An aqueous reaction occurs by a two-step mechanism,shown below. Step 1: A2X2 + Y → A2X + XY Step 2: A2X2 + XY → A2X + X2 + Y What is the catalyst in this reaction?

A) A2X2 B) X2 C) XY D) Y A) A2X2 B) X2 C) XY D) Y

The following set of data was obtained by the method of initial rates for the reaction: (H3C)3CBr + OH- → (H3C)3COH + Br- What is the order of reaction with respect to ion,OH-?

A) zero B) first C) second D) none of these A) zero B) first C) second D) none of these

The second-order reaction 2 Mn(CO)5 → Mn2(CO)10,has a rate constant equal to 3.0 × 109 M-1 s-1 at 25°C.If the initial concentration of Mn(CO)5 is 5.0 × 10-5 M,how long will it take for 90.% of the reactant to disappear?

A) 1.7 × 10-15 s B) 1.9 × 10-14 s C) 6.0 × 10-5 s D) 1.5 × 102 s A) 1.7 × 10-15 s B) 1.9 × 10-14 s C) 6.0 × 10-5 s D) 1.5 × 102 s

Consider a reaction that occurs by the following one-step mechanism: AS1U1B12S1U1B0 + BS1U1B12S1U1B0 → 2 AB The potential energy profile for this reaction is shown below. -What is the species present at reaction stage 2?

A) an intermediate B) a product C) a reactant D) a transition state A) an intermediate B) a product C) a reactant D) a transition state

A gaseous reaction occurs by a two-step mechanism,shown below. Step 1: AX +Y2 ⇌ AXY2 fast Step 2: AXY2 + AX → 2 AXY slow Including concentration of only reactants and products,what is the rate law for this reaction?

A) Rate = k[AX][XY2] B) Rate = k[AXY2]/[AX][Y2] C) Rate = k[AX]2[Y2] D) Rate = k[AXY]2/[A Y2][AX] A) Rate = k[AX][XY2] B) Rate = k[AXY2]/[AX][Y2] C) Rate = k[AX]2[Y2] D) Rate = k[AXY]2/[A Y2][AX]

The following set of data was obtained by the method of initial rates for the reaction: S2O82-(aq)+ 3 I-(aq)→ 2 SO42-(aq)+ I3-(aq) What is the rate law for the reaction?

A) Rate = k[S2O82-][I-] B) Rate = k[S2O82-][I-]5 C) Rate = k[S2O82-][I-]2 D) Rate = k[S2O82-]2[I-] A) Rate = k[S2O82-][I-] B) Rate = k[S2O82-][I-]5 C) Rate = k[S2O82-][I-]2 D) Rate = k[S2O82-]2[I-]

The relative initial rates of the reaction AS1U1B12S1U1B0 + BS1U1B12S1U1B0 → products in vessels (a)-(d)are 1:1:4:4.Unshaded spheres represent AS1U1B12S1U1B0 molecules,and shaded spheres represent BS1U1B12S1U1B0 molecules present at the beginning of the reaction. -What is the order of reaction with respect to B2?

A) 0 B) 1 C) 2 D) 3 A) 0 B) 1 C) 2 D) 3

Exam 13: Chemical Kinetics

The reaction that occurs in a Breathalyzer,a device used to determine the alcohol level in a person's bloodstream,is given below.If the rate of appearance of Cr₂(SO₄)₃ is 1.24 mol/min at a particular moment,what is the rate of disappearance of C₂H₆O at that moment?

(Multiple Choice)

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Question 121

The first-order reaction,SO₂Cl₂ → SO₂ + Cl₂,has a rate constant equal to 2.20 × 10^-5 s^-1 at 593 K.What percentage of the initial amount SO₂Cl₂ will remain after 3.00 hours?

(Multiple Choice)

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Question 122

The decomposition of hydrogen peroxide occurs according to the equation 2 H₂O₂(aq)→ 2 H₂O(l)+ O₂(g) A concentration-time study of this reaction produces a straight line when ln[H₂O₂] is plotted versus time.Therefore,this is a ________ order reaction.

