Magnesium carbonate dissociates to magnesium oxide and carbon dioxide at elevated temperatures. MgCO3(s) ⇄ MgO(s) + CO2(g) A reaction vessel contains these compounds in equilibrium at 300°C. What will happen if the volume of the container is reduced by 25% at 300°C?

A) The partial pressure of carbon dioxide present at equilibrium will increase. B) The partial pressure of carbon dioxide present at equilibrium will decrease. C) The partial pressure of carbon dioxide at equilibrium will be unchanged. D) The equilibrium constant will have to decrease to compensate for the decrease in volume. E) More information is needed in order to make a valid judgment. A) The partial pressure of carbon dioxide present at equilibrium will increase. B) The partial pressure of carbon dioxide present at equilibrium will decrease. C) The partial pressure of carbon dioxide at equilibrium will be unchanged. D) The equilibrium constant will have to decrease to compensate for the decrease in volume. E) More information is needed in order to make a valid judgment.

The following reaction is at equilibrium in a closed container. CuSO4.5H2O(s) ⇄ CuSO4(s) + 5H2O(g) Which, if any, of the following actions will lead to an increase in the pressure of H2O present at equilibrium?

A) Increasing the volume of the container B) Decreasing the volume of the container C) Adding a catalyst D) Removing some solid CuSO 4 E) None of these choices are correct. A) Increasing the volume of the container B) Decreasing the volume of the container C) Adding a catalyst D) Removing some solid CuSO 4 E) None of these choices are correct.

Hydrogen sulfide will react with water as shown in the following reactions. H2S(g) + H2O(l) ⇄ H3O+(aq) + HS−(aq) K1 = 1.0 × 10−7 HS−(aq) + H2O(l) ⇄ H3O+(aq) + S2−(aq) K2 = ? H2S(g) + 2H2O(l) ⇄ 2H3O+(aq) + S2−(aq) K3 = 1.3 × 10−20 What is the value of K2?

A) 1.3 × 10 −27 B) 2.3 × 10 −7 C) 1.3 × 10 −13 D) 7.7 × 10 12 E) 7.7 × 10 26 A) 1.3 × 10 −27 B) 2.3 × 10 −7 C) 1.3 × 10 −13 D) 7.7 × 10 12 E) 7.7 × 10 26

Ethane can be formed by reacting acetylene with hydrogen. C2H2(g) + 2H2(g) ⇄ C2H6(g) ΔH°rxn = −311 kJ Under which reaction conditions would you expect to have the greatest equilibrium yield of ethane?

A) High temperature, high pressure B) Low temperature, high pressure C) High temperature, low pressure D) Low temperature, low pressure E) None of these choices are correct. A) High temperature, high pressure B) Low temperature, high pressure C) High temperature, low pressure D) Low temperature, low pressure E) None of these choices are correct.

Exam 17: Equilibrium: the Extent of Chemical Reactions

A chemical reaction has an equilibrium constant of 2 × 10⁶. If this reaction is at equilibrium, select the one correct conclusion that can be made about the reaction.

(Multiple Choice)

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Question 21

Write the mass-action expression, Q_c, for the following chemical reaction. Fe³⁺(aq) + 3OH⁻(aq) ⇄ Fe(OH)₃(s)

(Multiple Choice)

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Question 22

A mixture of 0.500 mole of carbon monoxide and 0.400 mole of bromine was placed into a rigid 1.00-L container and the system was allowed to come to equilibrium. The equilibrium concentration of COBr₂was 0.233 M. What is the value of K_c for this reaction? CO(g) + Br₂(g) ⇄ COBr₂(g)

(Multiple Choice)

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Question 23

The following reaction, in CCl₄ solvent, has been studied at 25°C. 2BrCl ⇄ Br₂ + Cl₂ The equilibrium constant K_c is known to be 0.141. If the initial concentration of chlorine is 0.0300 M and of bromine monochloride is 0.0200 M, what is the equilibrium concentration of bromine?

(Multiple Choice)

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Question 24

The reaction system POCl₃(g) ⇄ POCl(g) + Cl₂(g) Is at equilibrium. Which of the following statements describes the behavior of the system if the partial pressure of chlorine is reduced by 50%?

