Reaction Kinetics: Interactive Quizzes and Practice Questions

Question 1

Which of the following is NOT a type of catalyst?

Accepted Answer

Inhibitor

Answer

Homogeneous

Answer

Heterogeneous

Answer

Autocatalyst

Question 2

The rate of a reaction doubles for every 10°C increase in temperature. What is the activation energy of the reaction?

Accepted Answer

83 kJ/mol

Answer

51 kJ/mol

Answer

108 kJ/mol

Answer

132 kJ/mol

Question 3

Which of the following reactions is most likely to be a slow reaction?

Accepted Answer

A + B + C + D → E

Answer

A + B → C

Answer

A + B + C → D

Answer

A + B → C + D

Question 4

Which of the following is a characteristic of an exothermic reaction?

Accepted Answer

ΔH is negative

Answer

ΔH is positive

Answer

Reaction is endothermic

Answer

Reaction is spontaneous

Question 5

In the reaction 2A + B → C, the rate of disappearance of A is:

Accepted Answer

Twice the rate of appearance of C

Answer

Equal to the rate of appearance of C

Answer

Half the rate of appearance of C

Answer

Four times the rate of appearance of C

Question 6

Which of these factors DOES NOT directly influence the rate of a chemical reaction?

Accepted Answer

Pressure

Answer

Concentration of reactants

Answer

Temperature

Answer

Surface area of reactants (for heterogeneous reactions)

Question 7

Which of the following factors does NOT affect the rate of a chemical reaction?

Accepted Answer

Volume of the reaction vessel

Answer

Temperature

Answer

Concentration of reactants

Answer

Surface area of reactants

Question 8

A catalyst is a substance that:

Accepted Answer

Increases the rate of a reaction without being consumed

Answer

Decreases the rate of a reaction without being consumed

Answer

Is consumed during the reaction

Answer

Is a product of the reaction

Question 9

The rate law for a reaction is an expression that:

Accepted Answer

Relates the rate of the reaction to the concentrations of the reactants

Answer

Predicts the equilibrium constant of the reaction

Answer

Determines the activation energy of the reaction

Answer

Identifies the products of the reaction

Question 10

Which of the following is a unit of reaction rate?

Accepted Answer

mol L^-1 s^-1

Answer

M s^-1

Answer

J s^-1

Answer

K s^-1

Question 11

Which of the following reactions is likely to have the fastest rate?

Accepted Answer

A gas reacting with a gas

Answer

A solid reacting with a gas

Answer

A liquid reacting with a gas

Answer

A solution reacting with a solution

Question 12

The overall order of a reaction is the sum of the:

Accepted Answer

Exponents in the rate law

Answer

Coefficients in the balanced chemical equation

Answer

Activation energies of the individual steps in the reaction mechanism

Answer

Half-lives of the individual steps in the reaction mechanism

Question 13

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

Accepted Answer

Pressure of the reaction vessel

Answer

Temperature

Answer

Concentration of reactants

Answer

Presence of a catalyst

Question 14

Which of the following is an example of a heterogeneous catalyst?

Accepted Answer

Activated carbon

Answer

Platinum

Answer

Hydrochloric acid

Answer

Sodium hydroxide

Question 15

Which of the following reactions is NOT a unimolecular reaction?

Accepted Answer

Reaction of hydrogen with oxygen to form water

Answer

Decomposition of hydrogen peroxide

Answer

Dissociation of nitrogen dioxide

Answer

Isomerization of 2-butene

Question 16

What is the order of a reaction with respect to a reactant if doubling its concentration quadruples the reaction rate?

Accepted Answer

Second order

Answer

Zeroth order

Answer

First order

Answer

Third order

Question 17

Which of the following factors does **not** influence the rate of a chemical reaction?

Accepted Answer

Magnetic field strength

Answer

Concentration of reactants

Answer

Temperature

Answer

Surface area of reactants

Question 18

The activation energy of a reaction is defined as:

Accepted Answer

The minimum energy required to initiate a reaction

Answer

The energy released during a reaction

Answer

The maximum energy possible in a reaction

Answer

The rate of a reaction at a given temperature

Question 19

The rate constant of a reaction is a measure of:

Accepted Answer

The rate of the reaction at a given temperature

Answer

The activation energy of the reaction

Answer

The concentration of the reactants

Answer

The effect of a catalyst on the reaction

Question 20

Which of the following reactions is a first-order reaction?

Accepted Answer

2A → B

Answer

A + B → C

Answer

A + 2B → C

Answer

3A → B + C

Question 21

The rate law for a reaction is an equation that:

Accepted Answer

Shows the relationship between the rate of the reaction and the concentrations of the reactants

Answer

Predicts the products of the reaction

Answer

Determines the activation energy of the reaction

Answer

Identifies the catalyst for the reaction

Question 22

Which of the following factors has no influence on the rate of a chemical reaction?

