Equilibrium Review 2020

N₂O₄(g) ↔ 2 NO₂(g)

What is the equilibrium constant expression?

• K = [NO₂]²/[N₂O₄]

• K = [N₂O₄]/[NO₂]²

• K = [N₂O₄]²/[NO₂]

• K = [NO₂]/[N₂O₄]²

What is the equilibrium expression for:

Fe₃O₄(s) + 4 H₂(g) ↔ 3 Fe(s) + 4 H₂O(g)

• K = ([Fe]³[H₂O]⁴ ) / ([Fe₃O₄][H₂]⁴)

• K = ([Fe₃O₄][H₂]⁴)/ ([Fe]³[H₂O]⁴)

• K = [H₂O]⁴ / [H₂]⁴

• K = ([Fe][H₂O]) / ([Fe₃O₄][H₂])

Tags

NGSS.HS-PS1-6

If the equilibrium constant is much less than one (K << 1) then

• Equilibrium is not established.
• Equilibrium lies to the right (products are favored)
• Equilibrium lies to the left (reactants are favored)
• Neither products or reactants are favored.

For the reaction...
heat  +  N₂  +  O₂  ↔  2NO
If the heat is added to the chemical system, the equilibrium will shift _______.

• left
• right
• left and right
• neither left nor right

Tags

NGSS.HS-PS1-5

For the reaction...
N_{2 (g)} +  3 H_2 (g) ↔ 2 NH_{3 (g)}

If the pressure in the system is increased,  _______ reaction will be favored.

•  the forward
• the reverse
• neither

What is equilibrium?

• Reaction stops once products are formed.
• Reactants and products are being formed constantly.
• Reaction uses up all of the reactants.

T/F: At equilibrium, the amount of reactants and products are the same.

• True
• False

T/F: At equilibrium, the rate of transfer between the reactants and products is unequal.

• True
• False

T/F: A reaction must start with the same amount of reactants as products to reach equilibrium.

• True
• False

T/F: At equilibrium, the rate of transfer between the reactants and products is equal.

• True
• False