Question 1

How does an enzyme function?

Accepted Answer

A) By forming a lock-and-key model for reactants 
B) By lowering the energy of activation barrier 
C) By shaping proteins in a specific way 
D) By increasing the reaction speed 
A) By forming a lock-and-key model for reactants 
B) By lowering the energy of activation barrier 
C) By shaping proteins in a specific way 
D) By increasing the reaction speed B

Question 2

Enzyme catalysis is a common class of what type of reaction?

Accepted Answer

A) Zero order 
B) First order 
C) Second order 
D) First order to each reactant 
A) Zero order 
B) First order 
C) Second order 
D) First order to each reactant A

Question 3

Why is enhanced surface area important in heterogeneous catalysis?

Accepted Answer

A) Because it provides the maximum number of catalytic sites 
B) Because it provides the minimum number of catalytic sites 
C) Because it activates the catalytic sites 
D) Because it deactivates the catalytic sites 
A) Because it provides the maximum number of catalytic sites 
B) Because it provides the minimum number of catalytic sites 
C) Because it activates the catalytic sites 
D) Because it deactivates the catalytic sites A

Question 4

When a 500-mg medical dosage has degenerated to approximately 63 mg of its original, how many half-lives have passed?

Accepted Answer

A) 4 
B) 3 
C) 2 
D) None of the above 
A) 4 
B) 3 
C) 2 
D) None of the above

Question 5

Why do most reactions increase in rate as the temperature rises?

Accepted Answer

A) The increased kinetic energy enables more successful collisions. 
B) The decreased kinetic energy enables more successful collisions. 
C) The increased kinetic energy enables fewer successful collisions. 
D) The decreased kinetic energy enables fewer successful collisions. 
A) The increased kinetic energy enables more successful collisions. 
B) The decreased kinetic energy enables more successful collisions. 
C) The increased kinetic energy enables fewer successful collisions. 
D) The decreased kinetic energy enables fewer successful collisions.

Question 6

What is the t½ of a substance that is metabolized from 500 mg to 125 mg in the body in 8 hours?

Accepted Answer

Question 7

What are most enzymes made up of?

Accepted Answer

A) Hundreds to thousands of amino acids 
B) Proteins 
C) Small reactant molecules 
D) Specifically sized molecules 
A) Hundreds to thousands of amino acids 
B) Proteins 
C) Small reactant molecules 
D) Specifically sized molecules

Question 8

How does the rate of iron loss compare to the rate of iron(III) oxide formation in the equation 4 Fe + 3 O2 → 2 Fe2O3?

Accepted Answer

A) They are the same. 
B) The iron(III) oxide rate is greater. 
C) It is twice as great. 
D) It is twice as small. 
A) They are the same. 
B) The iron(III) oxide rate is greater. 
C) It is twice as great. 
D) It is twice as small.

Question 9

Why aren't exothermic reactions catalyzed?

Accepted Answer

A) Because the reaction gives off energy 
B) Because the reaction requires minimal or no energy input 
C) Because they occur so quickly 
D) None of the above; they can be catalyzed if necessary. 
A) Because the reaction gives off energy 
B) Because the reaction requires minimal or no energy input 
C) Because they occur so quickly 
D) None of the above; they can be catalyzed if necessary.

Question 10

To what does the dosage interval of many medications correspond?

Accepted Answer

A) The drug half-life 
B) The drug concentration 
C) The drug potency 
D) The insurance policy proscribed half-life 
A) The drug half-life 
B) The drug concentration 
C) The drug potency 
D) The insurance policy proscribed half-life

Question 11

Why are the largest and smallest larvae found in a body at a crime scene collected and preserved?

Accepted Answer

A) They allow the pathologist to know the exact time of death. 
B) They can tell the temperature of the body at the crime scene. 
C) They represent the thinnest and fattest, and give a window into how long the body has been present. 
D) They represent the oldest and youngest, and give a window into how long the body has been present. 
A) They allow the pathologist to know the exact time of death. 
B) They can tell the temperature of the body at the crime scene. 
C) They represent the thinnest and fattest, and give a window into how long the body has been present. 
D) They represent the oldest and youngest, and give a window into how long the body has been present.

Question 12

When two aqueous salt solutions are mixed, how will they react if higher concentrations of each are mixed, versus lower concentrations?

Accepted Answer

A) The concentration does not matter for reaction rate. 
B) Lower concentrations will react more swiftly at the outset. 
C) Higher concentrations will yield more products. 
D) Higher concentrations will react more swiftly at the outset. 
A) The concentration does not matter for reaction rate. 
B) Lower concentrations will react more swiftly at the outset. 
C) Higher concentrations will yield more products. 
D) Higher concentrations will react more swiftly at the outset.

Question 13

What is a zero-order reaction?

Accepted Answer

A reaction that does

Question 14

Under what conditions do most enzymes function?

Accepted Answer

A) Atmospheric pressure 
B) Ambient temperature 
C) Neutral pH ranges 
D) All of the above 
A) Atmospheric pressure 
B) Ambient temperature 
C) Neutral pH ranges 
D) All of the above

Question 15

In the reaction 2 H2 + O2 → 2 H2O, what is the rate of loss of H2 when compared to the rate of H2O formation?

