The rate law for the reaction H2O2 + 2H+ + 2I - F1F1F1S1F1F1F10 I2 + 2H2O is rate = k[H2O2][I -]. The following mechanism has been suggested. 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- A) H+ and I - B) H+ and HOI C) HOI and OH- D) H+ only E) H2O and OH-

Given that Ea for a certain biological reaction is 48 kJ/mol and that the rate constant is 2.5 F1F1F1S1F1F1F10 10-2 s-1 at 15°C, what is the rate constant at 37°C?

A) 2.7 F1F1F1S1F1F1F10 10-2 s-1 B) 2.5 F1F1F1S1F1F1F10 10-1 s-1 C) 1.0 F1F1F1S1F1F1F10 10-1 s-1 D) 6.0 F1F1F1S1F1F1F10 10-3 s-1 E) 1.1 s-1 A) 2.7 F1F1F1S1F1F1F10 10-2 s-1 B) 2.5 F1F1F1S1F1F1F10 10-1 s-1 C) 1.0 F1F1F1S1F1F1F10 10-1 s-1 D) 6.0 F1F1F1S1F1F1F10 10-3 s-1 E) 1.1 s-1

For the reaction X2 + Y + Z F1F1F1S1F1F1F10 XY + XZ, it is found that the rate equation is rate = k [X2][Y]. Why does the concentration of Z have no effect on the rate?

A) The concentration of Z is very small and the others are very large. B) Z must react in a step after the rate determining step. C) Z is an intermediate. D) The fraction of molecules of Z that have very high energies is zero. E) The activation energy for Z to react is very high. A) The concentration of Z is very small and the others are very large. B) Z must react in a step after the rate determining step. C) Z is an intermediate. D) The fraction of molecules of Z that have very high energies is zero. E) The activation energy for Z to react is very high.

The data below were determined for the reaction shown below. S2O82- + 3I - (aq)F1F1F1S1F1F1F10 2SO42- + I3- The rate law for this reaction must be:

A) rate = k[S2O82- ][I -]3 B) rate = k[S2O82-] C) rate = k[S2O82-]2[I -]2 D) rate = k[I -] E) rate = k[S2O82-][I -] A) rate = k[S2O82- ][I -]3 B) rate = k[S2O82-] C) rate = k[S2O82-]2[I -]2 D) rate = k[I -] E) rate = k[S2O82-][I -]

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.

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 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

Exam 13: Chemical Kinetics

The isomerization of cyclopropane to form propene is a first-order reaction. At 760 K, 85% of a sample of cyclopropane changes to propene in 79.0 min. Determine the rate constant for this reaction at 760 K.

(Multiple Choice)

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Question 21

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.

(True/False)

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Question 22

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 thos same conditions?

(Multiple Choice)

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Question 23

It takes 42.0 min for the concentration of a reactant in a first-order reaction to drop from 0.45 M to 0.32 M at 25°C. How long will it take for the reaction to be 90% complete?

(Multiple Choice)

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Question 24

For the overall chemical reaction shown below, which one of the following statements can be rightly assumed? 2H₂S(g)+ O₂(g) 2S(s)+ 2H₂O(l)

(Multiple Choice)

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Question 25

A rate constant will have the units mol L^-1 s^-1 when the reaction is overall

(Multiple Choice)

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Question 26

The rate law for the reaction H₂O₂ + 2H⁺ + 2I^- I₂ + 2H₂O is rate = k[H₂O₂][I^-]. The following mechanism has been suggested. Identify all intermediates included in this mechanism.

(Multiple Choice)

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Question 27

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?

(Multiple Choice)

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Question 28

At a certain temperature, the data below were collected for the reaction below. 2ICl + H₂  I₂ + 2HCl. Determine the rate constant for the reaction.

(Short Answer)

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Question 29

For the reaction X₂ + Y + Z  XY + XZ, it is found that the rate equation is rate = k [X₂][Y]. Why does the concentration of Z have no effect on the rate?

(Multiple Choice)

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Question 30

For a second order reaction, the half-life is equal to

(Multiple Choice)

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Question 31

Complete the following statement: A catalyst

(Multiple Choice)

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Question 32

Nitrous oxide (N₂O)decomposes at 600°C according to the balanced equation 2N₂O(g) 2N₂(g)+ O₂(g) A reaction mechanism involving three steps is shown below. Identify all of the catalysts in the following mechanism. Cl₂(g) 2Cl(g) N₂O(g)+ Cl(g) N₂(g)+ ClO(g)(occurs twice) ClO(g)+ ClO(g) Cl₂(g)+ O₂(g)

(Multiple Choice)

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Question 33

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?