(Multiple Choice)

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Question 25

There is a direct correlation between the speed of a reaction and its equilibrium constant.

(True/False)

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Question 26

The equilibrium constant for reaction (1) below is 276. Under the same conditions, what is the equilibrium constant of reaction (2)? (1) ½X₂(g) + ½Y₂(g) ⇄ XY(g) (2) 2XY(g) ⇄ X₂(g) + Y₂(g)

(Multiple Choice)

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Question 27

Write the mass-action expression, Q_c, for the following chemical reaction. NO(g) + ½Br₂(g) ⇄ NOBr(g)

(Multiple Choice)

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Question 28

SO₂ reacts with O₂ to produce SO₃. If 86.0 g of SO₂ is placed in a reaction vessel along with excess oxygen gas, how many moles of SO₂ remain when 50.0 g of SO₃ have been formed?

(Multiple Choice)

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Question 29

Ammonium iodide dissociates reversibly to ammonia and hydrogen iodide. NH₄I(s) ⇄ NH₃(g) + HI(g) At 400°C, K_p = 0.215. Calculate the partial pressure of ammonia at equilibrium when a sufficient quantity of ammonium iodide is heated to 400°C.

(Multiple Choice)

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Question 30

A good catalyst for a reaction will speed up the forward reaction and slow down the reverse reaction.

(True/False)

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Question 31

Magnesium carbonate dissociates to magnesium oxide and carbon dioxide at elevated temperatures. MgCO₃(s) ⇄ MgO(s) + CO₂(g) A reaction vessel contains these compounds in equilibrium at 300°C. What will happen if the volume of the container is reduced by 25% at 300°C?

(Multiple Choice)

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Question 32

A container was charged with hydrogen, nitrogen, and ammonia gases at 120°C and the system was allowed to reach equilibrium. What will happen if the volume of the container is increased at constant temperature? 3H₂(g) + N₂(g) ⇄ 2NH₃(g)

(Multiple Choice)

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Question 33

The following reaction is at equilibrium in a closed container. CuSO₄.5H₂O(s) ⇄ CuSO₄(s) + 5H₂O(g) Which, if any, of the following actions will lead to an increase in the pressure of H₂O present at equilibrium?

(Multiple Choice)

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Question 34

Hydrogen sulfide will react with water as shown in the following reactions. H₂S(g) + H₂O(l) ⇄ H₃O⁺(aq) + HS⁻(aq) K₁= 1.0 × 10⁻⁷ HS⁻(aq) + H₂O(l) ⇄ H₃O⁺(aq) + S²⁻(aq) K₂= ? H₂S(g) + 2H₂O(l) ⇄ 2H₃O⁺(aq) + S²⁻(aq) K₃= 1.3 × 10⁻²⁰ What is the value of K₂?

(Multiple Choice)

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Question 35

The equilibrium constant K_c for the reaction A(g) + B(g) ⇄ C(g) Is 0.76 at 150°C. If 0.800 mol of A is added to 0.600 mol of B in a 1.00-L container at 150°C, what will be the equilibrium concentration of C?

(Multiple Choice)

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Question 36

Write the mass-action expression, Q_c, for the following chemical reaction. Sn²⁺(aq) + ½O₂(g) + 3H₂O(l) ⇄ SnO₂(s) + 2H₃O⁺(aq)

(Multiple Choice)

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Question 37

Ethane can be formed by reacting acetylene with hydrogen. C₂H₂(g) + 2H₂(g) ⇄ C₂H₆(g) ΔH°_rxn = −311 kJ Under which reaction conditions would you expect to have the greatest equilibrium yield of ethane?

(Multiple Choice)

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Question 38

The equilibrium constant, K_p, for the reaction H₂(g) + I₂(g) ⇄ 2HI(g) Is 55.2 at 425°C. A rigid cylinder at that temperature contains 0.127 atm of hydrogen, 0.134 atm of iodine, and 1.055 atm of hydrogen iodide. Is the system at equilibrium?

(Multiple Choice)

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Question 39

For a solution equilibrium, a change in concentration of a reactant or product does not change K_c.

(True/False)

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Question 40

Showing 21 - 40 of 98

Exam 17: Equilibrium: the Extent of Chemical Reactions

A chemical reaction has an equilibrium constant of 2 × 106. If this reaction is at equilibrium, select the one correct conclusion that can be made about the reaction.

