Question 1

For the reaction $$\mathrm{H_2$ + Cl_2$ \rightarrow 2 HCl}$$, if the rate of disappearance of $$\mathrm{H_2$} is$$ $$0.04\ \mathrm{mol/(L\cdot s)}$$, what is the rate of formation of $$\mathrm{HCl}$$?

Accepted Answer

$$0.08\ \mathrm{mol/(L\cdot s)}$$

Question 2

Which of the following factors will NOT increase the rate of a chemical reaction?

Accepted Answer

Decreasing the surface area of reactants

Question 3

Given the reaction $$\mathrm{2 NO_2$ \rightarrow 2 NO_3$}$$, if $$\mathrm{NO_3$} is $$produced at a rate of $$0.30\ \mathrm{mol/(L\cdot s)}$$, what is the rate of disappearance of $$\mathrm{NO_2$}$$?

Accepted Answer

$$0.30\ \mathrm{mol/(L\cdot s)}$$

Question 4

For the reaction $$\mathrm{4 Fe + 3 O_2$ \rightarrow 2 Fe_2O_3}$$, if $$\mathrm{Fe_2O_3} is $$produced at a rate of $$0.60\ \mathrm{mol/(L\cdot s)}$$, what is the rate of disappearance of $$\mathrm{O_2$}$$?

Accepted Answer

$$0.90\ \mathrm{mol/(L\cdot s)}$$

Question 5

Which of the following best describes the instantaneous rate of a reaction?

Accepted Answer

The rate at a specific moment, determined by the slope of the tangent to the concentration vs. time curve

Question 6

If the rate law for a reaction is $$\mathrm{Rate = k[A][B]^2}$$, what is the overall order of the reaction?

Accepted Answer

Third order

Question 7

A catalyst increases the rate of a reaction by:

Accepted Answer

Lowering the activation energy required for the reaction

Question 8

For a reaction with the rate law $$\mathrm{Rate = k}$$, what are the units of the rate constant $$k$$?

Accepted Answer

$$\mathrm{mol/(L\cdot s)}$$

Question 9

In a laboratory experiment, tripling the concentration of $$\mathrm{Cl_2$}$$ does not change the rate of the reaction $$\mathrm{Cl_2$ \rightarrow 2 Cl}. $$What is the most likely rate law for this reaction?

Accepted Answer

$$\mathrm{Rate = k}$$

Question 10

Which of the following scenarios would most likely result in a higher reaction rate for a gas-phase reaction?

Accepted Answer

Reactants are well mixed

Question 11

For the reaction $$\mathrm{A + B \rightarrow C}$$, the rate law is found to be $$\mathrm{Rate = k[A]^2[B]}. If$$ $$[A] is $$doubled and $$[B] is $$tripled, by what factor does the rate increase?

Accepted Answer

12

Question 12

Which statement about the rate constant $$k is $$TRUE?

Accepted Answer

It is determined experimentally and is constant at a given temperature

Question 13

If the rate law for a reaction is $$\mathrm{Rate = k[A]}$$, what is the effect on the rate if $$[A] is $$halved?

Accepted Answer

The rate is halved

Question 14

Which of the following is a correct expression for the average rate of disappearance of $$\mathrm{H_2$} in $$the reaction $$\mathrm{H_2$ + Cl_2$ \rightarrow 2 HCl}$$ over a time interval $$\Delta t$$?

Accepted Answer

$$-\dfrac{[H_2$]_{final} - [H_2$]_{initial}}{\Delta t}$$

Question 15

A reaction is found to be second order overall. Which of the following could be its rate law?

Accepted Answer

$$\mathrm{Rate = k[A][B]}$$

Question 16

Which of the following best explains why increasing temperature generally increases reaction rate?

Accepted Answer

It increases the number of collisions with sufficient energy to overcome activation energy

Question 17

For a reaction with the rate law $$\mathrm{Rate = k[A]^2}$$, what are the units of $$k$$?

Accepted Answer

$$\mathrm{L/(mol\cdot s)}$$

Question 18

Which of the following is a real-world example of a catalyst in action?

Accepted Answer

Enzymes speeding up metabolic reactions in cells

Question 19

If a reaction is zero order with respect to $$\mathrm{A}$$, what happens to the rate if $$[A] is $$doubled?

Accepted Answer

The rate does not change

CH 12

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