IMPORTANT FACTS ABOUT EQUILIBRIUM (eq’m) Equilibrium can be “approached” from either direction. How an equilibrium is formed: If N2O4(g) is placed in a sealed container, it will rapidly form NO2(g) As NO2(g) is formed, the reverse reaction starts to speed up, reforming N2O4(g) Eventually, the rate of the forward reaction = the rate of the reverse reaction. EQUILIBRIUM (Nelson Chemistry 12, Section 7.1, Pg.424) Some reactions occur in only one direction Frying an egg 2 Pb(NO3)2 - 2 PbO + 4 NO2 + O2 Burning a piece of paper C6H12O6(s) + 6 O2(g) - 6 CO2(g) + 6 H2O(l) Other reactions can occur in both directions (reversible) CuSO4*5H2O(s) ↔ CuSO4(s) + 5 H2O(l) H2(g) + I2(g) ↔ 2 HI(g) N2O4(g) ↔ 2 NO2(g) EQUILIBRIUM: when the forward and reverse reactions are occurring at the same rate.
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