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Jasmine Botello 2F wrote:how would you identify them?
When one of your reactants are in excess compared to the other reactants. For instance, if you have 10 M of A and react with 0.001 M of B according to the following reaction A + B --> C, you can imagine that the concentration of A will vary very little and can thus be considered to be at constant concentration. As a result, even if the reaction may be a second order reaction (Rate = k[A][B]), with [A] being constant, the rate will seem like it is a first order reaction (Rate = k[A]o[B], with [A]o being the initial concentration of A, which is constant). This is known as a pseudo first order reaction.
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