Question 1

A reaction has the following rate law: Rate = k[A][B]² In experiment 1,the concentrations of A and B are both 0.10 mol L^-1;in experiment 2,the concentrations are both 0.30 mol L^-1.If the temperature stays constant,what is the value of the ratio,Rate(2)/Rate(1)?

Accepted Answer

The rate law can be simplified as:

Rate = k'[A][B]

where k' = kS1U1P12S1S1P0S1S1P0.

In experiment 1, [A] = [B] = 0.10 mol/L.

In experiment 2, [A] = [B] = 0.30 mol/L.

Therefore, the ratio of rates can be expressed as:

Rate(2)/Rate(1) = k'[0.30][0.30]/k'[0.10][0.10]

= (0.30/0.10)2

= 32

= 27

Thus, the answer is E.

Question 2

The reaction A $\to$ B is first-order overall and first-order with respect to the reactant A.The result of doubling the initial concentration of A will be to

Accepted Answer

In a first-order reaction, the rate is directly proportional to the concentration of the reactant. Doubling the concentration of A will double the initial rate.

Question 3

Consider the reaction 2NH₃(g) $\to$ N₂(g)+ 3H₂(g) If the rate $\Delta$[H₂]/$\Delta$t is 0.030 mol L^-1 s^-1,then $\Delta$[NH₃]/$\Delta$t is

Accepted Answer

C

Question 4

A study of the decomposition reaction 3RS₂ $\to$ 3R + 6S yields the following initial rate data What is the rate constant for the reaction?

Accepted Answer

The answer of A study of the decomposition reaction 3RS₂...

Question 5

When the reaction A $\to$ B + C is studied,a plot of ln[A]_t vs.time gives a straight line with a negative slope.What is the order of the reaction?

Accepted Answer

A straight line with a negative slope indicates a first-order reaction.

Question 6

Sulfuryl chloride,SO₂Cl₂(g),decomposes at high temperature to form SO₂(g)and Cl₂(g).The rate constant at a certain temperature is 4.68 $\times$ 10^-5s^-1.What is the order of the reaction?

Accepted Answer

The rate constant only depends on the concentration of sulfuryl chloride, indicating that the reaction is first-order with respect to sulfuryl chloride.

Question 7

Which of the following sets of units could be appropriate for a zero-order rate constant?

Accepted Answer

A zero-order rate constant has units of concentration/time. Option E is the only set of units that includes concentration in the form of mol, and time in the form of seconds, both raised to the appropriate powers. The other options either do not include concentration units, include concentration units with the wrong power, or include time units with the wrong power.

Question 8

Ammonium cyanate (NH₄CNO)reacts to form urea (NH₂CONH₂).At 65°C the rate constant,k,is 3.60 L mol^-1s^-1.What is the rate law for this reaction?

Accepted Answer

The rate law for this reaction is determined by the experimentally measured rate constant and the concentrations of the reactants. From the given information, we know that the rate constant (k) is 3.60 L mol^-1 s^-1. The reaction involves only one reactant, ammonium cyanate (NH₄CNO), which means that the rate law must only involve this reactant. The rate law for the reaction can be expressed as: Rate = k [NH₄CNO]^x where x is the order of the reaction with respect to NH₄CNO. To determine x, we need to run the reaction at different concentrations of NH₄CNO and measure the corresponding rates. Since x cannot be determined from the given information, we should look at the answer choices to see which one(s) make sense. Choice B is the best choice because it includes NH₄CNO raised to a power of 2 (²), which suggests that the reaction is second order with respect to NH₄CNO. This makes sense because the product, urea, contains two NH₄CNO molecules. Choice A is incorrect because it only includes NH₄CNO without any indication of the order of the reaction. Choice C is incorrect because it includes a concentration unit of mol L^-1, which is not consistent with the units of the rate constant (L mol^-1 s^-1). Choice D is incorrect because it includes both NH₄CNO and urea, which is not appropriate for a rate law that only involves one reactant. Choice E is incorrect because it includes urea, which is a product and not a reactant.

Question 9

The compound RX₃ decomposes according to the equation 3RX₃ \(\to\0 R + R₂X₃ + 3X₂ In an experiment the following data were collected for the decomposition at 100°C.What is the average rate of reaction over the entire experiment?

Accepted Answer

The answer of The compound RX₃ decomposes according to the...

