Question 1

An experimental drug, D, is known to decompose in the blood stream. Tripling the concentration of the drug increases the decomposition rate by a factor of nine. Write the rate law for decomposition of D and give the units of the rate constant.

Accepted Answer

The rate law is rate = k[D]²,...

Question 2

Substitute natural gas can be synthesized by passing carbon monoxide and hydrogen over Ni or Co at 400°C.   This process is an example of homogeneous catalysis.

Accepted Answer

A) True 
 B)False

Question 3

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) A) and B)
G) C) and D)

Question 4

Given that Ea for a certain biological reaction is 48 kJ/mol and that the rate constant is 2.5 * 10-2 s-1 at 15°C, what is the rate constant at 37°C?

Accepted Answer

A)  2.7 * 10-2 s-1
B)  2.5 * 10-1 s-1
C)  1.0 * 10-1 s-1
D)  6.0 * 10-3 s-1
E)  1.1 s-1F) A) and B)
G) None of the above

Question 5

For the reaction BrO3- + 5Br-+ 6H+  →\rarr→  3Br2 + 3H2O at a particular time, - Δ\DeltaΔ [BrO3-]/ Δ\DeltaΔ t = 1.5 * 10-2 M/s. What is - Δ\DeltaΔ [Br-]/ Δ\DeltaΔ t at the same instant?

Accepted Answer

A)  13 M/s
B)  7.5 * 10-2 M/s
C)  1.5 * 10-2 M/s
D)  3.0 * 10-3 M/s
E)  330 M/s F) C) and D)
G) All of the above

Question 6

Nitric oxide gas (NO) reacts with chlorine gas according to the chemical equation given below. NO + 2  \rarr  NOCl The following initial rates of reaction have been measured for the given reagent concentrations.   Which of the following is the rate law (rate equation) for this reaction? A) rate = k[NO] B) rate = k[NO][Cl2]1/2 C) rate = k[NO][Cl2] D) rate = k[NO]2[Cl2] E) rate = k[NO]2[Cl2]2 " class="answers-bank-image d-inline" rel="preload" > Cl2  →\rarr→  NOCl
The following initial rates of reaction have been measured for the given reagent concentrations. 2  \rarr  NOCl The following initial rates of reaction have been measured for the given reagent concentrations.   Which of the following is the rate law (rate equation) for this reaction? A) rate = k[NO] B) rate = k[NO][Cl2]1/2 C) rate = k[NO][Cl2] D) rate = k[NO]2[Cl2] E) rate = k[NO]2[Cl2]2 " 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[NO]
B)  rate = k[NO][Cl2]1/2
C)  rate = k[NO][Cl2]
D)  rate = k[NO]2[Cl2]
E)  rate = k[NO]2[Cl2]2 F) A) and B)
G) A) and C)

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 * 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) A) and D)
G) A) and E)

Question 8

At a certain temperature, the data below were collected for the reaction below.
2ICl + H2 $\rarr$I2 + 2HCl.
Determine the rate law for the reaction.

Accepted Answer

rate = k[I...

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) C) and E)
G) A) and B)

Question 10

The rate law for the reaction H2O2 + 2H+ + 2I -  →\rarr→  I2 + 2H2O is rate = k[H2O2][I -]. The following mechanism has been suggested. H2O2 + I -  →\rarr→  HOI + OH -  slow
OH -  + H+  →\rarr→  H2O fast
HOI + H+ + I -  →\rarr→  I2 + H2O fast
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) D) and E)

Question 11

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 * 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) A) and D)
G) A) and C)

Question 12

The activation energy of a certain uncatalyzed reaction is 64 kJ/mol. In the presence of a catalyst, the Ea is 55 kJ/mol. How many times faster is the catalyzed than the uncatalyzed reaction at 400°C? Assume that the frequency factor remains the same.

Accepted Answer

A)  5.0 times
B)  1.16 times
C)  15 times
D)  2.0 times
E)  0.2 timesF) C) and D)
G) A) and C)

Question 13

The reaction A + 2B  →\rarr→  products was found to have the rate law, rate = k[A] [B]2. Predict by what factor the rate of reaction will increase when the concentration of A is doubled and the concentration of B is also doubled.

