Question 1

The half-life of a first-order reaction is 13 min.If the initial concentration of reactant is   it takes   for it to decrease to 0.085 M.

Accepted Answer

A) 12 
B) 10. 
C) 8.0 
D) 11 
E) 7.0 
A) 12 
B) 10. 
C) 8.0 
D) 11 
E) 7.0 C

Question 2

The elementary reaction 2NO2 (g)→ 2NO (g)+ O2 (g)
Is second order in   and the rate constant at 660 K is 5.23     .The reaction half-life at this temperature when   = 0.45 M is ________ s.

Accepted Answer

A) 2.4 
B) 7.6 
C) 0.19 
D) 0.13 
E) 0.42 
A) 2.4 
B) 7.6 
C) 0.19 
D) 0.13 
E) 0.42 E

Question 3

Rates of reaction can be positive or negative.

Accepted Answer

A) True 
 B)False  False

Question 4

A second-order reaction has a half-life of 12 s when the initial concentration of reactant is 0.98 M.The rate constant for this reaction is ________ M-1s-1.

Accepted Answer

A) 12 
B) 2.0 × 10-2 
C) 8.5 × 10-2 
D) 4.3 × 10-2 
E) 4.3 
A) 12 
B) 2.0 × 10-2 
C) 8.5 × 10-2 
D) 4.3 × 10-2 
E) 4.3

Question 5

Define activation energy.

Accepted Answer

the minimum energy r

Question 6

If a rate law is first order (reactant),doubling the reactant ________ the reaction rate.

Accepted Answer

The answer of If a rate law is first order...

Question 7

What is the order of the reaction in B?

Accepted Answer

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

Question 8

The rate constant of a first-order process that has a half-life of 3.50 min is ________ s-1.

Accepted Answer

A) 0.693 
B) 1.65 × 10-2 
C) 1.98 
D) 0.198 
E) 3.30 ×10-3 
A) 0.693 
B) 1.65 × 10-2 
C) 1.98 
D) 0.198 
E) 3.30 ×10-3

Question 9

decomposes in the gas phase by the reaction SO2Cl2 (g)→ SO2 (g)+ Cl2 (g)
The reaction is first order in SO2Cl2 and the rate constant is 3.0 ×     at 600 K.A vessel is charged with 3.6 atm of SO2Cl2 at 600 K.The partial pressure of SO2Cl2 at   is ________ atm.

Accepted Answer

A) 0.85 
B) 3.2 
C) 1.5 
D) 0.19 
E) 9.3 × 104 
A) 0.85 
B) 3.2 
C) 1.5 
D) 0.19 
E) 9.3 × 104

Question 10

The enzyme ________ converts nitrogen into ammonia.

Accepted Answer

A) oxygenase 
B) hydrogenase 
C) oxidase 
D) nitroglycerine 
E) nitrogenase 
A) oxygenase 
B) hydrogenase 
C) oxidase 
D) nitroglycerine 
E) nitrogenase

Question 11

Of the following,________ will lower the activation energy for a reaction.

Accepted Answer

A) increasing the concentrations of reactants 
B) raising the temperature of the reaction 
C) adding a catalyst for the reaction 
D) removing products as the reaction proceeds 
E) increasing the pressure 
A) increasing the concentrations of reactants 
B) raising the temperature of the reaction 
C) adding a catalyst for the reaction 
D) removing products as the reaction proceeds 
E) increasing the pressure

Question 12

Fe and Mo are transition metals found in the cofactor active site of ________.

Accepted Answer

A) hydrogenase 
B) nitrogenase 
C) oxidase 
D) nitroglycerine 
E) oxygenase 
A) hydrogenase 
B) nitrogenase 
C) oxidase 
D) nitroglycerine 
E) oxygenase

Question 13

The reaction CH3-N≡C → CH3-C≡N
Is a first-order reaction.At     If   is 1.00 × 10-3 initially,   is ________ M after

Accepted Answer

A) 5.33 × 10-4 
B) 2.34 × 10-4 
C) 1.88 × 10-3 
D) 4.27 × 10-3 
E) 1.00 × 10-6 
A) 5.33 × 10-4 
B) 2.34 × 10-4 
C) 1.88 × 10-3 
D) 4.27 × 10-3 
E) 1.00 × 10-6

Question 14

A compound decomposes by a first-order process.If 13% of the compound decomposes in 60 minutes,the half-life of the compound is ________ min.

Accepted Answer

A) 299 
B) 20 
C) 12 
D) -18 
E) -5 
A) 299 
B) 20 
C) 12 
D) -18 
E) -5

Question 15

At elevated temperatures,dinitrogen pentoxide decomposes to nitrogen dioxide and oxygen: 2N2O5(g)→ 4NO2 (g)+ O2 (g)
When the rate of formation of NO2 is 5.5 × 10-4 M/s,the rate of decomposition of N2O5 is ________ M/s.

Accepted Answer

A) 2.2 × 10-3 
B) 1.4 × 10-4 
C) 10.1 × 10-4 
D) 2.8 × 10-4 
E) 5.5 × 10-4 
A) 2.2 × 10-3 
B) 1.4 × 10-4 
C) 10.1 × 10-4 
D) 2.8 × 10-4 
E) 5.5 × 10-4

Question 16

What is the magnitude of k for a first-order reaction at 75.0 °C if   and rate constant is 1.35 ×     at 25.0 °C?

