Question 1

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 2

Ammonium cyanate (NH4CNO)reacts to form urea (NH2CONH2).At 65°C the rate constant,k,is 3.60 L mol-1s-1.What is the rate law for this reaction?

Accepted Answer

A) Rate = 3.60 L mol-1s-1[NH4CNO] 
B) Rate = 3.60 L mol-1s-1[NH4CNO]2 
C) Rate = 0.28 mol L-1 s-1[NH4CNO] 
D) Rate = 0.28 mol L-1 s-1[NH4CNO]2 
E) Rate = 3.60 L mol-1s-1[NH2CONH2]-1 
A) Rate = 3.60 L mol-1s-1[NH4CNO] 
B) Rate = 3.60 L mol-1s-1[NH4CNO]2 
C) Rate = 0.28 mol L-1 s-1[NH4CNO] 
D) Rate = 0.28 mol L-1 s-1[NH4CNO]2 
E) Rate = 3.60 L mol-1s-1[NH2CONH2]-1

Question 3

Cyclopropane is converted to propene in a first-order process.The rate constant is 5.4 $\times$ 10-2 hr-1.If the initial concentration of cyclopropane is 0.150 M,what will its concentration be after 22.0 hours?

Accepted Answer

A) 0.0457 M 
B) 0.105 M 
C) 0.127 M 
D) 0.492 M 
E) None of these choices is correct. 
A) 0.0457 M 
B) 0.105 M 
C) 0.127 M 
D) 0.492 M 
E) None of these choices is correct.

Question 4

When a catalyst is added to a reaction mixture,it

Accepted Answer

A) increases the rate of collisions between reactant molecules. 
B) provides reactant molecules with more energy. 
C) slows down the rate of the back reaction. 
D) provides a new pathway (mechanism)for the reaction. 
E) does none of these 
A) increases the rate of collisions between reactant molecules. 
B) provides reactant molecules with more energy. 
C) slows down the rate of the back reaction. 
D) provides a new pathway (mechanism)for the reaction. 
E) does none of these

Question 5

All second-order reactions are bimolecular reactions.

Accepted Answer

A) True 
 B)False

Question 6

Dinitrogen tetraoxide,N2O4,decomposes to nitrogen dioxide,NO2,in a first-order process.If k = 2.5 $\times$ 103 s-1 at -5°C and k = 3.5 $\times$ 104 s-1 at 25°C,what is the activation energy for the decomposition?

Accepted Answer

A) 0.73 kJ/mol 
B) 58 kJ/mol 
C) 140 kJ/mol 
D) 580 kJ/mol 
E) > 1000 kJ/mol 
A) 0.73 kJ/mol 
B) 58 kJ/mol 
C) 140 kJ/mol 
D) 580 kJ/mol 
E) > 1000 kJ/mol

Question 7

Consider the following reaction
8A(g)+ 5B(g) $\to$ 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 these choices is correct,since its rate of change must be positive. 
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 these choices is correct,since its rate of change must be positive.

Question 8

The decomposition of dinitrogen pentaoxide has an activation energy of 102 kJ/mol and $\Delta$H°rxn = + 55 kJ/mol.What is the activation energy for the reverse reaction?

Accepted Answer

A) 27 kJ/mol 
B) 47 kJ/mol 
C) 55 kJ/mol 
D) 102 kJ/mol 
E) More information is needed,since this is a Hess' Law calculation. 
A) 27 kJ/mol 
B) 47 kJ/mol 
C) 55 kJ/mol 
D) 102 kJ/mol 
E) More information is needed,since this is a Hess' Law calculation.

Question 9

A catalyst accelerates a reaction because

Accepted Answer

A) it increases the number of molecules with energy equal to or greater than the activation energy. 
B) it lowers the activation energy for the reaction. 
C) it increases the number of collisions between molecules. 
D) it increases the temperature of the molecules in the reaction. 
E) it supplies energy to reactant molecules. 
A) it increases the number of molecules with energy equal to or greater than the activation energy. 
B) it lowers the activation energy for the reaction. 
C) it increases the number of collisions between molecules. 
D) it increases the temperature of the molecules in the reaction. 
E) it supplies energy to reactant molecules.

