Investigating Chemical Equilibria

In some chemical systems the energies of the reactants and the products are of a similar order of magnitude so that the reaction is reversible, that is, it can take place in either direction. If such a system is established in a closed vessel, so that no gases could escape, then a chemical equilibrium is established. The forward and the reversible reaction have the same rate.

So, if for example we take the reversible reaction A+B„© C+D, then the initially forward reaction occurs rapidly, but as the concentration of the reactants falls, the rate decreases. The reverse reaction initially cannot occur at all, but as the products start to form, its rate increases. Consequently, the rate of the two reactions becomes equal, the concentrations reach constant values and the equilibrium is established.

There are conditions, such as the temperature, the pressure and the concentration. According to Le Chatelier¡¦s principle, ¡§if a change is made to the conditions of a chemical equilibrium, then the position of a chemical equilibrium will readjust so as to minimise the change made¡¨.

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Approximate Word count = 1564
Approximate Pages = 6 (250 words per page double spaced)