Question 1

Write the mass-action expression, Qc, for the following chemical reaction. MgO(s)  + SO2(g)  + ½O2(g)  ⇄ MgSO4(s)

Accepted Answer

A)   c, for the following chemical reaction. MgO(s)  + SO2(g)  + ½O2(g)  ⇄ MgSO4(s)  
A)     
B)     
C)     
D)     
E)  None of these choices are correct." class="answers-bank-image d-inline" rel="preload" >
B)   c, for the following chemical reaction. MgO(s)  + SO2(g)  + ½O2(g)  ⇄ MgSO4(s)  
A)     
B)     
C)     
D)     
E)  None of these choices are correct." class="answers-bank-image d-inline" rel="preload" >
C)   c, for the following chemical reaction. MgO(s)  + SO2(g)  + ½O2(g)  ⇄ MgSO4(s)  
A)     
B)     
C)     
D)     
E)  None of these choices are correct." class="answers-bank-image d-inline" rel="preload" >
D)   c, for the following chemical reaction. MgO(s)  + SO2(g)  + ½O2(g)  ⇄ MgSO4(s)  
A)     
B)     
C)     
D)     
E)  None of these choices are correct." class="answers-bank-image d-inline" rel="preload" >
E)  None of these choices are correct.F) A) and E)
G) B) and D)

Question 2

Hydrogen bromide will dissociate into hydrogen and bromine gases. 2HBr(g)  ⇄ H2(g)  + Br2(g)  ΔH°rxn = 68 kJ
What effect will a temperature increase of 50°C have on this system at equilibrium?

Accepted Answer

A)  The partial pressure of hydrogen bromide will increase.
B)  The partial pressure of hydrogen will increase.
C)  The partial pressure of hydrogen bromide and bromine will increase.
D)  There will be no effect on the partial pressure of any of the gases.
E)  Need to know the initial pressure, volume, and temperature before any of the above predictions can be made.F) B) and E)
G) B) and D)

Question 3

The equilibrium constant, Kp, for the reaction CO(g)  + H2O(g)  ⇄ CO2(g)  + H2(g) 
At 986°C is 0.63. A rigid cylinder at that temperature contains 1.2 atm of carbon monoxide, 0.20 atm of water vapor, 0.30 atm of carbon dioxide, and 0.27 atm of hydrogen. Is the system at equilibrium?

Accepted Answer

A)  Yes.
B)  No, the forward reaction must proceed to establish equilibrium.
C)  No, the reverse reaction must proceed to establish equilibrium.
D)  Need to know the volume of the container before deciding.
E)  Need to know the starting concentrations of all substances before deciding.F) D) and E)
G) C) and D)

Question 4

Nitrogen dioxide can dissociate to nitric oxide and oxygen. 2NO2(g)  ⇄ 2NO(g)  + O2(g)  ΔH°rxn = +114 kJ
Under which reaction conditions would you expect to produce the largest amount of oxygen?

Accepted Answer

A)  High temperature, high pressure
B)  Low temperature, high pressure
C)  High temperature, low pressure
D)  Low temperature, low pressure
E)  None of these choices are correct.F) C) and E)
G) A) and C)

Question 5

In a chemical reaction, if the starting concentrations of reactants are increased, then the equilibrium constant Kc will also increase.

Accepted Answer

A) True 
 B)False

Question 6

What is the mass-action expression, Qc, for the following chemical reaction? Cu2+(aq)  + 4NH3(aq)  ⇄ Cu(NH3) 42+(aq)

Accepted Answer

A)   c, for the following chemical reaction? Cu2+(aq)  + 4NH3(aq)  ⇄ Cu(NH3) 42+(aq)  
A)     
B)     
C)     
D)     
E)  None of these choices are correct." class="answers-bank-image d-inline" rel="preload" >
B)   c, for the following chemical reaction? Cu2+(aq)  + 4NH3(aq)  ⇄ Cu(NH3) 42+(aq)  
A)     
B)     
C)     
D)     
E)  None of these choices are correct." class="answers-bank-image d-inline" rel="preload" >
C)   c, for the following chemical reaction? Cu2+(aq)  + 4NH3(aq)  ⇄ Cu(NH3) 42+(aq)  
A)     
B)     
C)     
D)     
E)  None of these choices are correct." class="answers-bank-image d-inline" rel="preload" >
D)   c, for the following chemical reaction? Cu2+(aq)  + 4NH3(aq)  ⇄ Cu(NH3) 42+(aq)  
A)     
B)     
C)     
D)     
E)  None of these choices are correct." class="answers-bank-image d-inline" rel="preload" >
E)  None of these choices are correct.F) C) and E)
G) None of the above

