Question 1

In a catalyzed chemical reaction, one function of a catalyst is to

Accepted Answer

A) increase the number of successful reactant collisions. 
B) increase the temperature at which the reaction is carried out. 
C) decrease the concentration of reactants. 
D) change the equilibrium concentrations of the products and reactants. 
E) increase the energy given off during the reaction. 
A) increase the number of successful reactant collisions. 
B) increase the temperature at which the reaction is carried out. 
C) decrease the concentration of reactants. 
D) change the equilibrium concentrations of the products and reactants. 
E) increase the energy given off during the reaction. A

Question 2

The ________ is the energy difference between reactants and products in a chemical reaction.

Accepted Answer

A) product energy 
B) heat of reaction 
C) activation energy 
D) overall energy 
E) transition energy 
A) product energy 
B) heat of reaction 
C) activation energy 
D) overall energy 
E) transition energy B

Question 3

Accepted Answer

A) The rate of formation of products is increased. 
B) The equilibrium shifts to produce more products. 
C) The position of the equilibrium remains unchanged. 
D) The catalyst for the reaction is used up. 
E) The equilibrium shifts to produce more reactants. 
A) The rate of formation of products is increased. 
B) The equilibrium shifts to produce more products. 
C) The position of the equilibrium remains unchanged. 
D) The catalyst for the reaction is used up. 
E) The equilibrium shifts to produce more reactants. E

Question 4

The equilibrium constant for the reaction for the decomposition of   to chlorine and   at a certain temperature is  0.042 .
 
If the equilibrium concentrations are   what is the value of

Accepted Answer

A)   0.0010 M 
B)   0.042 M 
C)  0.0020 M 
D)   0.010 M 
E)   0.024 M 
A)   0.0010 M 
B)   0.042 M 
C)  0.0020 M 
D)   0.010 M 
E)   0.024 M

Question 5

A chemical reaction has reached equilibrium when

Accepted Answer

A) all reactants have been converted to products. 
B) all products have been removed from the reaction mixture. 
C) the catalyst has been used up. 
D) the rate of the forward reaction equals the rate of the reverse reaction. 
E) the concentrations of reactants and products are equal. 
A) all reactants have been converted to products. 
B) all products have been removed from the reaction mixture. 
C) the catalyst has been used up. 
D) the rate of the forward reaction equals the rate of the reverse reaction. 
E) the concentrations of reactants and products are equal.

Question 6

Iron metal reacts with oxygen gas to produce iron(III) oxide. What will be the effect of increasing concentration of oxygen gas in a closed reaction vessel?

Accepted Answer

A)  There is no effect; a catalyst is needed. 
B)  The rate of production of iron oxide will slow down. 
C)  More iron oxide will be produced. 
D)  The reaction mixture will catch fire. 
E)  Less reaction will take place. 
A)  There is no effect; a catalyst is needed. 
B)  The rate of production of iron oxide will slow down. 
C)  More iron oxide will be produced. 
D)  The reaction mixture will catch fire. 
E)  Less reaction will take place.

Question 7

For the following reaction, the equilibrium constant    is  0.60  at a certain temperature. If the concentration of  NO(g)  and  NOBr(g) are both  0.50 M ,at equilibrium, what is the concentration of

Accepted Answer

A) 0.60 M 
B) 1.7 M 
C) 2.8 M 
D) 1.0 M 
E) 0.36 M 
A) 0.60 M 
B) 1.7 M 
C) 2.8 M 
D) 1.0 M 
E) 0.36 M

Question 8

For the following reaction, the equilibrium constant   is  2.0 . If the concentration of both products is  0.10 M at equilibrium, what is the concentration of NOBr?

Accepted Answer

A)    
B)   2.2 M 
C)    
D)    
E)    
A)    
B)   2.2 M 
C)    
D)    
E)

Question 9

The equation for the formation of ammonia from nitrogen and hydrogen is shown below. What is the form of the equilibrium expression?

Accepted Answer

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

Question 10

For the reaction at equilibrium, if the concentration of   is increased, will the equilibrium shift in the direction i reactants, products, or stay the same?

Accepted Answer

A)  reactants 
B)  products 
C)  stay the same 
A)  reactants 
B)  products 
C)  stay the same

Question 11

The equilibrium constant for the production of carbon dioxide from carbon monoxide and oxygen is  
This means that the reaction mixture at equilibrium is likely to consist of

Accepted Answer

A)  mostly starting materials. 
B)  twice as much product as starting material. 
C)  an equal mixture of products and reactants. 
D)  mostly products. 
E)  twice as much starting material as product. 
A)  mostly starting materials. 
B)  twice as much product as starting material. 
C)  an equal mixture of products and reactants. 
D)  mostly products. 
E)  twice as much starting material as product.

