Question 1

Phosphorus pentachloride decomposes to phosphorus trichloride at high temperatures according to the reaction:
PCl5(g) ⇌ PCl3(g) + Cl2(g) 
At 250°C,0.250 M PCl5 is added to a flask.If Kc = 1.80,what are the equilibrium concentrations of each gas?

Accepted Answer

A)  [PCl5] = 0.0280 M,[PCl3] = 0.222 M,[Cl2] = 0.222 M
B)  [PCl5] = 1.25 M,[PCl3] = 0.474 M,[Cl2] = 0.474 M
C)  [PCl5] = 1.80 M,[PCl3] = 1.80 M,[Cl2] = 1.80 M
D)  [PCl5] = 2.27 M,[PCl3] = 2.02 M,[Cl2] = 2.02 ME) C) and D)
F) A) and B)

Question 2

The pink and blue species below form a violet colored mixture at equilibrium:
[Co(H2O) 6]2+ (aq) + 4 Cl- (aq) ⇌ [CoCl4]2- (aq) + 6 H2O (l) 
(pink) (blue) 
If the concentration of [Co(H2O) 6]2+ is increased,what happens to the solution?

Accepted Answer

A)  The concentration of [CoCl4]2- increases.
B)  The concentration of [CoCl4]2- decreases.
C)  The solution becomes colorless.
D)  No color change is observed.E) A) and D)
F) None of the above

Question 3

A reaction in which reactants form products in the forward reaction and products simultaneously form reactants in the reverse reaction is said to be ________.

Accepted Answer

The answer of A reaction in which reactants form products...

Question 4

Write the equilibrium equation for the reverse reaction:
2 CH4 (g) + 3 O2 (g) ⇌ 2 CO (g) + 4 H2O (g)

Accepted Answer

A)  Kc´ = 4 (g) + 3 O2 (g) ⇌ 2 CO (g) + 4 H2O (g)  
A)  Kc´ =   
B)  Kc´ =   
C)  Kc´ =   
D)  Kc´ =  " class="answers-bank-image d-inline" rel="preload" >
B)  Kc´ = 4 (g) + 3 O2 (g) ⇌ 2 CO (g) + 4 H2O (g)  
A)  Kc´ =   
B)  Kc´ =   
C)  Kc´ =   
D)  Kc´ =  " class="answers-bank-image d-inline" rel="preload" >
C)  Kc´ = 4 (g) + 3 O2 (g) ⇌ 2 CO (g) + 4 H2O (g)  
A)  Kc´ =   
B)  Kc´ =   
C)  Kc´ =   
D)  Kc´ =  " class="answers-bank-image d-inline" rel="preload" >
D)  Kc´ = 4 (g) + 3 O2 (g) ⇌ 2 CO (g) + 4 H2O (g)  
A)  Kc´ =   
B)  Kc´ =   
C)  Kc´ =   
D)  Kc´ =  " class="answers-bank-image d-inline" rel="preload" >E) A) and D)
F) A) and B)

Question 5

Write the equilibrium equation for the reverse reaction:
2 CH4(g) + 3 O2(g) ⇌ 2 CO(g) + 4 H2O(g)

Accepted Answer

A)  Kp' = 4(g) + 3 O2(g) ⇌ 2 CO(g) + 4 H2O(g)  
A)  Kp' =   
B)  Kp' =   
C)  Kp' =   
D)  Kp' =  " class="answers-bank-image d-inline" rel="preload" >
B)  Kp' = 4(g) + 3 O2(g) ⇌ 2 CO(g) + 4 H2O(g)  
A)  Kp' =   
B)  Kp' =   
C)  Kp' =   
D)  Kp' =  " class="answers-bank-image d-inline" rel="preload" >
C)  Kp' = 4(g) + 3 O2(g) ⇌ 2 CO(g) + 4 H2O(g)  
A)  Kp' =   
B)  Kp' =   
C)  Kp' =   
D)  Kp' =  " class="answers-bank-image d-inline" rel="preload" >
D)  Kp' = 4(g) + 3 O2(g) ⇌ 2 CO(g) + 4 H2O(g)  
A)  Kp' =   
B)  Kp' =   
C)  Kp' =   
D)  Kp' =  " class="answers-bank-image d-inline" rel="preload" >E) None of the above
F) B) and D)

Question 6

The reaction CaCO3(s)⇌ CaO(s)+ O2(g)is endothermic 298 K.The effect of adding additional CaO to the system at equilibrium will ________ (decrease,increase,have no effect on)the total quantity of CaCO3 once equilibrium is reestablished.

