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?

A) 0.422 mol B) 0.169 mol C) 0.107 mol D) 0.0114 mol A) 0.422 mol B) 0.169 mol C) 0.107 mol D) 0.0114 mol

The solubility of 1:1 salts is measured by the equilibrium constant for the general reaction: MX(s)= Mn+(aq)+ Xn-(aq).Given the following salts and their equilibrium constants for the reaction above at 25°C,which salt is the least soluble?

A) MgCO3,Kc = 6.8 × 10-6 B) CaCO3,Kc = 5.0 × 10-9 C) SrCO3,Kc = 5.6 × 10-10 D) BaCO3,Kc = 2.6 × 10-9 A) MgCO3,Kc = 6.8 × 10-6 B) CaCO3,Kc = 5.0 × 10-9 C) SrCO3,Kc = 5.6 × 10-10 D) BaCO3,Kc = 2.6 × 10-9

A 1.50 L vessel contains an equilibrium mixture of 0.100 mol of NO,0.150 mol of Br2,and 0.250 mol of NOBr at 25°C.What is the value of Kp for the reaction below? 2 NO(g)+ Br2(g)⇌ 2 NOBr(g)

A) 2.56 B) 62.5 C) 1.28 × 102 D) 1.53 × 103 A) 2.56 B) 62.5 C) 1.28 × 102 D) 1.53 × 103

Picture (1)represents an equilibrium mixture of solid CaCOS1U1B13S1U1B0,solid CaO,and gaseous COS1U1B12S1U1B0,obtained as a result of the endothermic decomposition of CaCOS1U1B13S1U1B0. -Which picture (2)-(4)represents the equilibrium mixture when more solid CaO is added?

A) picture (2) B) picture (3) C) picture (4) D) All of these A) picture (2) B) picture (3) C) picture (4) D) All of these

The reaction A2 + B2 ⇌ 2 AB has an equilibrium constant Kc = 1.8.The following pictures represent reaction mixtures that contain A2 molecules (shaded)and B2 molecules (unshaded),and AB molecules.Which reaction mixture is at equilibrium?

A) reaction mixture (1) B) reaction mixture (2) C) reaction mixture (3) D) reaction mixture (4) A) reaction mixture (1) B) reaction mixture (2) C) reaction mixture (3) D) reaction mixture (4)

Picture (1)represents an equilibrium mixture of solid CaCOS1U1B13S1U1B0,solid CaO,and gaseous COS1U1B12S1U1B0,obtained as a result of the endothermic decomposition of CaCOS1U1B13S1U1B0. -Which picture (2)-(4)represents the equilibrium mixture at a higher temperature?

A) picture (2) B) picture (3) C) picture (4) D) None of these A) picture (2) B) picture (3) C) picture (4) D) None of these

What is the equilibrium equation for the reaction: NH4NO3(s)⇌ N2O(g)+ 2 H2O(g)?

A) Kp = [N2O] B) Kp = [N2O][H2O] C) Kp = [N2O][H2O]2 D) Kp = A) Kp = [N2O] B) Kp = [N2O][H2O] C) Kp = [N2O][H2O]2 D) Kp =

Exam 14: Chemical Equilibrium

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?

(Multiple Choice)

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Question 141

For a homogeneous equilibrium of gases,which of the following changes in reaction conditions will not alter the equilibrium concentrations?

(Multiple Choice)

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Question 142

Shown below is a concentration vs.time plot for the reaction A ⇌ B.For this reaction the value of the equilibrium constant is

(Multiple Choice)

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Question 143

The solubility of 1:1 salts is measured by the equilibrium constant for the general reaction: MX(s)= Mⁿ⁺(aq)+ X^n-(aq).Given the following salts and their equilibrium constants for the reaction above at 25°C,which salt is the least soluble?

(Multiple Choice)

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Question 144

Given the hypothetical reaction: 2 A(s)+ x B(g)⇌ 3 C(g),K_p = 0.0105 and K_c = 0.45 at 250°C.What is the value of the coefficient x?

(Multiple Choice)

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Question 145

A 1.50 L vessel contains an equilibrium mixture of 0.100 mol of NO,0.150 mol of Br₂,and 0.250 mol of NOBr at 25°C.What is the value of K_p for the reaction below? 2 NO(g)+ Br₂(g)⇌ 2 NOBr(g)

(Multiple Choice)

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Question 146

Shown below is a concentration vs.time plot for the reaction A ⇌ B.For this reaction the value of the equilibrium constant is

(Multiple Choice)

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Question 147

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

(Short Answer)

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Question 148

"If a stress is applied to a reaction mixture at equilibrium,the reaction occurs in the direction that will relieve the stress." This statement is called

(Multiple Choice)

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Question 149

Picture (1)represents an equilibrium mixture of solid CaCO₃,solid CaO,and gaseous CO₂,obtained as a result of the endothermic decomposition of CaCO₃. -Which picture (2)-(4)represents the equilibrium mixture when more solid CaO is added?

