Physical Equilibrium

Question 1

What is the Equilibrium Constant?

Answer 1

Relationship between concentrations of reactants and products of chemical reaction.

wA + xB <—> yC + xD

Keq = [C]^y [D]^z / [A]^w [B]^x

Question 2

Keq & Temperature

Answer 2

Increase Temperature: Equilibrium shifts away from heat.

Decrease Temperature: Equilibrium shifts towards heat.

Question 3

Le Châtelier Principle

Answer 3

If a stress (change of conditions) is applied to a system at equilibrium, the system will readjust (change position of equilibrium) to reduce stress of system.

Question 4

Change in Concentration

Answer 4

Concentration Added —> Equilibrium shifts to side that Consumes added amount.
Concentration Removed —> Equilibrium shifts to side that Produces More of removed substance.

Question 5

Temperature Change

Answer 5

Heat is added to Exothermic; Equilibrium Shift Left to decrease amount of heat.

Heat is reduced in Exothermic; Equilibrium Shift Right to replace lost heat.

Heat is added in Endothermic; Equilibrium shift right to decrease amount of heat.

Heat is reduced in Endothermic; Equilibrium shift left to replace lost heat.

Question 6

Pressure Change (& Volume)

Answer 6

Increased Pressure —> Decreasing # of moles

Decreased Pressure —> Increasing # of moles

Increase Volume (= Decreased Pressure) —> Increasing # of moles

Decrease Volume (= Increased Pressure) —> Decreasing # of moles