Question 1

Concerning the rate law, Rate = k[A]2[B], what are appropriate units for the rate constant k?

Accepted Answer

A)  s-1
B)  M-1s-1
C)  M-2s-1
D)  M/s
E)  M2/sF) C) and D)
G) A) and C)

Question 2

The rate law for the reaction 2NO2 + O3  →\rarr→ N2O5 + O2 is rate = k[NO2][O3].Which one of the following mechanisms is consistent with this rate law?

Accepted Answer

A)  NO2 + NO2  →\rarr→  N2O4 (fast)  N2O4 + O3  →\rarr→  N2O5 + O2 (slow) 
B)  NO2 + O3  →\rarr→  NO5 (fast)  NO5 + NO5  →\rarr→ N2O5 + 5/2O2 (slow) 
C)  NO2 + O3  →\rarr→  NO3 + O2 (slow)  NO3 + NO2  →\rarr→  N2O5 (fast) 
D)  NO2 + NO2  →\rarr→ N2O2 + O2 (slow)  N2O2 + O3 →\rarr→  N2O5 (fast)  E) B) and C)
F) C) and D)

Question 3

At 25°C, by what factor is the reaction rate increased by a catalyst that reduces the activation energy of the reaction by 1.00 kJ/mol?

Accepted Answer

A)  1.63
B)  123
C)  1.04
D)  1.50
E)  2.53F) A) and E)
G) B) and E)

Question 4

The following mechanism has been suggested for the reaction:

H2O2 + 2H+ + 2I -  →\rarr→  I2 + 2H2O

2O2 + 2H+ + 2I -  \rarr  I2 + 2H2O      Identify the molecularity of the rate determining step A) unimolecular B) bimolecular C) termolecular D) unimolecular and bimolecular E) bimolecular and termolecular " class="answers-bank-image d-inline" rel="preload" >
 Identify the molecularity of the rate determining step

Accepted Answer

A)  unimolecular
B)  bimolecular
C)  termolecular
D)  unimolecular and bimolecular
E)  bimolecular and termolecular F) A) and D)
G) C) and E)

Question 5

For the reaction A + 3B  →\rarr→  2C, the rate of disappearance of B given by ( Δ\DeltaΔ [B]/ Δ\DeltaΔ t) may also be expressed as

Accepted Answer

A)  ( Δ\DeltaΔ [B]/ Δ\DeltaΔ t = - (1/3)  Δ\DeltaΔ [A]/ Δ\DeltaΔ t) 
B)  ( Δ\DeltaΔ [B]/ Δ\DeltaΔ t = - 3 Δ\DeltaΔ [A]/ Δ\DeltaΔ t) 
C)  ( Δ\DeltaΔ [B]/ Δ\DeltaΔ t = 3  Δ\DeltaΔ [A]/ Δ\DeltaΔ t) 
D)  ( Δ\DeltaΔ [B]/ Δ\DeltaΔ t = (1/3)  Δ\DeltaΔ [A]/ Δ\DeltaΔ t) 
E)  ( Δ\DeltaΔ [B]/ Δ\DeltaΔ t = - Δ\DeltaΔ [A]/ Δ\DeltaΔ t)  F) A) and D)
G) A) and C)

Question 6

Appropriate units for a first-order rate constant are

Accepted Answer

A)  M/s
B)  1/M·s
C)  1/s
D)  1/M2·sE) A) and C)
F) A) and B)

Question 7

A city's water supply is contaminated with a toxin at a concentration of 0.63 mg/L.For the water to be safe for drinking, the concentration of this toxin must be below 1.5 x 10-3 mg/L.Fortunately, this toxin decomposes to a safe mixture of products by first-order kinetics with a rate constant of 0.27 day-1.How long will it take for the water to be safe to drink?

Accepted Answer

A)  2.2 days
B)  2.6 days
C)  20.days
D)  22 days
E)  27 daysF) D) and E)
G) A) and E)

Question 8

Use the following data to determine the rate law for the reaction shown below. 2NO + H2  →\rarr→ N2O + H2O 2  \rarr N2O + H2O   A) rate = k[NO] B) rate = k[NO]2 C) rate = k[NO][H2] D) rate = k[NO]2[H2] E) rate = k[NO]2[H2]2 " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  rate = k[NO]
B)  rate = k[NO]2
C)  rate = k[NO][H2]
D)  rate = k[NO]2[H2]
E)  rate = k[NO]2[H2]2 F) A) and B)
G) A) and C)

Question 9

The activation energy for the following reaction is 60.kJ/mol. 
Sn2+ + 2Co3+  →\rarr→ Sn4+ + 2Co2+
 By what factor (how many times) will the rate constant increase when the temperature is raised from 10°C to 28°C?

