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)

Nitric oxide reacts with oxygen to form nitrogen dioxide: 2 NO(g)+ O2(g)⇌ 2 NO2(g) What is Kc' for the reverse reaction if the equilibrium concentration of NO is 0.300 M,O2 is 0.200 M,and NO2 is 0.530 M at 25°C?

A) 0)0340 B) 0)0641 C) 0)624 D) 15.6 A) 0)0340 B) 0)0641 C) 0)624 D) 15.6

What is the value for Kc for the following reaction: PbCl2(s)⇌ Pb2+(aq)+ 2 Cl-(aq), If PbCl2(s)= 1.50 grams,[Pb2+] = 1.6 × 10-2 M and [Cl-] = 3.2 × 10-2 M at equilibrium? (The molar mass of PbCl2(s)is 278 g/mol and its density is 5.85 g/cm3. )

A) 7)6 × 10-7 B) 1)6 × 10-5 C) 6)2 × 104 D) 1)3 × 106 A) 7)6 × 10-7 B) 1)6 × 10-5 C) 6)2 × 104 D) 1)3 × 106

At a certain temperature the equilibrium constant,Kc,equals 0.11 for the reaction: 2 ICl(g)⇌ I2(g)+ Cl2(g). What is the equilibrium concentration of ICl if 0.75 mol of I2 and 0.75 mol of Cl2 are initially mixed in a 2.0-L flask?

A) 0)22 M B) 0)28 M C) 0)45 M D) 0)56 M A) 0)22 M B) 0)28 M C) 0)45 M D) 0)56 M

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

A) Kc = B) Kc = C) Kc = D) Kc = A) Kc = B) Kc = C) Kc = D) Kc =

An equilibrium mixture of CO,O2 and CO2 at a certain temperature contains 0.0010 M CO2 and 0.0015 M O2.At this temperature,Kc,equals 1.4 × 102 for the reaction: 2 CO(g)+ O2(g)⇌ 2 CO2(g). What is the equilibrium concentration of CO?

A) 4)8 × 10-6 M B) 2)2 × 10-3 M C) 9)3 × 10-2 M D) 3)1 × 10-1 M A) 4)8 × 10-6 M B) 2)2 × 10-3 M C) 9)3 × 10-2 M D) 3)1 × 10-1 M

The reaction AS1U1B12S1U1B0 + BS1U1B12 S1U1B0⇌ 2AB has an equilibrium constant KS1U1B1cS1U1B0 = 1.8.The following pictures represent reaction mixtures that contain AS1U1B12S1U1B0 molecules (shaded)and BS1U1B12S1U1B0 molecules (unshaded),and AB molecules. -Which nonequilibrium mixtures will react in the reverse direction to reach equilibrium?

A) reaction mixtures (1)and (2) B) reaction mixtures (1)and (4) C) reaction mixtures (2)and (3) D) reaction mixtures (3)and (4) A) reaction mixtures (1)and (2) B) reaction mixtures (1)and (4) C) reaction mixtures (2)and (3) D) reaction mixtures (3)and (4)

Kp = 1.5 × 103 at 400°C for the reaction 2 NH3(g)⇌ N2(g)+ 3 H2(g).What is the value of Kp for the reaction: 2 N2(g)+ 6 H2(g)⇌ 4 NH3(g)?

A) 4)4 × 10-7 B) 3)3 × 10-4 C) 6)7 × 10-4 D) 2)3 × 106 A) 4)4 × 10-7 B) 3)3 × 10-4 C) 6)7 × 10-4 D) 2)3 × 106

Exam 13: Chemical Equilibrium

Acids donate protons to water according to the general equation: HA(aq)+ H₂O(l)⇌ H₃O⁺(aq)+ A^-(aq) Consider the following acids and their equilibrium constants for reaction with water at 25°C.If all the acids have the same initial concentration,which is the strongest acid (i.e.which donates the most protons to water)?

(Multiple Choice)

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Question 61

For which one of the following reactions will K_c = K_p?

(Multiple Choice)

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Question 62

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 63

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 64

Nitric oxide reacts with oxygen to form nitrogen dioxide: 2 NO(g)+ O₂(g)⇌ 2 NO₂(g) What is K_c'for the reverse reaction if the equilibrium concentration of NO is 0.300 M,O₂ is 0.200 M,and NO₂ is 0.530 M at 25°C?

(Multiple Choice)

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Question 65

What is the value for K_c for the following reaction: PbCl₂(s)⇌ Pb²⁺(aq)+ 2 Cl^-(aq), If PbCl₂(s)= 1.50 grams,[Pb²⁺] = 1.6 × 10^-2 M and [Cl^-] = 3.2 × 10^-2 M at equilibrium? (The molar mass of PbCl₂(s)is 278 g/mol and its density is 5.85 g/cm³. )

(Multiple Choice)

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Question 66

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 after addition of four more CO₂ molecules?

