Question 1

If the reaction quotient is less than the equilibrium constant, which statement would be correct?

Accepted Answer

A)  If Q < K, then the reaction needs to proceed towards the left to reach equilibrium. 
B)  If Q < K, then the reaction is at equilibrium. 
C)  If Q < K, then the reaction needs to proceed towards the right to reach equilibrium. 
A)  If Q < K, then the reaction needs to proceed towards the left to reach equilibrium. 
B)  If Q < K, then the reaction is at equilibrium. 
C)  If Q < K, then the reaction needs to proceed towards the right to reach equilibrium. C

Question 2

Write the equilibrium expression for H2Og) + COg) ⇌ H2g) + CO2g).

Accepted Answer

A)  Kc = [CO2] [H2] / [H2O] [CO] 
B)  Kc = [H2O] [CO] / [CO2] [H2] 
C)  Kc = [CO2] [H2] / [CO] 
A)  Kc = [CO2] [H2] / [H2O] [CO] 
B)  Kc = [H2O] [CO] / [CO2] [H2] 
C)  Kc = [CO2] [H2] / [CO] A

Question 3

Write the equilibrium expression for 2NOg) + 2H2g) ⇌ N2g) + 2H2Og).

Accepted Answer

A)  Kc = [NO]2 [H2]2 / [H2O]2 [N2] 
B)  Kc = [H2O]2 [N2] / [NO]2 [H2]2 
C)  Kc = [N2] / [NO]2 [H2]2  
A)  Kc = [NO]2 [H2]2 / [H2O]2 [N2] 
B)  Kc = [H2O]2 [N2] / [NO]2 [H2]2 
C)  Kc = [N2] / [NO]2 [H2]2  B

Question 4

Consider the following equilibrium mixture in a closed system: H2Og) + COg) ⇌ H2g) + CO2g). Explain what would happen to the equilibrium upon the addition of hydrogen gas?

Accepted Answer

A)  The addition of hydrogen gas would disrupt the equilibrium causing it to shift towards the left which would result in more reactants being produced until equilibrium is achieved. 
B)  The addition of hydrogen gas would disrupt the equilibrium causing it to shift towards the right which would result in more CO2 being produced until equilibrium is achieved. 
C)  The addition of hydrogen gas would not disrupt the equilibrium, so nothing would happen. 
A)  The addition of hydrogen gas would disrupt the equilibrium causing it to shift towards the left which would result in more reactants being produced until equilibrium is achieved. 
B)  The addition of hydrogen gas would disrupt the equilibrium causing it to shift towards the right which would result in more CO2 being produced until equilibrium is achieved. 
C)  The addition of hydrogen gas would not disrupt the equilibrium, so nothing would happen.

Question 5

If the reaction quotient is greater than the equilibrium constant, which statement would be correct?

Accepted Answer

A)  If Q > K, then the reaction needs to proceed towards the right to reach equilibrium. 
B)  If Q > K, then the reaction needs to proceed towards the left to reach equilibrium. 
C)  If Q > K, then the reaction is at equilibrium. 
A)  If Q > K, then the reaction needs to proceed towards the right to reach equilibrium. 
B)  If Q > K, then the reaction needs to proceed towards the left to reach equilibrium. 
C)  If Q > K, then the reaction is at equilibrium.

Question 6

Consider the following equilibrium mixture in a closed system: H2Og) + COg) ⇌ H2g) + CO2g). Explain what would happen to the equilibrium upon the addition of carbon monoxide gas?

Accepted Answer

A)  The addition of carbon monoxide gas would disrupt the equilibrium causing it to shift towards the left which would result in more reactants being produced until equilibrium is achieved. 
B)  The addition of carbon monoxide gas would not disrupt the equilibrium, so nothing would happen. 
C)  The addition of carbon monoxide gas would disrupt the equilibrium causing it to shift towards the right which would result in more products being produced until equilibrium is achieved. 
A)  The addition of carbon monoxide gas would disrupt the equilibrium causing it to shift towards the left which would result in more reactants being produced until equilibrium is achieved. 
B)  The addition of carbon monoxide gas would not disrupt the equilibrium, so nothing would happen. 
C)  The addition of carbon monoxide gas would disrupt the equilibrium causing it to shift towards the right which would result in more products being produced until equilibrium is achieved.

Question 7

The Kc for the formation of HI from iodine and hydrogen gas is 54. If the concentrations of HI, I2, and H2 are 0.338 M, 0.112 M, and 0.198 M respectively, which statement is correct?

