Question 1

Which statement is a correct application of Le Châtelier's principle?

Accepted Answer

A)   Addition of a substance to the left side of an equilibrium shifts it to the right.
B)   Any stress to the right side of a chemical equilibrium results in a shift to the left to relieve the stress.
C)   Heat added or taken away from a chemical equilibrium in which one side is exothermic will not shift the reaction.
D)   Responses b and c are correct.E) A) and D)
F) None of the above

Question 2

A heterogeneous catalyst will normally dissolve in the reaction mixture.

Accepted Answer

A) True 
 B)False

Question 3

An elderly person comes to you on a winter day with blue fingers and toes,sluggish movement,and slurred speech.What condition do they most likely have?

Accepted Answer

A)   hyperthermia
B)   hypothermia
C)   heat exhaustion
D)   none of the choicesE) All of the above
F) B) and D)

Question 4

Which statement applies to a reaction at equilibrium?

Accepted Answer

A)   The energy of activation has been supplied to bring the reaction to equilibrium.
B)   The state of the equilibrium can be expressed as a ratio.
C)   There are equal amounts of matter on either side of the reaction.
D)   All of the responses are correct.E) B) and D)
F) B) and C)

Question 5

A reaction rate can be described in terms of the change in concentration of either a reactant or a product.

Accepted Answer

A) True 
 B)False

Question 6

Which of the following states of matter generally has the lowest entropy?

Accepted Answer

A)   a crystalline solid
B)   a liquid
C)   a gas
D)   two have the same entropyE) B) and C)
F) C) and D)

Question 7

Which of the following products is not suitable to timed-release method for medications that are desired to have an extended effective level time?

Accepted Answer

A)   appetite control materials
B)   analgesics used for middle-aged people
C)   fluoride compounds in a toothpaste
D)   diureticsE) A) and B)
F) C) and D)

Question 8

Which is assumed to be true in most explanations of how reactions occur?

Accepted Answer

A)   reactant particles must collide with each other
B)   catalysts must be present
C)   energy must be absorbed as the reaction proceeds
D)   more than one response is correctE) B) and D)
F) C) and D)

Question 9

For the reaction below,which of the following would take place once pure A and B are mixed together?
A + B 
C

Accepted Answer

A)   The concentration of C would increase for a time,then remain constant.
B)   The concentration of A would increase for a time,then decrease.
C)   The concentration of B would increase for a time,then remain constant.
D)   More than one response is correct.E) A) and C)
F) A) and B)

Question 10

Catalysts may lower the activation energy.

Accepted Answer

A) True 
 B)False

Question 11

For the reaction NO2 (g)+ N2O(g)  
 3 NO(g)the equilibrium constant expression is:

Accepted Answer

A) True 
 B)False

Question 12

In an exergonic process,the system _____ .

Accepted Answer

A)   gains energy
B)   loses energy
C)   either gains or loses energy
D)   no energy change at allE) None of the above
F) A) and B)

Question 13

Which of the following statements about a K of 3.5 calculated for a specific chemical reaction at equilibrium is incorrect?

Accepted Answer

A)   It was calculated by dividing the product of the products by that of the reactants.
B)   It indicates that one side of the reaction has most of the matter present.
C)   It is an evaluation of the extent of the two chemical reactions involved: the forward and the reverse reactions.
D)   A K of 3.5 indicates that a catalyst will push the reaction to the right.E) All of the above
F) B) and C)

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 correctE) A) and C)
F) All of the above D

Question 15

When a spontaneous process in accompanied by an energy increase,then a large entropy increase must also occur.

Accepted Answer

A) True 
 B)False

Question 16

CFC's such as CF2Cl2,are associated with the increase in chemical activity that degrades ozone.Which of the following relates to this phenomenon?

Accepted Answer

A)   This is not serious because the only area of the planet involved is at the poles and there is very little life to be affected by the increase in UV.
B)   The catalyzing of the ozone breakdown decreases the amount of UV at the surface of the planet.
C)   The process by which the ozone is degraded is catalytic and can be controlled by the reduction of CFC's.
D)   All of these responses are correct.E) C) and D)
F) A) and C) C

Question 17

What is the direct cause of a chemical reaction of the type E + F  →\rarr→  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. E) B) and C)
F) B) and D) D