Question 10

A reaction has an activation energy of 195.0 kJ/mol.When the temperature is increased from 200.°C to 220.°C,the rate constant will increase by a factor of

Accepted Answer

A) 1.1 
B) 4.3 $\times$ 104 
C) 3.2 
D) 7.5 
E) None of these choices is correct. 
A) 1.1 
B) 4.3 $\times$ 104 
C) 3.2 
D) 7.5 
E) None of these choices is correct.

Question 11

The reaction CH3NC(g) $\to$ CH3CN(g)is first-order with respect to methyl isocyanide,CH3NC.If it takes 10.3 minutes for exactly one quarter of the initial amount of methyl isocyanide to react,what is the rate constant in units of min-1?

Accepted Answer

A) -0.135 min-1 
B) 0.0279 min-1 
C) 0.089 min-1 
D) 0.135 min-1 
E) 35.8 min-1 
A) -0.135 min-1 
B) 0.0279 min-1 
C) 0.089 min-1 
D) 0.135 min-1 
E) 35.8 min-1

Question 12

The radioactive isotope tritium decays with a first-order rate constant k of 0.056 year-1.What fraction of the tritium initially in a sample is still present 30 years later?

Accepted Answer

A) 0.19 
B) 0.60 
C) 0.15 
D) 2.8 $\times$ 10-38 
E) None of these choices is correct. 
A) 0.19 
B) 0.60 
C) 0.15 
D) 2.8 $\times$ 10-38 
E) None of these choices is correct.

Question 13

For the reaction
3A(g)+ 2B(g) $\to$ 2C(g)+ 2D(g)
The following data was collected at constant temperature.Determine the correct rate law for this reaction.

Accepted Answer

A) Rate = k[A][B] 
B) Rate = k[A][B]2 
C) Rate = k[A]3[B]2 
D) Rate = k[A]1.5[B] 
E) Rate = k[A]2[B] 
A) Rate = k[A][B] 
B) Rate = k[A][B]2 
C) Rate = k[A]3[B]2 
D) Rate = k[A]1.5[B] 
E) Rate = k[A]2[B]

Question 14

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 $\times$ 10-5s-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 order. 
A) zero 
B) first 
C) second 
D) third 
E) More information is needed to determine the order.

Question 15

The rate constant for a reaction is 4.65 L mol-1s-1.What is the overall 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 16

Ammonia will react with oxygen in the presence of a copper catalyst to form nitrogen and water.From 164.5°C to 179.0°C,the rate constant increases by a factor of 4.27.What is the activation energy of this oxidation reaction?

Accepted Answer

A) 24.5 kJ/mol 
B) 165 kJ/mol 
C) 242 kJ/mol 
D) 1630 kJ/mol 
E) > 104 kJ/mol 
A) 24.5 kJ/mol 
B) 165 kJ/mol 
C) 242 kJ/mol 
D) 1630 kJ/mol 
E) > 104 kJ/mol

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

Ammonium cyanate (NH₄CNO)reacts to form urea (NH₂CONH₂).At 65°C the rate constant,k,is 3.60 L mol^-1s^-1.What is the rate law for this reaction?

Cyclopropane is converted to propene in a first-order process.The rate constant is 5.4 $\times$ 10^-2 hr^-1.If the initial concentration of cyclopropane is 0.150 M,what will its concentration be after 22.0 hours?

When a catalyst is added to a reaction mixture,it

All second-order reactions are bimolecular reactions.

Dinitrogen tetraoxide,N₂O₄,decomposes to nitrogen dioxide,NO₂,in a first-order process.If k = 2.5 $\times$ 10³ s^-1 at -5°C and k = 3.5 $\times$ 10⁴ s^-1 at 25°C,what is the activation energy for the decomposition?

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

The decomposition of dinitrogen pentaoxide has an activation energy of 102 kJ/mol and $\Delta$ H°_rxn = + 55 kJ/mol.What is the activation energy for the reverse reaction?

A catalyst accelerates a reaction because

A reaction has an activation energy of 195.0 kJ/mol.When the temperature is increased from 200.°C to 220.°C,the rate constant will increase by a factor of

The reaction CH₃NC(g) $\to$ CH₃CN(g)is first-order with respect to methyl isocyanide,CH₃NC.If it takes 10.3 minutes for exactly one quarter of the initial amount of methyl isocyanide to react,what is the rate constant in units of min^-1?

The radioactive isotope tritium decays with a first-order rate constant k of 0.056 year^-1.What fraction of the tritium initially in a sample is still present 30 years later?

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 $\times$ 10^-5s^-1.What is the order of the reaction?

