CHM1011 Lecture Notes - Lecture 9: Magic 2Ch, Dynamic Equilibrium, Reaction Quotient
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Thermodynamic equilibria: do all chemical reactions go to completion, compare these two reactions: (i) mg(s) + 2 hcl(aq) mgcl2(aq) + h2(g) This reaction goes to completion, which is indicated by the single headed arrow only going in one direction (ii) ch3cooh(aq) + ch3ch2oh(aq) ch3cooch2ch3(aq) + h2o(l) The double headed arrow indicates the reaction occurs in both directions, i. e. it is an equilibrium. Starting with just n2 and h2 in the reaction vessel, the following occurs during the reaction: Meaning of kckc indicates the extent of a reaction (i. e. how far the forward reaction proceeded before equilibrium was established) If kc is small (< 10-3), then the reactants are favoured. If kc is large (> 103), then the products are favoured. If 10-3