Chemical Equilibrium A Balancing Act

Equilibrium two opposing processes occurring at the same rate a system at equilibrium is in balance

During a game, players enter and leave. Always the same number of players on field.

H2O(l) H2O(g)

Saturated solution of NaCl Total amount of dissolved NaCl remains constant Total amount of undissolved NaCl remains constant Rate of Solvation = Rate of cystallization

Photochromic sunglasses AgCl + light Ag + Cl (transparent) (dark)

Reversible reaction a chemical reaction that can occur in both the forward and the reverse directions N2(g) + 3H2(g) 2NH3(g)

N2(g) + 3H2(g) 2NH3(g) Start of Rxn Reverse Rxn has begun Rxn at equilibrium

Chemical equilibrium a state in which the forward and reverse reactions balance each other because they take place at equal rates dynamic state; no net change

Equilibrium favors the reactant side N2O4 (g) 2NO2 (g) equilibrium equilibrium equilibrium Start with NO2 Start with N2O4 Start with NO2 & N2O4 Equilibrium favors the reactant side

Quick Quiz. 1) When a reaction has reached equilibrium, reactants and products have stopped reacting. continue forming, but at equal rates C) have equal concentrations. D) decrease in concentration.

Quick Quiz. 2) What is a reaction called in which products can react to re-form reactants? Reformation B) Reversible C) Buffered D) Impossible