(Multiple Choice)

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Question 34

A reaction mechanism usually is

(Multiple Choice)

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Question 35

The data below were determined for the reaction shown below. S₂O₈^2- + 3I ^- (aq) 2SO₄^2- + I₃^- The rate law for this reaction must be:

(Multiple Choice)

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Question 36

Nitrogen pentoxide decomposes by a first-order process yielding N₂O₄ and oxygen. 2N₂O₅  2N₂O₄ + O₂ At a given temperature, the half-life of N₂O₅ is 0.90 hr. What is the first-order rate constant for N₂O₅ decomposition?

(Short Answer)

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Question 37

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)?

(Multiple Choice)

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Question 38

The first-order decomposition of phosphene to phosphorus and hydrogen 4PH₃(g) P₄(g)+ 6H₂(g) Has a half-life of 35.0 s at 680°C. Starting with 520 mmHg of pure phosphene in an 8.00-L flask at 680°C, how long will it take for the total pressure in the flask to rise to 1.000 atm?

(Multiple Choice)

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Question 39

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.

(Multiple Choice)

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Question 40

Showing 21 - 40 of 114

Exam 13: Chemical Kinetics

The isomerization of cyclopropane to form propene is a first-order reaction. At 760 K, 85% of a sample of cyclopropane changes to propene in 79.0 min. Determine the rate constant for this reaction at 760 K.

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.

It takes 42.0 min for the concentration of a reactant in a first-order reaction to drop from 0.45 M to 0.32 M at 25°C. How long will it take for the reaction to be 90% complete?

For the overall chemical reaction shown below, which one of the following statements can be rightly assumed? 2H2S(g)+ O2(g) 2S(s)+ 2H2O(l)

A rate constant will have the units mol L-1 s-1 when the reaction is overall

The rate law for the reaction H2O2 + 2H+ + 2I -  I2 + 2H2O is rate = k[H2O2][I -]. The following mechanism has been suggested. Identify all intermediates included in this mechanism.

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?

At a certain temperature, the data below were collected for the reaction below. 2ICl + H2  I2 + 2HCl. Determine the rate constant for the reaction.

For the reaction X2 + Y + Z  XY + XZ, it is found that the rate equation is rate = k [X2][Y]. Why does the concentration of Z have no effect on the rate?

For a second order reaction, the half-life is equal to

Complete the following statement: A catalyst

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?

A reaction mechanism usually is

The data below were determined for the reaction shown below. S2O82- + 3I - (aq) 2SO42- + I3- The rate law for this reaction must be:

Nitrogen pentoxide decomposes by a first-order process yielding N2O4 and oxygen. 2N2O5  2N2O4 + O2 At a given temperature, the half-life of N2O5 is 0.90 hr. What is the first-order rate constant for N2O5 decomposition?

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)?

The first-order decomposition of phosphene to phosphorus and hydrogen 4PH3(g) P4(g)+ 6H2(g) Has a half-life of 35.0 s at 680°C. Starting with 520 mmHg of pure phosphene in an 8.00-L flask at 680°C, how long will it take for the total pressure in the flask to rise to 1.000 atm?

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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For the overall chemical reaction shown below, which one of the following statements can be rightly assumed? 2H₂S(g)+ O₂(g) 2S(s)+ 2H₂O(l)

A rate constant will have the units mol L^-1 s^-1 when the reaction is overall

The rate law for the reaction H₂O₂ + 2H⁺ + 2I^- I₂ + 2H₂O is rate = k[H₂O₂][I^-]. The following mechanism has been suggested. Identify all intermediates included in this mechanism.

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?

At a certain temperature, the data below were collected for the reaction below. 2ICl + H₂  I₂ + 2HCl. Determine the rate constant for the reaction.

For the reaction X₂ + Y + Z  XY + XZ, it is found that the rate equation is rate = k [X₂][Y]. Why does the concentration of Z have no effect on the rate?

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?

The data below were determined for the reaction shown below. S₂O₈^2- + 3I ^- (aq) 2SO₄^2- + I₃^- The rate law for this reaction must be:

Nitrogen pentoxide decomposes by a first-order process yielding N₂O₄ and oxygen. 2N₂O₅  2N₂O₄ + O₂ At a given temperature, the half-life of N₂O₅ is 0.90 hr. What is the first-order rate constant for N₂O₅ decomposition?

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)?

The first-order decomposition of phosphene to phosphorus and hydrogen 4PH₃(g) P₄(g)+ 6H₂(g) Has a half-life of 35.0 s at 680°C. Starting with 520 mmHg of pure phosphene in an 8.00-L flask at 680°C, how long will it take for the total pressure in the flask to rise to 1.000 atm?

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.