Question 1

Living things are in equilibrium with their surroundings.

Accepted Answer

A) True 
 B)False

Question 2

According to the collision theory of chemical reactions:

Accepted Answer

A) high energy collisions result in few successful reactions as there isn't sufficient time for the products to react. 
B) low energy collisions result in many successful reactions as there is sufficient time for the reactants to form products. 
C) high energy collisions lead to the successful formation of products. 
D) low energy collisions do not occur in the gas phase. 
E) all of the above 
A) high energy collisions result in few successful reactions as there isn't sufficient time for the products to react. 
B) low energy collisions result in many successful reactions as there is sufficient time for the reactants to form products. 
C) high energy collisions lead to the successful formation of products. 
D) low energy collisions do not occur in the gas phase. 
E) all of the above

Question 3

A system is said to be in dynamic equilibrium when:

Accepted Answer

A) there is no longer any net change in the concentrations of products or reactants. 
B) the forward and reverse reactions come to a halt. 
C) the sum of the concentrations of the reactants is equal to the sum of the concentrations of the products. 
D) you have let the reaction proceed for approximately 30 minutes and can assume there will be no more changes. 
E) none of the above 
A) there is no longer any net change in the concentrations of products or reactants. 
B) the forward and reverse reactions come to a halt. 
C) the sum of the concentrations of the reactants is equal to the sum of the concentrations of the products. 
D) you have let the reaction proceed for approximately 30 minutes and can assume there will be no more changes. 
E) none of the above

Question 4

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

Accepted Answer

A) 1.77 ×   M 
B) 1.33 ×   M 
C) 8.85 ×   M 
D) 3.54 ×   M 
E) not enough information 
A) 1.77 ×   M 
B) 1.33 ×   M 
C) 8.85 ×   M 
D) 3.54 ×   M 
E) not enough information

Question 5

For the reaction  
what happens to the equilibrium position if the pressure 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

Question 6

Suppose a wall divides a playground,and twenty balls lie on the ground on the east side,while forty balls lie on the west side.If a child on the east side of the wall always tosses a ball over the wall at the same time a child on the west side tosses a ball over the wall,then:

Accepted Answer

A) equilibrium has been established. 
B) all balls will eventually end up on one side. 
C) equilibrium will be established once thirty balls are on each side. 
D) this system can never reach equilibrium. 
E) none of the above 
A) equilibrium has been established. 
B) all balls will eventually end up on one side. 
C) equilibrium will be established once thirty balls are on each side. 
D) this system can never reach equilibrium. 
E) none of the above

Question 7

What happens to the equilibrium position of an exothermic reaction when you add 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 8

Decreasing the amount of carbon dioxide in the reaction below will cause the reaction to proceed to the right so that equilibrium will be restored.

Accepted Answer

A) True 
 B)False

Question 9

What is the   expression for the ionic compound barium phosphate,Ba3(PO4)2?

Accepted Answer

A)    = [Ba2+] 2 [PO43-]3 
B)    = [Ba2+]3 [PO43-]4 
C)    = [Ba2+]3 [PO43-]2 
D)    = [Ba2+] [PO43-] 
E) none of the above 
A)    = [Ba2+] 2 [PO43-]3 
B)    = [Ba2+]3 [PO43-]4 
C)    = [Ba2+]3 [PO43-]2 
D)    = [Ba2+] [PO43-] 
E) none of the above

Question 10

It is not necessary to have a balanced equation before writing an equilibrium constant expression.

Accepted Answer

A) True 
 B)False

Question 11

For the reaction LiOH (s)⇌ Li+ (aq)+ OH- (aq),   = 4.6 ×   ,and the equilibrium concentration for hydroxide ion is [OH-] = 0.042 M.What is [Li+] at equilibrium?

Accepted Answer

A) 0.11 M 
B) 0.0046 M 
C) 0.042 M 
D) An answer cannot be determined without [LiOH] value. 
E) none of the above 
A) 0.11 M 
B) 0.0046 M 
C) 0.042 M 
D) An answer cannot be determined without [LiOH] value. 
E) none of the above

Question 12

Given the choice of adding ions of Mg 2+ (aq),Ca 2+ (aq),Sr 2+ (aq)or Ba 2+ (aq)to a solution of carbonate ions,CO3 2-,which choice would precipitate an insoluble carbonate compound first? Use the following   data:

Accepted Answer

A) Mg 2+  
B) Ca 2+ 
C) Sr 2+ 
D) Ba 2+ 
E) none of these will give a precipitate 
A) Mg 2+  
B) Ca 2+ 
C) Sr 2+ 
D) Ba 2+ 
E) none of these will give a precipitate

Question 13

What is the value for the   for a compound MX2(s)if at equilibrium   and   ?

Accepted Answer

A) 0.011 
B) 1.1 ×   
C) 2.3 ×   
D) 1.7 ×   
E) none of the above 
A) 0.011 
B) 1.1 ×   
C) 2.3 ×   
D) 1.7 ×   
E) none of the above

Question 14

The Equilibrium Constant, Keq ,is a way to quantify the relative concentrations of the reactants and products of a reaction at equilibrium.

Accepted Answer

A) True 
 B)False

Question 15

Consider the reaction: 
 
Which of the following will cause a shift in the equilibrium to the right? 
1.Add more N2O
2.Remove O2
3.Remove 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 16

Le Chatelier's principle states that a chemical system must have a shift in direction in order to force the system to reach equilibrium.