Accepted Answer

Volume of the reaction vessel

Answer

Temperature

Answer

Concentration of reactants

Answer

Surface area of reactants

Question 23

To increase the rate of a reaction, which strategy is ineffective?

Accepted Answer

Decreasing reactant surface area

Answer

Elevating temperature

Answer

Increasing reactant concentration

Answer

Adding a suitable catalyst

Question 24

What is the primary function of a catalyst?

Accepted Answer

Lowering activation energy by providing an alternative reaction pathway

Answer

Increasing reactant concentration

Answer

Absorbing heat from the reaction

Answer

Reacting with reactants to form products

Question 25

The rate law of a reaction:

Accepted Answer

Describes the relationship between reaction rate and reactant concentrations mathematically

Answer

Predicts the products formed in the reaction

Answer

Determines the activation energy of the reaction

Answer

Indicates the order of the reaction with respect to each reactant

Question 26

A zero-order reaction possesses a rate:

Accepted Answer

Independent of reactant concentrations

Answer

Proportional to the concentration of one reactant

Answer

Proportional to the sum of reactant concentrations

Answer

Inversely proportional to reactant concentrations

Question 27

The half-life of a reaction refers to the time required for:

Accepted Answer

Reactant concentration to halve

Answer

Product concentration to double

Answer

Reaction rate to halve

Answer

Temperature to increase by half

Question 28

The SI unit for rate constant is:

Accepted Answer

M^-1s^-1

Answer

M/s

Answer

s

Answer

M/s^2

Question 29

The Arrhenius equation:

Accepted Answer

Relates reaction rate constant to temperature

Answer

Predicts the activation energy from experimental data

Answer

Determines the order of the reaction

Answer

Calculates the half-life of the reaction

Question 30

What is the relationship between activation energy and the rate of a reaction?

Accepted Answer

Higher activation energy, slower reaction

Answer

Higher activation energy, faster reaction

Answer

Lower activation energy, slower reaction

Answer

Lower activation energy, faster reaction

Question 31

What is the effect of increasing the concentration of reactants on the rate of a reaction?

Accepted Answer

Increases the rate

Answer

Decreases the rate

Answer

No effect on the rate

Answer

Cannot be determined

Question 32

What is the order of a reaction that triples in rate when the concentration of one reactant is doubled?

Accepted Answer

Second order

Answer

Zero order

Answer

First order

Answer

Third order

Question 33

What is the half-life of a reaction that is second order?

Accepted Answer

t1/2 = ln(2)/k

Answer

t1/2 = [A]/(k[A])

Answer

t1/2 = k[A]

Answer

t1/2 = [A]/[B]

Question 34

Activation energy is the minimum amount of energy required for

Accepted Answer

Reactants to form a transition state

Answer

Products to form from the transition state

Answer

Reactants to form stable products

Answer

Catalysts to speed up a reaction

Question 35

Which of these describes a characteristic of a catalyst?

Accepted Answer

Lowers the activation energy of a reaction

Answer

Consumed in the reaction

Answer

Reactant in excess

Answer

Changes the equilibrium position

Question 36

Heterogeneous catalysis occurs when the:

Accepted Answer

Catalyst is in a different phase than the reactants

Answer

Catalyst and reactants are in the same phase

Answer

Catalyst is a solid and reactants are a gas

Answer

Catalyst is a liquid and reactants are a solid

Question 37

The order of a reaction with respect to a specific reactant is determined by:

Accepted Answer

The exponent to which the concentration of the reactant is raised in the rate law

Answer

The coefficient of the reactant in the balanced equation

Answer

The slope of the graph of ln(concentration) vs. time

Answer

The rate constant of the reaction

Question 38

A zero-order reaction has a rate constant with units of:

Accepted Answer

M

Answer

M/s

Answer

1/M

Answer

1/Ms

Question 39

The half-life of a reaction is the time taken for:

Accepted Answer

The concentration of reactants to halve

Answer

The concentration of products to double

Answer

The rate of reaction to halve

Answer

The activation energy to be reached

Question 40

What is the minimum energy required for a chemical reaction to occur?

Accepted Answer

Activation energy

Answer

Enthalpy change

Answer

Gibbs free energy

Answer

Kinetic energy

Question 41

What is the half-life of a first-order reaction?

Accepted Answer

t½ = 1/[k]ln(2)

Answer

t½ = 1/[k]

Answer

t½ = [k]ln(2)

Answer

t½ = [k]

Question 42

What is the effect of a catalyst on the equilibrium position of a reversible reaction?

Accepted Answer

The catalyst has no effect on the equilibrium position.

Answer

The catalyst shifts the equilibrium towards the reactants.

Answer

The catalyst shifts the equilibrium towards the products.

Answer

The catalyst decreases the equilibrium constant.

Question 43

Which of the following is a homogeneous catalyst?

