A possible mechanism for the overall reaction Br2 (g)+ 2NO (g)→ 2NOBr (g) Is NO (g)+ Br2 (g) NOBr2 (g)(fast) NOBr2 (g)+ NO (g) 2NOBr (slow) The rate law for formation of NOBr based on this mechanism is rate = __________.

A) k1[NO]1/2 B) k1[Br2]1/2 C) (k2k1/k-1)[NO]2[Br2] D) (k1/k-1)2[NO]2 E) (k2k1/k-1)[NO]2[Br2]2 A) k1[NO]1/2 B) k1[Br2]1/2 C) (k2k1/k-1)[NO]2[Br2] D) (k1/k-1)2[NO]2 E) (k2k1/k-1)[NO]2[Br2]2 C

The reaction below is first order in [H2O2]: 2H2O2 (l)→ 2H2O (l)+ O2 (g) A solution originally at 0.600 M H2O2 is found to be 0.075 M after 54 min. The half-life for this reaction is __________ min.

A) 6.8 B) 18 C) 14 D) 28 E) 54 A) 6.8 B) 18 C) 14 D) 28 E) 54

The isomerization of methylisonitrile to acetonitrile CH3NC (g)→ CH3CN (g) Is first order in CH3NC. The rate constant for the reaction is 9.45 × 10-5s-1 at 478 K. The half-life of the reaction when the initial [CH3NC] is 0.030 M is __________ s.

A) 1.06 × 104 B) 5.29 × 103 C) 3.53E × 105 D) 7.33 × 103 E) 1.36 × 10-4 A) 1.06 × 104 B) 5.29 × 103 C) 3.53E × 105 D) 7.33 × 103 E) 1.36 × 10-4

The rate of disappearance of HBr in the gas phase reaction 2HBr (g)→ H2 (g)+ Br2 (g) Is 0.130 Ms-1 at 150°C. The rate of reaction is __________ Ms-1.

A) 3.85 B) 0.0650 C) 0.0169 D) 0.260 E) 0.0860 A) 3.85 B) 0.0650 C) 0.0169 D) 0.260 E) 0.0860

The elementary reaction 2NO2 (g)→ 2NO (g)+ O2 (g) Is second order in NO2 and the rate constant at 501 K is 7.93 × 10-3M-1s-1. The reaction half-life at this temperature when [NO2]0= 0.45 M is __________ s.

A) 3.6 × 10-3 B) 0.011 C) 126 D) 87 E) 280 A) 3.6 × 10-3 B) 0.011 C) 126 D) 87 E) 280

Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO2 → 2NO + O2 In a particular experiment at 300 °C, [NO2] drops from 0.0100 to 0.00650 M in 100 s. The rate of disappearance of NO2 for this period is __________ M/s.

A) 0.35 B) 3.5 × 10-3 C) 3.5 × 10-5 D) 7.0 × 10-3 E) 1.8 × 10-3 A) 0.35 B) 3.5 × 10-3 C) 3.5 × 10-5 D) 7.0 × 10-3 E) 1.8 × 10-3

Exam 14: Chemical Kinetics

At elevated temperatures, methylisonitrile (CH₃NC)isomerizes to acetonitrile (CH₃CN): CH₃NC (g)→ CH₃CN (g) The reaction is first order in methylisonitrile. The attached graph shows data for the reaction obtained at 198.9°C. The rate constant for the reaction is __________ s^-1.

Free

(Multiple Choice)

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Question 1

Correct Answer:

Verified

A possible mechanism for the overall reaction Br₂ (g)+ 2NO (g)→ 2NOBr (g) Is NO (g)+ Br₂ (g) NOBr₂ (g)(fast) NOBr₂ (g)+ NO (g) 2NOBr (slow) The rate law for formation of NOBr based on this mechanism is rate = __________.

Free

(Multiple Choice)

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Question 2

Correct Answer:

Verified

A catalyst that is present in the same phase as the reacting molecules is called a __________ catalyst.

