reaction rate and rate constant

[Cecilia Tsai 3C]

Hi guys,
what's the difference between reaction rate and rate constant, if any?

[hpage204]

The reaction rate is the rate at which a product is produced or a reactant is consumed. The rate constant is the calculated value, K, that is used to calculate the reaction rate. K varies for each reaction and must be calculated to determine a reaction's rate law. Also, the units for K vary depending on what order the reaction is.