Question 1

Le Chatelier's Principle states that:

Accepted Answer

A) a disturbing force must be applied to a system in order for it to reach equilibrium. 
B) when a system at equilibrium is disturbed,a new equilibrium constant is established. 
C) when a chemical system at equilibrium is disturbed,the system shifts in order to minimize the effect. 
D) when a chemical system is at equilibrium it is no longer possible to alter the system. 
E) none of the above 
A) a disturbing force must be applied to a system in order for it to reach equilibrium. 
B) when a system at equilibrium is disturbed,a new equilibrium constant is established. 
C) when a chemical system at equilibrium is disturbed,the system shifts in order to minimize the effect. 
D) when a chemical system is at equilibrium it is no longer possible to alter the system. 
E) none of the above C

Question 2

Dissolving the compound PbCl2 into water can be represented as   ,so the equilibrium expression is Ksp =

Accepted Answer

A) True 
 B)False  False

Question 3

For the reaction  
what happens to the equilibrium position if the volume decreases?

Accepted Answer

A) shifts to the left 
B) shifts to the right 
C) does nothing 
D) doubles 
E) halves 
A) shifts to the left 
B) shifts to the right 
C) does nothing 
D) doubles 
E) halves A

Question 4

Increasing the volume of the system below causes the reaction to shift towards the right.

Accepted Answer

A) True 
 B)False

Question 5

For the reaction   .
The equilibrium constant is:

Accepted Answer

A) 0.44 
B) 0.15 
C) 2.3 
D) 6.7 
E) none of the above 
A) 0.44 
B) 0.15 
C) 2.3 
D) 6.7 
E) none of the above

Question 6

When dynamic equilibrium is achieved,the concentrations of reactants is equal to the concentrations of the products.

Accepted Answer

A) True 
 B)False

Question 7

Placing a [ ] around the formula of a chemical means that we are referring to the molar concentration of that chemical.

Accepted Answer

A) True 
 B)False

Question 8

What is the [   ] at equilibrium,given CuS,   ?

Accepted Answer

A) 1.27   M 
B) 6.35   M 
C)    M 
D) 1.61   M 
E) not enough information 
A) 1.27   M 
B) 6.35   M 
C)    M 
D) 1.61   M 
E) not enough information

Question 9

For the reaction  ,what happens to the equilibrium position if aqueous ammonium sulfide is added?

Accepted Answer

A) shifts to the left 
B) shifts to the right 
C) does nothing 
D) doubles 
E) halves 
A) shifts to the left 
B) shifts to the right 
C) does nothing 
D) doubles 
E) halves

Question 10

Le Chatelier's principle states that when a chemical system at equilibrium is disturbed,the system shifts in a direction that minimizes the disturbance.

Accepted Answer

A) True 
 B)False

Question 11

In an exothermic reaction,you can consider the emitted heat as a reactant in this system.

Accepted Answer

A) True 
 B)False

Question 12

For the reaction  ,what happens to the equilibrium position if ammonium sulfate is added?

Accepted Answer

A) shifts to the left 
B) shifts to the right 
C) does nothing 
D) doubles 
E) halves 
A) shifts to the left 
B) shifts to the right 
C) does nothing 
D) doubles 
E) halves

Question 13

Consider the reaction: 
 
Which of the following will cause a shift in the equilibrium to the left? 
1.Remove N2O
2.Remove O2
3.Add N2

Accepted Answer

A) 1 and 2 only 
B) 1 and 3 only 
C) 2 and 3 only 
D) All of 1,2,and 3 
E) Neither 1,2,or 3 
A) 1 and 2 only 
B) 1 and 3 only 
C) 2 and 3 only 
D) All of 1,2,and 3 
E) Neither 1,2,or 3

Question 14

The equilibrium expression for the reaction: 
  .

Accepted Answer

A) True 
 B)False

Question 15

Which of the following is TRUE of a system for which   << 1?

Accepted Answer

A) It will take a long time to reach equilibrium. 
B) It will take a short time to reach equilibrium. 
C) The equilibrium favors the reverse reaction. 
D) The equilibrium favors the forward reaction. 
E) none of the above 
A) It will take a long time to reach equilibrium. 
B) It will take a short time to reach equilibrium. 
C) The equilibrium favors the reverse reaction. 
D) The equilibrium favors the forward reaction. 
E) none of the above

Question 16

Comparing a reaction with a catalyst to the same reaction without the catalyst,each of the following statements is true EXCEPT:

Accepted Answer

A) The rate for the reaction with a catalyst is faster. 
B) The products are the same. 
C) The catalyzed reaction follows a different pathway. 
D) Both reactions would have the same value for the equilibrium constant. 
E) The activation energy is the same for both the catalyzed and uncatalyzed reaction. 
A) The rate for the reaction with a catalyst is faster. 
B) The products are the same. 
C) The catalyzed reaction follows a different pathway. 
D) Both reactions would have the same value for the equilibrium constant. 
E) The activation energy is the same for both the catalyzed and uncatalyzed reaction.

Question 17

Which compound below is the most soluble in water based on its   value?

Accepted Answer

A) CaCO3,   = 4.96   
B) MgCO3,   = 6.82   
C) Fe(OH)2,   = 4.87   
D) AgI,   = 8.51   
E) FeCO3,   = 3.07   
A) CaCO3,   = 4.96   
B) MgCO3,   = 6.82   
C) Fe(OH)2,   = 4.87   
D) AgI,   = 8.51   
E) FeCO3,   = 3.07

Question 18

What happens to the equilibrium position of an exothermic reaction when you remove heat?