Free

(Short Answer)

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Question 3

Correct Answer:

Verified

homogeneous

The half-life of this reaction is __________ s.

(Multiple Choice)

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Question 4

Under constant conditions, the half-life of a first-order reaction __________.

(Multiple Choice)

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Question 5

The reaction below is first order in [H₂O₂]: 2H₂O₂ (l)→ 2H₂O (l)+ O₂ (g) A solution originally at 0.600 M H₂O₂ is found to be 0.075 M after 54 min. The half-life for this reaction is __________ min.

(Multiple Choice)

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Question 6

If a rate law is second order (reactant), doubling the reactant __________ the reaction rate.

(Short Answer)

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Question 7

The average rate of disappearance of I^- between 1200.0 s and 1600.0 s is __________ M/s.

(Multiple Choice)

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Question 8

The isomerization of methylisonitrile to acetonitrile CH₃NC (g)→ CH₃CN (g) Is first order in CH₃NC. The rate constant for the reaction is 9.45 × 10^-5s^-1 at 478 K. The half-life of the reaction when the initial [CH₃NC] is 0.030 M is __________ s.

(Multiple Choice)

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Question 9

The enzyme nitrogenase converts into .

(Multiple Choice)

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Question 10

What is the magnitude of the rate constant for the reaction?

(Multiple Choice)

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Question 11

The rate constant for a particular second-order reaction is 0.47M^-1s^-1. If the initial concentration of reactant is 0.25 mol/L, it takes __________ s for the concentration to decrease to 0.080 mol/L.

(Multiple Choice)

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Question 12

The rate of disappearance of HBr in the gas phase reaction 2HBr (g)→ H₂ (g)+ Br₂ (g) Is 0.130 Ms^-1 at 150°C. The rate of reaction is __________ Ms^-1.

(Multiple Choice)

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Question 13

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

(Multiple Choice)

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Question 14

Which of the following is true?

(Multiple Choice)

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Question 15

The average rate disappearance of A between 20 s and 30 s is __________ mol/s.

(Multiple Choice)

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Question 16

The elementary reaction 2NO₂(g)→ 2NO (g)+ O₂ (g) Is second order in NO₂ and the rate constant at 501 K is 7.93 × 10^-³M^-1s^-1. The reaction half-life at this temperature when [NO₂]0= 0.45 M is __________ s.

(Multiple Choice)

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Question 17

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

(Multiple Choice)

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Question 18

Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO₂ → 2NO + O₂ In a particular experiment at 300 °C, [NO₂] drops from 0.0100 to 0.00650 M in 100 s. The rate of disappearance of NO₂ for this period is __________ M/s.

(Multiple Choice)

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Question 19

Which substance in the reaction below either appears or disappears the fastest? 4NH₃ + 7O₂ → 4NO₂ + 6H₂O

(Multiple Choice)

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Question 20

Showing 1 - 20 of 130

Exam 14: Chemical Kinetics

At elevated temperatures, methylisonitrile (CH3NC)isomerizes to acetonitrile (CH3CN): CH3NC (g)→ CH3CN (g) The reaction is first order in methylisonitrile. The attached graph shows data for the reaction obtained at 198.9°C. The rate constant for the reaction is __________ s-1.

A possible mechanism for the overall reaction Br2 (g)+ 2NO (g)→ 2NOBr (g) Is NO (g)+ Br2 (g) NOBr2 (g)(fast) NOBr2 (g)+ NO (g) 2NOBr (slow) The rate law for formation of NOBr based on this mechanism is rate = __________.

A catalyst that is present in the same phase as the reacting molecules is called a __________ catalyst.

The half-life of this reaction is __________ s.

Under constant conditions, the half-life of a first-order reaction __________.

The reaction below is first order in [H2O2]: 2H2O2 (l)→ 2H2O (l)+ O2 (g) A solution originally at 0.600 M H2O2 is found to be 0.075 M after 54 min. The half-life for this reaction is __________ min.

If a rate law is second order (reactant), doubling the reactant __________ the reaction rate.