(Short Answer)

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Question 123

An aqueous reaction occurs by a two-step mechanism,shown below. Step 1: A₂X₂ + Y → A₂X + XY Step 2: A₂X₂ + XY → A₂X + X₂ + Y What is the catalyst in this reaction?

(Multiple Choice)

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Question 124

The following set of data was obtained by the method of initial rates for the reaction: (H₃C)₃CBr + OH^- → (H₃C)₃COH + Br^- What is the order of reaction with respect to ion,OH^-?

(Multiple Choice)

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Question 125

The reaction: 2 HI → H₂ + I₂,is second order and the rate constant at 800 K is 9.70 × 10^-2 M^-1 s^-1.How long will it take for 8.00 × 10^-2 mol/L of HI to decrease to one-fourth of its initial concentration?

(Multiple Choice)

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Question 126

The second-order reaction 2 Mn(CO)₅ → Mn₂(CO)₁₀,has a rate constant equal to 3.0 × 10⁹ M^-1 s^-1 at 25°C.If the initial concentration of Mn(CO)₅ is 5.0 × 10^-5 M,how long will it take for 90.% of the reactant to disappear?

(Multiple Choice)

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Question 127

For the reaction shown below,what is the order of reaction with respect to Br^? ClO₂^-(aq)+ 4 Br^-(aq)+ 4 H⁺(aq)→ Cl^-(aq)+ 2 Br₂(aq)+2 H₂O(l)

(Multiple Choice)

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Question 128

Which part of the Arrhenius equation contains a term which measures the number of molecules that have the correct orientation for reaction?

(Multiple Choice)

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Question 129

The decomposition of hydrogen peroxide is given by the following reaction: 2 H₂O₂(aq)→ 2 H₂O(l)+ O₂(g) In the presence of KI the reaction is thought to occur by the following mechanism: Step 1: H₂O₂ + I^- → H₂O + IO^- Step 2: IO^- + H₂O₂ → H₂O + O₂ + I^- What is the role of I^- in this mechanism?

(Multiple Choice)

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Question 130

The reaction below is second order in ClO₂ and first order in OH^-.When the concentration of ClO₂ is 0.020 M and the concentration of OH^- is 0.10 M,the initial rate of reaction is 8.00 × 10^-4 M/s.What is the rate constant,k,for this reaction? 2 ClO₂(aq)+ 2 OH^-(aq)→ ClO₃^-(aq)+ ClO₂^-(aq)+ H₂O(l)

(Short Answer)

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Question 131

Acetaldehyde decomposes at 750 K: CH₃CHO → CO + CH₄.The reaction is first order in acetaldehyde and the half-life of the reaction is found to be 530 seconds.What is the rate constant for the reaction at this temperature?

(Multiple Choice)

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Question 132

Consider a reaction that occurs by the following one-step mechanism: A₂ + B₂ → 2 AB The potential energy profile for this reaction is shown below. -What is the species present at reaction stage 2?

(Multiple Choice)

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Question 133

Consider the first-order decomposition of A molecules (shaded spheres)in two vessels of equal volume.How will the half-life of decomposition in vessel (a)be affected if the volume of the vessel is decreased by a factor of 2?

(Multiple Choice)

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Question 134

Which of the following statements are true about reaction mechanisms? I.A rate law can be written from the molecularity of the slowest elementary step. II.The final rate law can include intermediates. III.The rate of the reaction is dependent on the fastest step in the mechanism. IV.A mechanism can never be proven to be the correct pathway for a reaction.

(Multiple Choice)

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Question 135

Which statement below regarding the half-life of a zeroth-order reaction is true?

(Multiple Choice)

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Question 136

A gaseous reaction occurs by a two-step mechanism,shown below. Step 1: AX +Y₂ ⇌ AXY_{2 fast} Step 2: AXY₂ + AX → 2 AXY slow Including concentration of only reactants and products,what is the rate law for this reaction?

(Multiple Choice)

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Question 137

The decomposition of ammonia to nitrogen and hydrogen on a tungsten filament at 800°C is independent of the concentration of ammonia at high pressures of ammonia.What is the order of the reaction with respect to ammonia?

