Chemistry Practice Problems Identifying Reaction Order Practice Problems Solution: Comparison of first-order and zero-order reactions...

Solution: Comparison of first-order and zero-order reactions for the disappearance of reactant A with time.At which times during the reaction would you have trouble distinguishing a zero-order reaction from a first-order reaction?

Problem


A graph has time on the x-axis and concentration of A on the y-axis. Both axes are unscaled. Two curves are plotted, one for a zero-order reaction and one for a first order reaction. Both begin high on the y-axis at the initial time at a concentration of A0. From there, the zero order reaction declines steeply and linearly with slope equal to negative k times t until it contacts the x-axis. The first order reaction declines with a concave shape and does not contact the x-axis.


Comparison of first-order and zero-order reactions for the disappearance of reactant A with time.


At which times during the reaction would you have trouble distinguishing a zero-order reaction from a first-order reaction?

Solution

We have to describe at what times we can have trouble distinguishing a zero-order reaction from a first-order reaction.


The order of a chemical reaction is defined as the sum of power of concentrations of the reactants in the rate equation.


Order of a chemical reaction is determined experimentally; it cannot be determined using stoichiometry from balanced chemical equation.


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