At a certain temperature,hydrogen and iodine react to form hydrogen iodide: H2(g)+ I2(g)⇌ 2 HI (g). When initial amounts of H2,I2,and HI are mixed,the concentration of HI 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.

Oxalic acid can donate two protons to water in successive reactions: (1)H2C2O4(aq)+ H2O(l)⇌ H3O+(aq)+ HC2O4-(aq) (2)HC2O4-(aq)+ H2O(l)⇌ H3O+(aq)+ C2O42-(aq) If Kc1 = 5.9 × 10-2 and Kc2 = 6.4 × 10-5 at 25°C,what is the value of Kc for reaction (3)? (3)H2C2O4(aq)+ 2 H2O(l)⇌ 2 H3O+(aq)+ C2O42-(aq)

A) 3.8 × 10-6 B) 1.1 × 10-3 C) 5.9 × 10-2 D) 9.2 × 102 A) 3.8 × 10-6 B) 1.1 × 10-3 C) 5.9 × 10-2 D) 9.2 × 102

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?

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 M 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 M

Nickel metal can be prepared by the reduction of nickel oxide: NiO(s)+ CO(g)⇌ CO2(g)+ Ni(s) At 936 K,Kp = 4.54 × 103 and at 1125 K,Kp = 1.58 × 103.Which statement is true?

A) The activation energy decreases with increasing temperature. B) The activation energy increases with increasing temperature. C) The reaction is endothermic. D) The reaction is exothermic. A) The activation energy decreases with increasing temperature. B) The activation energy increases with increasing temperature. C) The reaction is endothermic. D) The reaction is exothermic.

The overall reaction for photosynthesis can be represented by the following equation: 6 CO2(g)+ 6 H2O(l)⇌ C6H12O6(s)+ 6 O2(g) The enthalpy change for this reaction is 2802 kJ.Which of the following changes in condition will shift the equilibrium to the right?

A) increase the pressure of O2 B) increase the temperature C) add water D) add C6H12O6(s) A) increase the pressure of O2 B) increase the temperature C) add water D) add C6H12O6(s)

The equilibrium constant is equal to 5.00 at 1300 K for the reaction: 2 SO2(g)+ O2(g)⇌ 2 SO3(g). If initial concentrations are [SO2] = 1.20 M,[O2] = 0.45 M,and [SO3] = 1.80 M,the system is

A) at equilibrium. B) not at equilibrium and will remain in an unequilibrated state. C) not at equilibrium and will shift to the left to achieve an equilibrium state. D) not at equilibrium and will shift to the right to achieve an equilibrium state. A) at equilibrium. B) not at equilibrium and will remain in an unequilibrated state. C) not at equilibrium and will shift to the left to achieve an equilibrium state. D) not at equilibrium and will shift to the right to achieve an equilibrium state.

The following pictures represent mixtures of A2B4 molecules and AB2 molecules,which interconvert according to the equation A2B4 ⇌ 2 AB2.If mixture (1)is at equilibrium,which of the other mixtures are also at equilibrium?

A) mixture (2) B) mixture (3) C) mixture (4) D) None of the other mixtures are at equilibrium. A) mixture (2) B) mixture (3) C) mixture (4) D) None of the other mixtures are at equilibrium.

Cyclohexane (C6H12)undergoes a molecular rearrangement in the presence of AlCl3 to form methylcyclopentane (CH3C5H9)according to the equation: C6H12 ⇌ CH3C5H9 If Kc = 0.143 at 25°C for this reaction,find the equilibrium concentrations of C6H12 and CH3C5H9 if the initial concentrations are 0.200 M and 0.100 M,respectively.

