kJ/mol 
C) 40 kJ/mol 
D) 42 kJ/mol 
E) 50 kJ/mol

For each of the following terms/concepts,give a brief explanation or definition.

What is defined as the minimum amount of energy required to initiate a chemical reaction?

Sulfuryl chloride,SO₂Cl₂(g),decomposes at high temperature to form SO₂(g)and Cl₂(g).The rate constant at a certain temperature is 4.68 × 10^-5 s^-1.What is the order of the reaction?

For the reaction C₆H₁₄(g)→ C₆H₆(g)+ 4H₂(g),ΔP(H₂)/Δt was found to be 2.5 × 10^-2 atm/s, where ΔP(H₂)is the change in pressure of hydrogen.Determine ΔP(C₆H₁₄)/Δt for this reaction at the same time.

What is the molecularity of the following elementary reaction? NHCl₂(aq)+ OH^-(aq)→ NCl₂^-(aq)+ H₂O(l)

A reactant R is being consumed in a first-order reaction.What fraction of the initial R is consumed in 4.0 half-lives?

Which is true concerning the following potential energy diagram?

What is the activation energy for a reaction if k = 1.89 × 10^-8 s^-1 at 540.K and k = 2.45 × 10^-7s^-1 at 601 K?

In the collision theory of reaction rates,the rate constant for a bimolecular reaction can be written as k = A•exp(-E_a/RT) Briefly explain the physical meaning (interpretation)of the following factors which appear in the above expression: a.A b.exp(-E_a/RT)

What is the half-life for a second-order reaction?

The following diagram represents the first-order decomposition of A to form X according to the following balanced chemical equation: A → X.Each sphere represents 1.0 mmol of atoms,and the volume of the box is 1.0 L. What is the half-life of the reaction?

Which equation best describes the average rate for the reaction shown? A(aq)+ B(aq)→ C(aq)+ D(aq)

When the reaction A → B + C is studied,a plot of ln[A]t vs.time gives a straight line with a negative slope.What is the order of the reaction with respect to A?

The following is an Arrhenius plot of a first-order reaction.The rate constant is measured in units of s^-1. Based on this Arrhenius plot,what is the activation energy of the reaction? (R = 8.314 J/K •mol)

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

Exam 14: Chemical Kinetics

For each of the following terms/concepts,give a brief explanation or definition.

What is defined as the minimum amount of energy required to initiate a chemical reaction?

Sulfuryl chloride,SO2Cl2(g),decomposes at high temperature to form SO2(g)and Cl2(g).The rate constant at a certain temperature is 4.68 × 10-5 s-1.What is the order of the reaction?

For the reaction C6H14(g)→ C6H6(g)+ 4H2(g),ΔP(H2)/Δt was found to be 2.5 × 10-2 atm/s, where ΔP(H2)is the change in pressure of hydrogen.Determine ΔP(C6H14)/Δt for this reaction at the same time.

What is the molecularity of the following elementary reaction? NHCl2(aq)+ OH-(aq)→ NCl2-(aq)+ H2O(l)

A reactant R is being consumed in a first-order reaction.What fraction of the initial R is consumed in 4.0 half-lives?

Which is true concerning the following potential energy diagram?

What is the activation energy for a reaction if k = 1.89 × 10-8 s-1 at 540.K and k = 2.45 × 10-7 s-1 at 601 K?

In the collision theory of reaction rates,the rate constant for a bimolecular reaction can be written as k = A•exp(-Ea/RT) Briefly explain the physical meaning (interpretation)of the following factors which appear in the above expression: a.A b.exp(-Ea/RT)

What is the half-life for a second-order reaction?

The following diagram represents the first-order decomposition of A to form X according to the following balanced chemical equation: A → X.Each sphere represents 1.0 mmol of atoms,and the volume of the box is 1.0 L. What is the half-life of the reaction?

Which equation best describes the average rate for the reaction shown? A(aq)+ B(aq)→ C(aq)+ D(aq)

When the reaction A → B + C is studied,a plot of ln[A]t vs.time gives a straight line with a negative slope.What is the order of the reaction with respect to A?

The following is an Arrhenius plot of a first-order reaction.The rate constant is measured in units of s-1. Based on this Arrhenius plot,what is the activation energy of the reaction? (R = 8.314 J/K •mol)

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

Sulfuryl chloride,SO₂Cl₂(g),decomposes at high temperature to form SO₂(g)and Cl₂(g).The rate constant at a certain temperature is 4.68 × 10^-5 s^-1.What is the order of the reaction?

For the reaction C₆H₁₄(g)→ C₆H₆(g)+ 4H₂(g),ΔP(H₂)/Δt was found to be 2.5 × 10^-2 atm/s, where ΔP(H₂)is the change in pressure of hydrogen.Determine ΔP(C₆H₁₄)/Δt for this reaction at the same time.

What is the molecularity of the following elementary reaction? NHCl₂(aq)+ OH^-(aq)→ NCl₂^-(aq)+ H₂O(l)

What is the activation energy for a reaction if k = 1.89 × 10^-8 s^-1 at 540.K and k = 2.45 × 10^-7s^-1 at 601 K?

In the collision theory of reaction rates,the rate constant for a bimolecular reaction can be written as k = A•exp(-E_a/RT) Briefly explain the physical meaning (interpretation)of the following factors which appear in the above expression: a.A b.exp(-E_a/RT)

The following is an Arrhenius plot of a first-order reaction.The rate constant is measured in units of s^-1. Based on this Arrhenius plot,what is the activation energy of the reaction? (R = 8.314 J/K •mol)