Write the mass-action expression, Qc, for the following chemical reaction. Fe3+(aq) + 3OH−(aq) ⇄ Fe(OH)3(s)

A mixture of 0.500 mole of carbon monoxide and 0.400 mole of bromine was placed into a rigid 1.00-L container and the system was allowed to come to equilibrium. The equilibrium concentration of COBr2 was 0.233 M. What is the value of Kc for this reaction? CO(g) + Br2(g) ⇄ COBr2(g)

The following reaction, in CCl4 solvent, has been studied at 25°C. 2BrCl ⇄ Br2 + Cl2 The equilibrium constant Kc is known to be 0.141. If the initial concentration of chlorine is 0.0300 M and of bromine monochloride is 0.0200 M, what is the equilibrium concentration of bromine?

The reaction system POCl3(g) ⇄ POCl(g) + Cl2(g) Is at equilibrium. Which of the following statements describes the behavior of the system if the partial pressure of chlorine is reduced by 50%?

There is a direct correlation between the speed of a reaction and its equilibrium constant.

The equilibrium constant for reaction (1) below is 276. Under the same conditions, what is the equilibrium constant of reaction (2)? (1) ½X2(g) + ½Y2(g) ⇄ XY(g) (2) 2XY(g) ⇄ X2(g) + Y2(g)

Write the mass-action expression, Qc, for the following chemical reaction. NO(g) + ½Br2(g) ⇄ NOBr(g)

SO2 reacts with O2 to produce SO3. If 86.0 g of SO2 is placed in a reaction vessel along with excess oxygen gas, how many moles of SO2 remain when 50.0 g of SO3 have been formed?

Ammonium iodide dissociates reversibly to ammonia and hydrogen iodide. NH4I(s) ⇄ NH3(g) + HI(g) At 400°C, Kp = 0.215. Calculate the partial pressure of ammonia at equilibrium when a sufficient quantity of ammonium iodide is heated to 400°C.

A good catalyst for a reaction will speed up the forward reaction and slow down the reverse reaction.

Magnesium carbonate dissociates to magnesium oxide and carbon dioxide at elevated temperatures. MgCO3(s) ⇄ MgO(s) + CO2(g) A reaction vessel contains these compounds in equilibrium at 300°C. What will happen if the volume of the container is reduced by 25% at 300°C?

A container was charged with hydrogen, nitrogen, and ammonia gases at 120°C and the system was allowed to reach equilibrium. What will happen if the volume of the container is increased at constant temperature? 3H2(g) + N2(g) ⇄ 2NH3(g)

The following reaction is at equilibrium in a closed container. CuSO4.5H2O(s) ⇄ CuSO4(s) + 5H2O(g) Which, if any, of the following actions will lead to an increase in the pressure of H2O present at equilibrium?

Hydrogen sulfide will react with water as shown in the following reactions. H2S(g) + H2O(l) ⇄ H3O+(aq) + HS−(aq) K1 = 1.0 × 10−7 HS−(aq) + H2O(l) ⇄ H3O+(aq) + S2−(aq) K2 = ? H2S(g) + 2H2O(l) ⇄ 2H3O+(aq) + S2−(aq) K3 = 1.3 × 10−20 What is the value of K2?

The equilibrium constant Kc for the reaction A(g) + B(g) ⇄ C(g) Is 0.76 at 150°C. If 0.800 mol of A is added to 0.600 mol of B in a 1.00-L container at 150°C, what will be the equilibrium concentration of C?

Write the mass-action expression, Qc, for the following chemical reaction. Sn2+(aq) + ½O2(g) + 3H2O(l) ⇄ SnO2(s) + 2H3O+(aq)

Ethane can be formed by reacting acetylene with hydrogen. C2H2(g) + 2H2(g) ⇄ C2H6(g) ΔH°rxn = −311 kJ Under which reaction conditions would you expect to have the greatest equilibrium yield of ethane?

The equilibrium constant, Kp, for the reaction H2(g) + I2(g) ⇄ 2HI(g) Is 55.2 at 425°C. A rigid cylinder at that temperature contains 0.127 atm of hydrogen, 0.134 atm of iodine, and 1.055 atm of hydrogen iodide. Is the system at equilibrium?