A) [C6H12] = 0.0625 and [CH3C5H9] = 0.062 M B) [C6H12] = 0.138 and [CH3C5H9] = 0.162 M C) [C6H12] = 0.262 M and [CH3C5H9] = 0.038 M D) [C6H12] = 0.282 and [CH3C5H9] = 0.018 M A) [C6H12] = 0.0625 and [CH3C5H9] = 0.062 M B) [C6H12] = 0.138 and [CH3C5H9] = 0.162 M C) [C6H12] = 0.262 M and [CH3C5H9] = 0.038 M D) [C6H12] = 0.282 and [CH3C5H9] = 0.018 M

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) 0.23 M B) 0.28 M C) 0.45 M D) 0.56 A) 0.23 M B) 0.28 M C) 0.45 M D) 0.56

If Kc equals 0.110 at 25°C for the reaction: N2O4(g)⇌ 2 NO2(g),what is Kc for the reaction: 6NO2(g)⇌ 3 N2O4(g)?

A) 1.3 × 10-3 B) 751 C) 7.5 D) 0.11 A) 1.3 × 10-3 B) 751 C) 7.5 D) 0.11

Exam 14: Chemical Equilibrium

At a certain temperature,hydrogen and iodine react to form hydrogen iodide: H₂(g)+ I₂(g)⇌ 2 HI(g). When initial amounts of H₂,I₂,and HI are mixed,the concentration of HI increases.Which statement below is true?

(Multiple Choice)

4.8/5

(79)

Question 121

Oxalic acid can donate two protons to water in successive reactions: (1)H₂C₂O₄(aq)+ H₂O(l)⇌ H₃O⁺(aq)+ HC₂O₄^-(aq) (2)HC₂O₄^-(aq)+ H₂O(l)⇌ H₃O⁺(aq)+ C₂O₄^2-(aq) If K_c1 = 5.9 × 10^-2 and K_c2 = 6.4 × 10^-5 at 25°C,what is the value of K_c for reaction (3)? (3)H₂C₂O₄(aq)+ 2 H₂O(l)⇌ 2 H₃O⁺(aq)+ C₂O₄^2-(aq)

(Multiple Choice)

4.9/5

(77)

Question 122

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?

(Multiple Choice)

4.8/5

(68)

Question 123

Nickel metal can be prepared by the reduction of nickel oxide: NiO(s)+ CO(g)⇌ CO₂(g)+ Ni(s) At 936 K,K_p = 4.54 × 10³ and at 1125 K,K_p = 1.58 × 10³.Which statement is true?

(Multiple Choice)

4.9/5

(77)

Question 124

The overall reaction for photosynthesis can be represented by the following equation: 6 CO₂(g)+ 6 H₂O(l)⇌ C₆H₁₂O₆(s)+ 6 O₂(g) The enthalpy change for this reaction is 2802 kJ.Which of the following changes in condition will shift the equilibrium to the right?

(Multiple Choice)

4.9/5

(64)

Question 125

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)

4.8/5

(92)

Question 126

The equilibrium constant is equal to 5.00 at 1300 K for the reaction: 2 SO₂(g)+ O₂(g)⇌ 2 SO₃(g). If initial concentrations are [SO₂] = 1.20 M,[O₂] = 0.45 M,and [SO₃] = 1.80 M,the system is

(Multiple Choice)

4.8/5

(72)

Question 127

The following pictures represent mixtures of A₂B₄ molecules and AB₂ molecules,which interconvert according to the equation A₂B₄ ⇌ 2 AB₂.If mixture (1)is at equilibrium,which of the other mixtures are also at equilibrium?

(Multiple Choice)

4.7/5

(74)

Question 128

Cyclohexane (C₆H₁₂)undergoes a molecular rearrangement in the presence of AlCl₃ to form methylcyclopentane (CH₃C₅H₉)according to the equation: C₆H₁₂ ⇌ CH₃C₅H₉ If K_c = 0.143 at 25°C for this reaction,find the equilibrium concentrations of C₆H₁₂ and CH₃C₅H₉ if the initial concentrations are 0.200 M and 0.100 M,respectively.

(Multiple Choice)

4.9/5

(77)

Question 129

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)

4.9/5

(70)

Question 130

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)

4.9/5

(79)

Question 131

At 1000 K,K_p = 19.9 for the reaction Fe₂O₃(s)+ 3 CO(g)⇌ 2 Fe(s)+ 3 CO₂(g).What is the value of K_p for the reaction 2 Fe₂O₃(s)+ 6 CO(g)⇌ 4 Fe(s)+ 6 CO₂(g)?

