Question 1

At equilibrium, the relative concentrations of each species is the same as the coefficients in the balanced chemical equation.

Accepted Answer

A) True 
 B)False

Question 2

A doctor has given your patient a prescription of a common amphetamine. What should the patient avoid when taking this medication?

Accepted Answer

A) exercise 
B) fruit juices 
C) alcohol 
D) none of the choices 
A) exercise 
B) fruit juices 
C) alcohol 
D) none of the choices

Question 3

The products of an exothermic reaction contain less energy than do the reactants.

Accepted Answer

A) True 
 B)False

Question 4

A catalyzed, aqueous chemical reaction occurs. Which of the following conditions will reach completion the soonest?

Accepted Answer

A) a low concentration of catalyst 
B) a high concentration of the reactants 
C) a high concentration of catalyst 
D) stirring the reaction mixture 
A) a low concentration of catalyst 
B) a high concentration of the reactants 
C) a high concentration of catalyst 
D) stirring the reaction mixture

Question 5

Catalysts may lower the activation energy.

Accepted Answer

A) True 
 B)False

Question 6

​ How does activation energy keep a reaction going without further stimulus or energy from an outside source?

Accepted Answer

Activation energy is the energy needed t

Question 7

Which of the following is most closely related to the term "reaction rate"?

Accepted Answer

A) the temperature needed to initiate a reaction 
B) the position of equilibrium when a reaction stops 
C) the speed of a reaction 
D) more than one response is correct 
A) the temperature needed to initiate a reaction 
B) the position of equilibrium when a reaction stops 
C) the speed of a reaction 
D) more than one response is correct

Question 8

If the reaction A + B → C is exothermic, the concentration of C should increase with increasing temperature.

Accepted Answer

A) True 
 B)False

Question 9

What is the direct cause of a chemical reaction of the type E + F → EF?

Accepted Answer

A) Catalysts are the direct cause of chemical reactions of this type. 
B) The energy in the environment at room temperature causes the reaction. 
C) The electromagnetic attraction between E and F draw them together. 
D) Collisions occurring between E's and F's lead them to reaction. 
A) Catalysts are the direct cause of chemical reactions of this type. 
B) The energy in the environment at room temperature causes the reaction. 
C) The electromagnetic attraction between E and F draw them together. 
D) Collisions occurring between E's and F's lead them to reaction.

Question 10

Reaction rates are determined experimentally.

Accepted Answer

A) True 
 B)False

Question 11

The reaction represented by this energy diagram is endothermic.

Accepted Answer

A) True 
 B)False

Question 12

Which statement applies to equilibria in general?

Accepted Answer

A) The larger the value of K , the closer the amounts of matter on the right and left will be equal. 
B) The larger the value of K , the greater the amount of matter on the right. 
C) The larger the value of K , the greater the amount of matter on the left. 
D) None of these responses are correct because reactions at equilibrium have equal amounts of matter on the left and the right sides of the equation. 
A) The larger the value of K , the closer the amounts of matter on the right and left will be equal. 
B) The larger the value of K , the greater the amount of matter on the right. 
C) The larger the value of K , the greater the amount of matter on the left. 
D) None of these responses are correct because reactions at equilibrium have equal amounts of matter on the left and the right sides of the equation.

Question 13

In a system of equilibrium, it is true that the rate of the forward reaction

Accepted Answer

A) exceeds that of the reverse. 
B) is lower than that of the reverse reaction. 
C) is equal to the rate of the reverse reaction. 
D) More than one response is correct. 
A) exceeds that of the reverse. 
B) is lower than that of the reverse reaction. 
C) is equal to the rate of the reverse reaction. 
D) More than one response is correct.

Question 14

Which of the following will influence all reaction rates?

Accepted Answer

A) the presence of catalysts 
B) the temperature of reactants 
C) the concentration of reactants 
D) more than one response is correct 
A) the presence of catalysts 
B) the temperature of reactants 
C) the concentration of reactants 
D) more than one response is correct

Question 15

Most automobiles function by burning gasoline by a process similar to the equation shown, in which octane is burned. C8H18 + O2 → CO2 + H2O + heat (not balanced)
Using the concept of entropy, interpret the implications of this reaction.

Accepted Answer

A) It goes to the right because it is spontaneous after a spark is supplied. 
B) It explains why a car stops running when there is no gas in the fuel tank. 
C) Gasoline can be made commercially because the reaction can run backwards if the energy is returned to the CO2 and H2O. 
D) All of these responses are correct with respect to entropy. 
A) It goes to the right because it is spontaneous after a spark is supplied. 
B) It explains why a car stops running when there is no gas in the fuel tank. 
C) Gasoline can be made commercially because the reaction can run backwards if the energy is returned to the CO2 and H2O. 
D) All of these responses are correct with respect to entropy.