For a solution equilibrium, a change in concentration of a reactant or product does not change Kc.

Keys to the Study of Chemistry: Definitions, Units, and Problem Solving

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, Free Energy, and Reaction Direction

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

A chemical reaction has an equilibrium constant of 2 × 10⁶. If this reaction is at equilibrium, select the one correct conclusion that can be made about the reaction.

Write the mass-action expression, Q_c, for the following chemical reaction. Fe³⁺(aq) + 3OH⁻(aq) ⇄ Fe(OH)₃(s)

A mixture of 0.500 mole of carbon monoxide and 0.400 mole of bromine was placed into a rigid 1.00-L container and the system was allowed to come to equilibrium. The equilibrium concentration of COBr₂was 0.233 M. What is the value of K_c for this reaction? CO(g) + Br₂(g) ⇄ COBr₂(g)

The following reaction, in CCl₄ solvent, has been studied at 25°C. 2BrCl ⇄ Br₂ + Cl₂ The equilibrium constant K_c is known to be 0.141. If the initial concentration of chlorine is 0.0300 M and of bromine monochloride is 0.0200 M, what is the equilibrium concentration of bromine?

The reaction system POCl₃(g) ⇄ POCl(g) + Cl₂(g) Is at equilibrium. Which of the following statements describes the behavior of the system if the partial pressure of chlorine is reduced by 50%?

The equilibrium constant for reaction (1) below is 276. Under the same conditions, what is the equilibrium constant of reaction (2)? (1) ½X₂(g) + ½Y₂(g) ⇄ XY(g) (2) 2XY(g) ⇄ X₂(g) + Y₂(g)

Write the mass-action expression, Q_c, for the following chemical reaction. NO(g) + ½Br₂(g) ⇄ NOBr(g)

SO₂ reacts with O₂ to produce SO₃. If 86.0 g of SO₂ is placed in a reaction vessel along with excess oxygen gas, how many moles of SO₂ remain when 50.0 g of SO₃ have been formed?

Ammonium iodide dissociates reversibly to ammonia and hydrogen iodide. NH₄I(s) ⇄ NH₃(g) + HI(g) At 400°C, K_p = 0.215. Calculate the partial pressure of ammonia at equilibrium when a sufficient quantity of ammonium iodide is heated to 400°C.

Magnesium carbonate dissociates to magnesium oxide and carbon dioxide at elevated temperatures. MgCO₃(s) ⇄ MgO(s) + CO₂(g) A reaction vessel contains these compounds in equilibrium at 300°C. What will happen if the volume of the container is reduced by 25% at 300°C?

A container was charged with hydrogen, nitrogen, and ammonia gases at 120°C and the system was allowed to reach equilibrium. What will happen if the volume of the container is increased at constant temperature? 3H₂(g) + N₂(g) ⇄ 2NH₃(g)

The following reaction is at equilibrium in a closed container. CuSO₄.5H₂O(s) ⇄ CuSO₄(s) + 5H₂O(g) Which, if any, of the following actions will lead to an increase in the pressure of H₂O present at equilibrium?

The equilibrium constant K_c for the reaction A(g) + B(g) ⇄ C(g) Is 0.76 at 150°C. If 0.800 mol of A is added to 0.600 mol of B in a 1.00-L container at 150°C, what will be the equilibrium concentration of C?

Write the mass-action expression, Q_c, for the following chemical reaction. Sn²⁺(aq) + ½O₂(g) + 3H₂O(l) ⇄ SnO₂(s) + 2H₃O⁺(aq)

Ethane can be formed by reacting acetylene with hydrogen. C₂H₂(g) + 2H₂(g) ⇄ C₂H₆(g) ΔH°_rxn = −311 kJ Under which reaction conditions would you expect to have the greatest equilibrium yield of ethane?

The equilibrium constant, K_p, for the reaction H₂(g) + I₂(g) ⇄ 2HI(g) Is 55.2 at 425°C. A rigid cylinder at that temperature contains 0.127 atm of hydrogen, 0.134 atm of iodine, and 1.055 atm of hydrogen iodide. Is the system at equilibrium?

For a solution equilibrium, a change in concentration of a reactant or product does not change K_c.