Accepted Answer

A) shifts to the left 
B) shifts to the right 
C) does nothing 
D) doubles 
E) halves 
A) shifts to the left 
B) shifts to the right 
C) does nothing 
D) doubles 
E) halves

Question 19

Consider the following endothermic equilibrium reaction: 
Fe2O3 (s)+ 3H2 (g)⇌ 2Fe (s)+ 3 H2O (g)
Which of the following actions will result in a shift to the left (towards reactants)?

Accepted Answer

A) increasing the temperature 
B) increasing the pressure in the container 
C) removing H2O (g) 
D) all of these 
E) none of these 
A) increasing the temperature 
B) increasing the pressure in the container 
C) removing H2O (g) 
D) all of these 
E) none of these

Question 20

Why does the rate of the reaction decrease over time?

Accepted Answer

A) Exothermic reactions lose heat which cools the reaction which decreases reaction rate. 
B) As the reaction proceeds,the concentration of the products results in fewer collisions. 
C) As the reaction proceeds,a decrease in the concentration of reactants results in fewer successful collisions. 
D) Not all molecules will react and some choose to stay in their present form. 
E) none of the above 
A) Exothermic reactions lose heat which cools the reaction which decreases reaction rate. 
B) As the reaction proceeds,the concentration of the products results in fewer collisions. 
C) As the reaction proceeds,a decrease in the concentration of reactants results in fewer successful collisions. 
D) Not all molecules will react and some choose to stay in their present form. 
E) none of the above

Le Chatelier's Principle states that:

Dissolving the compound PbCl₂ into water can be represented as ,so the equilibrium expression is Ksp =

For the reaction what happens to the equilibrium position if the volume decreases?

Increasing the volume of the system below causes the reaction to shift towards the right.

For the reaction . The equilibrium constant is:

When dynamic equilibrium is achieved,the concentrations of reactants is equal to the concentrations of the products.

Placing a [ ] around the formula of a chemical means that we are referring to the molar concentration of that chemical.

What is the [ ] at equilibrium,given CuS, ?

For the reaction ,what happens to the equilibrium position if aqueous ammonium sulfide is added?

Le Chatelier's principle states that when a chemical system at equilibrium is disturbed,the system shifts in a direction that minimizes the disturbance.

In an exothermic reaction,you can consider the emitted heat as a reactant in this system.

For the reaction ,what happens to the equilibrium position if ammonium sulfate is added?

Consider the reaction: Which of the following will cause a shift in the equilibrium to the left? 1.Remove N₂O 2.Remove O₂ 3.Add N₂

The equilibrium expression for the reaction: .

Which of the following is TRUE of a system for which << 1?

Comparing a reaction with a catalyst to the same reaction without the catalyst,each of the following statements is true EXCEPT:

Which compound below is the most soluble in water based on its value?

What happens to the equilibrium position of an exothermic reaction when you remove heat?

Consider the following endothermic equilibrium reaction: Fe₂O₃(s)+ 3H₂(g)⇌ 2Fe (s)+ 3 H₂O (g) Which of the following actions will result in a shift to the left (towards reactants)?

Why does the rate of the reaction decrease over time?

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Exam 15: Chemical Equilibrium

Le Chatelier's Principle states that:

Dissolving the compound PbCl2 into water can be represented as ,so the equilibrium expression is Ksp =

For the reaction what happens to the equilibrium position if the volume decreases?

Increasing the volume of the system below causes the reaction to shift towards the right.

For the reaction . The equilibrium constant is:

When dynamic equilibrium is achieved,the concentrations of reactants is equal to the concentrations of the products.

Placing a [ ] around the formula of a chemical means that we are referring to the molar concentration of that chemical.

What is the [ ] at equilibrium,given CuS, ?

For the reaction ,what happens to the equilibrium position if aqueous ammonium sulfide is added?

Le Chatelier's principle states that when a chemical system at equilibrium is disturbed,the system shifts in a direction that minimizes the disturbance.

In an exothermic reaction,you can consider the emitted heat as a reactant in this system.

For the reaction ,what happens to the equilibrium position if ammonium sulfate is added?

Consider the reaction: Which of the following will cause a shift in the equilibrium to the left? 1.Remove N2O 2.Remove O2 3.Add N2

The equilibrium expression for the reaction: .

Which of the following is TRUE of a system for which << 1?

Comparing a reaction with a catalyst to the same reaction without the catalyst,each of the following statements is true EXCEPT:

Which compound below is the most soluble in water based on its value?

What happens to the equilibrium position of an exothermic reaction when you remove heat?

Consider the following endothermic equilibrium reaction: Fe2O3 (s)+ 3H2 (g)⇌ 2Fe (s)+ 3 H2O (g) Which of the following actions will result in a shift to the left (towards reactants)?

Why does the rate of the reaction decrease over time?

The Chemical World

Measurement and Problem Solving

Matter and Energy

Atoms and Elements

Molecules and Compounds

Chemical Composition

Chemical Reactions

Quantities in Chemical Reactions

Electrons in Atoms and the Periodic Table

Chemical Bonding

Gases

Liquids, solids, and Intermolecular Forces

Solutions

Acids and Bases

Oxidation and Reduction

Radioactivity and Nuclear Chemistry

Organic Chemistry

Biochemistry

Filters

Dissolving the compound PbCl₂ into water can be represented as ,so the equilibrium expression is Ksp =

Consider the reaction: Which of the following will cause a shift in the equilibrium to the left? 1.Remove N₂O 2.Remove O₂ 3.Add N₂

Consider the following endothermic equilibrium reaction: Fe₂O₃(s)+ 3H₂(g)⇌ 2Fe (s)+ 3 H₂O (g) Which of the following actions will result in a shift to the left (towards reactants)?