In chemical kinetics, a reaction rate constant or reaction rate coefficient, k, quantifies the rate of a chemical reaction. Rate constant depends on the temperature, while the rate depends on several other factors. The rate constant is a proportionality constant, which is part of the reaction rate. Both the reaction rate and rate constant are associated with indicating the reaction speed.
The critical difference between reaction rate and rate constant is that the reaction rate and rate constant is the speed at which reactant is converted into products. In contrast, the rate constant is a coefficient of proportionality relating the rate of a chemical reaction at a specific temperature.
Some responses are slow, so we cannot even see the result taking place lest we observe it for an extremely long time. For example, rock eroding by chemical processes is a slow reaction, that takes place over many years.
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