Introduction to Equilibria

Equilibrium for 2CrO₄^2- + 2H⁺→Cr₂O₇^2- + H₂O. What happens when OH^- ions are added to the system?

• Position of equilibrium will shift to right

• Color of system will turn from orange to yellow

• K_c will decrease

• OH^- ions will not react, and thus no change is seen.

Tags

NGSS.HS-PS1-5

Given the K_c for a forward reaction, how can you find K_c for the reverse reaction?

• Divide K_c by 1

• Divide 1 by K_c

• Square K_c

• Take the square root of K_c

This endothermic reaction is at equilibrium.

If its temperature is increased (at constant volume and pressure), which way will the equilibrium shift?

• To products (right)

• To reactants (left)

Tags

NGSS.HS-PS1-5

Le Chatelier's Principle states that if a chemical system at equilibrium is stressed,

• the system will adjust to increase the stress
• the system will adjust to reduce the stress
• the system will not adjust

Tags

NGSS.HS-PS1-6

This symbol indicates that a reaction is ____________

• reversible
• irreversible

Tags

NGSS.HS-PS1-6

When the rate of the forward reaction is equal to the rate of backward reaction, the system is said to be in

• Chemical Equilibrium
• Chemical Balance
• Stoichiometry
• Chemical Reaction

Tags

NGSS.HS-PS1-6

For the reaction...

SO₂ + O₂ <−> SO₃

If the concentration of SO₂ is increased, the system will shift ___________.

• left

• right

• left and right

• neither left nor right

Tags

NGSS.HS-PS1-5

For the reaction...

heat + N₂ + O₂ ↔ 2NO

If heat is added to the chemical system, the system will shift _______.

• left

• right

• left and right

• neither left nor right

Tags

NGSS.HS-PS1-5

2SO₂ (g) + O₂ (g) ⇌ 2SO₃ (g)

Decreasing the volume of container will

• shift the system right

• shift the system left

• change K

• have no effect

2SO₂ (g) + O₂ (g) ⇌ 2SO₃ (g)

Using a catalyst will...

• shift the system right

• shift the system left

• increase the rate of reaction

• have no effect