# Reaction rate

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A reaction rate is the rate of change of a component in a chemical reaction.[1] The most useful way to express a reaction rate is typically with respect to the disappearance of the limiting reactant:

$-r_A=\frac{dC_a}{dt}$

where

-rA is the reaction rate of species A
CA is the concentration of species A
t is time

## References

1. Wile, Jay L. Exploring Creation With Chemistry. Apologia Educational Ministries, Inc. 1998