Accepted Answer

Question 7

Which statement is true for a reaction with Kc equal to 2.43 × 10-12?

Accepted Answer

A)  Increasing the temperature will not change the value of Kc.
B)  There are appreciable concentrations of both reactants and products.
C)  The reaction proceeds hardly at all towards completion.
D)  The reaction proceeds nearly all the way to completion.E) A) and C)
F) A) and D)

Question 8

For the reaction shown below the value of Kp is ________ than the value of Kc,because Δn = ________.
N2O4(g)⇌ 2 NO2(g)

Accepted Answer

Question 9

A reaction reaches dynamic equilibrium at a given temperature when

Accepted Answer

A)  the amount of products exceeds the amount of reactants.
B)  kfwd equals krev.
C)  opposing reactions cease and the system is static.
D)  the relative amounts of reactants and products are constant and ratefwd = raterev.E) C) and D)
F) All of the above

Question 10

At a certain temperature,Kc equals 1.4 × 102 for the reaction:
2 CO(g) + O2(g) ⇌ 2 CO2(g) .
If a 2.50-L flask contains 0.400 mol of CO2 and 0.100 mol of O2 at equilibrium,how many moles of CO are also present in the flask?

Accepted Answer

A)  0) 422 mol
B)  0) 169 mol
C)  0) 107 mol
D)  0) 0114 molE) B) and C)
F) A) and B)

Question 11

If Kc = 2.0 x 1033 at 25°C,for the following reaction: H2(g) + Cl2(g) ⇌ 2 HCl(g) ,then find Kp at the same temperature.

Accepted Answer

A)  8) 2 × 1031
B)  9) 7 × 1032
C)  2) 0 × 1033
D)  4) 9 × 1034E) A) and B)
F) None of the above

Question 12

The reaction CaCO3(s)⇌ CaO(s)+ O2(g)is endothermic 298 K.The effect of increasing the temperature of the system at equilibrium will ________ (decrease,increase,have no effect on)the total quantity of CaCO3 once equilibrium is reestablished.

Accepted Answer

Question 13

Which equilibrium below is homogeneous?

Accepted Answer

A)  BaSO4(s) ⇌ Ba2+(aq) + SO42-(aq) 
B)  2 H2O2(l) ⇌ 2 H2O(l) + O2(g) 
C)  NH4NO3(s) ⇌ N2O(g) + 2 H2O(g) 
D)  2 CO(g) + O2(g) ⇌ 2 CO2(g) E) A) and B)
F) A) and C)

Question 14

The following pictures represent the initial state and the equilibrium state for the gaseous state reaction of A2 molecules (shaded spheres) with B atoms (unshaded spheres) to give AB molecules. 2 molecules (shaded spheres) with B atoms (unshaded spheres) to give AB molecules.   -If the volume of the equilibrium mixture is decreased,what will happen to the number of AB molecules and the number of B atoms? A) The number of AB molecules and the number of B atoms will both decrease. B) The number of AB molecules will increase;the number of B atoms will decrease. C) The number of AB molecules will decrease;the number of B atoms will increase. D) The number of AB molecules and the number of B atoms will both increase." class="answers-bank-image d-inline" rel="preload" >
-If the volume of the equilibrium mixture is decreased,what will happen to the number of AB molecules and the number of B atoms?

Accepted Answer

A)  The number of AB molecules and the number of B atoms will both decrease.
B)  The number of AB molecules will increase;the number of B atoms will decrease.
C)  The number of AB molecules will decrease;the number of B atoms will increase.
D)  The number of AB molecules and the number of B atoms will both increase.E) All of the above
F) None of the above

Question 15

Kc is 1.67 × 1020 at 25°C for the formation of iron(III) oxalate complex ion:
Fe3+(aq) + 3 C2O42-(aq) ⇌ [Fe(C2O4) 3]3-(aq) .
If 0.0200 M Fe3+ is initially mixed with 1.00 M oxalate ion,what is the concentration of Fe3+ ion at equilibrium?