(Multiple Choice)

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Question 138

The following set of data was obtained by the method of initial rates for the reaction: S₂O₈^2-(aq)+ 3 I^-(aq)→ 2 SO₄^2-(aq)+ I₃^-(aq) What is the rate law for the reaction?

(Multiple Choice)

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Question 139

The relative initial rates of the reaction A₂ + B₂ → products in vessels (a)-(d)are 1:1:4:4.Unshaded spheres represent A₂ molecules,and shaded spheres represent B₂ molecules present at the beginning of the reaction. -What is the order of reaction with respect to B₂?

(Multiple Choice)

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Question 140

Showing 121 - 140 of 190

The reaction that occurs in a Breathalyzer,a device used to determine the alcohol level in a person's bloodstream,is given below.If the rate of appearance of Cr₂(SO₄)₃ is 1.24 mol/min at a particular moment,what is the rate of disappearance of C₂H₆O at that moment?

The first-order reaction,SO₂Cl₂ → SO₂ + Cl₂,has a rate constant equal to 2.20 × 10^-5 s^-1 at 593 K.What percentage of the initial amount SO₂Cl₂ will remain after 3.00 hours?

The decomposition of hydrogen peroxide occurs according to the equation 2 H₂O₂(aq)→ 2 H₂O(l)+ O₂(g) A concentration-time study of this reaction produces a straight line when ln[H₂O₂] is plotted versus time.Therefore,this is a ________ order reaction.

An aqueous reaction occurs by a two-step mechanism,shown below. Step 1: A₂X₂ + Y → A₂X + XY Step 2: A₂X₂ + XY → A₂X + X₂ + Y What is the catalyst in this reaction?

The following set of data was obtained by the method of initial rates for the reaction: (H₃C)₃CBr + OH^- → (H₃C)₃COH + Br^- What is the order of reaction with respect to ion,OH^-?

The reaction: 2 HI → H₂ + I₂,is second order and the rate constant at 800 K is 9.70 × 10^-2 M^-1 s^-1.How long will it take for 8.00 × 10^-2 mol/L of HI to decrease to one-fourth of its initial concentration?

The second-order reaction 2 Mn(CO)₅ → Mn₂(CO)₁₀,has a rate constant equal to 3.0 × 10⁹ M^-1 s^-1 at 25°C.If the initial concentration of Mn(CO)₅ is 5.0 × 10^-5 M,how long will it take for 90.% of the reactant to disappear?

For the reaction shown below,what is the order of reaction with respect to Br^? ClO₂^-(aq)+ 4 Br^-(aq)+ 4 H⁺(aq)→ Cl^-(aq)+ 2 Br₂(aq)+2 H₂O(l)

Which part of the Arrhenius equation contains a term which measures the number of molecules that have the correct orientation for reaction?

Acetaldehyde decomposes at 750 K: CH₃CHO → CO + CH₄.The reaction is first order in acetaldehyde and the half-life of the reaction is found to be 530 seconds.What is the rate constant for the reaction at this temperature?

Consider a reaction that occurs by the following one-step mechanism: A₂ + B₂ → 2 AB The potential energy profile for this reaction is shown below. -What is the species present at reaction stage 2?

Consider the first-order decomposition of A molecules (shaded spheres)in two vessels of equal volume.How will the half-life of decomposition in vessel (a)be affected if the volume of the vessel is decreased by a factor of 2?

Which statement below regarding the half-life of a zeroth-order reaction is true?

A gaseous reaction occurs by a two-step mechanism,shown below. Step 1: AX +Y₂ ⇌ AXY_{2 fast} Step 2: AXY₂ + AX → 2 AXY slow Including concentration of only reactants and products,what is the rate law for this reaction?

The decomposition of ammonia to nitrogen and hydrogen on a tungsten filament at 800°C is independent of the concentration of ammonia at high pressures of ammonia.What is the order of the reaction with respect to ammonia?