Accepted Answer

A)  2
B)  4
C)  6
D)  8
E)  9 F) A) and E)
G) B) and C)

Question 14

A certain first-order reaction A  →\rarr→  B is 25% complete in 42 min at 25°C. What is its rate constant?

Accepted Answer

A)  6.8 * 10-3 min-1
B)  8.3 * 10-3 min-1
C)  3.3 * 10-2 min-1
D)  -3.3 * 10-2 min-1
E)  11 min-1 F) A) and C)
G) A) and E)

Question 15

The isomerization of cyclopropane to form propene is a first-order reaction. -2 min B) 2.5 min C) 23 min D) 29 min E) 230 min" class="answers-bank-image d-inline" rel="preload" > At 760 K, 15% of a sample of cyclopropane changes to propene in 6.8 min. What is the half-life of cyclopropane at 760 K?

Accepted Answer

A)  3.4 * 10-2 min
B)  2.5 min
C)  23 min
D)  29 min
E)  230 minF) A) and B)
G) None of the above

Question 16

The reaction C4H10  →\rarr→  C2H6 + C2H4 has an activation energy (Ea) of 350 kJ/mol, and the Ea of the reverse reaction is 260 kJ/mol. Estimate  Δ\DeltaΔ H, in kJ/mol, for the reaction as written above.

Accepted Answer

A)  -90 kJ/mol
B)  +90 kJ/mol
C)  350 kJ/mol
D)  -610 kJ/mol
E)  +610 kJ/mol F) A) and E)
G) A) and D)

Question 17

Benzoyl chloride, C6H5COCl, reacts with water to form benzoic acid, C6H5COOH, and hydrochloric acid. This first-order reaction is 25% complete after 26 s. How much longer would one have to wait in order to obtain 99% conversion of benzoyl chloride to benzoic acid?

Accepted Answer

A)  393 s
B)  419 s
C)  183 s
D)  293 s
E)  209 sF) C) and E)
G) A) and E)

Question 18

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) 
A kinetic study of this reaction under a certain set of conditions yielded the data below. 2(aq) + 2OH-(aq)   \rarr  ClO2-(aq) + ClO3-(aq) + H2O(l)  A kinetic study of this reaction under a certain set of conditions yielded the data below.   A) rate = k[ClO2][OH-] B) rate = k[ClO2]2[OH-] C) rate = k[ClO2][OH-]2 D) rate = k[ClO2]2[OH-]2 E) rate = k[ClO2]4[OH-] " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  rate = k[ClO2][OH-]
B)  rate = k[ClO2]2[OH-]
C)  rate = k[ClO2][OH-]2
D)  rate = k[ClO2]2[OH-]2
E)  rate = k[ClO2]4[OH-] F) None of the above
G) A) and E)

Question 19

For the first-order reaction 2N2O5 $\rarr$2N2O4 + O2 at a particular temperature, the half-life of N2O5 is 0.90 hr. What fraction of the initial concentration of N2O5 will remain after 2.4 hours?

Accepted Answer

The answer of For the first-order reaction 2N2O5 $\rarr$2N2O4 +...

Question 20

Sucrose, C12H22O11, reacts slowly with water in the presence of an acid to form two other sugars, glucose and fructose, both of which have the same molecular formulas, but different structures.
C12H22O11 + H2O $\rarr$C6H12O6 (glucose)+ C6H12O6 (fructose)
The reaction is first order and has a rate constant of 6.2 * 10-5/s at 35°C when the H+ concentration is 0.10 M. Suppose that the initial concentration of sucrose in the solution is 0.40 M. What will the sucrose concentration be after 2.0 hours?

Accepted Answer

The answer of Sucrose, C12H22O11, reacts slowly with water in...

Exam 14: Chemical Kinetics

The activation energy of a certain uncatalyzed reaction is 64 kJ/mol. In the presence of a catalyst, the E_a is 55 kJ/mol. How many times faster is the catalyzed than the uncatalyzed reaction at 400°C? Assume that the frequency factor remains the same.

Correct Answer
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Correct Answer
verified
rate = k[I...
View Answer

Substitute natural gas can be synthesized by passing carbon monoxide and hydrogen over Ni or Co at 400°C. This process is an example of homogeneous catalysis.