Accepted Answer

A)  1) 44 × 10-22 M
B)  0) 0100 M
C)  8) 35 × 1019 M
D)  6) 94 × 1021 ME) A) and D)
F) B) and C)

Question 16

If Kc is the equilibrium constant for a forward reaction,2 A⇌ B,what is Kc´ for the reaction 4 A⇌ 2B?

Accepted Answer

A)   c is the equilibrium constant for a forward reaction,2 A⇌ B,what is Kc´ for the reaction 4 A⇌ 2B? 
A)     Kc 
B)  Kc 
C)  2 Kc 
D)  (Kc) 2" class="answers-bank-image d-inline" rel="preload" > Kc
B)  Kc
C)  2 Kc
D)  (Kc) 2E) B) and C)
F) B) and D)

Question 17

For the reaction shown below,N2O4 and NO2 have equilibrium concentrations,[N2O4]eq = 2.160 × 10-4 and [NO2]eq = 1.001 × 10-3,respectively.The equilibrium constant,Kc,for this reaction equals ________.
N2O4(g)⇌ 2 NO2(g)

Accepted Answer

Question 18

The equilibrium constant Kc for the reaction HF(aq) + H2O(l) ⇌ H3O+(aq) +F-(aq) is 3.5 × 10-4.What is the equilibrium concentration of H3O+ if the initial concentration of HF is 1.0 M?

Accepted Answer

A)  1) 0 M
B)  3) 5 × 10-2 M
C)  1) 9 × 10-2 M
D)  1) 9 × 10-4 ME) B) and D)
F) B) and C)

Question 19

The following pictures represent the equilibrium state for four different reactions of the type
A2 + X2 ⇌ 2 AX (X = B,C,D,E) .A atoms are unshaded.X atoms are shaded. 2 + X2 ⇌ 2 AX (X = B,C,D,E) .A atoms are unshaded.X atoms are shaded.   -Which reaction has the smallest equilibrium constant? A) A2 + B2 ⇌ 2 AB B) A2 + C2 ⇌ 2 AC C) A2 + D2 ⇌ 2 AD D) A2 + E2 ⇌ 2 AE" class="answers-bank-image d-inline" rel="preload" >
-Which reaction has the smallest equilibrium constant?

Accepted Answer

A)  A2 + B2 ⇌ 2 AB
B)  A2 + C2 ⇌ 2 AC
C)  A2 + D2 ⇌ 2 AD
D)  A2 + E2 ⇌ 2 AEE) A) and D)
F) None of the above

Question 20

Given the reaction: 2 HI ⇌ H2 + I2.If Kc' for the reverse reaction is 1.85 × 10-2 at 425°C,what is Kc for the forward reaction at the same temperature?

Accepted Answer

A)  -1.85 × 10-2
B)  1) 85 × 10-2
C)  3) 70 × 10-2
D)  54.1E) C) and D)
F) B) and C)

Exam 13: Chemical Equilibrium

For the reaction shown below,N₂O₄ and NO₂ have equilibrium concentrations,[N₂O₄]_eq = 2.160 × 10^-⁴ and [NO₂]_eq = 1.001 × 10^-³,respectively.The equilibrium constant,K_c,for this reaction equals ________. N₂O₄(g)⇌ 2 NO₂(g)

Correct Answer
verified

At a certain temperature,K_c equals 1.4 × 10² for the reaction: 2 CO(g) + O₂(g) ⇌ 2 CO₂(g) . If a 2.50-L flask contains 0.400 mol of CO₂ and 0.100 mol of O₂ at equilibrium,how many moles of CO are also present in the flask?

Correct Answer
verified

Which statement is true for a reaction with K_c equal to 2.43 × 10^-12?

