Question 1

For the reaction     ⇌ 2S   +   ,the equilibrium expression is:

Accepted Answer

A)    =   
B)    =   
C)    =   
D)    =   
E) none of the above 
A)    =   
B)    =   
C)    =   
D)    =   
E) none of the above

Question 2

If an equilibrium reaction shifts to the right when the system is cooled,this indicates that the reaction is endothermic.

Accepted Answer

A) True 
 B)False

Question 3

When writing the expression for an equilibrium constant,which type of substance IS included?

Accepted Answer

A) solids 
B) pure liquids 
C) gases 
D) all of the above 
E) none of these 
A) solids 
B) pure liquids 
C) gases 
D) all of the above 
E) none of these

Question 4

Calculate the equilibrium constant for the reaction below given that     and   at equilibrium. 
Given: Cl2(g)+ H2(g)⇌ 2HCl(g)

Accepted Answer

A) 0.017 
B) 0.018 
C) 58 
D) 55 
E) none of the above 
A) 0.017 
B) 0.018 
C) 58 
D) 55 
E) none of the above

Question 5

What happens to the equilibrium position of an endothermic 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 6

For the reaction aA + bB ⇌ cC + dD,the equilibrium expression is:

Accepted Answer

A)    =   
B)    =   
C)    =   
D)    =   
E) none of the above 
A)    =   
B)    =   
C)    =   
D)    =   
E) none of the above

Question 7

Calculate the equilibrium constant (Keq)for the reaction 1A (aq)+ 1B (aq)⇌ 2C (aq)
given that     and   at equilibrium.

Accepted Answer

A) 9.9 
B) 0.40 
C) 2.5 
D) 20. 
E) none of the above 
A) 9.9 
B) 0.40 
C) 2.5 
D) 20. 
E) none of the above

Question 8

Which statement about activation energy is FALSE?

Accepted Answer

A) Activation energy is an energy hump that normally exists between reactants and products. 
B) The higher the activation energy,the slower the reaction rate. 
C) The lower the activation energy,the faster the reaction rate. 
D) Increasing the temperature lowers the activation energy. 
E) All of the above are true. 
A) Activation energy is an energy hump that normally exists between reactants and products. 
B) The higher the activation energy,the slower the reaction rate. 
C) The lower the activation energy,the faster the reaction rate. 
D) Increasing the temperature lowers the activation energy. 
E) All of the above are true.

Question 9

The larger the equilibrium constant,the greater is the concentration of reactants relative to products at equilibrium.

Accepted Answer

A) True 
 B)False

Question 10

For the reaction Cu2 S(s)⇌ 2   (aq)+ S2- (aq),the equilibrium expression is:

Accepted Answer

A)    =   
B)    =   
C)    = [   ]2[   ] 
D)    = [   S] 
E) none of the above 
A)    =   
B)    =   
C)    = [   ]2[   ] 
D)    = [   S] 
E) none of the above

Question 11

For the reaction 2 H2O (l)⇌ 2H2 (g)+ O2 (g),the equilibrium expression is:

Accepted Answer

A)    = [H2O]2 
B)    = [H2]2 [O2] 
C)    =   
D)    =   
E) none of the above 
A)    = [H2O]2 
B)    = [H2]2 [O2] 
C)    =   
D)    =   
E) none of the above

Question 12

A reaction that has KS1U1B1eq S1U1B0= 2.0 × 10S1U1P18S1S1P0 will have high concentrations of products.

Accepted Answer

A) True 
 B)False

Question 13

For the reaction  ,what happens to the equilibrium position if the amount of solid silver sulfide is doubled?

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 14

A large equilibrium constant Keq indicates that the forward reaction is largely favored.

Accepted Answer

A) True 
 B)False

Question 15

What is the   expression for the ionic compound Li2CO3?

Accepted Answer

A)    = [Li+] [CO32-] 
B)    = [Li+]2 [CO32-] 
C)    = 2[Li+] [CO32-] 
D)    = [Li2CO3]3 
E) none of the above 
A)    = [Li+] [CO32-] 
B)    = [Li+]2 [CO32-] 
C)    = 2[Li+] [CO32-] 
D)    = [Li2CO3]3 
E) none of the above

Question 16

The effect of a catalyst is to:

Accepted Answer

A) increase the number of collisions between reactants. 
B) increase the temperature of the reactants whereby more products are formed. 
C) change the position of the equilibrium. 
D) change the stoichiometry of the reaction. 
E) lower the activation energy of a reaction whereby making it easier for the reactants to get over the energy hump. 
A) increase the number of collisions between reactants. 
B) increase the temperature of the reactants whereby more products are formed. 
C) change the position of the equilibrium. 
D) change the stoichiometry of the reaction. 
E) lower the activation energy of a reaction whereby making it easier for the reactants to get over the energy hump.