The average rate of disappearance of I- between 1200.0 s and 1600.0 s is __________ M/s.

The isomerization of methylisonitrile to acetonitrile CH3NC (g)→ CH3CN (g) Is first order in CH3NC. The rate constant for the reaction is 9.45 × 10-5s-1 at 478 K. The half-life of the reaction when the initial [CH3NC] is 0.030 M is __________ s.

The enzyme nitrogenase converts __________ into __________.

What is the magnitude of the rate constant for the reaction?

The rate constant for a particular second-order reaction is 0.47M-1s-1. If the initial concentration of reactant is 0.25 mol/L, it takes __________ s for the concentration to decrease to 0.080 mol/L.

The rate of disappearance of HBr in the gas phase reaction 2HBr (g)→ H2 (g)+ Br2 (g) Is 0.130 Ms-1 at 150°C. The rate of reaction is __________ Ms-1.

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

Which of the following is true?

The average rate disappearance of A between 20 s and 30 s is __________ mol/s.

The elementary reaction 2NO2 (g)→ 2NO (g)+ O2 (g) Is second order in NO2 and the rate constant at 501 K is 7.93 × 10-3M-1s-1. The reaction half-life at this temperature when [NO2]0= 0.45 M is __________ s.

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

Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO2 → 2NO + O2 In a particular experiment at 300 °C, [NO2] drops from 0.0100 to 0.00650 M in 100 s. The rate of disappearance of NO2 for this period is __________ M/s.

Which substance in the reaction below either appears or disappears the fastest? 4NH3 + 7O2 → 4NO2 + 6H2O

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At elevated temperatures, methylisonitrile (CH₃NC)isomerizes to acetonitrile (CH₃CN): CH₃NC (g)→ CH₃CN (g) The reaction is first order in methylisonitrile. The attached graph shows data for the reaction obtained at 198.9°C. The rate constant for the reaction is __________ s^-1.

A possible mechanism for the overall reaction Br₂ (g)+ 2NO (g)→ 2NOBr (g) Is NO (g)+ Br₂ (g) NOBr₂ (g)(fast) NOBr₂ (g)+ NO (g) 2NOBr (slow) The rate law for formation of NOBr based on this mechanism is rate = __________.

The reaction below is first order in [H₂O₂]: 2H₂O₂ (l)→ 2H₂O (l)+ O₂ (g) A solution originally at 0.600 M H₂O₂ is found to be 0.075 M after 54 min. The half-life for this reaction is __________ min.

The average rate of disappearance of I^- between 1200.0 s and 1600.0 s is __________ M/s.

The isomerization of methylisonitrile to acetonitrile CH₃NC (g)→ CH₃CN (g) Is first order in CH₃NC. The rate constant for the reaction is 9.45 × 10^-5s^-1 at 478 K. The half-life of the reaction when the initial [CH₃NC] is 0.030 M is __________ s.

The enzyme nitrogenase converts into .

The rate constant for a particular second-order reaction is 0.47M^-1s^-1. If the initial concentration of reactant is 0.25 mol/L, it takes __________ s for the concentration to decrease to 0.080 mol/L.

The rate of disappearance of HBr in the gas phase reaction 2HBr (g)→ H₂ (g)+ Br₂ (g) Is 0.130 Ms^-1 at 150°C. The rate of reaction is __________ Ms^-1.

The elementary reaction 2NO₂(g)→ 2NO (g)+ O₂ (g) Is second order in NO₂ and the rate constant at 501 K is 7.93 × 10^-³M^-1s^-1. The reaction half-life at this temperature when [NO₂]0= 0.45 M is __________ s.

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

Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO₂ → 2NO + O₂ In a particular experiment at 300 °C, [NO₂] drops from 0.0100 to 0.00650 M in 100 s. The rate of disappearance of NO₂ for this period is __________ M/s.

Which substance in the reaction below either appears or disappears the fastest? 4NH₃ + 7O₂ → 4NO₂ + 6H₂O