Q: Given the reaction: $$2\text{NO}_2(g) \rightarrow 2\text{NO}(g) + \text{O}_2(g)$$, if the rate of disappearance of $$\text{NO}_2 is$$ $$0.10\ \text{mol/L}\cdot\text{s}$$, what is the rate of appearance of $$\text{O}_2$$?

$$0.05\ \text{mol/L}\cdot\text{s}$$

Q: For the reaction $$2\text{SO}_2(g) + \text{O}_2(g) \rightleftharpoons 2\text{SO}_3(g)$$, which of the following is the correct equilibrium expression?

$$K = \dfrac{[\text{SO}_3]^2}{[\text{SO}_2]^2[\text{O}_2]}$$

Question 1

A reaction is observed to proceed twice as fast when the concentration of reactant A is doubled, while the concentration of B is kept constant. What is the order of the reaction with respect to A?

Accepted Answer

First order

Question 2

Which of the following changes will increase the rate of a chemical reaction between a solid and a solution, according to collision theory?

Accepted Answer

Increasing the surface area of the solid

Question 3

Given the reaction: $$2	ext{NO}_2(g) ightarrow 2	ext{NO}(g) + 	ext{O}_2(g)$$, if the rate of disappearance of $$	ext{NO}_2 is$$ $$0.10\ 	ext{mol/L}\cdot	ext{s}$$, what is the rate of appearance of $$	ext{O}_2$$?

Accepted Answer

$$0.05\ 	ext{mol/L}\cdot	ext{s}$$

Question 4

A reaction has the following rate law: $$	ext{Rate} = k[	ext{A}]^2[	ext{B}]. $$What is the overall order of the reaction?

Accepted Answer

Third order

Question 5

For a first-order reaction, which of the following plots will yield a straight line?

Accepted Answer

$$\ln[A] vs. $$time

Question 6

A catalyst increases the rate of a reaction by:

Accepted Answer

Providing an alternative pathway with lower activation energy

Question 7

Given the following mechanism:
Step 1: $$A + B \rightarrow C ($$slow)
Step 2: $$C \rightarrow D ($$fast)
What is the rate law for the overall reaction?

Accepted Answer

$$	ext{Rate} = k[A][B]$$

Question 8

For the reaction $$2	ext{SO}_2(g) + 	ext{O}_2(g) ightleftharpoons 2	ext{SO}_3(g)$$, which of the following is the correct equilibrium expression?

Accepted Answer

$$K = \dfrac{[	ext{SO}_3]^2}{[	ext{SO}_2]^2[	ext{O}_2]}$$

Question 9

A reaction mixture initially contains $$1.0\ 	ext{mol} of$$ $$	ext{N}_2$$ and $$3.0\ 	ext{mol} of$$ $$	ext{H}_2 in a$$ $$1.0\ 	ext{L}$$ container. At equilibrium, $$0.5\ 	ext{mol} of$$ $$	ext{NH}_3 is $$present. For the reaction $$	ext{N}_2(g) + 3	ext{H}_2(g) ightleftharpoons 2	ext{NH}_3(g)$$, what is the equilibrium concentration of $$	ext{H}_2$$?

Accepted Answer

$$2.25\ 	ext{mol/L}$$

Question 10

If the reaction quotient $$Q$$ for a system is less than the equilibrium constant $$K$$, which statement is correct?

Accepted Answer

The reaction will shift to the right to reach equilibrium.

Question 11

Which of the following will NOT affect the value of the equilibrium constant $$K$$ for a reaction?

Accepted Answer

Adding a catalyst

Question 12

For a zeroth-order reaction, what is the correct integrated rate law?

Accepted Answer

$$[A]_t = [A]_0 - kt$$

Question 13

A certain reaction is second order with respect to $$A. If $$the initial concentration of $$A is $$doubled, how does the half-life change?

Accepted Answer

It is halved

Question 14

Which of the following best describes the effect of increasing pressure (by decreasing volume) on the equilibrium of the reaction $$	ext{N}_2(g) + 3	ext{H}_2(g) ightleftharpoons 2	ext{NH}_3(g)$$?

Accepted Answer

The equilibrium shifts toward the side with fewer moles of gas.

Question 15

A reaction has a rate law $$	ext{Rate} = k[	ext{A}]. If $$the rate constant $$k is$$ $$0.693\ 	ext{min}^{-1}$$, what is the half-life $$t_{1/2}$$ for this reaction?

Accepted Answer

$$1.00\ 	ext{min}$$

Question 16

Which of the following statements about reaction mechanisms is correct?

Accepted Answer

The slowest step in a mechanism determines the overall rate law.

Question 17

A student mixes $$0.10\ 	ext{mol} of$$ $$	ext{H}_2$$ and $$0.10\ 	ext{mol} of$$ $$	ext{I}_2 in a$$ $$1.0\ 	ext{L}$$ flask and allows the reaction $$	ext{H}_2(g) + 	ext{I}_2(g) ightleftharpoons 2	ext{HI}(g) to $$reach equilibrium. At equilibrium, $$0.08\ 	ext{mol} of$$ $$	ext{HI} is $$present. What is the value of the equilibrium constant $$K$$?

Accepted Answer

$$16$$

Question 18

Which of the following is a correct statement of Le Chatelier’s principle?

Accepted Answer

A system at equilibrium will shift to minimize the effect of a disturbance.

Question 19

A reaction is found to be zeroth order in $$A$$ and first order in $$B. $$Which of the following is the correct rate law?

Accepted Answer

$$	ext{Rate} = k[B]$$

Reaction Kinetics and Chemical Equilibrium: Study Guide for CHEM 106 Exam 2

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