2.3 Extent of chemical change

• Forward rate = backward rate (closed system)

• Describe physical and chemical systems at equilibrium

• K determined from stoichiometry

• Deduce K expressions for homogeneous reactions

• Magnitude indicates extent of reaction

• Temperature dependent

• Kreverse = 1/Kforward

• Interpret K << 1, K < 1, K = 1, K > 1, and K >> 1

• Predict effects of changes in concentration, temperature, pressure

• Include effects on K and equilibrium composition