Equilibrium Practice

Select the statement that best describes chemical equilibrium

Reactants ↔ Products

• [Reactants] = 0

• [Products] = 0

• [Reactants] = [Products]

• [Reactants]⋅K = [Products]

SO₂Cl₂(g) ⇌ SO₂(g) + Cl₂(g)

Write the equilibrium constant expression in terms of concentrations

e

a

[SO₂][Cl₂]

[SO₂]+[Cl₂]

[Cl₂]

[SO₂]

[SO₂Cl₂]

CaCO₃(s)     ⇌    CaO(s) + CO₂(g)

Write the equilibrium constant expression in terms of concentrations

c

f

[CaO]+[CO₂]

[CO₂]

1

[CaCO₃]

[CaO]

[CaO][CO₂]

Co(s) + 2 H⁺(aq) ⇌ Co²⁺(aq) + H₂(g)

Write the equilibrium constant expression in terms of concentrations

f

c

[Co]

[H₂]

[H⁺]

[Co²⁺]

[H⁺]²

[Co²⁺][H₂]

[Co][H⁺]²

[Co][H⁺]

For the reaction below, calculate the equilibrium constant K_c if [HA]_eq = 1.65 x 10^–2 M and [H⁺]_eq = [A^–]_eq = 5.44 x 10^–4 M.

HA (aq) ⇌ H⁺ (aq) + A^– (aq)

Mathematical Equivalence

ON

If the value of the equilibrium constant is 1000, then at equilibrium, mostly _______ will be present

• catalysts

• reactants

• products

• intermediates

Suppose the endothermic reaction below has reached equilibrium:

SO₂Cl₂(g) ⇌ SO₂(g) + Cl₂(g).

What type of disturbance will ultimately cause a decrease in [SO₂Cl₂]?

• Increase temperature

• Decrease temperature

• Increase pressure

• Increase Cl₂

Suppose K_P = 2.39 at a given temperature for the reaction

SO₂Cl₂ ⇌ SO₂ + Cl₂. 

What is K_P for the reverse reaction at the same temperature as written below?

SO₂ + Cl₂ ⇌ SO₂Cl₂

Mathematical Equivalence

ON

Consider the reaction

SO₂Cl₂ ⇌ SO₂ + Cl₂. 

Suppose K_P = 2.39 at a given temperature.

Initially the partial pressure of SO₂Cl₂ is 1.00 bar, and no products are added. 

Set up the ICE chart (I row) ​to solve for equilibrium concentrations.

I:​ (a)   |​ (b)   |​ (c)  

• 1.00
• 0
• x
• 2.39

Consider the reaction

SO₂Cl₂ ⇌ SO₂ + Cl₂. 

Suppose K_P = 2.39 at a given temperature.

Initially the partial pressure of SO₂Cl₂ is 1.00 bar, and no products are added. 

Set up the ICE chart (C row) ​to solve for equilibrium concentrations.

C: (a)   | (b)   | (c)  

• 1.00
• 2.39
• +x
• -x
• 0