Accepted Answer

A)  Q = 5.15 which is less than Kc, therefore the reaction needs to proceed towards the right to reach equilibrium 
B)  Q = 15.2 which is less than Kc, therefore the reaction needs to proceed towards the right to reach equilibrium 
C)  Q = 0.194 which is less than Kc, therefore the reaction needs to proceed towards the right to reach equilibrium 
A)  Q = 5.15 which is less than Kc, therefore the reaction needs to proceed towards the right to reach equilibrium 
B)  Q = 15.2 which is less than Kc, therefore the reaction needs to proceed towards the right to reach equilibrium 
C)  Q = 0.194 which is less than Kc, therefore the reaction needs to proceed towards the right to reach equilibrium

If the reaction quotient is less than the equilibrium constant, which statement would be correct?

Write the equilibrium expression for H₂Og) + COg) ⇌ H₂g) + CO₂g).

Write the equilibrium expression for 2NOg) + 2H₂g) ⇌ N₂g) + 2H₂Og).

Consider the following equilibrium mixture in a closed system: H₂Og) + COg) ⇌ H₂g) + CO₂g). Explain what would happen to the equilibrium upon the addition of hydrogen gas?

If the reaction quotient is greater than the equilibrium constant, which statement would be correct?

Consider the following equilibrium mixture in a closed system: H₂Og) + COg) ⇌ H₂g) + CO₂g). Explain what would happen to the equilibrium upon the addition of carbon monoxide gas?

The K_c for the formation of HI from iodine and hydrogen gas is 54. If the concentrations of HI, I₂, and H₂ are 0.338 M, 0.112 M, and 0.198 M respectively, which statement is correct?

Essential Ideas

Atoms, Molecules, and Ions

Composition of Substances and Solutions

Stoichiometry of Chemical Reactions

Thermochemistry

Electronic Structure and Periodic Properties of Elements

Chemical Bonding and Molecular Geometry

Advanced Theories of Covalent Bonding

Gases

Liquids and Solids

Solutions and Colloids

Kinetics

Acid-Base Equilibria

Thermodynamics

Electrochemistry

Representative Metals, Metalloids, and Nonmetals

Organic Chemistry

Nuclear Chemistry

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Exam 13: Fundamental Equilibrium Concepts

If the reaction quotient is less than the equilibrium constant, which statement would be correct?

Write the equilibrium expression for H2Og) + COg) ⇌ H2g) + CO2g).

Write the equilibrium expression for 2NOg) + 2H2g) ⇌ N2g) + 2H2Og).

Consider the following equilibrium mixture in a closed system: H2Og) + COg) ⇌ H2g) + CO2g). Explain what would happen to the equilibrium upon the addition of hydrogen gas?

If the reaction quotient is greater than the equilibrium constant, which statement would be correct?

Consider the following equilibrium mixture in a closed system: H2Og) + COg) ⇌ H2g) + CO2g). Explain what would happen to the equilibrium upon the addition of carbon monoxide gas?

The Kc for the formation of HI from iodine and hydrogen gas is 54. If the concentrations of HI, I2, and H2 are 0.338 M, 0.112 M, and 0.198 M respectively, which statement is correct?

Essential Ideas

Atoms, Molecules, and Ions

Composition of Substances and Solutions

Stoichiometry of Chemical Reactions

Thermochemistry

Electronic Structure and Periodic Properties of Elements

Chemical Bonding and Molecular Geometry

Advanced Theories of Covalent Bonding

Gases

Liquids and Solids

Solutions and Colloids

Kinetics

Acid-Base Equilibria

Thermodynamics

Electrochemistry

Representative Metals, Metalloids, and Nonmetals

Organic Chemistry

Nuclear Chemistry

Filters

Write the equilibrium expression for H₂Og) + COg) ⇌ H₂g) + CO₂g).

Write the equilibrium expression for 2NOg) + 2H₂g) ⇌ N₂g) + 2H₂Og).

Consider the following equilibrium mixture in a closed system: H₂Og) + COg) ⇌ H₂g) + CO₂g). Explain what would happen to the equilibrium upon the addition of hydrogen gas?

Consider the following equilibrium mixture in a closed system: H₂Og) + COg) ⇌ H₂g) + CO₂g). Explain what would happen to the equilibrium upon the addition of carbon monoxide gas?

The K_c for the formation of HI from iodine and hydrogen gas is 54. If the concentrations of HI, I₂, and H₂ are 0.338 M, 0.112 M, and 0.198 M respectively, which statement is correct?