Question 7

In order to write the correct mass-action expression for a reaction one must

Accepted Answer

A)  know the kinetic rate law for the reaction.
B)  know the mechanism for the reaction.
C)  have a properly balanced chemical equation.
D)  have values for the concentrations of the reactants.
E)  know the limiting reactant.F) A) and B)
G) A) and E)

Question 8

The reaction of nitrogen with oxygen to form nitrogen monoxide can be represented by the following equation. N2(g)  + O2(g)  ⇄ 2NO(g) 
At 2000°C, the equilibrium constant, Kc, has a value of 4.10 × 10−4. What is the value of Kp?

Accepted Answer

A)  2.17 × 10 −8
B)  4.10 × 10 −4
C)  7.65 × 10 −2
D)  7.75
E)  None of these choices are correct.F) None of the above
G) A) and C)

Question 9

Nitrogen dioxide decomposes according to the reaction 2NO2(g)  ⇄ 2NO(g)  + O2(g) 
Where Kp = 4.48 × 10−13 at 25°C. What is the value for Kc?

Accepted Answer

A)  1.81 × 10 −16
B)  1.83 × 10 −14
C)  4.48 × 10 −13
D)  1.10 × 10 −11
E)  1.11 × 10 −9F) A) and E)
G) B) and D)

Question 10

An equilibrium is established in which both the forward (fwd)  and the reverse (rev)  reactions are elementary. If the equilibrium constant Kc = 1.6 × 10−2 and the rate constant kfwd = 8.0 × 10−7 s−1 what is the value of krev?

Accepted Answer

A)  1.3 × 10 −8 s −1
B)  7.8 × 10 7 s −1
C)  2 × 10 4 s −1
D)  5.0 × 10 −5 s −1
E)  None of these choices are correct.F) A) and B)
G) B) and E)

Question 11

If Q > K, more products need to be formed as the reaction proceeds to equilibrium.

Accepted Answer

A) True 
 B)False

Question 12

At 25°C, the equilibrium constant Kc for the reaction 2A(g)  ⇄ B(g)  + C(g) 
Is 0.035. A mixture of 8.00 moles of B and 12.00 moles of C in a 20.0 L container is allowed to come to equilibrium. What is the equilibrium concentration of A?

Accepted Answer

A)  
B)  0.339 M
C)  0.678 M
D)  6.78 M
E)  13.56 MF) C) and D)
G) A) and C)

Question 13

Write the mass-action expression, Qc, for the following chemical reaction. 2Cu2+(aq)  + 4I−(aq)  ⇄ 2CuI(s)  + I2(aq)

Accepted Answer

A)   c, for the following chemical reaction. 2Cu2+(aq)  + 4I−(aq)  ⇄ 2CuI(s)  + I2(aq)  
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
B)   c, for the following chemical reaction. 2Cu2+(aq)  + 4I−(aq)  ⇄ 2CuI(s)  + I2(aq)  
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
C)   c, for the following chemical reaction. 2Cu2+(aq)  + 4I−(aq)  ⇄ 2CuI(s)  + I2(aq)  
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
D)   c, for the following chemical reaction. 2Cu2+(aq)  + 4I−(aq)  ⇄ 2CuI(s)  + I2(aq)  
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
E)   c, for the following chemical reaction. 2Cu2+(aq)  + 4I−(aq)  ⇄ 2CuI(s)  + I2(aq)  
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >F) A) and C)
G) A) and E)

Question 14

The following reaction is at equilibrium at one atmosphere, in a closed container. NaOH(s)  + CO2(g)  ⇄ NaHCO3(s) 
Which, if any, of the following actions will decrease the total amount of CO2 gas present at equilibrium?

Accepted Answer

A)  Adding N 2 gas to double the pressure
B)  Adding more solid NaOH
C)  Decreasing the volume of the container
D)  Removing half of the solid NaHCO 3
E)  None of these choices are correct.F) B) and E)
G) C) and D)

Question 15

Sodium hydrogen carbonate decomposes above 110°C to form sodium carbonate, water, and carbon dioxide. 2NaHCO3(s)  ⇄ Na2CO3(s)  + H2O(g)  + CO2(g) 
One thousand grams of sodium hydrogen carbonate are added to a reaction vessel, the temperature is increased to 200°C, and the system comes to equilibrium. What happens in this system if another 50 g of sodium carbonate are now added?

