Chem 105 Chemical Equilibrium

state of a system where concentrations of components no longer changes with time - indicated by ↔

• Chemical equilibrium

• when 2 rates become equal

• Le Chatelier’s Principle

no net concentration change (equilibrium!)

• Chemical equilibrium

• when 2 rates become equal

• Le Chatelier’s Principle

tells which way reaction will go - When a system at equilibrium is disturbed, it'll react to counteract disturbance to restore equilibrium

• Chemical equilibrium

• when 2 rates become equal

• Le Chatelier’s Principle

forward and reverse reactions are (a)   happening at the molecular level

Every chemical reaction will have a preferred (a)   ratio K (the equilibrium constant

When equilibrium is reached, ratio of product to reactant (a)   raised to their stoichiometric coefficients is a consistent value unique to that reaction

For Equilibrium Constant K_c if K > 1

• reaction is product-favored at equilibrium

• reaction is reactant-favored at equilibrium

• products >> reactants

• products << reactants

For Equilibrium Constant K_c if K < 1

• reaction is product-favored at equilibrium

• reaction is reactant-favored at equilibrium

• products >> reactants

• products << reactants

For Equilibrium Constant K_c if K is huge (e.g. 10²⁰ or 10³⁰)

forward reaction

• reaction is product-favored at equilibrium

• reaction is reactant-favored at equilibrium

• products >> reactants

• products << reactants

For Equilibrium Constant K_c if K is tiny (e.g. 10^-20 or 10^-30)

reverse reaction

• reaction is product-favored at equilibrium

• reaction is reactant-favored at equilibrium

• products >> reactants

• products << reactants