Accepted Answer

A) True 
 B)False

Question 17

Calculate [   ] at equilibrium given that the   for the reaction

Accepted Answer

A) 0.0185 M 
B) 0.0 M 
C) 0.19 M 
D) not enough information given 
E) none of the above 
A) 0.0185 M 
B) 0.0 M 
C) 0.19 M 
D) not enough information given 
E) none of the above

Question 18

Which equilibrium constant represents a reaction that favors the formation of the products to the greatest extent?

Accepted Answer

A)    = 100 
B)    = 1.0 ×   
C)    = 1.0 ×   
D)    = 1.0 ×   
E) not enough information 
A)    = 100 
B)    = 1.0 ×   
C)    = 1.0 ×   
D)    = 1.0 ×   
E) not enough information

Question 19

If you have a chamber of gases at equilibrium,compressing the gases to half the original volume would have the same effect as doubling the pressure.

Accepted Answer

A) True 
 B)False

Question 20

The rate of a chemical reaction is the amount of reactant that changes to product in a specific amount of time.

Accepted Answer

A) True 
 B)False

Living things are in equilibrium with their surroundings.

According to the collision theory of chemical reactions:

A system is said to be in dynamic equilibrium when:

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

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

Suppose a wall divides a playground,and twenty balls lie on the ground on the east side,while forty balls lie on the west side.If a child on the east side of the wall always tosses a ball over the wall at the same time a child on the west side tosses a ball over the wall,then:

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

Decreasing the amount of carbon dioxide in the reaction below will cause the reaction to proceed to the right so that equilibrium will be restored.

What is the expression for the ionic compound barium phosphate,Ba₃(PO₄)₂?

It is not necessary to have a balanced equation before writing an equilibrium constant expression.

For the reaction LiOH (s)⇌ Li⁺ (aq)+ OH^- (aq), = 4.6 × ,and the equilibrium concentration for hydroxide ion is [OH^-] = 0.042 M.What is [Li⁺] at equilibrium?

Given the choice of adding ions of Mg ²⁺ (aq),Ca ²⁺(aq),Sr ²⁺ (aq)or Ba ²⁺ (aq)to a solution of carbonate ions,CO₃ ^2-,which choice would precipitate an insoluble carbonate compound first? Use the following data:

What is the value for the for a compound MX₂(s)if at equilibrium and ?

The Equilibrium Constant, K_eq ,is a way to quantify the relative concentrations of the reactants and products of a reaction at equilibrium.

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

Le Chatelier's principle states that a chemical system must have a shift in direction in order to force the system to reach equilibrium.

Calculate [ ] at equilibrium given that the for the reaction

Which equilibrium constant represents a reaction that favors the formation of the products to the greatest extent?

If you have a chamber of gases at equilibrium,compressing the gases to half the original volume would have the same effect as doubling the pressure.

The rate of a chemical reaction is the amount of reactant that changes to product in a specific amount of time.

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Exam 15: Chemical Equilibrium

Living things are in equilibrium with their surroundings.

According to the collision theory of chemical reactions:

A system is said to be in dynamic equilibrium when:

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

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

Suppose a wall divides a playground,and twenty balls lie on the ground on the east side,while forty balls lie on the west side.If a child on the east side of the wall always tosses a ball over the wall at the same time a child on the west side tosses a ball over the wall,then:

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

Decreasing the amount of carbon dioxide in the reaction below will cause the reaction to proceed to the right so that equilibrium will be restored.

What is the expression for the ionic compound barium phosphate,Ba3(PO4)2?

It is not necessary to have a balanced equation before writing an equilibrium constant expression.

For the reaction LiOH (s)⇌ Li+ (aq)+ OH- (aq), = 4.6 × ,and the equilibrium concentration for hydroxide ion is [OH-] = 0.042 M.What is [Li+] at equilibrium?

Given the choice of adding ions of Mg 2+ (aq),Ca 2+ (aq),Sr 2+ (aq)or Ba 2+ (aq)to a solution of carbonate ions,CO3 2-,which choice would precipitate an insoluble carbonate compound first? Use the following data:

What is the value for the for a compound MX2(s)if at equilibrium and ?

The Equilibrium Constant, Keq ,is a way to quantify the relative concentrations of the reactants and products of a reaction at equilibrium.

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

Le Chatelier's principle states that a chemical system must have a shift in direction in order to force the system to reach equilibrium.

Calculate [ ] at equilibrium given that the for the reaction

Which equilibrium constant represents a reaction that favors the formation of the products to the greatest extent?

If you have a chamber of gases at equilibrium,compressing the gases to half the original volume would have the same effect as doubling the pressure.

The rate of a chemical reaction is the amount of reactant that changes to product in a specific amount of 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

What is the expression for the ionic compound barium phosphate,Ba₃(PO₄)₂?

For the reaction LiOH (s)⇌ Li⁺ (aq)+ OH^- (aq), = 4.6 × ,and the equilibrium concentration for hydroxide ion is [OH^-] = 0.042 M.What is [Li⁺] at equilibrium?

Given the choice of adding ions of Mg ²⁺ (aq),Ca ²⁺(aq),Sr ²⁺ (aq)or Ba ²⁺ (aq)to a solution of carbonate ions,CO₃ ^2-,which choice would precipitate an insoluble carbonate compound first? Use the following data:

What is the value for the for a compound MX₂(s)if at equilibrium and ?

The Equilibrium Constant, K_eq ,is a way to quantify the relative concentrations of the reactants and products of a reaction at equilibrium.

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