(Multiple Choice)

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Question 150

The reaction A₂ + B₂ ⇌ 2 AB has an equilibrium constant K_c = 1.8.The following pictures represent reaction mixtures that contain A₂ molecules (shaded)and B₂ molecules (unshaded),and AB molecules.Which reaction mixture is at equilibrium?

(Multiple Choice)

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Question 151

Shown below is a concentration vs.time plot for the reaction A ⇌ 2B.For this reaction the value of the equilibrium constant is

(Multiple Choice)

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Question 152

At 25°C,a certain first order reaction has a rate constant equal to 1.00 × 10^-3 s^-1 and an equilibrium constant,K_c,equal to 4.18.What is the rate constant for the reverse reaction?

(Multiple Choice)

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Question 153

Which of the following will result in an increase in the amount of NH₄Cl? NH₄Cl (s)⇌ NH₃ (g)+ HCl (g)

(Multiple Choice)

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Question 154

Picture (1)represents an equilibrium mixture of solid CaCO₃,solid CaO,and gaseous CO₂,obtained as a result of the endothermic decomposition of CaCO₃. -Which picture (2)-(4)represents the equilibrium mixture when more solid CaCO₃ is added?

(Multiple Choice)

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Question 155

Picture (1)represents an equilibrium mixture of solid CaCO₃,solid CaO,and gaseous CO₂,obtained as a result of the endothermic decomposition of CaCO₃. -Which picture (2)-(4)represents the equilibrium mixture at a higher temperature?

(Multiple Choice)

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Question 156

What is the equilibrium equation for the reaction: NH₄NO₃(s)⇌ N₂O(g)+ 2 H₂O(g)?

(Multiple Choice)

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Question 157

A crude type of disappearing ink is based on the following endothermic equilibrium: [Co(H₂O)₆]Cl₂ (aq)⇌ [CoCl₂(H₂O)₄] (aq)+ 2 H₂O (l) (colorless)(blue) If the reactant solution is used to write on a piece of paper and the paper is allowed to partially dry,what can be done to bring out the colored handwriting?

(Multiple Choice)

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Question 158

Find the equilibrium constant for the reaction: A(g)+ B(g)⇌ 2C(g)at 25°C when k equals 1.4 × 10^-12 M^-1s^-1 for the reaction A(g)+ B(g)→ 2C(g)at 25°C and k equals 2.7 × 10^-13 M^-1s^-1 for the reaction:

(Multiple Choice)

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Question 159

For the reaction 2 A + B₂ ⇌ 2 AB,the rate of the forward reaction is 0.75 M/s and the rate of the reverse reaction is 0.25 M/s.The reaction is not at equilibrium.In order to attain equilibrium the reaction must proceed in the ________ (forward,reverse)direction in order to achieve equilibrium.

(Short Answer)

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Question 160

Showing 141 - 160 of 171

Exam 14: Chemical Equilibrium

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?

For a homogeneous equilibrium of gases,which of the following changes in reaction conditions will not alter the equilibrium concentrations?

Shown below is a concentration vs.time plot for the reaction A ⇌ B.For this reaction the value of the equilibrium constant is

The solubility of 1:1 salts is measured by the equilibrium constant for the general reaction: MX(s)= Mn+(aq)+ Xn-(aq).Given the following salts and their equilibrium constants for the reaction above at 25°C,which salt is the least soluble?

Given the hypothetical reaction: 2 A(s)+ x B(g)⇌ 3 C(g),Kp = 0.0105 and Kc = 0.45 at 250°C.What is the value of the coefficient x?

A 1.50 L vessel contains an equilibrium mixture of 0.100 mol of NO,0.150 mol of Br2,and 0.250 mol of NOBr at 25°C.What is the value of Kp for the reaction below? 2 NO(g)+ Br2(g)⇌ 2 NOBr(g)

Shown below is a concentration vs.time plot for the reaction A ⇌ B.For this reaction the value of the equilibrium constant is

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

"If a stress is applied to a reaction mixture at equilibrium,the reaction occurs in the direction that will relieve the stress." This statement is called

Picture (1)represents an equilibrium mixture of solid CaCO3,solid CaO,and gaseous CO2,obtained as a result of the endothermic decomposition of CaCO3. -Which picture (2)-(4)represents the equilibrium mixture when more solid CaO is added?