(Multiple Choice)

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Question 67

K_c = 1.2 × 10^-42at 500 K for the reaction shown below. H₂(g)⇌ 2 H(g) If [H₂] = 1 × 10^-2 M and [H] = 1.2 × 10^-22 M,in order to achieve equilibrium a net reaction must occur from to until Q_c = ________.

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Question 68

The reaction CaCO₃(s)⇌ CaO(s)+ O₂(g)is endothermic 298 K.The effect of increasing the total volume of 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 69

Phosphorus pentachloride decomposes to phosphorus trichloride and chlorine gas at elevated temperatures by the following reaction: PCl₅(g)⇌ PCl₃(g)+ Cl₂(g).If K_c = 1.8 at 250°C. What is the value of K_p at the same temperature?

(Multiple Choice)

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Question 70

At a certain temperature the equilibrium constant,K_c,equals 0.11 for the reaction: 2 ICl(g)⇌ I₂(g)+ Cl₂(g). What is the equilibrium concentration of ICl if 0.75 mol of I₂ and 0.75 mol of Cl₂ are initially mixed in a 2.0-L flask?

(Multiple Choice)

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Question 71

The reaction CaCO₃(s)⇌ CaO(s)+ O₂(g)is endothermic 298 K.The effect of increasing the partial pressure of O₂ in 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 72

If additional SCN^- is added to the equilibrium system shown below,Le Châtelier's principle predicts a net reaction from to ,causing the red color to become . Fe³⁺(aq)+ SCN^-(aq)⇌ FeSCN²⁺(aq) yellow colorless red

(Short Answer)

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Question 73

The equilibrium constant,K_p,equals 3.40 at 25°C for the isomerization reaction: Cis-2-butene ⇌ trans-2-butene. If a flask initially contains 5.00 atm of each gas,in what direction will the system shift to reach equilibrium?

(Multiple Choice)

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Question 74

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

(Multiple Choice)

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Question 75

At an elevated temperature,K_p = 4.2 × 10^-9 for the reaction 2 HBr(g)⇌ H₂(g)+ Br₂(g).If the initial partial pressures of HBr,H₂,and Br₂ are 1.0 × 10^-2 atm,2.0 × 10^-4 atm,and 2.0 × 10^-4 atm,respectively,what is the equilibrium partial pressure of H₂?

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Question 76

An equilibrium mixture of CO,O₂ and CO₂ at a certain temperature contains 0.0010 M CO₂ and 0.0015 M O₂.At this temperature,K_c,equals 1.4 × 10² for the reaction: 2 CO(g)+ O₂(g)⇌ 2 CO₂(g). What is the equilibrium concentration of CO?

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Question 77

The reaction A₂ + B₂⇌ 2AB 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 nonequilibrium mixtures will react in the reverse direction to reach equilibrium?

(Multiple Choice)

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Question 78

K_p = 1.5 × 10³ at 400°C for the reaction 2 NH₃(g)⇌ N₂(g)+ 3 H₂(g).What is the value of K_p for the reaction: 2 N₂(g)+ 6 H₂(g)⇌ 4 NH₃(g)?

(Multiple Choice)

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Question 79

Which of the following changes in reaction conditions will alter the composition of an equilibrium mixture of gases for a reaction having unequal moles of gaseous products and gaseous reactants?

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Question 80

Showing 61 - 80 of 166

Exam 13: Chemical Equilibrium

For which one of the following reactions will Kc = Kp?

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 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?

Nitric oxide reacts with oxygen to form nitrogen dioxide: 2 NO(g)+ O2(g)⇌ 2 NO2(g) What is Kc' for the reverse reaction if the equilibrium concentration of NO is 0.300 M,O2 is 0.200 M,and NO2 is 0.530 M at 25°C?

What is the value for Kc for the following reaction: PbCl2(s)⇌ Pb2+(aq)+ 2 Cl-(aq), If PbCl2(s)= 1.50 grams,[Pb2+] = 1.6 × 10-2 M and [Cl-] = 3.2 × 10-2 M at equilibrium? (The molar mass of PbCl2(s)is 278 g/mol and its density is 5.85 g/cm3. )

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 after addition of four more CO2 molecules?

Kc = 1.2 × 10-42 at 500 K for the reaction shown below. H2(g)⇌ 2 H(g) If [H2] = 1 × 10-2 M and [H] = 1.2 × 10-22 M,in order to achieve equilibrium a net reaction must occur from ________ to ________ until Qc = ________.

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

Phosphorus pentachloride decomposes to phosphorus trichloride and chlorine gas at elevated temperatures by the following reaction: PCl5(g)⇌ PCl3(g)+ Cl2(g).If Kc = 1.8 at 250°C. What is the value of Kp at the same temperature?

At a certain temperature the equilibrium constant,Kc,equals 0.11 for the reaction: 2 ICl(g)⇌ I2(g)+ Cl2(g). What is the equilibrium concentration of ICl if 0.75 mol of I2 and 0.75 mol of Cl2 are initially mixed in a 2.0-L flask?

