# Worksheet: Reaction Quotients and Directions of Change

In this worksheet, we will practice predicting changes in the position of equilibrium by comparing reaction quotients with equilibrium constants.

Q1:

Sulfuryl chloride decomposes reversibly into chlorine and sulfur dioxide, as shown by the equation.

In one gas mixture, = 0.16 M, = 0.13 M, and = 0.075 M. The value of for the reaction is 0.078. In which direction will the reaction shift in order to reach equilibrium?

• ATo the left
• BNeither; it has already reached equilibrium
• CTo the right

Q2:

The reaction shown has at 720 K.

If, at this temperature, a reaction vessel is filled with each gas to the partial pressures listed, in which direction will it shift to reach equilibrium? , , and .

• ATo the right
• BTo the left
• CNeither; it has reached equilibrium

Q3:

Consider the reaction shown, where , , and .

What is the reaction quotient?

• A
• B
• C
• D

In which direction will the reaction proceed from this point?

• ANeither: it has reached equilibrium.
• BTo the left
• CTo the right

Q4:

Consider the reaction shown, where , , , and .

What is the reaction quotient?

• A
• B
• C
• D
• E undefined

In which direction will the reaction proceed from this point?

• ANeither; it has reached equilibrium
• BTo the left
• CTo the right

Q5:

Consider the reaction shown, where , , , and .

What is the reaction quotient?

• A
• B
• C
• D
• E

In which direction will the reaction proceed from this point?

• ATo the right
• BTo the left
• CNeither; it has reached equilibrium

Q6:

Consider the reaction shown, where , , , and .

If the partial pressures of all species are 1.0 atm under standard conditions, what is the reaction quotient for this reaction to two significant figures?

• A
• B
• C
• D
• E

In which direction will the reaction proceed from this point?

• ATo the left
• BNeither; it has reached equilibrium
• CTo the right

Q7:

Consider the reaction shown, where , , , and .

If the concentrations of all species are 1.00 M under standard conditions, what is the reaction quotient for this reaction?

• A
• B
• C
• D
• E

In which direction will the reaction proceed from this point?

• ANeither; it has reached equilibrium
• BTo the left
• CTo the right

Q8:

For the reaction initial concentrations of the species are:

• ,
• ,
• ,
• .

In which direction does the reaction shift in order to reach equilibrium?

• ATo the left
• BNeither; the reaction is already at equilibrium
• CTo the right

Q9:

One of the important reactions in the formation of smog is represented by the following equation. In which direction does the reaction shift in order to reach equilibrium?

• ATo the left
• BTo the right
• CNeither; the reaction is already at equilibrium

Q10:

The initial concentrations of the species in a solution are as follows: = 0.0094 M, = 0.0025 M, = 0.0015 M, and = 0.0076 M. These species participate in a reversible reaction represented by the following equation. In which direction does the reaction shift in order to reach equilibrium?

• ATo the left
• BTo the right
• CNeither; the reaction is already at equilibrium

Q11:

An equilibrium is established according to the following equation.

What will happen in a solution that is 0.20 M each in , , , , and ?

• A will be reduced and oxidized.
• B will be oxidized and reduced.
• C will be oxidized and reduced.
• D will be reduced and oxidized.
• EThere will be no change because all reactants and products have an activity of 1.

Q12:

One of the solubility rules is that all chlorides are soluble except , , , and .

Which of the following expressions correctly describes the equilibrium constant, , for the equilibrium shown?

• A
• B
• C
• D
• E

Q13:

Benzene is one of the compounds used as octane enhancers in unleaded gasoline. It is manufactured by the catalytic conversion of acetylene to benzene.

Which value of would make this reaction most useful commercially?

• A
• B
• C
• D
• E

Q14:

One of the solubility rules is that all chlorides are soluble except , , , and .

Which of the following expressions correctly describes the equilibrium constant, , for the equilibrium shown?

• A
• B
• C
• D
• E