Accepted Answer

A)  1.002
B)  4.6
C)  5.6
D)  2.8
E)  696 F) A) and B)
G) B) and E)

Question 10

Nitric acid is formed by the gas-phase hydrolysis of N2O5.For the reaction N2O5 + H2O $\rarr$ 2HNO3, Ea(forward)= 15 kJ/mol and Ea(reverse)= 51 kJ/mol.Calculate $\Delta$Hrxn.

Accepted Answer

Question 11

Complete the following statement: A catalyst

Accepted Answer

A)  increases the activation energy.
B)  alters the reaction mechanism.
C)  increases the average kinetic energy of the reactants.
D)  increases the concentration of reactants.
E)  increases the collision frequency of reactant molecules.F) A) and B)
G) A) and C)

Question 12

What is the slope of an Arrhenius plot for the following reaction? 
2NOCl  →\rarr→ 2NO + Cl2

2     A) 8.18 × 10-2 K B) 5.06 × 10-2 K C) -1.22 × 104 K D) -1.96 × 104 K E) not enough information to calculate the slope " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  8.18 × 10-2 K
B)  5.06 × 10-2 K
C)  -1.22 × 104 K
D)  -1.96 × 104 K
E)  not enough information to calculate the slope F) A) and D)
G) B) and D)

Question 13

Ammonium ion (NH4+) reacts with nitrite ion (NO2-) to yield nitrogen gas and liquid water.The following initial rates of reaction have been measured for the given reactant concentrations. 4+) reacts with nitrite ion (NO2-) to yield nitrogen gas and liquid water.The following initial rates of reaction have been measured for the given reactant concentrations.   Which of the following is the rate law (rate equation) for this reaction? A) rate = k [NH4+] [NO2-]4 B) rate = k [NH4+] [NO2-] C) rate = k [NH4+] [NO2-]2 D) rate = k [NH4+]2 [NO2-] E) rate = k [NH4+]1/2 [NO2-]1/4" class="answers-bank-image d-inline" rel="preload" > Which of the following is the rate law (rate equation) for this reaction?

Accepted Answer

A)  rate = k [NH4+] [NO2-]4
B)  rate = k [NH4+] [NO2-]
C)  rate = k [NH4+] [NO2-]2
D)  rate = k [NH4+]2 [NO2-]
E)  rate = k [NH4+]1/2 [NO2-]1/4F) A) and E)
G) B) and D)

Question 14

The rate constant for a certain first-order reaction is 0.40/min.What is the initial rate in mole/L·min, if the initial concentration of the compound involved is 0.50 mol/L?

Accepted Answer

The answer of The rate constant for a certain first-order...

Question 15

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

Accepted Answer

A)  2.5 × 10-2 atm/s
B)  -6.2 × 10-3 atm/s
C)  -2.5 × 10-2 atm/s
D)  0.10 atm/s
E)  6.2 × 10-3 atm/s F) None of the above
G) A) and B)

Question 16

The following mechanism has been suggested for the reaction: 
H2O2 + 2H+ + 2I -  →\rarr→  I2 + 2H2O

2O2 + 2H+ + 2I -  \rarr  I2 + 2H2O       Identify all intermediates included in this mechanism.  A) H+ and I - B) H+ and HOI C) HOI and OH- D) H+ only E) H2O and OH- " class="answers-bank-image d-inline" rel="preload" >

Identify all intermediates included in this mechanism.

Accepted Answer

A)  H+ and I -
B)  H+ and HOI
C)  HOI and OH-
D)  H+ only
E)  H2O and OH- F) A) and B)
G) A) and C)

Question 17

For the reaction whose rate law is rate = k[X], a plot of which of the following is a straight line?

