Question 1

For a first-order reaction, a plot of ________ versus ________ is linear.
A)ln [A]t,   
B)ln [A]t, t
C)   , t 
D)[A]t, t
E)t,

Accepted Answer

Question 2

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 3

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 4

A flask is charged with 0.124 mol of A and allowed to react to form B according to the reaction A(g)→B(g). The following data are obtained for [A] as the reaction proceeds:  
-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

Question 5

The concentration of S2O82- remaining at 400 s is ________ M.

Accepted Answer

A) +0.015 
B) +0.035 
C) -0.007 
D) +0.045 
E) +0.057 
A) +0.015 
B) +0.035 
C) -0.007 
D) +0.045 
E) +0.057

Question 6

The rate constant for a particular zero-order reaction is 0.075 M s-1. If the initial concentration of reactant is 0.537 M it takes ________ s for the concentration to decrease to 0.100 M.

Accepted Answer

A) 5.8 
B) -5.8 
C) -0.047 
D) 7.2 
E) 0.040 
A) 5.8 
B) -5.8 
C) -0.047 
D) 7.2 
E) 0.040

Question 7

The data in the table below were obtained for the reaction:
A + B → P  
-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 8

Consider the following reaction: 3A → 2B
The average rate of appearance of B is given by Δ[B]/Δt. Comparing the rate of appearance of B and the rate of disappearance of A, we get Δ[B]/Δt = ________ × (-Δ[A]/Δt).

Accepted Answer

A) -2/3 
B) +2/3 
C) -3/2 
D) +1 
E) +3/2 
A) -2/3 
B) +2/3 
C) -3/2 
D) +1 
E) +3/2

Question 9

The reaction A (aq) → B (aq)is first order in [A]. A solution is prepared with [A] = 1.22 M. The following data are obtained as the reaction proceeds:   The rate constant for this reaction is ________ s-1.

Accepted Answer

A) 0.23 
B) 1.0 
C) 0.17 
D) 0.12 
E) -0.12 
A) 0.23 
B) 1.0 
C) 0.17 
D) 0.12 
E) -0.12

Question 10

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 11

Which one of the following is not a valid expression for the rate of the reaction below? 4NH3 + 7O2 → 4NO2 + 6H2O

Accepted Answer

A) -     
B)      
C)      
D) -     
E) All of the above are valid expressions of the reaction rate. 
A) -     
B)      
C)      
D) -     
E) All of the above are valid expressions of the reaction rate.

Question 12

The half-life of a first-order reaction is 13 min. If the initial concentration of reactant is 0.085 M, it takes ________ min for it to decrease to 0.055 M.

Accepted Answer

A) 8.2 
B) 11 
C) 3.6 
D) 0.048 
E) 8.4 
A) 8.2 
B) 11 
C) 3.6 
D) 0.048 
E) 8.4

Question 13

The elementary reaction 2NO2 (g) → 2NO (g) + O2 (g)
Is second order in NO2 and the rate constant at 660 K is 5.23 M-1s-1. The reaction half-life at this temperature when [NO2]0 = 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

Question 14

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 15

The data in the table below were obtained for the reaction:
2 ClOS1U1B12S1U1B0 (aq) + 2 OHS1U1P1-S1S1P0 (aq) → ClOS1U1B13S1U1B0S1U1P1-S1S1P0 (aq) + ClOS1U1B12S1U1B0S1U1P1-S1S1P0 (aq) + HS1U1B12S1U1B0O (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 16

The combustion of ethylene proceeds by the reaction C2H4 (g) + 3O2 (g) → 2CO2 (g) + 2H2O (g)
When the rate of disappearance of O2 is 0.13 M s-1, the rate of appearance of CO2 is ________ M s-1.

Accepted Answer

A) 0.087 
B) 0.043 
C) 0.39 
D) 0.20 
E) 0.26 
A) 0.087 
B) 0.043 
C) 0.39 
D) 0.20 
E) 0.26

Question 17

________ 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 18

The isomerization of methylisonitrile to acetonitrile CH3NC (g) → CH3CN (g)
Is first order in CH3NC. The half-life of the reaction is 2.70 × 104 s at 463 K. The rate constant when the initial [CH3NC] is 0.030 M is ________ s-1.

Accepted Answer

A) 3.90 × 104 
B) 1.23 × 10-3 
C) 2.57 × 10-5 
D) 8.10 × 102 
E) 1.25 × 107 
A) 3.90 × 104 
B) 1.23 × 10-3 
C) 2.57 × 10-5 
D) 8.10 × 102 
E) 1.25 × 107

Question 19

The half-life of a first-order reaction is 13 min. If the initial concentration of reactant is 0.13 M, it takes ________ min 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

Question 20

The peroxydisulfate ion (SS1U1B12S1U1B0OS1U1B18S1U1B0S1U1P12-S1S1P0)reacts with the iodide ion in aqueous solution via the reaction:
SS1U1B12S1U1B0OS1U1B18S1U1B0S1U1P12-S1S1P0 (aq) + 3IS1U1P1-S1S1P0 → 2SOS1U1B14S1U1B0 (aq)+ IS1U1B13S1U1B0S1U1P1-S1S1P0 (aq)
An aqueous solution containing 0.050 M of SS1U1B12S1U1B0OS1U1B18S1U1B0S1U1P12-S1S1P0 ion and 0.072 M of IS1U1P1-S1S1P0 is prepared, and the progress of the reaction followed by measuring [IS1U1P1-S1S1P0]. The data obtained is given in the table below.  
-The average rate of disappearance of I- between 1200.0 s and 1600.0 s is ________ M/s.