Question 16

When the equilibrium expression is written for the reaction N2(g)+ 3F2(g)   2NF3(g)
What is the exponent of the concentration of fluorine, F2?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 0 
A) 1 
B) 2 
C) 3 
D) 0

Question 17

Which of the conditions given is necessary for a chemical reaction to occur?

Accepted Answer

A) The molecules of the reacting chemicals must be in motion. 
B) The molecules of the reacting chemicals must bump into each other. 
C) The molecules of the reacting chemicals must be of opposite charges. 
D) The molecules of the reacting chemicals must be at different charges. 
A) The molecules of the reacting chemicals must be in motion. 
B) The molecules of the reacting chemicals must bump into each other. 
C) The molecules of the reacting chemicals must be of opposite charges. 
D) The molecules of the reacting chemicals must be at different charges.

Question 18

The only way to increase the rate of a reaction is to increase the concentration of the reactants.

Accepted Answer

A) True 
 B)False

Question 19

Which of the following is the proper equilibrium expression for the reaction shown below? 2A + B   C + heat

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 20

Sulfur reacts with oxygen to produce sulfur dioxide, but only if the high activation energy is supplied. Which condition will lower the activation energy the most?

Accepted Answer

A) stirring the mixture 
B) heating the mixture 
C) using a catalyst 
D) activation energy cannot be lowered 
A) stirring the mixture 
B) heating the mixture 
C) using a catalyst 
D) activation energy cannot be lowered

Exam 8: Reaction Rates and Equilibrium

At equilibrium, the relative concentrations of each species is the same as the coefficients in the balanced chemical equation.

A doctor has given your patient a prescription of a common amphetamine. What should the patient avoid when taking this medication?

The products of an exothermic reaction contain less energy than do the reactants.

A catalyzed, aqueous chemical reaction occurs. Which of the following conditions will reach completion the soonest?

Catalysts may lower the activation energy.

​ How does activation energy keep a reaction going without further stimulus or energy from an outside source?

Which of the following is most closely related to the term "reaction rate"?

If the reaction A + B → C is exothermic, the concentration of C should increase with increasing temperature.

What is the direct cause of a chemical reaction of the type E + F → EF?

Reaction rates are determined experimentally.

The reaction represented by this energy diagram is endothermic.

Which statement applies to equilibria in general?

In a system of equilibrium, it is true that the rate of the forward reaction

Which of the following will influence all reaction rates?

Most automobiles function by burning gasoline by a process similar to the equation shown, in which octane is burned. C8H18 + O2 → CO2 + H2O + heat (not balanced) Using the concept of entropy, interpret the implications of this reaction.

When the equilibrium expression is written for the reaction N2(g)+ 3F2(g) 2NF3(g) What is the exponent of the concentration of fluorine, F2?

Which of the conditions given is necessary for a chemical reaction to occur?

The only way to increase the rate of a reaction is to increase the concentration of the reactants.

Which of the following is the proper equilibrium expression for the reaction shown below? 2A + B C + heat

Sulfur reacts with oxygen to produce sulfur dioxide, but only if the high activation energy is supplied. Which condition will lower the activation energy the most?

Matter, Measurements, and Calculations

Atoms and Molecules

Electronic Structure and the Periodic Law

Forces Between Particles

Chemical Reactions

The States of Matter

Solutions and Colloids

Acids, Bases, and Salts

Radioactivity and Nuclear Processes

Organic Compounds: Alkanes

Unsaturated Hydrocarbons

Alcohols, Phenols, and Ethers

Aldehydes and Ketones

Carboxylic Acids and Esters

Amines and Amides

Carbohydrates

Lipids

Proteins

Enzymes

Nucleic Acids and Protein Synthesis

Nutrition and Energy for Life

Carbohydrate Metabolism

Lipid and Amino Acid Metabolism

Body Fluids

Filters

How does activation energy keep a reaction going without further stimulus or energy from an outside source?

Most automobiles function by burning gasoline by a process similar to the equation shown, in which octane is burned. C₈H₁₈ + O₂ → CO₂ + H₂O + heat (not balanced) Using the concept of entropy, interpret the implications of this reaction.

When the equilibrium expression is written for the reaction N₂(g)+ 3F₂(g) 2NF₃(g) What is the exponent of the concentration of fluorine, F₂?