The rate constant for a reaction is 4.65 L mol^-1s^-1.What is the overall order of the reaction?

Ammonia will react with oxygen in the presence of a copper catalyst to form nitrogen and water.From 164.5°C to 179.0°C,the rate constant increases by a factor of 4.27.What is the activation energy of this oxidation reaction?

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids,solids,and Phase Changes

The Properties of Solutions

The Main-Group Elements: Applying Principles of Bonding and Structure

Organic Compounds and the Atomic Properties of Carbon

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Exam 16: Kinetics: Rates and Mechanisms of Chemical Reactions

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

Ammonium cyanate (NH4CNO)reacts to form urea (NH2CONH2).At 65°C the rate constant,k,is 3.60 L mol-1s-1.What is the rate law for this reaction?

Cyclopropane is converted to propene in a first-order process.The rate constant is 5.4 ×\times× 10-2 hr-1.If the initial concentration of cyclopropane is 0.150 M,what will its concentration be after 22.0 hours?

When a catalyst is added to a reaction mixture,it

All second-order reactions are bimolecular reactions.

Dinitrogen tetraoxide,N2O4,decomposes to nitrogen dioxide,NO2,in a first-order process.If k = 2.5 ×\times× 103 s-1 at -5°C and k = 3.5 ×\times× 104 s-1 at 25°C,what is the activation energy for the decomposition?

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

The decomposition of dinitrogen pentaoxide has an activation energy of 102 kJ/mol and Δ\DeltaΔ H°rxn = + 55 kJ/mol.What is the activation energy for the reverse reaction?

A catalyst accelerates a reaction because

A reaction has an activation energy of 195.0 kJ/mol.When the temperature is increased from 200.°C to 220.°C,the rate constant will increase by a factor of

The reaction CH3NC(g) →\to→ CH3CN(g)is first-order with respect to methyl isocyanide,CH3NC.If it takes 10.3 minutes for exactly one quarter of the initial amount of methyl isocyanide to react,what is the rate constant in units of min-1?

The radioactive isotope tritium decays with a first-order rate constant k of 0.056 year-1.What fraction of the tritium initially in a sample is still present 30 years later?

For the reaction 3A(g)+ 2B(g) →\to→ 2C(g)+ 2D(g) The following data was collected at constant temperature.Determine the correct rate law for this 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 ×\times× 10-5s-1.What is the order of the reaction?

The rate constant for a reaction is 4.65 L mol-1s-1.What is the overall order of the reaction?

Ammonia will react with oxygen in the presence of a copper catalyst to form nitrogen and water.From 164.5°C to 179.0°C,the rate constant increases by a factor of 4.27.What is the activation energy of this oxidation reaction?

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids,solids,and Phase Changes

The Properties of Solutions

The Main-Group Elements: Applying Principles of Bonding and Structure

Organic Compounds and the Atomic Properties of Carbon

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Ammonium cyanate (NH₄CNO)reacts to form urea (NH₂CONH₂).At 65°C the rate constant,k,is 3.60 L mol^-1s^-1.What is the rate law for this reaction?

Cyclopropane is converted to propene in a first-order process.The rate constant is 5.4 $\times$ 10^-2 hr^-1.If the initial concentration of cyclopropane is 0.150 M,what will its concentration be after 22.0 hours?

Dinitrogen tetraoxide,N₂O₄,decomposes to nitrogen dioxide,NO₂,in a first-order process.If k = 2.5 $\times$ 10³ s^-1 at -5°C and k = 3.5 $\times$ 10⁴ s^-1 at 25°C,what is the activation energy for the decomposition?

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

The decomposition of dinitrogen pentaoxide has an activation energy of 102 kJ/mol and $\Delta$ H°_rxn = + 55 kJ/mol.What is the activation energy for the reverse reaction?

The reaction CH₃NC(g) $\to$ CH₃CN(g)is first-order with respect to methyl isocyanide,CH₃NC.If it takes 10.3 minutes for exactly one quarter of the initial amount of methyl isocyanide to react,what is the rate constant in units of min^-1?

The radioactive isotope tritium decays with a first-order rate constant k of 0.056 year^-1.What fraction of the tritium initially in a sample is still present 30 years later?

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 $\times$ 10^-5s^-1.What is the order of the reaction?

The rate constant for a reaction is 4.65 L mol^-1s^-1.What is the overall order of the reaction?