The following set of data was obtained by the method of initial rates for the reaction: S₂O₈^2-(aq)+ 3 I^-(aq)→ 2 SO₄^2-(aq)+ I₃^-(aq) What is the rate law for the reaction?

The relative initial rates of the reaction A₂ + B₂ → products in vessels (a)-(d)are 1:1:4:4.Unshaded spheres represent A₂ molecules,and shaded spheres represent B₂ molecules present at the beginning of the reaction. -What is the order of reaction with respect to B₂?

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Exam 13: Chemical Kinetics

The reaction that occurs in a Breathalyzer,a device used to determine the alcohol level in a person's bloodstream,is given below.If the rate of appearance of Cr2(SO4)3 is 1.24 mol/min at a particular moment,what is the rate of disappearance of C2H6O at that moment?

The first-order reaction,SO2Cl2 → SO2 + Cl2,has a rate constant equal to 2.20 × 10-5 s-1 at 593 K.What percentage of the initial amount SO2Cl2 will remain after 3.00 hours?

The decomposition of hydrogen peroxide occurs according to the equation 2 H2O2(aq)→ 2 H2O(l)+ O2(g) A concentration-time study of this reaction produces a straight line when ln[H2O2] is plotted versus time.Therefore,this is a ________ order reaction.

An aqueous reaction occurs by a two-step mechanism,shown below. Step 1: A2X2 + Y → A2X + XY Step 2: A2X2 + XY → A2X + X2 + Y What is the catalyst in this reaction?

The following set of data was obtained by the method of initial rates for the reaction: (H3C)3CBr + OH- → (H3C)3COH + Br- What is the order of reaction with respect to ion,OH-?

The reaction: 2 HI → H2 + I2,is second order and the rate constant at 800 K is 9.70 × 10-2 M-1 s-1.How long will it take for 8.00 × 10-2 mol/L of HI to decrease to one-fourth of its initial concentration?

The second-order reaction 2 Mn(CO)5 → Mn2(CO)10,has a rate constant equal to 3.0 × 109 M-1 s-1 at 25°C.If the initial concentration of Mn(CO)5 is 5.0 × 10-5 M,how long will it take for 90.% of the reactant to disappear?

For the reaction shown below,what is the order of reaction with respect to Br? ClO2-(aq)+ 4 Br-(aq)+ 4 H+(aq)→ Cl-(aq)+ 2 Br2(aq)+2 H2O(l)

Which part of the Arrhenius equation contains a term which measures the number of molecules that have the correct orientation for reaction?

The decomposition of hydrogen peroxide is given by the following reaction: 2 H2O2(aq)→ 2 H2O(l)+ O2(g) In the presence of KI the reaction is thought to occur by the following mechanism: Step 1: H2O2 + I- → H2O + IO- Step 2: IO- + H2O2 → H2O + O2 + I- What is the role of I- in this mechanism?

The reaction below is second order in ClO2 and first order in OH-.When the concentration of ClO2 is 0.020 M and the concentration of OH- is 0.10 M,the initial rate of reaction is 8.00 × 10-4 M/s.What is the rate constant,k,for this reaction? 2 ClO2(aq)+ 2 OH-(aq)→ ClO3-(aq)+ ClO2-(aq)+ H2O(l)

Acetaldehyde decomposes at 750 K: CH3CHO → CO + CH4.The reaction is first order in acetaldehyde and the half-life of the reaction is found to be 530 seconds.What is the rate constant for the reaction at this temperature?

Consider a reaction that occurs by the following one-step mechanism: A2 + B2 → 2 AB The potential energy profile for this reaction is shown below. -What is the species present at reaction stage 2?

Consider the first-order decomposition of A molecules (shaded spheres)in two vessels of equal volume.How will the half-life of decomposition in vessel (a)be affected if the volume of the vessel is decreased by a factor of 2?

Which statement below regarding the half-life of a zeroth-order reaction is true?

A gaseous reaction occurs by a two-step mechanism,shown below. Step 1: AX +Y2 ⇌ AXY2 fast Step 2: AXY2 + AX → 2 AXY slow Including concentration of only reactants and products,what is the rate law for this reaction?

