Question 1

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

Accepted Answer

The change in concentration of a reactant or product per unit time

Question 2

For the reaction $$2NO_2(g) \rightarrow 2NO(g) + O_2$(g)$$, if the rate of disappearance of $$NO_2 is$$ $$0.10\ \mathrm{mol\ L$$^{-1}$$\ s$$^{-1}$$}$$, what is the rate of appearance of $$O_2$$?

Accepted Answer

$$0.05\ \mathrm{mol\ L$$^{-1}$$\ s$$^{-1}$$}$$

Question 3

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

Accepted Answer

The color of the reactants

Question 4

A reaction is found to be first order in $$A. $$Which of the following is the correct integrated rate law for this reaction?

Accepted Answer

$$\ln[A] = -kt + \ln[A]_0$$

Question 5

Which of the following statements about catalysts is TRUE?

Accepted Answer

Catalysts lower the activation energy of a reaction

Question 6

The half-life for a first-order reaction is given by which equation?

Accepted Answer

$$t_{1/2} = \frac{0.693}{k}$$

Question 7

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

Accepted Answer

It increases the number of molecules with sufficient energy to overcome the activation barrier

Question 8

For a reaction with the rate law $$	ext{rate} = k[A][B]^2$$, what is the overall order of the reaction?

Accepted Answer

Third order

Question 9

Which of the following is a correct statement about the effect of surface area on reaction rate?

Accepted Answer

Increasing surface area increases the reaction rate

Question 10

A zero-order reaction has a rate law $$	ext{rate} = k. If$$ $$k = 0.020\ \mathrm{mol\ L$$^{-1}$$\ s$$^{-1}$$}$$ and $$[A]_0 = 0.50\ \mathrm{mol\ L$$^{-1}$$}$$, how long will it take for $$[A] to $$reach zero?

Accepted Answer

$$25\ \mathrm{s}$$

Question 11

Which of the following best describes the transition state in a chemical reaction?

Accepted Answer

The highest energy point along the reaction pathway

Question 12

In enzyme kinetics, what does the Michaelis-Menten constant ($$K_m) $$represent?

Accepted Answer

The substrate concentration at which the reaction rate is half its maximum value

Question 13

Which of the following is a correct expression for the average rate of disappearance of $$A$$ over a time interval $$\Delta t$$?

Accepted Answer

$$-\frac{\Delta [A]}{\Delta t}$$

Question 14

Which of the following is NOT a way that a catalyst can increase the rate of a reaction?

Accepted Answer

Increasing the activation energy required for the reaction

Question 15

A reaction has an activation energy of $$50\ \mathrm{kJ\ $$mol^{-1}$$}. If $$the temperature is increased, what happens to the rate constant $$k$$?

Accepted Answer

It increases

Question 16

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

Accepted Answer

$$	ext{rate} = k[A]$$

Question 17

Which of the following best describes a homogeneous catalyst?

Accepted Answer

A catalyst in the same phase as the reactants

Question 18

If the rate law for a reaction is $$	ext{rate} = k[A]^2$$, what is the unit of the rate constant $$k$$?

Accepted Answer

$$\mathrm{L\ $$mol^{-1}$$\ s$$^{-1}$$}$$

Question 19

Which of the following is a correct statement about the effect of concentration on reaction rate?

Accepted Answer

Increasing the concentration of reactants increases the frequency of collisions

Chemical Kinetics: Reaction Rates, Rate Laws, and Factors Affecting Reaction Rates

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