Trial UPS Chapter 6: Chemical Equilibrium

What are the two factors to look for when determining if the reaction is at equilibrium?

• Forward reaction rate is faster than the reverse and concentrations are equal
• Forward and reverse reaction rates are equal and concentration is constant
• Forward and revers reaction rates are equal and concentration is equal
• Forward reaction rate is faster than the reverse and concentration is equal

Tags

NGSS.HS-PS1-6

NGSS.HS-PS1-5

For the reaction...

SO_{2 (g)} + O_{2 (g)} ⇌ SO_3(g)

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

• left

• right

• left and right

• neither left nor right

For the reaction...

N_{2 (g)} + 3 H_2(g) ⇌ 2 NH_{3 (g)}

If the pressure in the system is increased, which substance(s) will increase in concentration?

• N₂

• H₂

• N₂ and H₂

• NH₃

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

• shift equilibrium right
• shift equilibrium left
• increase pressure
• have no change

Which of the following is NOT true at equilibrium?

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

• The concentrations of reactants and products do not change.

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

• The forward and reverse reactions continue to occur.

H₂(g)+Cl₂(g)⇌2HCl(g)

The forward reaction is exothermic. What will happen to the equilibrium if the temperature is increased?

• equilibrium shifts right

• equilibrium shifts left

• You cannot predict the effect

• no change

Tags

NGSS.HS-PS1-6

NGSS.HS-PS1-5

At what time the reaction reached equilibrium?

• t₁
• t₂
• t₃
• t₄

Tags

NGSS.HS-PS1-6

What kind of equilibrium does the reaction below show?

H_2(g) +I_2(g) ↔ 2HI_(g)

• Heterogeneous equilibrium, all the reactants and products are in the same physical state.

• Homogeneous equilibrium, all the reactants and products are in the same physical state.

• Heterogeneous equilibrium, the reactants and products are present in more than one physical state

• Homogeneous equilibrium, the reactants and products are present in more than one physical state

Which of the two graphs reaches equilibrium?

• The left one.
• The right one.
• Both of them.
• Neither.

Tags

NGSS.HS-PS1-6

Le Chatelier's Principle states that:

• a disturbing force must be applied to a system in order for it to reach equilibrium.

• when a system at equilibrium is disturbed, a new equilibrium constant is established.

• when a chemical system at equilibrium is disturbed, the system shifts in order to minimize the effect.

• when a chemical system is at equilibrium it is no longer possible to alter the system.