# Worksheet: Predicting Concentration Changes from Reaction Quotients

Q1:

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

• A
• B
• C
• D
• E

Q2:

For the reaction , where , P() = 1.00 atm, P() = 1.00 atm, and P() = 1.00 atm:

What is the reaction quotient?

• A
• B
• C
• D
• E

In which direction will the reaction proceed from this point?

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

Q3:

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

• ANeither: the reaction is already at equilibrium.
• BTo the left
• CTo the right

Q4:

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

Q5:

For the reaction , where , = 10.0 atm, and = = 5 atm.

What is the reaction quotient?

• A
• B
• C
• D

In which direction will the reaction proceed from this point?

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

Q6:

The following reaction 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? = 93 atm, = 48 atm, and = 52 atm.

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

Q7:

For the reaction , , = 3.0 atm, = 2.0 atm, and = 1.0 atm.

If the partial pressures of all species are 1.0 atm 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?

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

Q8:

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.

Q9:

The initial concentrations of the species in a solution are as follows: = 0.011 M, = 0.0011 M, = 0.037 M, and = 0.046 M. These species participate in a reversible reaction represented by the equation: In which direction does the reaction shift in order to reach equilibrium?

• ANeither: the reaction is already at equilibrium.
• BTo the right
• CTo the left

Q10:

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

• A
• B
• C
• D
• E

Q11:

For the reaction , where , = 1.00 M, = 1.00 M, and = 0 M:

What is the reaction quotient?

• A
• B undefined
• C
• D
• E

In which direction will the reaction proceed from this point?

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

Q12:

For the reaction initial concentrations of the species are:

• = 0.0203 M,
• = 0.0203 M,
• = 0.0040 M,
• = 0.0040 M.

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

• ANeither: the reaction is already at equilibrium.
• BTo the left
• CTo the right

Q13:

For the reaction , , = 0.20 M, = 1.00 M, and = 1.00 M.

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?

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

Q14:

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

= 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?

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