CH1001 Lecture Notes - Lecture 9: Equilibrium Constant, Exothermic Process, Partial Pressure

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16 Jul 2018
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In principle, any and every action is reversible. In practice many reactions favour the products so strongly that the reaction can be treated as proceeding in one direction (irreversible). A fundamental aspect of chemistry is also the extent they go. A reaction may proceed very rapidly, but to only a limited extent. This is because the reverse reaction is also occurring. Thus after a certain length of time, the rate of the forward reaction and reverse reaction counterbalance one another, with the net result that the ratio of reactants to products remains constant. Concentration of remaining reactant becomes too small to measure. After reaction, no measurable reactants remain - not considered to have an equilibrium. Experimentally, we find that reverse reaction also occurs (formation of reactants). At given temperature, doesn"t matter which ones are reactants, always have a mixture. At some point the ratio of reactants : products becomes constant - chemical equilibrium.

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