Equilibrium and K Check

Match the following

• K value < 1

• Equal amount of reactant and products at equilibrium

• K value = 1

• More products than reactants at equilibrium

• K value > 1

• More reactants than products at equilibrium

A K value for a reaction will change if the initial amounts of reactants change.

• True

• False

Equilibrium for a reaction occurs when ______

• the concentrations of reactants and products are equal

• the rates of forward and reverse reactions are equal

• the concentrations of the reactants and products stay constant

Around what time does the reaction reach equilibrium?

• 25 min

• 70 min

• 45 min

• 80 min

Which of the two graphs reaches equilibrium?

• Neither

• The left

• Both

• The right

SO₂Cl₂(g) ⇌ SO₂(g) + Cl₂(g)

Write the equilibrium constant expression in terms of concentrations

e

a

[Cl₂]

[SO₂][Cl₂]

[SO₂]+[Cl₂]

[SO₂]

[SO₂Cl₂]

Co(s) + 2 H⁺(aq) ⇌ Co²⁺(aq) + H₂(g)

Write the equilibrium constant expression in terms of concentrations

f

c

[Co][H⁺]

[Co²⁺]

[H⁺]

[H₂]

[Co][H⁺]²

[Co]

[H⁺]²

[Co²⁺][H₂]

Calculate Kc for the reaction 2HI_(g) —> H_2(g) + I_2(g) given that the concentrations of each species at equilibrium are as follows: [HI] = 0.85 mol/L, [I₂] = 0.60 mol/L, [H₂] = 0.27mol/L.

• 0.19

• 0.22

• 4.5

• 5.25

• 160

To calculate the K of an overall reaction from individual reaction K values, the individual K values are

• added

• subtracted

• multiplied

• divided

The reaction SO₂ + O₂ ⇌ SO₃ has a K value of 100.

What would be the K value of 2SO₂ +2 O₂ ⇌ 2 SO₃ ?

• 10000

• 200

• 50

• 0.01