At a certain temperature,bromine and nitric oxide react to form nitrosyl bromide: Br2(g)+ 2 NO(g)⇌ 2 NOBr(g). When initial amounts of Br2,NO,and NOBr are mixed,the concentration of NOBr increases.Which statement below is true?

A) Kc c > Q C) Kc = Q D) More information is needed to make a statement about Kc. A) Kc c > Q C) Kc = Q D) More information is needed to make a statement about Kc.

The decomposition of ammonia is: 2 NH3(g)⇌ N2(g)+ 3 H2(g).If the partial pressure of ammonia is 1.60 × 10-3 atm and the partial pressures of N2 and H2 are each 0.250 atm at equilibrium,what is the value for Kc at 400°C for the forward reaction?

A) 0.500 B) 1.00 C) 1.53 × 103 D) 6.53 × 10-4 A) 0.500 B) 1.00 C) 1.53 × 103 D) 6.53 × 10-4

The oxidation of sulfur dioxide by oxygen to sulfur trioxide has been implicated as an important step in the formation of acid rain: 2 SO2(g)+ O2(g)⇌ 2 SO3(g).If the equilibrium partial pressures of SO2,O2,and SO3 are 0.564 atm,0.102 atm,and 0.333 atm respectively at 1000 K,what is Kp at that temperature?

A) 0.292 B) 3.42 C) 5.79 D) 8.11 A) 0.292 B) 3.42 C) 5.79 D) 8.11

At some temperature,a 4.0 L flask is found to contain 10.0 mol of CO2,8.0 mol of C,and 10.0 mol of CO,at equilibrium.What is the value of the equilibrium constant,Kc,for this reaction?

A) 1.25 B) 0.50 C) 0.40 D) 2.50 A) 1.25 B) 0.50 C) 0.40 D) 2.50

The decomposition of nitrosyl bromide is exothermic: 2 NOBr(g)⇌ 2 NO(g)+ Br2(g).Which of the following changes in reaction condition will shift the reaction to the left?

A) remove NO B) decrease the temperature C) decrease the pressure D) None of these A) remove NO B) decrease the temperature C) decrease the pressure D) None of these

Exam 14: Chemical Equilibrium

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. -If the volume of the equilibrium mixture is decreased,what will happen to the number of AB molecules and the number of B atoms?

(Multiple Choice)

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Question 61

At a certain temperature,bromine and nitric oxide react to form nitrosyl bromide: Br₂(g)+ 2 NO(g)⇌ 2 NOBr(g). When initial amounts of Br₂,NO,and NOBr are mixed,the concentration of NOBr increases.Which statement below is true?

(Multiple Choice)

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Question 62

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 1.00 atm of each gas,in what direction will the system shift to reach equilibrium?

(Multiple Choice)

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Question 63

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 64

A catalyst increases the rate of a chemical reaction by providing a lower-energy mechanism for the reaction.When this occurs,which one of the following is not affected?

(Multiple Choice)

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Question 65

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

(Multiple Choice)

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Question 66

Picture (1)represents the equilibrium mixture for the reaction A + B ⇌ 2 AB at 298 K. -If this reaction is exothermic,which picture (2)-(4)represents the equilibrium mixture at 400 K?

(Multiple Choice)

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Question 67

Gaseous hydrogen bromide decomposes at elevated temperatures according to the following equation: . At a certain temperature a 2.00 L flask is initially filled only with 0.600 mol of HBr.What is the value of K_c at that temperature if the flask contains 0.104 mol of H₂ at equilibrium?

(Multiple Choice)

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Question 68

The decomposition of ammonia is: 2 NH₃(g)⇌ N₂(g)+ 3 H₂(g).If the partial pressure of ammonia is 1.60 × 10^-3 atm and the partial pressures of N₂ and H₂ are each 0.250 atm at equilibrium,what is the value for K_c at 400°C for the forward reaction?

(Multiple Choice)

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Question 69

What is true about the relationship of K_p and K_cfor the reaction: 2 CH₄(g)+ 3 O₂(g)⇌ 2 CO(g)+ 4 H₂O(g)?

(Multiple Choice)

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Question 70

For the reaction A₂ + 2 B₃ ⇌ 2 AB₃,the rate of the forward reaction is 0.25 M/s and the rate of the reverse reaction is 0.75 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 71

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 72

The oxidation of sulfur dioxide by oxygen to sulfur trioxide has been implicated as an important step in the formation of acid rain: 2 SO₂(g)+ O₂(g)⇌ 2 SO₃(g).If the equilibrium partial pressures of SO₂,O₂,and SO₃ are 0.564 atm,0.102 atm,and 0.333 atm respectively at 1000 K,what is K_p at that temperature?