Accepted Answer

A)  The partial pressure of carbon dioxide will increase.
B)  The partial pressure of carbon dioxide will decrease.
C)  The partial pressure of carbon dioxide will be unchanged.
D)  The amounts of all products will be greater when equilibrium is reestablished.
E)  None of these choices are correct.F) A) and B)
G) A) and C)

Question 16

What is the mass-action expression, Qp, for the following reaction? SbF5(g)  + 4Cl2(g)  ⇄ SbCl3(g)  + 5ClF(g)

Accepted Answer

A)   p, for the following reaction? SbF5(g)  + 4Cl2(g)  ⇄ SbCl3(g)  + 5ClF(g)  
A)     
B)     
C)     
D)     
E)  None of these choices are correct." class="answers-bank-image d-inline" rel="preload" >
B)   p, for the following reaction? SbF5(g)  + 4Cl2(g)  ⇄ SbCl3(g)  + 5ClF(g)  
A)     
B)     
C)     
D)     
E)  None of these choices are correct." class="answers-bank-image d-inline" rel="preload" >
C)   p, for the following reaction? SbF5(g)  + 4Cl2(g)  ⇄ SbCl3(g)  + 5ClF(g)  
A)     
B)     
C)     
D)     
E)  None of these choices are correct." class="answers-bank-image d-inline" rel="preload" >
D)   p, for the following reaction? SbF5(g)  + 4Cl2(g)  ⇄ SbCl3(g)  + 5ClF(g)  
A)     
B)     
C)     
D)     
E)  None of these choices are correct." class="answers-bank-image d-inline" rel="preload" >
E)  None of these choices are correct.F) D) and E)
G) A) and B)

Question 17

A chemical reaction will reach equilibrium when the limiting reactant is used up.

Accepted Answer

A) True 
 B)False

Question 18

Which of the following has an effect on the magnitude of the equilibrium constant?

Accepted Answer

A)  Removing products as they are formed
B)  Adding more of a reactant
C)  Adding a catalyst
D)  Increasing the pressure, in a gas-phase reaction
E)  Change in temperatureF) All of the above
G) B) and D)

Exam 17: Equilibrium: the Extent of Chemical Reactions

The reaction of nitrogen with oxygen to form nitrogen monoxide can be represented by the following equation. N₂(g) + O₂(g) ⇄ 2NO(g) At 2000°C, the equilibrium constant, K_c, has a value of 4.10 × 10⁻⁴. What is the value of K_p?

Correct Answer
verified

Hydrogen bromide will dissociate into hydrogen and bromine gases. 2HBr(g) ⇄ H₂(g) + Br₂(g) ΔH°_rxn = 68 kJ What effect will a temperature increase of 50°C have on this system at equilibrium?

Correct Answer
verified

A chemical reaction will reach equilibrium when the limiting reactant is used up.

Correct Answer
verified

An equilibrium is established in which both the forward (fwd) and the reverse (rev) reactions are elementary. If the equilibrium constant K_c = 1.6 × 10⁻² and the rate constant k_fwd = 8.0 × 10⁻⁷s⁻¹what is the value of k_rev?

Correct Answer
verified

Which of the following has an effect on the magnitude of the equilibrium constant?

Correct Answer
verified

What is the mass-action expression, Q_p, for the following reaction? SbF₅(g) + 4Cl₂(g) ⇄ SbCl₃(g) + 5ClF(g)

Correct Answer
verified

The equilibrium constant, K_p, for the reaction CO(g) + H₂O(g) ⇄ CO₂(g) + H₂(g) At 986°C is 0.63. A rigid cylinder at that temperature contains 1.2 atm of carbon monoxide, 0.20 atm of water vapor, 0.30 atm of carbon dioxide, and 0.27 atm of hydrogen. Is the system at equilibrium?

Correct Answer
verified

In a chemical reaction, if the starting concentrations of reactants are increased, then the equilibrium constant K_c will also increase.

Correct Answer
verified

Correct Answer
verified

In order to write the correct mass-action expression for a reaction one must

Correct Answer
verified

What is the mass-action expression, Q_c, for the following chemical reaction? Cu²⁺(aq) + 4NH₃(aq) ⇄ Cu(NH₃) ₄²⁺(aq)

Correct Answer
verified

If Q > K, more products need to be formed as the reaction proceeds to equilibrium.