Accepted Answer

A) You cannot tell from the reaction. 
B) H2 loss is greater. 
C) H2O formation is greater. 
D) They are the same. 
A) You cannot tell from the reaction. 
B) H2 loss is greater. 
C) H2O formation is greater. 
D) They are the same.

Question 16

How is reaction rate determined?

Accepted Answer

A) By decrease of reactants with time 
B) By increase of products with time 
C) Both of the above 
D) None of the above 
A) By decrease of reactants with time 
B) By increase of products with time 
C) Both of the above 
D) None of the above

Question 17

How does a reactant concentration in a first-order reaction behave?

Accepted Answer

It mimics

Question 18

How many ADH are required for an insect to go from egg to larva if it normally does so in 16 hours at 30°C?

Accepted Answer

A) 540 
B) 480 
C) 620 
D) 500 
A) 540 
B) 480 
C) 620 
D) 500

Question 19

When reactions are heated, they usually speed up.

Accepted Answer

A) True 
 B)False

Question 20

What are accumulated degree hours?

Accepted Answer

The unit in which th

How does an enzyme function?

Enzyme catalysis is a common class of what type of reaction?

Why is enhanced surface area important in heterogeneous catalysis?

When a 500-mg medical dosage has degenerated to approximately 63 mg of its original, how many half-lives have passed?

Why do most reactions increase in rate as the temperature rises?

What is the t_½ of a substance that is metabolized from 500 mg to 125 mg in the body in 8 hours?

What are most enzymes made up of?

How does the rate of iron loss compare to the rate of iron(III) oxide formation in the equation 4 Fe + 3 O₂ → 2 Fe₂O₃?

Why aren't exothermic reactions catalyzed?

To what does the dosage interval of many medications correspond?

Why are the largest and smallest larvae found in a body at a crime scene collected and preserved?

When two aqueous salt solutions are mixed, how will they react if higher concentrations of each are mixed, versus lower concentrations?

What is a zero-order reaction?

Under what conditions do most enzymes function?

In the reaction 2 H₂ + O₂ → 2 H₂O, what is the rate of loss of H₂ when compared to the rate of H₂O formation?

How is reaction rate determined?

How does a reactant concentration in a first-order reaction behave?

How many ADH are required for an insect to go from egg to larva if it normally does so in 16 hours at 30°C?

When reactions are heated, they usually speed up.

What are accumulated degree hours?

Understanding Our World With Chemistry

Matter: Properties, Changes and Measurements

Understanding Atoms

Bonding and Reactions

Chemistry of Bonding: Structure and Function of Drug Molecules

Aqueous Solutions: Part I

Aqueous Solutions: Part II

Organic Chemistry and Polymers

Chemistry of Fire and Heat

Chemistry of Explosions

Nuclear Chemistry: Energy, Medicine, Weapons, and Terrorism

Chemical Equilibrium

Introduction to Biochemistry

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Exam 11: Applications of Chemical Kinetics

How does an enzyme function?

Enzyme catalysis is a common class of what type of reaction?

Why is enhanced surface area important in heterogeneous catalysis?

When a 500-mg medical dosage has degenerated to approximately 63 mg of its original, how many half-lives have passed?

Why do most reactions increase in rate as the temperature rises?

What is the t½ of a substance that is metabolized from 500 mg to 125 mg in the body in 8 hours?

What are most enzymes made up of?

How does the rate of iron loss compare to the rate of iron(III) oxide formation in the equation 4 Fe + 3 O2 → 2 Fe2O3?

Why aren't exothermic reactions catalyzed?

To what does the dosage interval of many medications correspond?

Why are the largest and smallest larvae found in a body at a crime scene collected and preserved?

When two aqueous salt solutions are mixed, how will they react if higher concentrations of each are mixed, versus lower concentrations?

What is a zero-order reaction?

Under what conditions do most enzymes function?

In the reaction 2 H2 + O2 → 2 H2O, what is the rate of loss of H2 when compared to the rate of H2O formation?

How is reaction rate determined?

How does a reactant concentration in a first-order reaction behave?

How many ADH are required for an insect to go from egg to larva if it normally does so in 16 hours at 30°C?

When reactions are heated, they usually speed up.

What are accumulated degree hours?

Understanding Our World With Chemistry

Matter: Properties, Changes and Measurements

Understanding Atoms

Bonding and Reactions

Chemistry of Bonding: Structure and Function of Drug Molecules

Aqueous Solutions: Part I

Aqueous Solutions: Part II

Organic Chemistry and Polymers

Chemistry of Fire and Heat

Chemistry of Explosions

Nuclear Chemistry: Energy, Medicine, Weapons, and Terrorism

Chemical Equilibrium

Introduction to Biochemistry

Filters

What is the t_½ of a substance that is metabolized from 500 mg to 125 mg in the body in 8 hours?

How does the rate of iron loss compare to the rate of iron(III) oxide formation in the equation 4 Fe + 3 O₂ → 2 Fe₂O₃?

In the reaction 2 H₂ + O₂ → 2 H₂O, what is the rate of loss of H₂ when compared to the rate of H₂O formation?