(Short Answer)

4.9/5

(76)

Question 132

What is the equilibrium equation for the following reaction? 2 H₂O (l)⇌ H₃O⁺ (aq)+ OH^- (aq)

(Multiple Choice)

4.9/5

(81)

Question 133

Consider the reaction A + B ⇌ 2 AB.The vessel on the right contains an equilibrium mixture of A atoms (shaded spheres),B atoms (unshaded spheres),and AB molecules. -If the barrier between the two vessels is removed and the contents of the two vessels are allowed to mix,what will be observed?

(Multiple Choice)

5.0/5

(100)

Question 134

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)

4.9/5

(72)

Question 135

For the reaction: 4 HCl(g)+ O₂(g)⇌ 2 Cl₂(g)+ 2 H₂O(l),the equilibrium constant is 0.063 at 400 K.If the reaction quotient is 0.100,which of the following statements is not correct?

(Multiple Choice)

4.8/5

(84)

Question 136

If K_c equals 0.110 at 25°C for the reaction: N₂O₄(g)⇌ 2 NO₂(g),what is K_c for the reaction: 6NO₂(g)⇌ 3 N₂O₄(g)?

(Multiple Choice)

4.7/5

(84)

Question 137

For the reaction H₂(g)+ S(s)⇌ H₂S(g),if the rate constant for the forward reaction is greater than the rate constant for the reverse reaction,the value of K_c must be ________ (equal to,greater than,less than)1.

(Short Answer)

4.8/5

(99)

Question 138

For the reaction shown below,which change in conditions made to the system at equilibrium will result in a net reaction to the right to form more product? C(s)+ 2 H₂(g)⇌ CH₄(g)ΔH° = -74.8 kJ

(Multiple Choice)

4.8/5

(67)

Question 139

Which statement is true for a reaction with K_c equal to 8.90 × 10^-12?

(Multiple Choice)

4.9/5

(68)

Question 140

Showing 121 - 140 of 171

Exam 14: Chemical Equilibrium

At a certain temperature,hydrogen and iodine react to form hydrogen iodide: H2(g)+ I2(g)⇌ 2 HI (g). When initial amounts of H2,I2,and HI are mixed,the concentration of HI increases.Which statement below is true?

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?

Nickel metal can be prepared by the reduction of nickel oxide: NiO(s)+ CO(g)⇌ CO2(g)+ Ni(s) At 936 K,Kp = 4.54 × 103 and at 1125 K,Kp = 1.58 × 103.Which statement is true?

The overall reaction for photosynthesis can be represented by the following equation: 6 CO2(g)+ 6 H2O(l)⇌ C6H12O6(s)+ 6 O2(g) The enthalpy change for this reaction is 2802 kJ.Which of the following changes in condition will shift the equilibrium to the right?

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

The equilibrium constant is equal to 5.00 at 1300 K for the reaction: 2 SO2(g)+ O2(g)⇌ 2 SO3(g). If initial concentrations are [SO2] = 1.20 M,[O2] = 0.45 M,and [SO3] = 1.80 M,the system is

The following pictures represent mixtures of A2B4 molecules and AB2 molecules,which interconvert according to the equation A2B4 ⇌ 2 AB2.If mixture (1)is at equilibrium,which of the other mixtures are also at equilibrium?

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.

At 1000 K,Kp = 19.9 for the reaction Fe2O3(s)+ 3 CO(g)⇌ 2 Fe(s)+ 3 CO2(g).What is the value of Kp for the reaction 2 Fe2O3(s)+ 6 CO(g)⇌ 4 Fe(s)+ 6 CO2(g)?

What is the equilibrium equation for the following reaction? 2 H2O (l)⇌ H3O+ (aq)+ OH- (aq)

Consider the reaction A + B ⇌ 2 AB.The vessel on the right contains an equilibrium mixture of A atoms (shaded spheres),B atoms (unshaded spheres),and AB molecules. -If the barrier between the two vessels is removed and the contents of the two vessels are allowed to mix,what will be observed?

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?