(Multiple Choice)

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Question 73

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)

(Short Answer)

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Question 74

Salt solubilities can be compared by the concentration of cation formed when the salt dissolves in the general reaction: M_aX_b(s)⇌ a M^b+(aq)+ b X^a-(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 75

At some temperature,a 4.0 L flask is found to contain 10.0 mol of CO₂,8.0 mol of C,and 10.0 mol of CO,at equilibrium.What is the value of the equilibrium constant,K_c,for this reaction?

(Multiple Choice)

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Question 76

The equilibrium constant,K_p,equals 3.40 for the isomerization reaction: cis-2-butene ⇌ trans-2-butene. If a flask initially contains 0.250 atm of cis-2-butene and 0.125 atm of trans-2-butene,what is the equilibrium pressure of each gas?

(Multiple Choice)

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Question 77

A reaction reaches dynamic equilibrium at a given temperature when

(Multiple Choice)

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Question 78

The decomposition of nitrosyl bromide is exothermic: 2 NOBr(g)⇌ 2 NO(g)+ Br₂(g).Which of the following changes in reaction condition will shift the reaction to the left?

(Multiple Choice)

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Question 79

Picture (1)represents the equilibrium mixture for the gas-phase reaction A + B ⇌ 2 AB at 298 K.If the volume of the equilibrium mixture is decreased,which picture (2)-(4)represents the equilibrium at the reduced volume?

(Multiple Choice)

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Question 80

Showing 61 - 80 of 171

At a certain temperature,bromine and nitric oxide react to form nitrosyl bromide: Br₂(g)+ 2 NO(g)⇌ 2 NOBr(g). When initial amounts of Br₂,NO,and NOBr are mixed,the concentration of NOBr increases.Which statement below is true?

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 1.00 atm of each gas,in what direction will the system shift to reach equilibrium?

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

A catalyst increases the rate of a chemical reaction by providing a lower-energy mechanism for the reaction.When this occurs,which one of the following is not affected?

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

Picture (1)represents the equilibrium mixture for the reaction A + B ⇌ 2 AB at 298 K. -If this reaction is exothermic,which picture (2)-(4)represents the equilibrium mixture at 400 K?

Gaseous hydrogen bromide decomposes at elevated temperatures according to the following equation: . At a certain temperature a 2.00 L flask is initially filled only with 0.600 mol of HBr.What is the value of K_c at that temperature if the flask contains 0.104 mol of H₂ at equilibrium?

The decomposition of ammonia is: 2 NH₃(g)⇌ N₂(g)+ 3 H₂(g).If the partial pressure of ammonia is 1.60 × 10^-3 atm and the partial pressures of N₂ and H₂ are each 0.250 atm at equilibrium,what is the value for K_c at 400°C for the forward reaction?

What is true about the relationship of K_p and K_cfor the reaction: 2 CH₄(g)+ 3 O₂(g)⇌ 2 CO(g)+ 4 H₂O(g)?

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

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)

Salt solubilities can be compared by the concentration of cation formed when the salt dissolves in the general reaction: M_aX_b(s)⇌ a M^b+(aq)+ b X^a-(aq).Given the following salts and their equilibrium constants for the reaction above at 25°C,which salt is the least soluble?

At some temperature,a 4.0 L flask is found to contain 10.0 mol of CO₂,8.0 mol of C,and 10.0 mol of CO,at equilibrium.What is the value of the equilibrium constant,K_c,for this reaction?

The equilibrium constant,K_p,equals 3.40 for the isomerization reaction: cis-2-butene ⇌ trans-2-butene. If a flask initially contains 0.250 atm of cis-2-butene and 0.125 atm of trans-2-butene,what is the equilibrium pressure of each gas?

A reaction reaches dynamic equilibrium at a given temperature when

The decomposition of nitrosyl bromide is exothermic: 2 NOBr(g)⇌ 2 NO(g)+ Br₂(g).Which of the following changes in reaction condition will shift the reaction to the left?

Picture (1)represents the equilibrium mixture for the gas-phase reaction A + B ⇌ 2 AB at 298 K.If the volume of the equilibrium mixture is decreased,which picture (2)-(4)represents the equilibrium at the reduced volume?

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Exam 14: Chemical Equilibrium

At a certain temperature,bromine and nitric oxide react to form nitrosyl bromide: Br2(g)+ 2 NO(g)⇌ 2 NOBr(g). When initial amounts of Br2,NO,and NOBr are mixed,the concentration of NOBr increases.Which statement below is true?

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 1.00 atm of each gas,in what direction will the system shift to reach equilibrium?

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

A catalyst increases the rate of a chemical reaction by providing a lower-energy mechanism for the reaction.When this occurs,which one of the following is not affected?