Accepted Answer

A) 3.36 × 104 
B) 3.85 ×   
C) 745 
D) 4.28 ×   
E) 1.36 ×   
A) 3.36 × 104 
B) 3.85 ×   
C) 745 
D) 4.28 ×   
E) 1.36 ×

Question 17

For the elementary reaction NO3 + CO → NO2 + CO2
The molecularity of the reaction is ________,and the rate law is

Accepted Answer

A) 2, k[NO3][CO] 
B) 4, k[NO3][CO][NO2][CO2] 
C) 2, k[NO2][CO2] 
D) 2, k[NO3][CO]/[NO2][CO2] 
E) 4, k[NO2][CO2]/[NO3][CO] 
A) 2, k[NO3][CO] 
B) 4, k[NO3][CO][NO2][CO2] 
C) 2, k[NO2][CO2] 
D) 2, k[NO3][CO]/[NO2][CO2] 
E) 4, k[NO2][CO2]/[NO3][CO]

Question 18

Which of the following is correct regarding the overall order of the reaction?

Accepted Answer

A) the overall order is found by subtracting the individual orders for ClO2 and OH-, so it is 1 for this reaction 
B) the overall order for this reaction is based on the individual order for OH-, so it is 1 
C) the overall order is found by adding the individual orders for ClO2 and OH-, so it is 3 for this reaction 
D) the overall order for this reaction is based on the individual order for ClO2, so it is 2 
E) the overall order cannot be determined 
A) the overall order is found by subtracting the individual orders for ClO2 and OH-, so it is 1 for this reaction 
B) the overall order for this reaction is based on the individual order for OH-, so it is 1 
C) the overall order is found by adding the individual orders for ClO2 and OH-, so it is 3 for this reaction 
D) the overall order for this reaction is based on the individual order for ClO2, so it is 2 
E) the overall order cannot be determined

Question 19

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 20

The average rate of disappearance of A between 10 s and 20 s is ________ mol/s.

Accepted Answer

A) 2.2 × 10-3 
B) 1.1 × 10-3 
C) 4.4 × 10-3 
D) 454 
E) 9.90 × 10-3 
A) 2.2 × 10-3 
B) 1.1 × 10-3 
C) 4.4 × 10-3 
D) 454 
E) 9.90 × 10-3

Exam 14: Chemical Kinetics

The half-life of a first-order reaction is 13 min.If the initial concentration of reactant is it takes for it to decrease to 0.085 M.

The elementary reaction 2NO2 (g)→ 2NO (g)+ O2 (g) Is second order in and the rate constant at 660 K is 5.23 .The reaction half-life at this temperature when = 0.45 M is ________ s.

Rates of reaction can be positive or negative.

A second-order reaction has a half-life of 12 s when the initial concentration of reactant is 0.98 M.The rate constant for this reaction is ________ M-1s-1.

Define activation energy.

If a rate law is first order (reactant),doubling the reactant ________ the reaction rate.

What is the order of the reaction in B?

The rate constant of a first-order process that has a half-life of 3.50 min is ________ s-1.

decomposes in the gas phase by the reaction SO2Cl2 (g)→ SO2 (g)+ Cl2 (g) The reaction is first order in SO2Cl2 and the rate constant is 3.0 × at 600 K.A vessel is charged with 3.6 atm of SO2Cl2 at 600 K.The partial pressure of SO2Cl2 at is ________ atm.

The enzyme ________ converts nitrogen into ammonia.

Of the following,________ will lower the activation energy for a reaction.

Fe and Mo are transition metals found in the cofactor active site of ________.

The reaction CH3-N≡C → CH3-C≡N Is a first-order reaction.At If is 1.00 × 10-3 initially, is ________ M after

A compound decomposes by a first-order process.If 13% of the compound decomposes in 60 minutes,the half-life of the compound is ________ min.

At elevated temperatures,dinitrogen pentoxide decomposes to nitrogen dioxide and oxygen: 2N2O5(g)→ 4NO2 (g)+ O2 (g) When the rate of formation of NO2 is 5.5 × 10-4 M/s,the rate of decomposition of N2O5 is ________ M/s.

What is the magnitude of k for a first-order reaction at 75.0 °C if and rate constant is 1.35 × at 25.0 °C?

For the elementary reaction NO3 + CO → NO2 + CO2 The molecularity of the reaction is ________,and the rate law is

Which of the following is correct regarding the overall order of the reaction?

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.

The average rate of disappearance of A between 10 s and 20 s is ________ mol/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

The elementary reaction 2NO₂ (g)→ 2NO (g)+ O₂ (g) Is second order in and the rate constant at 660 K is 5.23 .The reaction half-life at this temperature when = 0.45 M is ________ s.

A second-order reaction has a half-life of 12 s when the initial concentration of reactant is 0.98 M.The rate constant for this reaction is ________ M^-1s^-1.

The rate constant of a first-order process that has a half-life of 3.50 min is ________ s^-1.

decomposes in the gas phase by the reaction SO₂Cl₂ (g)→ SO₂ (g)+ Cl₂ (g) The reaction is first order in SO₂Cl₂ and the rate constant is 3.0 × at 600 K.A vessel is charged with 3.6 atm of SO₂Cl₂ at 600 K.The partial pressure of SO₂Cl₂ at is ________ atm.

The reaction CH₃-N≡C → CH₃-C≡N Is a first-order reaction.At If is 1.00 × 10^-3 initially, is ________ M after

At elevated temperatures,dinitrogen pentoxide decomposes to nitrogen dioxide and oxygen: 2N₂O₅(g)→ 4NO₂(g)+ O₂ (g) When the rate of formation of NO₂ is 5.5 × 10^-4 M/s,the rate of decomposition of N₂O₅ is ________ M/s.

For the elementary reaction NO₃ + CO → NO₂ + CO₂ The molecularity of the reaction is ________,and the rate law is

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.