equilibrium

What are the two factors that help determine that equilibrium is reached?

• Forward reaction rate is faster than the reverse and the concentrations are equal

• Forward and reverse reaction rates are equal and concentrations are equal

• Forward and reverse reaction rates are equal and concentrations are constant

For the reaction...

SO₂ + O₂ ⇌ SO₃

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

• left

• right

• left and right

• neither left or right

For the reaction...

SO₂ + O₂ <−> SO₃

If the equilibrium shifts to the right, the concentration of O₂ will ___________.

• increase

• decrease

• double

• stay the same

2SO₂(g)+O₂(g)⇌2SO₃(g)
Removing O₂(g) will

• shift equilibrium right
• shift equilibrium left
• decrease temperature
• have no change

2SO₂(g)+O₂(g)⇌2SO₃(g)

Adding SO₃(g) will

• shift equilibrium right

• shift equilibrium left

• increase rate of reaction

• have no change

Which of the following is NOT true at equilibrium?

• The concentrations of reactants and products do not change.

• The forward and reverse reactions proceed at the same rate.

• The concentration of the reactants is equal to the concentration of the products.

• The forward and reverse reactions continue to occur.

The following factors affect the position of equilibrium EXCEPT

• Concentration

• State of Matter

• Temperature

• Pressure

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

At elevated temperatures ammonium carbonate, NH₂COONH₄, is in equilibrium with NH₃ and CO₂ according to the equation;

NH₂COONH₄ ↔ 2 NH₃ + CO₂

What is the equilibrium expression for this reaction?

• K = 2 [NH₃][CO₂]

  [NH₂COONH₄]

• K = [NH₃]²[CO₂]

  [NH₂COONH₄]

• K = 2 [NH₃][CO₂]

• K = [NH₃]²[CO₂]

What is the equilibrium-constant expression for

CO₂(g) + H₂(g) ↔ CO(g) + H₂O (g)

• K_c= [CO][H₂O] / [CO₂][H₂]

• K_c= [CO₂][H₂] / [CO]

• K_c= [CO₂][H₂] / [CO][H₂O]

• K_c= [CO] / [CO₂][H₂]