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

Picture (1)represents the equilibrium mixture for the reaction A + B ⇌ 2 AB at 298 K. -If this reaction is exothermic,which picture (2)-(4)represents the equilibrium mixture at 400 K?

Gaseous hydrogen bromide decomposes at elevated temperatures according to the following equation: . At a certain temperature a 2.00 L flask is initially filled only with 0.600 mol of HBr.What is the value of Kc at that temperature if the flask contains 0.104 mol of H2 at equilibrium?

The decomposition of ammonia is: 2 NH3(g)⇌ N2(g)+ 3 H2(g).If the partial pressure of ammonia is 1.60 × 10-3 atm and the partial pressures of N2 and H2 are each 0.250 atm at equilibrium,what is the value for Kc at 400°C for the forward reaction?

What is true about the relationship of Kp and Kc for the reaction: 2 CH4(g)+ 3 O2(g)⇌ 2 CO(g)+ 4 H2O(g)?

For the reaction A2 + 2 B3 ⇌ 2 AB3,the rate of the forward reaction is 0.25 M/s and the rate of the reverse reaction is 0.75 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.

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

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)

Salt solubilities can be compared by the concentration of cation formed when the salt dissolves in the general reaction: MaXb(s)⇌ a Mb+(aq)+ b Xa-(aq).Given the following salts and their equilibrium constants for the reaction above at 25°C,which salt is the least soluble?

At some temperature,a 4.0 L flask is found to contain 10.0 mol of CO2,8.0 mol of C,and 10.0 mol of CO,at equilibrium.What is the value of the equilibrium constant,Kc,for this reaction?

The equilibrium constant,Kp,equals 3.40 for the isomerization reaction: cis-2-butene ⇌ trans-2-butene. If a flask initially contains 0.250 atm of cis-2-butene and 0.125 atm of trans-2-butene,what is the equilibrium pressure of each gas?

A reaction reaches dynamic equilibrium at a given temperature when

The decomposition of nitrosyl bromide is exothermic: 2 NOBr(g)⇌ 2 NO(g)+ Br2(g).Which of the following changes in reaction condition will shift the reaction to the left?

Picture (1)represents the equilibrium mixture for the gas-phase reaction A + B ⇌ 2 AB at 298 K.If the volume of the equilibrium mixture is decreased,which picture (2)-(4)represents the equilibrium at the reduced volume?

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Mass Relationships in Chemical Reactions

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Covalent Compounds: Bonding Theories and Molecular Structure

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Gases: Their Properties and Behavior

Liquids, solids, and Phase Changes

Solutions and Their Properties

Chemical Kinetics

Aqueous Equilibria: Acids and Bases

Applications of Aqueous Equilibria

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At a certain temperature,bromine and nitric oxide react to form nitrosyl bromide: Br₂(g)+ 2 NO(g)⇌ 2 NOBr(g). When initial amounts of Br₂,NO,and NOBr are mixed,the concentration of NOBr increases.Which statement below is true?

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 1.00 atm of each gas,in what direction will the system shift to reach equilibrium?

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

Gaseous hydrogen bromide decomposes at elevated temperatures according to the following equation: . At a certain temperature a 2.00 L flask is initially filled only with 0.600 mol of HBr.What is the value of K_c at that temperature if the flask contains 0.104 mol of H₂ at equilibrium?

The decomposition of ammonia is: 2 NH₃(g)⇌ N₂(g)+ 3 H₂(g).If the partial pressure of ammonia is 1.60 × 10^-3 atm and the partial pressures of N₂ and H₂ are each 0.250 atm at equilibrium,what is the value for K_c at 400°C for the forward reaction?

What is true about the relationship of K_p and K_cfor the reaction: 2 CH₄(g)+ 3 O₂(g)⇌ 2 CO(g)+ 4 H₂O(g)?

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)

Salt solubilities can be compared by the concentration of cation formed when the salt dissolves in the general reaction: M_aX_b(s)⇌ a M^b+(aq)+ b X^a-(aq).Given the following salts and their equilibrium constants for the reaction above at 25°C,which salt is the least soluble?

At some temperature,a 4.0 L flask is found to contain 10.0 mol of CO₂,8.0 mol of C,and 10.0 mol of CO,at equilibrium.What is the value of the equilibrium constant,K_c,for this reaction?

The equilibrium constant,K_p,equals 3.40 for the isomerization reaction: cis-2-butene ⇌ trans-2-butene. If a flask initially contains 0.250 atm of cis-2-butene and 0.125 atm of trans-2-butene,what is the equilibrium pressure of each gas?

The decomposition of nitrosyl bromide is exothermic: 2 NOBr(g)⇌ 2 NO(g)+ Br₂(g).Which of the following changes in reaction condition will shift the reaction to the left?