10-5 LeChatelier's Principle

Given the equation representing a solution equilibrium:

BaSO₄(s) ⇌ Ba²⁺(aq) + SO₄^2-(aq),

what occurs when Na₂SO₄(aq) is added to this system, increasing the concentration of SO₄^2-(aq)?

• The equilibrium shifts to the left, and the concentration of Ba²⁺(aq) decreases.

• The equilibrium shifts to the left, and the concentration of Ba²⁺(aq) increases.

• The equilibrium shifts to the right, and the concentration of Ba²⁺(aq) decreases.

• The equilibrium shifts to the right, and the concentration of Ba²⁺(aq) increases.

Tags

NGSS.HS-PS1-5

Given the equation representing a system at equilibrium in a sealed, rigid container:

2HI(g) ⇌ H₂(g) + I₂(g) + energy

increasing the temperature of the system causes the concentration of

• HI to increase

• HI to decrease

• HI to remain constant

• I2 to remain constant

Tags

NGSS.HS-PS1-5

Given the equation representing a system at equilibrium:

PCl₅(g) + energy ⇌ PCl₃(g) + Cl₂(g)

which change will cause the equilibrium to shift to the right?

• adding a catalyst

• adding more PCl₃(g)

• increasing the pressure

• increasing the temperature

Tags

NGSS.HS-PS1-5

Which term identifies a factor that will shift a chemical equilibrium?

• atomic radius

• catalyst

• decay mode

• temperature

Tags

NGSS.HS-PS1-6

Given the equation representing a chemical reaction at equilibrium in a sealed, rigid container:

H₂(g) + I₂(g) + energy ⇌ 2HI(g)

when the concentration of H₂(g) is increased by adding more hydrogen gas to the container at constant temperature, the equilibrium shifts

• to the right, and the concentration of HI(g) decreases

• to the right, and the concentration of HI(g) increases

• to the left, and the concentration of HI(g) decreases

• to the left, and the concentration of HI(g) increases

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

Given the equation representing a system at equilibrium:

KNO₃(s) + energy ⇌ K⁺(aq) + NO₃^-(aq)

which change causes the equilibrium to shift?

• increasing pressure

• increasing temperature

• adding a noble gas

• adding a catalyst

Tags

NGSS.HS-PS1-6

Given the equation for a system at equilibrium:

N₂(g) + 3H₂(g) ⇌ 2NH₃(g) + energy

if only the concentration of N₂(g) is increased, the concentration of

• NH₃(g) increases

• NH₃(g) remains the same

• H₂(g) increases

• H₂(g) remains the same

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

Given the equation representing a system at equilibrium:

N₂(g) + 3H₂(g) ⇌ 2NH₃(g) + energy

which changes occur when the temperature of this system is decreased?

• The concentration of H₂(g) increases and the concentration of N₂(g) increases.

• The concentration of H₂(g) decreases and the concentration of N₂(g) increases.

• The concentration of H₂(g) decreases and the concentration of NH₃(g) decreases.

• The concentration of H₂(g) decreases and the concentration of NH₃(g) increases.

Tags

NGSS.HS-PS1-5

Given the equation representing a reaction at equilibrium:

H₂(g) + I₂(g) + heat ⇌ 2HI(g)

which change favors the reverse reaction?

• decreasing the concentration of HI(g)

• decreasing the temperature

• increasing the concentration of I₂(g)

• increasing the pressure

Tags

NGSS.HS-PS1-6

Given the reaction at equilibrium:

N₂(g) + O₂(g) + energy ⇌ 2NO(g)

which change will result in a decrease in the amount of NO(g) formed?

• decreasing the pressure

• decreasing the concentration of N₂(g)

• increasing the concentration of O₂(g)

• increasing the temperature

Tags

NGSS.HS-PS1-5