Correct Answer
verified

Write the mass-action expression, Q_c, for the following chemical reaction. MgO(s) + SO₂(g) + ½O₂(g) ⇄ MgSO₄(s)

Correct Answer
verified

Nitrogen dioxide decomposes according to the reaction 2NO₂(g) ⇄ 2NO(g) + O₂(g) Where K_p = 4.48 × 10⁻¹³ at 25°C. What is the value for K_c?

Correct Answer
verified

Write the mass-action expression, Q_c, for the following chemical reaction. 2Cu²⁺(aq) + 4I⁻(aq) ⇄ 2CuI(s) + I₂(aq)

Correct Answer
verified

At 25°C, the equilibrium constant K_c for the reaction 2A(g) ⇄ B(g) + C(g) Is 0.035. A mixture of 8.00 moles of B and 12.00 moles of C in a 20.0 L container is allowed to come to equilibrium. What is the equilibrium concentration of A?

Correct Answer
verified

The following reaction is at equilibrium at one atmosphere, in a closed container. NaOH(s) + CO₂(g) ⇄ NaHCO₃(s) Which, if any, of the following actions will decrease the total amount of CO₂ gas present at equilibrium?

Correct Answer
verified

Nitrogen dioxide can dissociate to nitric oxide and oxygen. 2NO₂(g) ⇄ 2NO(g) + O₂(g) ΔH°_rxn = +114 kJ Under which reaction conditions would you expect to produce the largest amount of oxygen?

Correct Answer
verified

Exam 17: Equilibrium: the Extent of Chemical Reactions

The reaction of nitrogen with oxygen to form nitrogen monoxide can be represented by the following equation. N2(g) + O2(g) ⇄ 2NO(g) At 2000°C, the equilibrium constant, Kc, has a value of 4.10 × 10−4. What is the value of Kp?

Correct AnswerverifiedShow Answer

Hydrogen bromide will dissociate into hydrogen and bromine gases. 2HBr(g) ⇄ H2(g) + Br2(g) ΔH°rxn = 68 kJ What effect will a temperature increase of 50°C have on this system at equilibrium?

Correct AnswerverifiedShow Answer

A chemical reaction will reach equilibrium when the limiting reactant is used up.

Correct AnswerverifiedShow Answer

An equilibrium is established in which both the forward (fwd) and the reverse (rev) reactions are elementary. If the equilibrium constant Kc = 1.6 × 10−2 and the rate constant kfwd = 8.0 × 10−7 s−1 what is the value of krev?

Correct AnswerverifiedShow Answer

Which of the following has an effect on the magnitude of the equilibrium constant?

Correct AnswerverifiedShow Answer

What is the mass-action expression, Qp, for the following reaction? SbF5(g) + 4Cl2(g) ⇄ SbCl3(g) + 5ClF(g)

Correct AnswerverifiedShow Answer

The equilibrium constant, Kp, for the reaction CO(g) + H2O(g) ⇄ CO2(g) + H2(g) At 986°C is 0.63. A rigid cylinder at that temperature contains 1.2 atm of carbon monoxide, 0.20 atm of water vapor, 0.30 atm of carbon dioxide, and 0.27 atm of hydrogen. Is the system at equilibrium?

Correct AnswerverifiedShow Answer

In a chemical reaction, if the starting concentrations of reactants are increased, then the equilibrium constant Kc will also increase.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

In order to write the correct mass-action expression for a reaction one must

Correct AnswerverifiedShow Answer

What is the mass-action expression, Qc, for the following chemical reaction? Cu2+(aq) + 4NH3(aq) ⇄ Cu(NH3) 42+(aq)

Correct AnswerverifiedShow Answer

If Q > K, more products need to be formed as the reaction proceeds to equilibrium.

Correct AnswerverifiedShow Answer

Write the mass-action expression, Qc, for the following chemical reaction. MgO(s) + SO2(g) + ½O2(g) ⇄ MgSO4(s)

Correct AnswerverifiedShow Answer

Nitrogen dioxide decomposes according to the reaction 2NO2(g) ⇄ 2NO(g) + O2(g) Where Kp = 4.48 × 10−13 at 25°C. What is the value for Kc?