For the reaction: 4 HCl(g)+ O2(g)⇌ 2 Cl2(g)+ 2 H2O(l),the equilibrium constant is 0.063 at 400 K.If the reaction quotient is 0.100,which of the following statements is not correct?

If Kc equals 0.110 at 25°C for the reaction: N2O4(g)⇌ 2 NO2(g),what is Kc for the reaction: 6NO2(g)⇌ 3 N2O4(g)?

For the reaction H2(g)+ S(s)⇌ H2S(g),if the rate constant for the forward reaction is greater than the rate constant for the reverse reaction,the value of Kc must be ________ (equal to,greater than,less than)1.

For the reaction shown below,which change in conditions made to the system at equilibrium will result in a net reaction to the right to form more product? C(s)+ 2 H2(g)⇌ CH4(g)ΔH° = -74.8 kJ

Which statement is true for a reaction with Kc equal to 8.90 × 10-12?

Chemical Tools: Experimentation and Measurement

Atoms, molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solutions

Periodicity and the Electronic Structure of Atoms

Ionic Compounds: Periodic Trends and Bonding

Covalent Bonding and Electron-Dot Structures

Covalent Compounds: Bonding Theories and Molecular Structure

Thermochemistry: Chemical Energy

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

Thermodynamics: Entropy, free Energy, and Equilibrium

Electrochemistry

Nuclear Chemistry

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

The Main-Group Elements

Connections to Organic and Biological Chemistry

Filters

At a certain temperature,hydrogen and iodine react to form hydrogen iodide: H₂(g)+ I₂(g)⇌ 2 HI(g). When initial amounts of H₂,I₂,and HI are mixed,the concentration of HI increases.Which statement below is true?

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?

Nickel metal can be prepared by the reduction of nickel oxide: NiO(s)+ CO(g)⇌ CO₂(g)+ Ni(s) At 936 K,K_p = 4.54 × 10³ and at 1125 K,K_p = 1.58 × 10³.Which statement is true?

The overall reaction for photosynthesis can be represented by the following equation: 6 CO₂(g)+ 6 H₂O(l)⇌ C₆H₁₂O₆(s)+ 6 O₂(g) The enthalpy change for this reaction is 2802 kJ.Which of the following changes in condition will shift the equilibrium to the right?

The equilibrium constant is equal to 5.00 at 1300 K for the reaction: 2 SO₂(g)+ O₂(g)⇌ 2 SO₃(g). If initial concentrations are [SO₂] = 1.20 M,[O₂] = 0.45 M,and [SO₃] = 1.80 M,the system is

The following pictures represent mixtures of A₂B₄ molecules and AB₂ molecules,which interconvert according to the equation A₂B₄ ⇌ 2 AB₂.If mixture (1)is at equilibrium,which of the other mixtures are also at equilibrium?

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.

At 1000 K,K_p = 19.9 for the reaction Fe₂O₃(s)+ 3 CO(g)⇌ 2 Fe(s)+ 3 CO₂(g).What is the value of K_p for the reaction 2 Fe₂O₃(s)+ 6 CO(g)⇌ 4 Fe(s)+ 6 CO₂(g)?

What is the equilibrium equation for the following reaction? 2 H₂O (l)⇌ H₃O⁺ (aq)+ OH^- (aq)

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?

For the reaction: 4 HCl(g)+ O₂(g)⇌ 2 Cl₂(g)+ 2 H₂O(l),the equilibrium constant is 0.063 at 400 K.If the reaction quotient is 0.100,which of the following statements is not correct?

If K_c equals 0.110 at 25°C for the reaction: N₂O₄(g)⇌ 2 NO₂(g),what is K_c for the reaction: 6NO₂(g)⇌ 3 N₂O₄(g)?

For the reaction H₂(g)+ S(s)⇌ H₂S(g),if the rate constant for the forward reaction is greater than the rate constant for the reverse reaction,the value of K_c must be ________ (equal to,greater than,less than)1.

For the reaction shown below,which change in conditions made to the system at equilibrium will result in a net reaction to the right to form more product? C(s)+ 2 H₂(g)⇌ CH₄(g)ΔH° = -74.8 kJ

Which statement is true for a reaction with K_c equal to 8.90 × 10^-12?