Correct Answer
verified

Correct Answer
verified

K_c is 1.67 × 10²⁰ at 25°C for the formation of iron(III) oxalate complex ion: Fe³⁺(aq) + 3 C₂O₄^2-(aq) ⇌ [Fe(C₂O₄) ₃]^3-(aq) . If 0.0200 M Fe³⁺ is initially mixed with 1.00 M oxalate ion,what is the concentration of Fe³⁺ ion at equilibrium?

Correct Answer
verified

The following pictures represent the equilibrium state for four different reactions of the type A₂ + X₂ ⇌ 2 AX (X = B,C,D,E) .A atoms are unshaded.X atoms are shaded. -Which reaction has the smallest equilibrium constant?

Correct Answer
verified

For the reaction shown below the value of K_p is ________ than the value of K_c,because Δn = ________. N₂O₄(g)⇌ 2 NO₂(g)

Correct Answer
verified

Which equilibrium below is homogeneous?

Correct Answer
verified

A reaction reaches dynamic equilibrium at a given temperature when

Correct Answer
verified

If K_c = 2.0 x 10³³ at 25°C,for the following reaction: H₂(g) + Cl₂(g) ⇌ 2 HCl(g) ,then find K_p at the same temperature.

Correct Answer
verified

The reaction CaCO₃(s)⇌ CaO(s)+ O₂(g)is endothermic 298 K.The effect of increasing the temperature of the system at equilibrium will ________ (decrease,increase,have no effect on)the total quantity of CaCO₃ once equilibrium is reestablished.

Correct Answer
verified

The reaction CaCO₃(s)⇌ CaO(s)+ O₂(g)is endothermic 298 K.The effect of adding additional CaO to the system at equilibrium will ________ (decrease,increase,have no effect on)the total quantity of CaCO₃ once equilibrium is reestablished.

Correct Answer
verified

The equilibrium constant K_cfor the reaction HF(aq) + H₂O(l) ⇌ H₃O⁺(aq) +F^-(aq) is 3.5 × 10^-4.What is the equilibrium concentration of H₃O⁺ if the initial concentration of HF is 1.0 M?

Correct Answer
verified

Write the equilibrium equation for the reverse reaction: 2 CH₄ (g) + 3 O₂ (g) ⇌ 2 CO (g) + 4 H₂O (g)

Correct Answer
verified

Given the reaction: 2 HI ⇌ H₂ + I₂.If K_c^' for the reverse reaction is 1.85 × 10^-2 at 425°C,what is K_c for the forward reaction at the same temperature?

Correct Answer
verified

Write the equilibrium equation for the reverse reaction: 2 CH₄(g) + 3 O₂(g) ⇌ 2 CO(g) + 4 H₂O(g)

Correct Answer
verified

The pink and blue species below form a violet colored mixture at equilibrium: [Co(H₂O) ₆]²⁺ (aq) + 4 Cl^- (aq) ⇌ [CoCl₄]^2- (aq) + 6 H₂O (l) (pink) (blue) If the concentration of [Co(H₂O) ₆]²⁺ is increased,what happens to the solution?

Correct Answer
verified

A reaction in which reactants form products in the forward reaction and products simultaneously form reactants in the reverse reaction is said to be ________.

Correct Answer
verified

If K_c is the equilibrium constant for a forward reaction,2 A⇌ B,what is K_c´ for the reaction 4 A⇌ 2B?

Correct Answer
verified

Phosphorus pentachloride decomposes to phosphorus trichloride at high temperatures according to the reaction: PCl₅(g) ⇌ PCl₃(g) + Cl₂(g) At 250°C,0.250 M PCl₅ is added to a flask.If K_c = 1.80,what are the equilibrium concentrations of each gas?

Correct Answer
verified

Exam 13: Chemical Equilibrium

For the reaction shown below,N2O4 and NO2 have equilibrium concentrations,[N2O4]eq = 2.160 × 10-4 and [NO2]eq = 1.001 × 10-3,respectively.The equilibrium constant,Kc,for this reaction equals ________. N2O4(g)⇌ 2 NO2(g)

Correct AnswerverifiedShow Answer

At a certain temperature,Kc equals 1.4 × 102 for the reaction: 2 CO(g) + O2(g) ⇌ 2 CO2(g) . If a 2.50-L flask contains 0.400 mol of CO2 and 0.100 mol of O2 at equilibrium,how many moles of CO are also present in the flask?