Question 10

Sucrose decomposes to fructose and glucose in acid solution.When ln [sucrose] is plotted vs.time,a straight line with slope of -0.208 hr^-1 results.What is the rate law for the reaction?

Accepted Answer

The answer of Sucrose decomposes to fructose and glucose in...

Question 11

Consider the general reaction 5Br^-(aq)+ BrO₃^-(aq)+ 6H⁺(aq) $\to$3Br₂(aq)+ 3H₂O(aq) For this reaction,the rate when expressed as $\Delta$[Br₂]/$\Delta$t is the same as

Accepted Answer

The answer of Consider the general reaction 5Br^-(aq)+ BrO₃^-(aq)+ 6H⁺(aq) $\to$3Br₂(aq)+...

Question 12

For the reaction
A(g)+ 2B(g) $\to$ 2C(g)+ 2D(g)
The following data was collected at constant temperature.Determine the correct rate law for this reaction.

Accepted Answer

The answer of For the reaction
A(g)+ 2B(g) $\to$ 2C(g)+ 2D(g)
The...

Question 13

Which one of the following sets of units is appropriate for a second-order rate constant?

Accepted Answer

A second-order rate constant has units of volume per time per unit concentration squared, so the appropriate set of units would include L mol^-1 s^-1. Option C includes these units, as well as the appropriate units for concentration and time. The other options either do not include the appropriate units or include units that are not needed for a second-order rate constant.

Question 14

The rate constant for a reaction is 4.65 L mol^-1s^-1.What is the overall order of the reaction?

Accepted Answer

The overall order of the reaction is the sum of the individual orders of the reactants, which can be determined from the rate law. In this case, the rate law is rate = k [S1][U1P1]^2, indicating that the reaction is second order overall (second order in [U1P1] and first order in [S1]).

Question 15

Consider the following reaction 8A(g)+ 5B(g) $\to$ 8C(g)+ 6D(g) If [C] is increasing at the rate of 4.0 mol L^-1s^-1,at what rate is [B] changing?

Accepted Answer

From the balanced equation, we can see that the stoichiometric coefficient ratio of B to C is 5:8. Therefore, if [C] is increasing at a rate of 4.0 mol L^-1 s^-1, then [B] must be changing at a rate of (5/8) x 4.0 = 2.5 mol L^-1 s^-1. Thus, the best choice is B.

Question 16

For the reaction
2A + B + 2C $\to$ D + E
The following initial rate data was collected at constant temperature.Determine the correct rate law for this reaction.All units are arbitrary.

Accepted Answer

The answer of For the reaction
2A + B + 2C...

Question 17

Which one of the following sets of units is appropriate for a third-order rate constant?

Accepted Answer

The answer of Which one of the following sets of...

Question 18

When the reaction A $\to$ B + C is studied,a plot 1/[A]_t vs.time gives a straight line with a positive slope.What is the order of the reaction?

Accepted Answer

The given plot has a straight line with a positive slope, which indicates that the rate of the reaction is directly proportional to the concentration of [A]S1U1B1. Therefore, the reaction is a second-order reaction.

Question 19

Tetrafluoroethylene,C₂F₄,can be converted to octafluorocyclobutane which can be used as a refrigerant or an aerosol propellant.A plot of 1/[C₂F₄] vs.time gives a straight line with a slope of 0.0448 L mol^-1s^-1.What is the rate law for this reaction?

Accepted Answer

The answer of Tetrafluoroethylene,C₂F₄,can be converted to octafluorocyclobutane which can...

Question 20

For the reaction
3A(g)+ 2B(g) $\to$ 2C(g)+ 2D(g)
The following data was collected at constant temperature.Determine the correct rate law for this reaction.

Accepted Answer

The rate law can be determined from the experimental data by comparing the initial rates of reaction for different sets of initial concentrations of reactants. From the given data, we can see that when the concentration of A is doubled, the rate of reaction also doubles. Similarly, when the concentration of B is doubled, the rate of reaction also doubles. This indicates that the reaction rate is directly proportional to the concentration of both A and B, and the correct rate law is Rate = k[A][B]. Option E matches this form, and is therefore the best choice.

