Order Of Reaction

For nth order reaction,

the units of rate constant =

(where, n = order of reaction)

For first order reaction,

the units of rate constant=

For a first-order reaction, the integrated rate law is: This is in the form of a straight line equation: where slope , and the negative sign indicates that the concentration decreases over time. Therefore, the slope of the graph of vs time is:

For a zero-order reaction, the rate law is: Integrating, we get: This equation is of the form , which represents a straight line with a negative slope when is plotted against . Hence, the plot of vs gives a straight line.