Correct AnswerverifiedShow Answer

Write the mass-action expression, Qc, for the following chemical reaction. 2Cu2+(aq) + 4I−(aq) ⇄ 2CuI(s) + I2(aq)

Correct AnswerverifiedShow Answer

At 25°C, the equilibrium constant Kc for the reaction 2A(g) ⇄ B(g) + C(g) Is 0.035. A mixture of 8.00 moles of B and 12.00 moles of C in a 20.0 L container is allowed to come to equilibrium. What is the equilibrium concentration of A?

Correct AnswerverifiedShow Answer

The following reaction is at equilibrium at one atmosphere, in a closed container. NaOH(s) + CO2(g) ⇄ NaHCO3(s) Which, if any, of the following actions will decrease the total amount of CO2 gas present at equilibrium?

Correct AnswerverifiedShow Answer

Nitrogen dioxide can dissociate to nitric oxide and oxygen. 2NO2(g) ⇄ 2NO(g) + O2(g) ΔH°rxn = +114 kJ Under which reaction conditions would you expect to produce the largest amount of oxygen?

Correct AnswerverifiedShow Answer

The reaction of nitrogen with oxygen to form nitrogen monoxide can be represented by the following equation. N₂(g) + O₂(g) ⇄ 2NO(g) At 2000°C, the equilibrium constant, K_c, has a value of 4.10 × 10⁻⁴. What is the value of K_p?

Correct Answer
verified

Hydrogen bromide will dissociate into hydrogen and bromine gases. 2HBr(g) ⇄ H₂(g) + Br₂(g) ΔH°_rxn = 68 kJ What effect will a temperature increase of 50°C have on this system at equilibrium?

Correct Answer
verified

Correct Answer
verified

An equilibrium is established in which both the forward (fwd) and the reverse (rev) reactions are elementary. If the equilibrium constant K_c = 1.6 × 10⁻² and the rate constant k_fwd = 8.0 × 10⁻⁷s⁻¹what is the value of k_rev?

Correct Answer
verified

Correct Answer
verified

What is the mass-action expression, Q_p, for the following reaction? SbF₅(g) + 4Cl₂(g) ⇄ SbCl₃(g) + 5ClF(g)

Correct Answer
verified

The equilibrium constant, K_p, for the reaction CO(g) + H₂O(g) ⇄ CO₂(g) + H₂(g) At 986°C is 0.63. A rigid cylinder at that temperature contains 1.2 atm of carbon monoxide, 0.20 atm of water vapor, 0.30 atm of carbon dioxide, and 0.27 atm of hydrogen. Is the system at equilibrium?

Correct Answer
verified

In a chemical reaction, if the starting concentrations of reactants are increased, then the equilibrium constant K_c will also increase.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

What is the mass-action expression, Q_c, for the following chemical reaction? Cu²⁺(aq) + 4NH₃(aq) ⇄ Cu(NH₃) ₄²⁺(aq)

Correct Answer
verified

Correct Answer
verified

Write the mass-action expression, Q_c, for the following chemical reaction. MgO(s) + SO₂(g) + ½O₂(g) ⇄ MgSO₄(s)

Correct Answer
verified

Nitrogen dioxide decomposes according to the reaction 2NO₂(g) ⇄ 2NO(g) + O₂(g) Where K_p = 4.48 × 10⁻¹³ at 25°C. What is the value for K_c?

Correct Answer
verified

Write the mass-action expression, Q_c, for the following chemical reaction. 2Cu²⁺(aq) + 4I⁻(aq) ⇄ 2CuI(s) + I₂(aq)

Correct Answer
verified

At 25°C, the equilibrium constant K_c for the reaction 2A(g) ⇄ B(g) + C(g) Is 0.035. A mixture of 8.00 moles of B and 12.00 moles of C in a 20.0 L container is allowed to come to equilibrium. What is the equilibrium concentration of A?

Correct Answer
verified

The following reaction is at equilibrium at one atmosphere, in a closed container. NaOH(s) + CO₂(g) ⇄ NaHCO₃(s) Which, if any, of the following actions will decrease the total amount of CO₂ gas present at equilibrium?

Correct Answer
verified

Nitrogen dioxide can dissociate to nitric oxide and oxygen. 2NO₂(g) ⇄ 2NO(g) + O₂(g) ΔH°_rxn = +114 kJ Under which reaction conditions would you expect to produce the largest amount of oxygen?

Correct Answer
verified