Unit 7 Equilibrium

After the equilibrium represented above is established, some pure O₂ (g) is injected into the reaction vessel at a constant temperature. After equilibrium is reestablished, which of the following has a lower value compared to its value at the original equilibrium?

• Keq for the reaction.

• The total pressure in the reaction vessel.

• The amount of SO₃ (g) in the reaction vessel.

• The amount of O₂ (g) in the reaction vessel.

• The amount of SO₂ (g) in the reaction vessel.

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

Which of the following changes alone would cause a decrease in the value of Keq for the reaction represented above?

• Decreasing the temperature.

• Increasing the temperature.

• Decreasing the volume of the reaction vessel.

• Increasing the volume of the reaction vessel.

• Adding a catalyst

Tags

NGSS.HS-PS1-5

Which of the following compounds is NOT appreciably soluble in water but is soluble in dilute hydrochloric acid?

• Mg(OH)₂ (s)

• (NH₄)₂CO₃ (s)

• CuSO₄ (s)

• (NH₄)₂SO₄ (s)

• Sr(NO₃)₂ (s)

What is the molar solubility in water of Ag₂CrO₄?

• 8 x 10^-12 M

• 2 x 10^-12 M

In a qualitative analysis for the presence of Pb²⁺, Fe²⁺, and Cu²⁺ ions in an aqueous solution, which of the following will allow the separation of Pb2+ from the other ions at room temperature?

• Adding dilute Na₂S (aq) solution.

• Adding dilute HCl(aq) solution

• Adding dilute NaOH(aq) solution

• Adding dilute NH₃(aq) solution

• Adding dilute HNO₃(aq) solution

On the basis of the solubility curves shown above, the greatest percentage of which compound can be recovered by cooling a saturated solution of that compound from 90^oC to 30^oC?

• NaCl

• KNO₃

• K₂CrO₄

• K₂SO₄

• Se₂(SO₄)₃

In a saturated solution of Zn(OH)₂ at 25^oC, the value of [OH^-] is 2.0 x 10^-6 M. What is the value of the solubility product constant, Ksp, for Zn(OH)₂ at 25^oC?

• 4.0 x 10^-18

• 8.0 x 10^-18

• 1.6 x 10^-17

• 4.0 x 10^-12

• 2.0 x 10^-6

• I only

• III only

• I and II only

• II and III only

• I, II, and III

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

The reaction mixture represented above is at equilibrium at 298K, and the molar concentrations are [X] = 2.0 M, [Y] = 0.5 M, and [Z] = 4.0 M. What is the value of the equilibrium constant for the reaction at 298K?

• 0.50

• 2.0

• 4.0

• 16

• 32

Tags

NGSS.HS-PS1-7

The diagram above represents a mixture of NO₂(g) and N₂O₄(g) in a 1.0 L container at a given temperature. The two gases are in equilibrium according to the equation 2NO₂(g) ↔ N₂O₄(g). Which of the following must be true about the value of the equilibrium constant for the reaction at this temperature?

• K = 0

• 0 < K < 1

• K = 1

• K > 1

• There is not enough information to determine the relative value of K.