Question 18

If we add a catalyst to the following equation,which way will the equilibrium shift?
CO + H2O + heat 2O + heat   CO2 + H2 A)  to the left B)  will have no effect C)  to the right D)  not enough information." class="answers-bank-image d-inline" rel="preload" >
CO2 + H2

Accepted Answer

A)   to the left
B)   will have no effect
C)   to the right
D)   not enough information.E) All of the above
F) B) and C)

Question 19

Which of the following would be the equilibrium expression for the system given below?
N2(g) + 3F2(g)  2(g) + 3F2(g)    2NF3(g)  A)    B)    C)    D)   " class="answers-bank-image d-inline" rel="preload" >
2NF3(g)

Accepted Answer

A)  2(g) + 3F2(g)    2NF3(g)  
A)     
B)     
C)     
D)    " class="answers-bank-image d-inline" rel="preload" >
B)  2(g) + 3F2(g)    2NF3(g)  
A)     
B)     
C)     
D)    " class="answers-bank-image d-inline" rel="preload" >
C)  2(g) + 3F2(g)    2NF3(g)  
A)     
B)     
C)     
D)    " class="answers-bank-image d-inline" rel="preload" >
D)  2(g) + 3F2(g)    2NF3(g)  
A)     
B)     
C)     
D)    " class="answers-bank-image d-inline" rel="preload" >E) B) and D)
F) B) and C)

Question 20

A process that gains or accepts energy as it takes place is a(n) _____ .

Accepted Answer

A)   exergonic process
B)   spontaneous process
C)   endergonic process
D)   all of theseE) None of the above
F) A) and C)

Exam 8: Reaction Rates and Equilibrium

Which statement is a correct application of Le Châtelier's principle?

Correct AnswerverifiedShow Answer

A heterogeneous catalyst will normally dissolve in the reaction mixture.

Correct AnswerverifiedShow Answer

An elderly person comes to you on a winter day with blue fingers and toes,sluggish movement,and slurred speech.What condition do they most likely have?

Correct AnswerverifiedShow Answer

Which statement applies to a reaction at equilibrium?

Correct AnswerverifiedShow Answer

A reaction rate can be described in terms of the change in concentration of either a reactant or a product.

Correct AnswerverifiedShow Answer

Which of the following states of matter generally has the lowest entropy?

Correct AnswerverifiedShow Answer

Which of the following products is not suitable to timed-release method for medications that are desired to have an extended effective level time?

Correct AnswerverifiedShow Answer

Which is assumed to be true in most explanations of how reactions occur?

Correct AnswerverifiedShow Answer

For the reaction below,which of the following would take place once pure A and B are mixed together? A + B C

Correct AnswerverifiedShow Answer

Catalysts may lower the activation energy.

Correct AnswerverifiedShow Answer

For the reaction NO2 (g)+ N2O(g) 3 NO(g)the equilibrium constant expression is:

Correct AnswerverifiedShow Answer

In an exergonic process,the system _____ .

Correct AnswerverifiedShow Answer

Which of the following statements about a K of 3.5 calculated for a specific chemical reaction at equilibrium is incorrect?

Correct AnswerverifiedShow Answer

Which of the following will influence all reaction rates?

Correct AnswerverifiedD

When a spontaneous process in accompanied by an energy increase,then a large entropy increase must also occur.

Correct AnswerverifiedShow Answer

CFC's such as CF2Cl2,are associated with the increase in chemical activity that degrades ozone.Which of the following relates to this phenomenon?

Correct AnswerverifiedC

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

Correct AnswerverifiedD

If we add a catalyst to the following equation,which way will the equilibrium shift? CO + H2O + heat CO2 + H2

Correct AnswerverifiedShow Answer

Which of the following would be the equilibrium expression for the system given below? N2(g) + 3F2(g) 2NF3(g)

Correct AnswerverifiedShow Answer

A process that gains or accepts energy as it takes place is a(n) _____ .

Correct AnswerverifiedShow Answer

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For the reaction NO₂ (g)+ N₂O(g) 3 NO(g)the equilibrium constant expression is:

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D

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CFC's such as CF₂Cl₂,are associated with the increase in chemical activity that degrades ozone.Which of the following relates to this phenomenon?

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C

What is the direct cause of a chemical reaction of the type E + F $\rarr$ EF?

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D

If we add a catalyst to the following equation,which way will the equilibrium shift? CO + H₂O + heat CO₂ + H₂

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Which of the following would be the equilibrium expression for the system given below? N₂(g) + 3F₂(g) 2NF₃(g)

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