Equilibrium Law & Equilibrium Constant

For IB:

What is the Equilibrium Constant Expression? How is it represented?

the mathematical description of a chemical system at equilibrium using a balanced chemical equation at constant temperature

if we represented an equation as:
aA + bB ⇌ cC + dD

What does K_c represent? What is its unit?

equilibrium constant

no units

What would the Equilibrium Constant Expression of the following equation be?:

cC + dD ⇌ aA + bB

What is the effect on the K value if coefficients are halved?

What is the effect on the K value if coefficients are doubled?

What is the effect on the K value if the equation is reversed?

What is the effect on the K value if two equations are added together?

What do these tables tell us about Equilibrium Constants?

• Kc ONLY changes with TEMPERATURE

• If all other variables remain constant, Kc will remain unchanged for that reaction (equilibrium law)!