Quiz 16: Kinetics: Rates and Mechanisms of Chemical Reactions

A reaction has the following rate law: Rate = k[A][B]² In experiment 1,the concentrations of A and B are both 0.10 mol L^-1;in experiment 2,the concentrations are both 0.30 mol L^-1.If the temperature stays constant,what is the value of the ratio,Rate(2) /Rate(1) ?

The reaction A $\to$ B is first-order overall and first-order with respect to the reactant A.The result of doubling the initial concentration of A will be to

Consider the reaction 2NH₃(g) $\to$ N₂(g) + 3H₂(g) If the rate $\Delta$ [H₂]/ $\Delta$ t is 0.030 mol L^-1 s^-1,then $\Delta$ [NH₃]/ $\Delta$ t is

When the reaction A $\to$ B + C is studied,a plot of ln[A]_t vs.time gives a straight line with a negative slope.What is the order of the reaction?

Sulfuryl chloride,SO₂Cl₂(g) ,decomposes at high temperature to form SO₂(g) and Cl₂(g) .The rate constant at a certain temperature is 4.68 $\times$ 10^-5s^-1.What is the order of the reaction?

Which of the following sets of units could be appropriate for a zero-order rate constant?

Ammonium cyanate (NH₄CNO) reacts to form urea (NH₂CONH₂) .At 65°C the rate constant,k,is 3.60 L mol^-1s^-1.What is the rate law for this reaction?

Sucrose decomposes to fructose and glucose in acid solution.When ln [sucrose] is plotted vs.time,a straight line with slope of -0.208 hr^-1 results.What is the rate law for the reaction?

Consider the general reaction 5Br^-(aq) + BrO₃^-(aq) + 6H⁺(aq) $\to$ 3Br₂(aq) + 3H₂O(aq) For this reaction,the rate when expressed as $\Delta$ [Br₂]/ $\Delta$ t is the same as

Which one of the following sets of units is appropriate for a second-order rate constant?

The rate constant for a reaction is 4.65 L mol^-1s^-1.What is the overall order of the reaction?

Consider the following reaction 8A(g) + 5B(g) $\to$ 8C(g) + 6D(g) If [C] is increasing at the rate of 4.0 mol L^-1s^-1,at what rate is [B] changing?

Which one of the following sets of units is appropriate for a third-order rate constant?

When the reaction A $\to$ B + C is studied,a plot 1/[A]_t vs.time gives a straight line with a positive slope.What is the order of the reaction?

Tetrafluoroethylene,C₂F₄,can be converted to octafluorocyclobutane which can be used as a refrigerant or an aerosol propellant.A plot of 1/[C₂F₄] vs.time gives a straight line with a slope of 0.0448 L mol^-1s^-1.What is the rate law for this reaction?

Quiz 16: Kinetics: Rates and Mechanisms of Chemical Reactions

A reaction has the following rate law: Rate = k[A][B]2 In experiment 1,the concentrations of A and B are both 0.10 mol L-1;in experiment 2,the concentrations are both 0.30 mol L-1.If the temperature stays constant,what is the value of the ratio,Rate(2) /Rate(1) ?

The reaction A →\to→ B is first-order overall and first-order with respect to the reactant A.The result of doubling the initial concentration of A will be to

Consider the reaction 2NH3(g) →\to→ N2(g) + 3H2(g) If the rate Δ\DeltaΔ [H2]/ Δ\DeltaΔ t is 0.030 mol L-1 s-1,then Δ\DeltaΔ [NH3]/ Δ\DeltaΔ t is

A study of the decomposition reaction 3RS2 →\to→ 3R + 6S yields the following initial rate data What is the rate constant for the reaction?

When the reaction A →\to→ B + C is studied,a plot of ln[A]t vs.time gives a straight line with a negative slope.What is the order of the reaction?

Sulfuryl chloride,SO2Cl2(g) ,decomposes at high temperature to form SO2(g) and Cl2(g) .The rate constant at a certain temperature is 4.68 ×\times× 10-5s-1.What is the order of the reaction?

Which of the following sets of units could be appropriate for a zero-order rate constant?

Ammonium cyanate (NH4CNO) reacts to form urea (NH2CONH2) .At 65°C the rate constant,k,is 3.60 L mol-1s-1.What is the rate law for this reaction?

The compound RX3 decomposes according to the equation 3RX3 \(\to\0 R + R2X3 + 3X2 In an experiment the following data were collected for the decomposition at 100°C.What is the average rate of reaction over the entire experiment?

