Equilibrium Review

An equilibrium constant with a large magnitude indicates…

• A very fast reaction

• Higher concentration of products at equilibrium

• Higher concentration of reactants at equilibrium

• Nothing, without considering the stoichiometry of the reaction

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...

SO₂ + O₂ ↔ SO₃

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

• increase

• decrease

• remain the same

• double

Tags

NGSS.HS-PS1-7

For the reaction...
SO₂ + O₂ ↔ SO₃
If the equilibrium shifts to the right, the concentration of SO₃ will ___________.

• increase
• decrease
• remain the same
• double

Tags

NGSS.HS-PS1-6

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

The solubility of Cd(OH)₂ in water is 1.67 x 10^-5 mol/L. The K_sp value for Cd(OH)₂ is

• 1.86 x 10^-14
• 4.66 x 10^-15
• 5.58 x 10^-10
• 1.67 x 10^-5

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

H₂(g) + I₂(g) ⇄ 2 HI(g)

At 450^oC, 2.0 moles each of H₂(g), I₂(g), and HI(g) are combined in a 1.0 L rigid container. The value of K_c at

450^oC is 50. Which of the following will occur as the system moves toward equilibrium?

• More H₂(g) and I₂(g) will form.

• More HI(g) will form.

• The total pressure will decrease.

• No net reaction will occur, because the number of molecules is the same on both sides of the equation.

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

C₂H₄(g) + 3 O₂(g) ↔ 2CO₂(g) + 2H₂O(g)

An equal number of moles of each of the reactants are sealed in a container and allowed to come to the equilibrium shown above. At equilibrium which of the following must be true?

I. [CO₂] must be equal [H₂O]

II. [O₂] must be less than [C₂H₄]

III. [CO₂] must be greater than [C₂H₄]

• I only

• II only

• III only

• I and II

• II and III

Tags

NGSS.HS-PS1-6