Question 17

When dynamic equilibrium is achieved,the rates of the forward and backward reactions go to zero.

Accepted Answer

A) True 
 B)False

Question 18

If   equals about ≈1,then neither direction is favored and significant amounts of both reactants and products are present at equilibrium.

Accepted Answer

A) True 
 B)False

For the reaction ⇌ 2S + ,the equilibrium expression is:

If an equilibrium reaction shifts to the right when the system is cooled,this indicates that the reaction is endothermic.

When writing the expression for an equilibrium constant,which type of substance IS included?

Calculate the equilibrium constant for the reaction below given that and at equilibrium. Given: Cl₂(g)+ H₂(g)⇌ 2HCl(g)

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

For the reaction aA + bB ⇌ cC + dD,the equilibrium expression is:

Calculate the equilibrium constant (Keq)for the reaction 1A (aq)+ 1B (aq)⇌ 2C (aq) given that and at equilibrium.

Which statement about activation energy is FALSE?

The larger the equilibrium constant,the greater is the concentration of reactants relative to products at equilibrium.

For the reaction Cu₂ S(s)⇌ 2 (aq)+ S^2- (aq),the equilibrium expression is:

For the reaction 2 H₂O (l)⇌ 2H₂ (g)+ O₂ (g),the equilibrium expression is:

A reaction that has K_eq= 2.0 × 10⁸ will have high concentrations of products.

For the reaction ,what happens to the equilibrium position if the amount of solid silver sulfide is doubled?

A large equilibrium constant K_eq indicates that the forward reaction is largely favored.

What is the expression for the ionic compound Li₂CO₃?

The effect of a catalyst is to:

When dynamic equilibrium is achieved,the rates of the forward and backward reactions go to zero.

If equals about ≈1,then neither direction is favored and significant amounts of both reactants and products are present at equilibrium.

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

Exam 15: Chemical Equilibrium

For the reaction ⇌ 2S + ,the equilibrium expression is:

If an equilibrium reaction shifts to the right when the system is cooled,this indicates that the reaction is endothermic.

When writing the expression for an equilibrium constant,which type of substance IS included?

Calculate the equilibrium constant for the reaction below given that and at equilibrium. Given: Cl2(g)+ H2(g)⇌ 2HCl(g)

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

For the reaction aA + bB ⇌ cC + dD,the equilibrium expression is:

Calculate the equilibrium constant (Keq)for the reaction 1A (aq)+ 1B (aq)⇌ 2C (aq) given that and at equilibrium.

Which statement about activation energy is FALSE?

The larger the equilibrium constant,the greater is the concentration of reactants relative to products at equilibrium.

For the reaction Cu2 S(s)⇌ 2 (aq)+ S2- (aq),the equilibrium expression is:

For the reaction 2 H2O (l)⇌ 2H2 (g)+ O2 (g),the equilibrium expression is:

A reaction that has Keq = 2.0 × 108 will have high concentrations of products.

For the reaction ,what happens to the equilibrium position if the amount of solid silver sulfide is doubled?

A large equilibrium constant Keq indicates that the forward reaction is largely favored.

What is the expression for the ionic compound Li2CO3?

The effect of a catalyst is to:

When dynamic equilibrium is achieved,the rates of the forward and backward reactions go to zero.

If equals about ≈1,then neither direction is favored and significant amounts of both reactants and products are present at equilibrium.

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

Calculate the equilibrium constant for the reaction below given that and at equilibrium. Given: Cl₂(g)+ H₂(g)⇌ 2HCl(g)

For the reaction Cu₂ S(s)⇌ 2 (aq)+ S^2- (aq),the equilibrium expression is:

For the reaction 2 H₂O (l)⇌ 2H₂ (g)+ O₂ (g),the equilibrium expression is:

A reaction that has K_eq= 2.0 × 10⁸ will have high concentrations of products.

A large equilibrium constant K_eq indicates that the forward reaction is largely favored.

What is the expression for the ionic compound Li₂CO₃?