The reaction A2 + B2 ⇌ 2 AB has an equilibrium constant Kc = 1.8.The following pictures represent reaction mixtures that contain A2 molecules (shaded)and B2 molecules (unshaded),and AB molecules.Which reaction mixture is at equilibrium?

Shown below is a concentration vs.time plot for the reaction A ⇌ 2B.For this reaction the value of the equilibrium constant is

At 25°C,a certain first order reaction has a rate constant equal to 1.00 × 10-3 s-1 and an equilibrium constant,Kc,equal to 4.18.What is the rate constant for the reverse reaction?

Which of the following will result in an increase in the amount of NH4Cl? NH4Cl (s)⇌ NH3 (g)+ HCl (g)

Picture (1)represents an equilibrium mixture of solid CaCO3,solid CaO,and gaseous CO2,obtained as a result of the endothermic decomposition of CaCO3. -Which picture (2)-(4)represents the equilibrium mixture when more solid CaCO3 is added?

Picture (1)represents an equilibrium mixture of solid CaCO3,solid CaO,and gaseous CO2,obtained as a result of the endothermic decomposition of CaCO3. -Which picture (2)-(4)represents the equilibrium mixture at a higher temperature?

What is the equilibrium equation for the reaction: NH4NO3(s)⇌ N2O(g)+ 2 H2O(g)?

Find the equilibrium constant for the reaction: A(g)+ B(g)⇌ 2C(g)at 25°C when k equals 1.4 × 10-12 M-1s-1 for the reaction A(g)+ B(g)→ 2C(g)at 25°C and k equals 2.7 × 10-13 M-1s-1 for the reaction:

For the reaction 2 A + B2 ⇌ 2 AB,the rate of the forward reaction is 0.75 M/s and the rate of the reverse reaction is 0.25 M/s.The reaction is not at equilibrium.In order to attain equilibrium the reaction must proceed in the ________ (forward,reverse)direction in order to achieve equilibrium.

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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?

The solubility of 1:1 salts is measured by the equilibrium constant for the general reaction: MX(s)= Mⁿ⁺(aq)+ X^n-(aq).Given the following salts and their equilibrium constants for the reaction above at 25°C,which salt is the least soluble?

Given the hypothetical reaction: 2 A(s)+ x B(g)⇌ 3 C(g),K_p = 0.0105 and K_c = 0.45 at 250°C.What is the value of the coefficient x?

A 1.50 L vessel contains an equilibrium mixture of 0.100 mol of NO,0.150 mol of Br₂,and 0.250 mol of NOBr at 25°C.What is the value of K_p for the reaction below? 2 NO(g)+ Br₂(g)⇌ 2 NOBr(g)

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

Picture (1)represents an equilibrium mixture of solid CaCO₃,solid CaO,and gaseous CO₂,obtained as a result of the endothermic decomposition of CaCO₃. -Which picture (2)-(4)represents the equilibrium mixture when more solid CaO is added?

The reaction A₂ + B₂ ⇌ 2 AB has an equilibrium constant K_c = 1.8.The following pictures represent reaction mixtures that contain A₂ molecules (shaded)and B₂ molecules (unshaded),and AB molecules.Which reaction mixture is at equilibrium?

At 25°C,a certain first order reaction has a rate constant equal to 1.00 × 10^-3 s^-1 and an equilibrium constant,K_c,equal to 4.18.What is the rate constant for the reverse reaction?

Which of the following will result in an increase in the amount of NH₄Cl? NH₄Cl (s)⇌ NH₃ (g)+ HCl (g)

Picture (1)represents an equilibrium mixture of solid CaCO₃,solid CaO,and gaseous CO₂,obtained as a result of the endothermic decomposition of CaCO₃. -Which picture (2)-(4)represents the equilibrium mixture when more solid CaCO₃ is added?

Picture (1)represents an equilibrium mixture of solid CaCO₃,solid CaO,and gaseous CO₂,obtained as a result of the endothermic decomposition of CaCO₃. -Which picture (2)-(4)represents the equilibrium mixture at a higher temperature?

What is the equilibrium equation for the reaction: NH₄NO₃(s)⇌ N₂O(g)+ 2 H₂O(g)?

Find the equilibrium constant for the reaction: A(g)+ B(g)⇌ 2C(g)at 25°C when k equals 1.4 × 10^-12 M^-1s^-1 for the reaction A(g)+ B(g)→ 2C(g)at 25°C and k equals 2.7 × 10^-13 M^-1s^-1 for the reaction:

For the reaction 2 A + B₂ ⇌ 2 AB,the rate of the forward reaction is 0.75 M/s and the rate of the reverse reaction is 0.25 M/s.The reaction is not at equilibrium.In order to attain equilibrium the reaction must proceed in the ________ (forward,reverse)direction in order to achieve equilibrium.