Accepted Answer

A)  [X] versus time
B)  ln [X] versus time
C)  1/[X] versus time
D)  [X] versus 1/time
E)  ln [X] versus 1/timeF) D) and E)
G) C) and D)

Question 18

The thermal decomposition of acetaldehyde, CH3CHO  →\rarr→ CH4 + CO, is a second-order reaction.The following data were obtained at 518°C.

3CHO  \rarr CH4 + CO, is a second-order reaction.The following data were obtained at 518°C.       Based on the data given, what is the half-life for the disappearance of acetaldehyde? A) 1.5 × 105 s B) 410 s C) 5.4 × 107 s D) 520 s E) 305 s " class="answers-bank-image d-inline" rel="preload" >

Based on the data given, what is the half-life for the disappearance of acetaldehyde?

Accepted Answer

A)  1.5 × 105 s
B)  410 s
C)  5.4 × 107 s
D)  520 s
E)  305 s F) D) and E)
G) C) and D)

Question 19

If Ea for a certain biological reaction is 50.kJ/mol, by what factor (how many times) will the rate of this reaction increase when body temperature increases from 37°C (normal) to 40°C (fever) ?

Accepted Answer

A)  1.15
B)  1.20
C)  2.0 × 105
D)  1.0002
E)  2.0F) B) and E)
G) None of the above

Question 20

Chlorine dioxide reacts in basic water to form chlorite and chlorate according to the following chemical equation: 2ClO2(aq) + 2OH-(aq)   →\rarr→ ClO2-(aq) + ClO3-(aq) + H2O(l) 
Under a certain set of conditions, the initial rate of disappearance of chlorine dioxide was determined to be 2.30 x 10-1 M/s.What is the initial rate of appearance of chlorite ion under those same conditions?

Accepted Answer

A)  5.75 x 10-2 M/s
B)  1.15 x 10-1 M/s
C)  2.30 x 10-1 M/s
D)  4.60 x 10-1 M/s
E)  9.20 x 10-1 M/s F) B) and E)
G) A) and B)

Exam 13: Chemical Kinetics

Correct Answer
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At 25°C, by what factor is the reaction rate increased by a catalyst that reduces the activation energy of the reaction by 1.00 kJ/mol?

Correct Answer
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Correct Answer
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The activation energy for the following reaction is 60.kJ/mol. Sn²⁺ + 2Co³⁺ $\rarr$ Sn⁴⁺ + 2Co²⁺ By what factor (how many times) will the rate constant increase when the temperature is raised from 10°C to 28°C?

Correct Answer
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The rate constant for a certain first-order reaction is 0.40/min.What is the initial rate in mole/L·min, if the initial concentration of the compound involved is 0.50 mol/L?

Correct Answer
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Correct Answer
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Concerning the rate law, Rate = k[A]²[B], what are appropriate units for the rate constant k?

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

Correct Answer
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Nitric acid is formed by the gas-phase hydrolysis of N₂O₅.For the reaction N₂O₅ + H₂O $\rarr$ 2HNO₃, E_a(forward)= 15 kJ/mol and E_a(reverse)= 51 kJ/mol.Calculate $\Delta$ H_rxn.

Correct Answer
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The rate law for the reaction 2NO₂ + O₃ $\rarr$ N₂O₅ + O₂ is rate = k[NO₂][O₃].Which one of the following mechanisms is consistent with this rate law?

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Complete the following statement: A catalyst

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For the reaction A + 3B $\rarr$ 2C, the rate of disappearance of B given by ( $\Delta$ [B]/ $\Delta$ t) may also be expressed as

Correct Answer
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If E_a for a certain biological reaction is 50.kJ/mol, by what factor (how many times) will the rate of this reaction increase when body temperature increases from 37°C (normal) to 40°C (fever) ?

Correct Answer
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For the reaction whose rate law is rate = k[X], a plot of which of the following is a straight line?

Correct Answer
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Ammonium ion (NH₄⁺) reacts with nitrite ion (NO₂^-) to yield nitrogen gas and liquid water.The following initial rates of reaction have been measured for the given reactant concentrations. Which of the following is the rate law (rate equation) for this reaction?

Correct Answer
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Appropriate units for a first-order rate constant are

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Exam 13: Chemical Kinetics

The following mechanism has been suggested for the reaction: H2O2 + 2H+ + 2I - →\rarr→ I2 + 2H2O Identify all intermediates included in this mechanism.