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

If additional SCN- is added to the equilibrium system shown below,Le Châtelier's principle predicts a net reaction from ________ to ________,causing the red color to become ________. Fe3+(aq)+ SCN-(aq)⇌ FeSCN2+(aq) yellow colorless red

The equilibrium constant,Kp,equals 3.40 at 25°C for the isomerization reaction: Cis-2-butene ⇌ trans-2-butene. If a flask initially contains 5.00 atm of each gas,in what direction will the system shift to reach equilibrium?

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

At an elevated temperature,Kp = 4.2 × 10-9 for the reaction 2 HBr(g)⇌ H2(g)+ Br2(g).If the initial partial pressures of HBr,H2,and Br2 are 1.0 × 10-2 atm,2.0 × 10-4 atm,and 2.0 × 10-4 atm,respectively,what is the equilibrium partial pressure of H2?

An equilibrium mixture of CO,O2 and CO2 at a certain temperature contains 0.0010 M CO2 and 0.0015 M O2.At this temperature,Kc,equals 1.4 × 102 for the reaction: 2 CO(g)+ O2(g)⇌ 2 CO2(g). What is the equilibrium concentration of CO?

The reaction A2 + B2 ⇌ 2AB 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 nonequilibrium mixtures will react in the reverse direction to reach equilibrium?

Kp = 1.5 × 103 at 400°C for the reaction 2 NH3(g)⇌ N2(g)+ 3 H2(g).What is the value of Kp for the reaction: 2 N2(g)+ 6 H2(g)⇌ 4 NH3(g)?

Which of the following changes in reaction conditions will alter the composition of an equilibrium mixture of gases for a reaction having unequal moles of gaseous products and gaseous reactants?

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For which one of the following reactions will K_c = K_p?

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?

Nitric oxide reacts with oxygen to form nitrogen dioxide: 2 NO(g)+ O₂(g)⇌ 2 NO₂(g) What is K_c'for the reverse reaction if the equilibrium concentration of NO is 0.300 M,O₂ is 0.200 M,and NO₂ is 0.530 M at 25°C?

What is the value for K_c for the following reaction: PbCl₂(s)⇌ Pb²⁺(aq)+ 2 Cl^-(aq), If PbCl₂(s)= 1.50 grams,[Pb²⁺] = 1.6 × 10^-2 M and [Cl^-] = 3.2 × 10^-2 M at equilibrium? (The molar mass of PbCl₂(s)is 278 g/mol and its density is 5.85 g/cm³. )

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 after addition of four more CO₂ molecules?

K_c = 1.2 × 10^-42at 500 K for the reaction shown below. H₂(g)⇌ 2 H(g) If [H₂] = 1 × 10^-2 M and [H] = 1.2 × 10^-22 M,in order to achieve equilibrium a net reaction must occur from to until Q_c = ________.

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

Phosphorus pentachloride decomposes to phosphorus trichloride and chlorine gas at elevated temperatures by the following reaction: PCl₅(g)⇌ PCl₃(g)+ Cl₂(g).If K_c = 1.8 at 250°C. What is the value of K_p at the same temperature?

At a certain temperature the equilibrium constant,K_c,equals 0.11 for the reaction: 2 ICl(g)⇌ I₂(g)+ Cl₂(g). What is the equilibrium concentration of ICl if 0.75 mol of I₂ and 0.75 mol of Cl₂ are initially mixed in a 2.0-L flask?

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

If additional SCN^- is added to the equilibrium system shown below,Le Châtelier's principle predicts a net reaction from to ,causing the red color to become . Fe³⁺(aq)+ SCN^-(aq)⇌ FeSCN²⁺(aq) yellow colorless red

The equilibrium constant,K_p,equals 3.40 at 25°C for the isomerization reaction: Cis-2-butene ⇌ trans-2-butene. If a flask initially contains 5.00 atm of each gas,in what direction will the system shift to reach equilibrium?

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

At an elevated temperature,K_p = 4.2 × 10^-9 for the reaction 2 HBr(g)⇌ H₂(g)+ Br₂(g).If the initial partial pressures of HBr,H₂,and Br₂ are 1.0 × 10^-2 atm,2.0 × 10^-4 atm,and 2.0 × 10^-4 atm,respectively,what is the equilibrium partial pressure of H₂?

An equilibrium mixture of CO,O₂ and CO₂ at a certain temperature contains 0.0010 M CO₂ and 0.0015 M O₂.At this temperature,K_c,equals 1.4 × 10² for the reaction: 2 CO(g)+ O₂(g)⇌ 2 CO₂(g). What is the equilibrium concentration of CO?

The reaction A₂ + B₂⇌ 2AB 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 nonequilibrium mixtures will react in the reverse direction to reach equilibrium?

K_p = 1.5 × 10³ at 400°C for the reaction 2 NH₃(g)⇌ N₂(g)+ 3 H₂(g).What is the value of K_p for the reaction: 2 N₂(g)+ 6 H₂(g)⇌ 4 NH₃(g)?