Sucrose decomposes to fructose and glucose in acid solution.When ln [sucrose] is plotted vs.time,a straight line with slope of -0.208 hr-1 results.What is the rate law for the reaction?

Consider the general reaction 5Br-(aq) + BrO3-(aq) + 6H+(aq) →\to→ 3Br2(aq) + 3H2O(aq) For this reaction,the rate when expressed as Δ\DeltaΔ [Br2]/ Δ\DeltaΔ t is the same as

For the reaction A(g) + 2B(g) →\to→ 2C(g) + 2D(g) The following data was collected at constant temperature.Determine the correct rate law for this reaction.

Which one of the following sets of units is appropriate for a second-order rate constant?

The rate constant for a reaction is 4.65 L mol-1s-1.What is the overall order of the reaction?

Consider the following reaction 8A(g) + 5B(g) →\to→ 8C(g) + 6D(g) If [C] is increasing at the rate of 4.0 mol L-1s-1,at what rate is [B] changing?

For the reaction 2A + B + 2C →\to→ D + E The following initial rate data was collected at constant temperature.Determine the correct rate law for this reaction.All units are arbitrary.

Which one of the following sets of units is appropriate for a third-order rate constant?

When the reaction A →\to→ B + C is studied,a plot 1/[A]t vs.time gives a straight line with a positive slope.What is the order of the reaction?

Tetrafluoroethylene,C2F4,can be converted to octafluorocyclobutane which can be used as a refrigerant or an aerosol propellant.A plot of 1/[C2F4] vs.time gives a straight line with a slope of 0.0448 L mol-1s-1.What is the rate law for this reaction?

For the reaction 3A(g) + 2B(g) →\to→ 2C(g) + 2D(g) The following data was collected at constant temperature.Determine the correct rate law for this reaction.

A reaction has the following rate law: Rate = k[A][B]² In experiment 1,the concentrations of A and B are both 0.10 mol L^-1;in experiment 2,the concentrations are both 0.30 mol L^-1.If the temperature stays constant,what is the value of the ratio,Rate(2) /Rate(1) ?

The reaction A $\to$ B is first-order overall and first-order with respect to the reactant A.The result of doubling the initial concentration of A will be to

Consider the reaction 2NH₃(g) $\to$ N₂(g) + 3H₂(g) If the rate $\Delta$ [H₂]/ $\Delta$ t is 0.030 mol L^-1 s^-1,then $\Delta$ [NH₃]/ $\Delta$ t is

When the reaction A $\to$ B + C is studied,a plot of ln[A]_t vs.time gives a straight line with a negative slope.What is the order of the reaction?

Sulfuryl chloride,SO₂Cl₂(g) ,decomposes at high temperature to form SO₂(g) and Cl₂(g) .The rate constant at a certain temperature is 4.68 $\times$ 10^-5s^-1.What is the order of the reaction?

Ammonium cyanate (NH₄CNO) reacts to form urea (NH₂CONH₂) .At 65°C the rate constant,k,is 3.60 L mol^-1s^-1.What is the rate law for this reaction?

Sucrose decomposes to fructose and glucose in acid solution.When ln [sucrose] is plotted vs.time,a straight line with slope of -0.208 hr^-1 results.What is the rate law for the reaction?

Consider the general reaction 5Br^-(aq) + BrO₃^-(aq) + 6H⁺(aq) $\to$ 3Br₂(aq) + 3H₂O(aq) For this reaction,the rate when expressed as $\Delta$ [Br₂]/ $\Delta$ t is the same as

The rate constant for a reaction is 4.65 L mol^-1s^-1.What is the overall order of the reaction?

Consider the following reaction 8A(g) + 5B(g) $\to$ 8C(g) + 6D(g) If [C] is increasing at the rate of 4.0 mol L^-1s^-1,at what rate is [B] changing?

When the reaction A $\to$ B + C is studied,a plot 1/[A]_t vs.time gives a straight line with a positive slope.What is the order of the reaction?

Tetrafluoroethylene,C₂F₄,can be converted to octafluorocyclobutane which can be used as a refrigerant or an aerosol propellant.A plot of 1/[C₂F₄] vs.time gives a straight line with a slope of 0.0448 L mol^-1s^-1.What is the rate law for this reaction?