Correct AnswerverifiedShow Answer

Which statement is true for a reaction with Kc equal to 2.43 × 10-12?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Kc is 1.67 × 1020 at 25°C for the formation of iron(III) oxalate complex ion: Fe3+(aq) + 3 C2O42-(aq) ⇌ [Fe(C2O4) 3]3-(aq) . If 0.0200 M Fe3+ is initially mixed with 1.00 M oxalate ion,what is the concentration of Fe3+ ion at equilibrium?

Correct AnswerverifiedShow Answer

The following pictures represent the equilibrium state for four different reactions of the type A2 + X2 ⇌ 2 AX (X = B,C,D,E) .A atoms are unshaded.X atoms are shaded. -Which reaction has the smallest equilibrium constant?

Correct AnswerverifiedShow Answer

For the reaction shown below the value of Kp is ________ than the value of Kc,because Δn = ________. N2O4(g)⇌ 2 NO2(g)

Correct AnswerverifiedShow Answer

Which equilibrium below is homogeneous?

Correct AnswerverifiedShow Answer

A reaction reaches dynamic equilibrium at a given temperature when

Correct AnswerverifiedShow Answer

If Kc = 2.0 x 1033 at 25°C,for the following reaction: H2(g) + Cl2(g) ⇌ 2 HCl(g) ,then find Kp at the same temperature.

Correct AnswerverifiedShow Answer

The reaction CaCO3(s)⇌ CaO(s)+ O2(g)is endothermic 298 K.The effect of increasing the temperature of the system at equilibrium will ________ (decrease,increase,have no effect on)the total quantity of CaCO3 once equilibrium is reestablished.

Correct AnswerverifiedShow Answer

The reaction CaCO3(s)⇌ CaO(s)+ O2(g)is endothermic 298 K.The effect of adding additional CaO to the system at equilibrium will ________ (decrease,increase,have no effect on)the total quantity of CaCO3 once equilibrium is reestablished.

Correct AnswerverifiedShow Answer

The equilibrium constant Kc for the reaction HF(aq) + H2O(l) ⇌ H3O+(aq) +F-(aq) is 3.5 × 10-4.What is the equilibrium concentration of H3O+ if the initial concentration of HF is 1.0 M?

Correct AnswerverifiedShow Answer

Write the equilibrium equation for the reverse reaction: 2 CH4 (g) + 3 O2 (g) ⇌ 2 CO (g) + 4 H2O (g)

Correct AnswerverifiedShow Answer

Given the reaction: 2 HI ⇌ H2 + I2.If Kc' for the reverse reaction is 1.85 × 10-2 at 425°C,what is Kc for the forward reaction at the same temperature?

Correct AnswerverifiedShow Answer

Write the equilibrium equation for the reverse reaction: 2 CH4(g) + 3 O2(g) ⇌ 2 CO(g) + 4 H2O(g)

Correct AnswerverifiedShow Answer

The pink and blue species below form a violet colored mixture at equilibrium: [Co(H2O) 6]2+ (aq) + 4 Cl- (aq) ⇌ [CoCl4]2- (aq) + 6 H2O (l) (pink) (blue) If the concentration of [Co(H2O) 6]2+ is increased,what happens to the solution?

Correct AnswerverifiedShow Answer

A reaction in which reactants form products in the forward reaction and products simultaneously form reactants in the reverse reaction is said to be ________.

Correct AnswerverifiedShow Answer

If Kc is the equilibrium constant for a forward reaction,2 A⇌ B,what is Kc´ for the reaction 4 A⇌ 2B?

Correct AnswerverifiedShow Answer

Phosphorus pentachloride decomposes to phosphorus trichloride at high temperatures according to the reaction: PCl5(g) ⇌ PCl3(g) + Cl2(g) At 250°C,0.250 M PCl5 is added to a flask.If Kc = 1.80,what are the equilibrium concentrations of each gas?