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At 25°C, by what factor is the reaction rate increased by a catalyst that reduces the activation energy of the reaction by 1.00 kJ/mol?

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The thermal decomposition of acetaldehyde, CH3CHO →\rarr→ CH4 + CO, is a second-order reaction.The following data were obtained at 518°C. Based on the data given, what is the half-life for the disappearance of acetaldehyde?

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The activation energy for the following reaction is 60.kJ/mol. Sn2+ + 2Co3+ →\rarr→ Sn4+ + 2Co2+ By what factor (how many times) will the rate constant increase when the temperature is raised from 10°C to 28°C?

Correct AnswerverifiedShow Answer

The rate constant for a certain first-order reaction is 0.40/min.What is the initial rate in mole/L·min, if the initial concentration of the compound involved is 0.50 mol/L?

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Use the following data to determine the rate law for the reaction shown below. 2NO + H2 →\rarr→ N2O + H2O

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What is the slope of an Arrhenius plot for the following reaction? 2NOCl →\rarr→ 2NO + Cl2

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Concerning the rate law, Rate = k[A]2[B], what are appropriate units for the rate constant k?

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

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Nitric acid is formed by the gas-phase hydrolysis of N2O5.For the reaction N2O5 + H2O →\rarr→ 2HNO3, Ea(forward)= 15 kJ/mol and Ea(reverse)= 51 kJ/mol.Calculate Δ\DeltaΔ Hrxn.

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The rate law for the reaction 2NO2 + O3 →\rarr→ N2O5 + O2 is rate = k[NO2][O3].Which one of the following mechanisms is consistent with this rate law?

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The following mechanism has been suggested for the reaction: H2O2 + 2H+ + 2I - →\rarr→ I2 + 2H2O Identify the molecularity of the rate determining step

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Complete the following statement: A catalyst

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For the reaction A + 3B →\rarr→ 2C, the rate of disappearance of B given by ( Δ\DeltaΔ [B]/ Δ\DeltaΔ t) may also be expressed as

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If Ea for a certain biological reaction is 50.kJ/mol, by what factor (how many times) will the rate of this reaction increase when body temperature increases from 37°C (normal) to 40°C (fever) ?

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Correct AnswerverifiedShow Answer

For the reaction whose rate law is rate = k[X], a plot of which of the following is a straight line?

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Ammonium ion (NH4+) reacts with nitrite ion (NO2-) to yield nitrogen gas and liquid water.The following initial rates of reaction have been measured for the given reactant concentrations. Which of the following is the rate law (rate equation) for this reaction?

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Appropriate units for a first-order rate constant are

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Correct Answer
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The activation energy for the following reaction is 60.kJ/mol. Sn²⁺ + 2Co³⁺ $\rarr$ Sn⁴⁺ + 2Co²⁺ By what factor (how many times) will the rate constant increase when the temperature is raised from 10°C to 28°C?

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Correct Answer
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Concerning the rate law, Rate = k[A]²[B], what are appropriate units for the rate constant k?

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

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Nitric acid is formed by the gas-phase hydrolysis of N₂O₅.For the reaction N₂O₅ + H₂O $\rarr$ 2HNO₃, E_a(forward)= 15 kJ/mol and E_a(reverse)= 51 kJ/mol.Calculate $\Delta$ H_rxn.

Correct Answer
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The rate law for the reaction 2NO₂ + O₃ $\rarr$ N₂O₅ + O₂ is rate = k[NO₂][O₃].Which one of the following mechanisms is consistent with this rate law?

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For the reaction A + 3B $\rarr$ 2C, the rate of disappearance of B given by ( $\Delta$ [B]/ $\Delta$ t) may also be expressed as

Correct Answer
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If E_a for a certain biological reaction is 50.kJ/mol, by what factor (how many times) will the rate of this reaction increase when body temperature increases from 37°C (normal) to 40°C (fever) ?

Correct Answer
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Correct Answer
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Ammonium ion (NH₄⁺) reacts with nitrite ion (NO₂^-) to yield nitrogen gas and liquid water.The following initial rates of reaction have been measured for the given reactant concentrations. Which of the following is the rate law (rate equation) for this reaction?

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Correct Answer
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