Correct Answer
verified

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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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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The reaction A + 2B $\rarr$ products was found to have the rate law, rate = k[A] [B]². Predict by what factor the rate of reaction will increase when the concentration of A is doubled and the concentration of B is also doubled.

Correct Answer
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Correct Answer
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Correct Answer
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For the reaction BrO₃^-+ 5Br^-+ 6H⁺ $\rarr$ 3Br₂ + 3H₂O at a particular time, - $\Delta$ [BrO₃^-]/ $\Delta$ t = 1.5 * 10^-2 M/s. What is - $\Delta$ [Br^-]/ $\Delta$ t at the same instant?

Correct Answer
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The reaction C₄H₁₀ $\rarr$ C₂H₆ + C₂H₄ has an activation energy (E_a) of 350 kJ/mol, and the E_a of the reverse reaction is 260 kJ/mol. Estimate $\Delta$ H, in kJ/mol, for the reaction as written above.

Correct Answer
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Given that E_a for a certain biological reaction is 48 kJ/mol and that the rate constant is 2.5 * 10^-2 s^-1at 15°C, what is the rate constant at 37°C?

Correct Answer
verified

Benzoyl chloride, C₆H₅COCl, reacts with water to form benzoic acid, C₆H₅COOH, and hydrochloric acid. This first-order reaction is 25% complete after 26 s. How much longer would one have to wait in order to obtain 99% conversion of benzoyl chloride to benzoic acid?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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For the first-order reaction 2N₂O₅ $\rarr$ 2N₂O₄ + O₂ at a particular temperature, the half-life of N₂O₅ is 0.90 hr. What fraction of the initial concentration of N₂O₅ will remain after 2.4 hours?

Correct Answer
verified

An experimental drug, D, is known to decompose in the blood stream. Tripling the concentration of the drug increases the decomposition rate by a factor of nine. Write the rate law for decomposition of D and give the units of the rate constant.

Correct Answer
verified
The rate law is rate = k[D]²,...
View Answer

Correct Answer
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The isomerization of cyclopropane to form propene is a first-order reaction. At 760 K, 15% of a sample of cyclopropane changes to propene in 6.8 min. What is the half-life of cyclopropane at 760 K?

Correct Answer
verified

A certain first-order reaction A $\rarr$ B is 25% complete in 42 min at 25°C. What is its rate constant?

Correct Answer
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Exam 14: Chemical Kinetics

The activation energy of a certain uncatalyzed reaction is 64 kJ/mol. In the presence of a catalyst, the Ea is 55 kJ/mol. How many times faster is the catalyzed than the uncatalyzed reaction at 400°C? Assume that the frequency factor remains the same.

Correct AnswerverifiedShow Answer

At a certain temperature, the data below were collected for the reaction below. 2ICl + H2 →\rarr→ I2 + 2HCl. Determine the rate law for the reaction.

Correct Answerverifiedrate = k[I...View AnswerShow Answer

Substitute natural gas can be synthesized by passing carbon monoxide and hydrogen over Ni or Co at 400°C. This process is an example of homogeneous catalysis.

Correct AnswerverifiedShow Answer

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

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) ?

Correct AnswerverifiedShow Answer

The reaction A + 2B →\rarr→ products was found to have the rate law, rate = k[A] [B]2. Predict by what factor the rate of reaction will increase when the concentration of A is doubled and the concentration of B is also doubled.

Correct AnswerverifiedShow Answer

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) A kinetic study of this reaction under a certain set of conditions yielded the data below.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

For the reaction BrO3- + 5Br-+ 6H+ →\rarr→ 3Br2 + 3H2O at a particular time, - Δ\DeltaΔ [BrO3-]/ Δ\DeltaΔ t = 1.5 * 10-2 M/s. What is - Δ\DeltaΔ [Br-]/ Δ\DeltaΔ t at the same instant?

Correct AnswerverifiedShow Answer

The reaction C4H10 →\rarr→ C2H6 + C2H4 has an activation energy (Ea) of 350 kJ/mol, and the Ea of the reverse reaction is 260 kJ/mol. Estimate Δ\DeltaΔ H, in kJ/mol, for the reaction as written above.