Question 12

For the reaction at equilibrium, if   is removed, the amount of   present will

Accepted Answer

A)  increase 
B)  decrease 
C)  stay the same 
A)  increase 
B)  decrease 
C)  stay the same

Question 13

For the reaction at equilibrium, if the volume of the container is decreased, the amount of NO present will

Accepted Answer

A) stay the same. 
B) decrease. 
C) double. 
D) increase. 
E) triple. 
A) stay the same. 
B) decrease. 
C) double. 
D) increase. 
E) triple.

Question 14

The activation energy of a chemical reaction is the energy that

Accepted Answer

A) is the difference in the energies of the starting materials and products. 
B) is needed to initiate the reaction. 
C) must be released from the mixture. 
D) must be removed from the mixture. 
E) activates the catalyst. 
A) is the difference in the energies of the starting materials and products. 
B) is needed to initiate the reaction. 
C) must be released from the mixture. 
D) must be removed from the mixture. 
E) activates the catalyst.

Question 15

The reaction for the decomposition of   to chlorine and   is shown below.
 
If the equilibrium concentrations are  
what is the value of the equilibrium constant?

Accepted Answer

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

Question 16

The physiological equilibrium system that keeps the temperature of the body constant is called

Accepted Answer

A) catalysis. 
B) homeostasis. 
C) metabolism. 
D) stimulation. 
E) regulation. 
A) catalysis. 
B) homeostasis. 
C) metabolism. 
D) stimulation. 
E) regulation.

Question 17

What is the correct form of the equilibrium expression?

Accepted Answer

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

Question 18

For the reaction at equilibrium, if the volume is increased, will the equilibrium shift in the direction of reactants, products, or stay the same?

Accepted Answer

A) reactants 
B) products 
C) stay the same 
A) reactants 
B) products 
C) stay the same

Question 19

The rule or principle that describes the effect of changing reaction conditions on an equilibrium is known as
________ principle.

Accepted Answer

The answer of The rule or principle that describes the...

Question 20

For the reaction at equilibrium, if the volume of the container is increased, the amount of PCl5 present will

Accepted Answer

A) stay the same. 
B) decrease. 
C) triple. 
D) double. 
E) increase. 
A) stay the same. 
B) decrease. 
C) triple. 
D) double. 
E) increase.

Exam 10: Reaction Rates and Chemical Equilibrium

In a catalyzed chemical reaction, one function of a catalyst is to

The ________ is the energy difference between reactants and products in a chemical reaction.

The equilibrium constant for the reaction for the decomposition of to chlorine and at a certain temperature is 0.042 . If the equilibrium concentrations are what is the value of

A chemical reaction has reached equilibrium when

Iron metal reacts with oxygen gas to produce iron(III) oxide. What will be the effect of increasing concentration of oxygen gas in a closed reaction vessel?

For the following reaction, the equilibrium constant is 0.60 at a certain temperature. If the concentration of NO(g) and NOBr(g) are both 0.50 M ,at equilibrium, what is the concentration of

For the following reaction, the equilibrium constant is 2.0 . If the concentration of both products is 0.10 M at equilibrium, what is the concentration of NOBr?

The equation for the formation of ammonia from nitrogen and hydrogen is shown below. What is the form of the equilibrium expression?

For the reaction at equilibrium, if the concentration of is increased, will the equilibrium shift in the direction i reactants, products, or stay the same?

The equilibrium constant for the production of carbon dioxide from carbon monoxide and oxygen is This means that the reaction mixture at equilibrium is likely to consist of

For the reaction at equilibrium, if is removed, the amount of present will

For the reaction at equilibrium, if the volume of the container is decreased, the amount of NO present will

The activation energy of a chemical reaction is the energy that

The reaction for the decomposition of to chlorine and is shown below. If the equilibrium concentrations are what is the value of the equilibrium constant?

The physiological equilibrium system that keeps the temperature of the body constant is called

What is the correct form of the equilibrium expression?

For the reaction at equilibrium, if the volume is increased, will the equilibrium shift in the direction of reactants, products, or stay the same?

The rule or principle that describes the effect of changing reaction conditions on an equilibrium is known as ________ principle.

For the reaction at equilibrium, if the volume of the container is increased, the amount of PCl5 present will

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