The decomposition of ammonia to nitrogen and hydrogen on a tungsten filament at 800°C is independent of the concentration of ammonia at high pressures of ammonia.What is the order of the reaction with respect to ammonia?

The following set of data was obtained by the method of initial rates for the reaction: S2O82-(aq)+ 3 I-(aq)→ 2 SO42-(aq)+ I3-(aq) What is the rate law for the reaction?

The relative initial rates of the reaction A2 + B2 → products in vessels (a)-(d)are 1:1:4:4.Unshaded spheres represent A2 molecules,and shaded spheres represent B2 molecules present at the beginning of the reaction. -What is the order of reaction with respect to B2?

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Liquids, solids, and Phase Changes

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Thermodynamics: Entropy, free Energy, and Equilibrium

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The Main-Group Elements

Connections to Organic and Biological Chemistry

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The reaction that occurs in a Breathalyzer,a device used to determine the alcohol level in a person's bloodstream,is given below.If the rate of appearance of Cr₂(SO₄)₃ is 1.24 mol/min at a particular moment,what is the rate of disappearance of C₂H₆O at that moment?

The first-order reaction,SO₂Cl₂ → SO₂ + Cl₂,has a rate constant equal to 2.20 × 10^-5 s^-1 at 593 K.What percentage of the initial amount SO₂Cl₂ will remain after 3.00 hours?

The decomposition of hydrogen peroxide occurs according to the equation 2 H₂O₂(aq)→ 2 H₂O(l)+ O₂(g) A concentration-time study of this reaction produces a straight line when ln[H₂O₂] is plotted versus time.Therefore,this is a ________ order reaction.

An aqueous reaction occurs by a two-step mechanism,shown below. Step 1: A₂X₂ + Y → A₂X + XY Step 2: A₂X₂ + XY → A₂X + X₂ + Y What is the catalyst in this reaction?

The following set of data was obtained by the method of initial rates for the reaction: (H₃C)₃CBr + OH^- → (H₃C)₃COH + Br^- What is the order of reaction with respect to ion,OH^-?

The reaction: 2 HI → H₂ + I₂,is second order and the rate constant at 800 K is 9.70 × 10^-2 M^-1 s^-1.How long will it take for 8.00 × 10^-2 mol/L of HI to decrease to one-fourth of its initial concentration?

The second-order reaction 2 Mn(CO)₅ → Mn₂(CO)₁₀,has a rate constant equal to 3.0 × 10⁹ M^-1 s^-1 at 25°C.If the initial concentration of Mn(CO)₅ is 5.0 × 10^-5 M,how long will it take for 90.% of the reactant to disappear?

For the reaction shown below,what is the order of reaction with respect to Br^? ClO₂^-(aq)+ 4 Br^-(aq)+ 4 H⁺(aq)→ Cl^-(aq)+ 2 Br₂(aq)+2 H₂O(l)

Acetaldehyde decomposes at 750 K: CH₃CHO → CO + CH₄.The reaction is first order in acetaldehyde and the half-life of the reaction is found to be 530 seconds.What is the rate constant for the reaction at this temperature?

Consider a reaction that occurs by the following one-step mechanism: A₂ + B₂ → 2 AB The potential energy profile for this reaction is shown below. -What is the species present at reaction stage 2?

A gaseous reaction occurs by a two-step mechanism,shown below. Step 1: AX +Y₂ ⇌ AXY_{2 fast} Step 2: AXY₂ + AX → 2 AXY slow Including concentration of only reactants and products,what is the rate law for this reaction?

The following set of data was obtained by the method of initial rates for the reaction: S₂O₈^2-(aq)+ 3 I^-(aq)→ 2 SO₄^2-(aq)+ I₃^-(aq) What is the rate law for the reaction?

The relative initial rates of the reaction A₂ + B₂ → products in vessels (a)-(d)are 1:1:4:4.Unshaded spheres represent A₂ molecules,and shaded spheres represent B₂ molecules present at the beginning of the reaction. -What is the order of reaction with respect to B₂?