Accepted Answer

Sulfuric acid

Answer

Nickel

Answer

Platinum on alumina

Answer

Zeolite

Question 44

What is the order of a reaction with respect to a reactant that has a concentration-time profile that is linear?

Accepted Answer

Zero order

Answer

First order

Answer

Second order

Answer

Cannot be determined

Question 45

Which of the following factors does **not** affect the rate of a chemical reaction?

Accepted Answer

Color of the reaction mixture

Answer

Concentration of reactants

Answer

Surface area of reactants

Answer

Temperature

Question 46

Activation energy is the minimum amount of energy required for a reactant to:

Accepted Answer

React and form products

Answer

Reach its highest energy level

Answer

Break apart into atoms

Answer

Become a catalyst

Question 47

A catalyst speeds up a reaction by:

Accepted Answer

Lowering the activation energy

Answer

Increasing the activation energy

Answer

Consuming one of the reactants

Answer

Producing a new product

Question 48

The rate law of a reaction expresses the:

Accepted Answer

Relationship between the reaction rate and the concentrations of the reactants

Answer

Order of the reaction with respect to each reactant

Answer

Overall change in energy during the reaction

Answer

Equilibrium constant for the reaction

Question 49

In a zero-order reaction, the rate of the reaction:

Accepted Answer

Is independent of reactant concentration

Answer

Doubles when the reactant concentration doubles

Answer

Triples when the reactant concentration triples

Answer

Increases exponentially with increasing reactant concentration

Question 50

A reaction with a high activation energy will:

Accepted Answer

Proceed slowly at low temperatures

Answer

Proceed quickly at low temperatures

Answer

Reach equilibrium quickly

Answer

Be exothermic

Question 51

Which of the following is NOT a method to increase the rate of a reaction?

Accepted Answer

Diluting the reactants

Answer

Increasing the temperature

Answer

Adding a catalyst

Answer

Increasing the surface area of the reactants

Question 52

The half-life of a reaction is the time it takes for:

Accepted Answer

The concentration of the reactants to decrease by half

Answer

The concentration of the products to increase by half

Answer

The rate of the reaction to decrease by half

Answer

The equilibrium constant to reach half its maximum value

Question 53

The Arrhenius equation relates:

Accepted Answer

The rate constant to the temperature and activation energy

Answer

The equilibrium constant to the temperature and enthalpy change

Answer

The half-life to the temperature and concentration

Answer

The activation energy to the frequency factor and temperature

Question 54

Which factor does not influence the rate of a chemical reaction?

Accepted Answer

Shape of the reaction vessel

Answer

Concentration of reactants

Answer

Temperature

Answer

Surface area of reactants

Question 55

Activation energy is the minimum:

Accepted Answer

Amount of energy reactants must possess to form products

Answer

Amount of energy products must possess to form reactants

Answer

Amount of energy a catalyst must possess to function

Answer

Amount of energy required for a reaction to occur

Question 56

Which statement about catalysts is correct?

Accepted Answer

Catalysts lower the activation energy of a reaction

Answer

Catalysts are consumed in a reaction

Answer

Catalysts change the products of a reaction

Answer

Catalysts have no effect on reaction rates

Question 57

A rate law is:

Accepted Answer

An expression that relates the reaction rate to reactant concentrations

Answer

A constant value specific to each reaction

Answer

A measure of the activation energy of the reaction

Answer

The same for all reactions

Question 58

Which reaction order is not possible?

Accepted Answer

Half order

Answer

Zero order

Answer

First order

Answer

Third order

Question 59

The half-life of a reaction is defined as:

Accepted Answer

Time taken for half of the reactants to be consumed

Answer

Time taken for half of the products to be formed

Answer

Rate constant of the reaction

Answer

Activation energy of the reaction

Question 60

Which of the following reactions is heterogeneous?

Accepted Answer

Reaction between a solid and a gas

Answer

Reaction between two gases

Answer

Reaction between an acid and a base

Answer

Reaction between two liquids

Question 61

Autocatalysis occurs when:

Accepted Answer

Products of a reaction act as catalysts for the same reaction

Answer

Reactants of a reaction act as catalysts for the same reaction

Answer

A catalyst is added to the reaction

Answer

Temperature of the reaction is decreased

Question 62

The activation energy of a reaction represents the minimum energy required to:

Accepted Answer

Reach the transition state

Answer

Initiate the reaction

Answer

Break bonds in the reactants

Answer

Form products

Question 63

Which action will increase the reaction rate?

Accepted Answer

Raising the temperature

Answer

Lowering reactant concentration

Answer

Adding an inert gas

Answer

Removing a catalyst

Question 64

A catalyst is a substance that:

Accepted Answer

Lowers activation energy

Answer

Increases activation energy

Answer

Is consumed during the reaction

Answer

Changes the reaction products