Equilibrium

Question 1

What is the only factor that will affect Kc and any equilibrium constant?

Answer 1

Temperature

Question 2

How do you calculate units for Kc

Answer 2

For a reaction aA + bB ⇌ cC + dD 
Kc = [C]^c [D]^d
       -----------------
        [A]^a [B]^b
Its moles of products over moles of reactants with the balancing numbers as powers, but if asked for concentration divide the equilibrium moles by the volume given.

Question 3

What is Le Chatelier’s principle?

Answer 3

If a system in equilibrium is subjected to a change, process will occur that tend to counteract the change imposed.

Question 4

Increasing temperature for an

• Exothermic
• Endothermic

Decreasing temperature for an

• Exothermic
• Endothermic

Answer 4

Increase
Exothermic - Position of equilibrium to the left, Kc decreases
Endothermic - Position of equilibrium to the right, Kc increases

Decrease
Exothermic - Position of equilibrium to the right
Endothermic - Position of equilibrium to the left

Question 5

Increasing concentration of

• Reactant
• Product

Answer 5

Increase
Reactant - Position of equilibrium to the right
Product - Position of equilibrium to the left

Decrease
Reactant - Position of equilibrium to the left
Product - Position of equilibrium to the right

Question 6

Product side has more moles

• Increase in pressure
• Decrease in pressure

Answer 6

Product side has more moles
Increase - Equilibrium to the left
Decrease - Equilibrium to the right

Question 7

What happens when you add a catalyst?

Answer 7

Means you reach equilibrium more quickly