Correct AnswerverifiedShow Answer

Given that Ea for a certain biological reaction is 48 kJ/mol and that the rate constant is 2.5 * 10-2 s-1 at 15°C, what is the rate constant at 37°C?

Correct AnswerverifiedShow Answer

Benzoyl chloride, C6H5COCl, reacts with water to form benzoic acid, C6H5COOH, and hydrochloric acid. This first-order reaction is 25% complete after 26 s. How much longer would one have to wait in order to obtain 99% conversion of benzoyl chloride to benzoic acid?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Nitric oxide gas (NO) reacts with chlorine gas according to the chemical equation given below. NO + Cl2 →\rarr→ NOCl The following initial rates of reaction have been measured for the given reagent concentrations. Which of the following is the rate law (rate equation) for this reaction?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

For the first-order reaction 2N2O5 →\rarr→ 2N2O4 + O2 at a particular temperature, the half-life of N2O5 is 0.90 hr. What fraction of the initial concentration of N2O5 will remain after 2.4 hours?

Correct AnswerverifiedShow Answer

An experimental drug, D, is known to decompose in the blood stream. Tripling the concentration of the drug increases the decomposition rate by a factor of nine. Write the rate law for decomposition of D and give the units of the rate constant.

Correct AnswerverifiedThe rate law is rate = k[D]2,...View AnswerShow Answer

Correct AnswerverifiedShow Answer

The isomerization of cyclopropane to form propene is a first-order reaction. At 760 K, 15% of a sample of cyclopropane changes to propene in 6.8 min. What is the half-life of cyclopropane at 760 K?

Correct AnswerverifiedShow Answer

A certain first-order reaction A →\rarr→ B is 25% complete in 42 min at 25°C. What is its rate constant?

Correct AnswerverifiedShow Answer

The activation energy of a certain uncatalyzed reaction is 64 kJ/mol. In the presence of a catalyst, the E_a is 55 kJ/mol. How many times faster is the catalyzed than the uncatalyzed reaction at 400°C? Assume that the frequency factor remains the same.

Correct Answer
verified

Correct Answer
verified
rate = k[I...
View Answer

Correct Answer
verified

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
verified

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
verified

The reaction A + 2B $\rarr$ products was found to have the rate law, rate = k[A] [B]². Predict by what factor the rate of reaction will increase when the concentration of A is doubled and the concentration of B is also doubled.

Correct Answer
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Correct Answer
verified

Correct Answer
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For the reaction BrO₃^-+ 5Br^-+ 6H⁺ $\rarr$ 3Br₂ + 3H₂O at a particular time, - $\Delta$ [BrO₃^-]/ $\Delta$ t = 1.5 * 10^-2 M/s. What is - $\Delta$ [Br^-]/ $\Delta$ t at the same instant?

Correct Answer
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The reaction C₄H₁₀ $\rarr$ C₂H₆ + C₂H₄ has an activation energy (E_a) of 350 kJ/mol, and the E_a of the reverse reaction is 260 kJ/mol. Estimate $\Delta$ H, in kJ/mol, for the reaction as written above.

Correct Answer
verified

Given that E_a for a certain biological reaction is 48 kJ/mol and that the rate constant is 2.5 * 10^-2 s^-1at 15°C, what is the rate constant at 37°C?

Correct Answer
verified

Benzoyl chloride, C₆H₅COCl, reacts with water to form benzoic acid, C₆H₅COOH, and hydrochloric acid. This first-order reaction is 25% complete after 26 s. How much longer would one have to wait in order to obtain 99% conversion of benzoyl chloride to benzoic acid?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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For the first-order reaction 2N₂O₅ $\rarr$ 2N₂O₄ + O₂ at a particular temperature, the half-life of N₂O₅ is 0.90 hr. What fraction of the initial concentration of N₂O₅ will remain after 2.4 hours?

Correct Answer
verified

Correct Answer
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The rate law is rate = k[D]²,...
View Answer

Correct Answer
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Correct Answer
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A certain first-order reaction A $\rarr$ B is 25% complete in 42 min at 25°C. What is its rate constant?

Correct Answer
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