equilibrium

What is the effect of concentration change?

Increased conc of products - moved to left

Increased conc of reactants - moved to right

What is the effect of temperature change?

Increased tem - equilibrium shifts to endothermic side

Decreased temp - equilibrium shifts to exothermic side

What is the effect of pressure change?

Increased pressure - shifts to fewer molecules side

Decreased pressure - shifts to more molecules side

How to express Kc?

(Products)/(reactants)

Difference between homogenous and heterogenous equilibria?

Homo - equilibrium species with same state/phase

Hetero - species with different state/phase

How to work out equilibrium amount?

ICE method

Inital moles

Change in mol

Equilibrium moles

How to calculate Kp (gases)

Express Kp using mole fraction

mole fractions = Moles of A/total moles in mixture

Calculate partial pressure

PP = mole fraction (A) * total pressure

What has an effect on value of Kc?

Only temperature

How does value of Kc affect equilibrium of reaction?

• large Kc = more products/equilibrium to right

• small Kc = favours reactants/equilibrium to left