Correct AnswerverifiedShow Answer

For the reaction shown below,N₂O₄ and NO₂ have equilibrium concentrations,[N₂O₄]_eq = 2.160 × 10^-⁴ and [NO₂]_eq = 1.001 × 10^-³,respectively.The equilibrium constant,K_c,for this reaction equals ________. N₂O₄(g)⇌ 2 NO₂(g)

Correct Answer
verified

At a certain temperature,K_c equals 1.4 × 10² for the reaction: 2 CO(g) + O₂(g) ⇌ 2 CO₂(g) . If a 2.50-L flask contains 0.400 mol of CO₂ and 0.100 mol of O₂ at equilibrium,how many moles of CO are also present in the flask?

Correct Answer
verified

Which statement is true for a reaction with K_c equal to 2.43 × 10^-12?

Correct Answer
verified

Correct Answer
verified

K_c is 1.67 × 10²⁰ at 25°C for the formation of iron(III) oxalate complex ion: Fe³⁺(aq) + 3 C₂O₄^2-(aq) ⇌ [Fe(C₂O₄) ₃]^3-(aq) . If 0.0200 M Fe³⁺ is initially mixed with 1.00 M oxalate ion,what is the concentration of Fe³⁺ ion at equilibrium?

Correct Answer
verified

The following pictures represent the equilibrium state for four different reactions of the type A₂ + X₂ ⇌ 2 AX (X = B,C,D,E) .A atoms are unshaded.X atoms are shaded. -Which reaction has the smallest equilibrium constant?

Correct Answer
verified

For the reaction shown below the value of K_p is ________ than the value of K_c,because Δn = ________. N₂O₄(g)⇌ 2 NO₂(g)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

If K_c = 2.0 x 10³³ at 25°C,for the following reaction: H₂(g) + Cl₂(g) ⇌ 2 HCl(g) ,then find K_p at the same temperature.

Correct Answer
verified

The reaction CaCO₃(s)⇌ CaO(s)+ O₂(g)is endothermic 298 K.The effect of increasing the temperature of the system at equilibrium will ________ (decrease,increase,have no effect on)the total quantity of CaCO₃ once equilibrium is reestablished.

Correct Answer
verified

The reaction CaCO₃(s)⇌ CaO(s)+ O₂(g)is endothermic 298 K.The effect of adding additional CaO to the system at equilibrium will ________ (decrease,increase,have no effect on)the total quantity of CaCO₃ once equilibrium is reestablished.

Correct Answer
verified

The equilibrium constant K_cfor the reaction HF(aq) + H₂O(l) ⇌ H₃O⁺(aq) +F^-(aq) is 3.5 × 10^-4.What is the equilibrium concentration of H₃O⁺ if the initial concentration of HF is 1.0 M?

Correct Answer
verified

Write the equilibrium equation for the reverse reaction: 2 CH₄ (g) + 3 O₂ (g) ⇌ 2 CO (g) + 4 H₂O (g)

Correct Answer
verified

Given the reaction: 2 HI ⇌ H₂ + I₂.If K_c^' for the reverse reaction is 1.85 × 10^-2 at 425°C,what is K_c for the forward reaction at the same temperature?

Correct Answer
verified

Write the equilibrium equation for the reverse reaction: 2 CH₄(g) + 3 O₂(g) ⇌ 2 CO(g) + 4 H₂O(g)

Correct Answer
verified

The pink and blue species below form a violet colored mixture at equilibrium: [Co(H₂O) ₆]²⁺ (aq) + 4 Cl^- (aq) ⇌ [CoCl₄]^2- (aq) + 6 H₂O (l) (pink) (blue) If the concentration of [Co(H₂O) ₆]²⁺ is increased,what happens to the solution?

Correct Answer
verified

Correct Answer
verified

If K_c is the equilibrium constant for a forward reaction,2 A⇌ B,what is K_c´ for the reaction 4 A⇌ 2B?

Correct Answer
verified

Phosphorus pentachloride decomposes to phosphorus trichloride at high temperatures according to the reaction: PCl₅(g) ⇌ PCl₃(g) + Cl₂(g) At 250°C,0.250 M PCl₅ is added to a flask.If K_c = 1.80,what are the equilibrium concentrations of each gas?

Correct Answer
verified