Accepted Answer

A) 1.8 × 10-5 
B) 1.2 × 10-5 
C) 2.0 × 10-5 
D) 5.0 × 104 
E) 1.6 × 10-4 
A) 1.8 × 10-5 
B) 1.2 × 10-5 
C) 2.0 × 10-5 
D) 5.0 × 104 
E) 1.6 × 10-4

Exam 14: Chemical Kinetics

For a first-order reaction, a plot of ________ versus ________ is linear. A)ln [A]t, B)ln [A]t, t C) , t D)[A]t, t E)t,

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.

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

A flask is charged with 0.124 mol of A and allowed to react to form B according to the reaction A(g)→B(g). The following data are obtained for [A] as the reaction proceeds: -How many moles of B are present at 10 s?

The concentration of S2O82- remaining at 400 s is ________ M.

The rate constant for a particular zero-order reaction is 0.075 M s-1. If the initial concentration of reactant is 0.537 M it takes ________ s for the concentration to decrease to 0.100 M.

The data in the table below were obtained for the reaction: A + B → P -The order of the reaction in A is ________.

Consider the following reaction: 3A → 2B The average rate of appearance of B is given by Δ[B]/Δt. Comparing the rate of appearance of B and the rate of disappearance of A, we get Δ[B]/Δt = ________ × (-Δ[A]/Δt).

The reaction A (aq) → B (aq)is first order in [A]. A solution is prepared with [A] = 1.22 M. The following data are obtained as the reaction proceeds: The rate constant for this reaction is ________ s-1.

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 ________.

Which one of the following is not a valid expression for the rate of the reaction below? 4NH3 + 7O2 → 4NO2 + 6H2O

The half-life of a first-order reaction is 13 min. If the initial concentration of reactant is 0.085 M, it takes ________ min for it to decrease to 0.055 M.

The elementary reaction 2NO2 (g) → 2NO (g) + O2 (g) Is second order in NO2 and the rate constant at 660 K is 5.23 M-1s-1. The reaction half-life at this temperature when [NO2]0 = 0.45 M is ________ s.

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.

The data in the table below were obtained for the reaction: 2 ClO2 (aq) + 2 OH- (aq) → ClO3- (aq) + ClO2- (aq) + H2O (1) -What is the overall order of the reaction?

The combustion of ethylene proceeds by the reaction C2H4 (g) + 3O2 (g) → 2CO2 (g) + 2H2O (g) When the rate of disappearance of O2 is 0.13 M s-1, the rate of appearance of CO2 is ________ M s-1.

________ are used in automotive catalytic converters.

The isomerization of methylisonitrile to acetonitrile CH3NC (g) → CH3CN (g) Is first order in CH3NC. The half-life of the reaction is 2.70 × 104 s at 463 K. The rate constant when the initial [CH3NC] is 0.030 M is ________ s-1.

The half-life of a first-order reaction is 13 min. If the initial concentration of reactant is 0.13 M, it takes ________ min for it to decrease to 0.085 M.

Introduction: Matter and Measurement

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For a first-order reaction, a plot of versus is linear. A)ln [A]_t, B)ln [A]_t, t C) , t D)[A]_t, t E)t,

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 concentration of S₂O₈^2- remaining at 400 s is ________ M.

The rate constant for a particular zero-order reaction is 0.075 M s^-1. If the initial concentration of reactant is 0.537 M it takes ________ s for the concentration to decrease to 0.100 M.

The reaction A (aq) → B (aq)is first order in [A]. A solution is prepared with [A] = 1.22 M. The following data are obtained as the reaction proceeds: The rate constant for this reaction is ________ s^-1.

Which one of the following is not a valid expression for the rate of the reaction below? 4NH₃ + 7O₂ → 4NO₂ + 6H₂O

The elementary reaction 2NO₂ (g) → 2NO (g) + O₂ (g) Is second order in NO₂ and the rate constant at 660 K is 5.23 M^-1s^-1. The reaction half-life at this temperature when [NO₂]₀ = 0.45 M is ________ s.

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.

The data in the table below were obtained for the reaction: 2 ClO₂ (aq) + 2 OH^- (aq) → ClO₃^- (aq) + ClO₂^- (aq) + H₂O (1) -What is the overall order of the reaction?

The combustion of ethylene proceeds by the reaction C₂H₄ (g) + 3O₂ (g) → 2CO₂ (g) + 2H₂O (g) When the rate of disappearance of O₂ is 0.13 M s^-1, the rate of appearance of CO₂ is ________ M s^-1.

The isomerization of methylisonitrile to acetonitrile CH₃NC (g) → CH₃CN (g) Is first order in CH₃NC. The half-life of the reaction is 2.70 × 10⁴ s at 463 K. The rate constant when the initial [CH₃NC] is 0.030 M is ________ s^-1.