Q: Given the reaction $$4NH_3(g) + 5O_2(g) \rightarrow 4NO(g) + 6H_2O(g)$$, which of the following is the correct expression for the rate in terms of $$O_2$$?

$$\text{Rate} = -\frac{1}{5}\frac{\Delta [O_2$]}{\Delta t}$$

Q: If the concentration of $$C_4H_9Cl$$ decreases from $$0.042\ \mathrm{M} to$$ $$0.017\ \mathrm{M} in$$ $$400\ \mathrm{s}$$, what is the average rate of disappearance of $$C_4H_9Cl$$?

$$6.3 \times 10$$^{-5}$$\ \mathrm{M/s}$$

Q: For the reaction $$2N_2O(g) \rightarrow 2N_2(g) + O_2$(g)$$, if $$0.015$$ mol of $$O_2 is $$produced in $$0.500 L $$over $$15 s$$, what is the average rate of the reaction?

$$2.0 \times 10$$^{-3}$$\ \mathrm{M/s}$$

Question 1

Which of the following best describes the field of chemical kinetics?

Accepted Answer

The study of the rates of chemical reactions and the factors that affect them.

Question 2

Which factor does NOT directly affect the rate of a chemical reaction?

Accepted Answer

Volume of the reaction vessel (if all reactants are in the same phase)

Question 3

For the reaction $$2A \rightarrow B$$, if the rate of disappearance of $$A is$$ $$0.10\ \mathrm{M/s}$$, what is the rate of appearance of $$B$$?

Accepted Answer

$$0.05\ \mathrm{M/s}$$

Question 4

Which of the following is the correct rate law for a reaction that is first order in $$A$$ and second order in $$B$$?

Accepted Answer

$$	ext{Rate} = k[A][B]^2$$

Question 5

A reaction has the following rate law: $$	ext{Rate} = k[A]^1[B]^0. $$What is the overall order of the reaction?

Accepted Answer

First order

Question 6

The instantaneous rate of a reaction at a specific time is determined by:

Accepted Answer

Calculating the slope of the tangent to the concentration vs. time curve at that time.

Question 7

Given the reaction $$4NH_3(g) + 5O_2(g) \rightarrow 4NO(g) + 6H_2O(g)$$, which of the following is the correct expression for the rate in terms of $$O_2$$?

Accepted Answer

$$	ext{Rate} = -\frac{1}{5}\frac{\Delta [O_2$]}{\Delta t}$$

Question 8

If the concentration of $$C_4H_9Cl$$ decreases from $$0.042\ \mathrm{M} to$$ $$0.017\ \mathrm{M} in$$ $$400\ \mathrm{s}$$, what is the average rate of disappearance of $$C_4H_9Cl$$?

Accepted Answer

$$6.3 	imes 10$$^{-5}$$\ \mathrm{M/s}$$

Question 9

Which of the following statements about reaction order is TRUE?

Accepted Answer

Reaction order must be determined experimentally.

Question 10

A catalyst increases the rate of a chemical reaction by:

Accepted Answer

Lowering the activation energy of the reaction.

Question 11

Which CFC listed in the table has the longest atmospheric lifetime, and what is the environmental significance of this?

Accepted Answer

CFC-115; its long lifetime means it persists in the atmosphere, increasing its potential to damage the ozone layer.

Question 12

In a laboratory experiment, the rate law for the reaction $$A + 3B + 2C ightarrow D + 3E$$ was found to be $$	ext{Rate} = k[A][B]. $$What is the overall order of the reaction?

Accepted Answer

Second order

Question 13

Which of the following best explains why CFCs are a concern for the ozone layer?

Accepted Answer

CFCs have long atmospheric lifetimes, allowing them to reach the stratosphere where they release chlorine atoms that destroy ozone.

Question 14

For the reaction $$2N_2O(g) \rightarrow 2N_2(g) + O_2$(g)$$, if $$0.015$$ mol of $$O_2 is $$produced in $$0.500 L $$over $$15 s$$, what is the average rate of the reaction?

Accepted Answer

$$2.0 	imes 10$$^{-3}$$\ \mathrm{M/s}$$

Question 15

Which of the following is a correct statement about the rate constant $$k in a $$rate law?

Accepted Answer

The rate constant $$k is $$temperature dependent.

Question 16

In the context of pharmacokinetics, what does the elimination half-life of a drug represent?

Accepted Answer

The time it takes for the concentration of the drug to decrease to half its original value.

Question 17

Which of the following is NOT a correct method for determining the order of a reaction with respect to a reactant?

Accepted Answer

By inspection of the balanced chemical equation.

Question 18

If a reaction is zeroth order with respect to a reactant, what happens to the rate if the concentration of that reactant is doubled?

Accepted Answer

The rate remains unchanged.

Question 19

Which of the following best describes the difference between average and instantaneous reaction rates?

Accepted Answer

Average rate is measured over a time interval, while instantaneous rate is measured at a specific moment.

Chapter 15 lecture 1

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