Rate Constant k

[Helen Shi 1J]

Can someone explain what exactly is the rate constant?

[jillian1k]

The rate constant k is just an experimentally determined value for a specific reaction at a specific temperature (therefore different reactions have different rate constants). It is also independent of concentration or concentration change. Unless temperature (and/or activation energy) changes, k will remain the same. Therefore, it limits the reaction rate: the higher the k value, the faster the reaction proceeds (therefore making the reaction rate higher).

[Grace Han 2K]

Also, rate constants are dependent on temperature and activation energy.

[Matthew Lee 3L]

The rate constant's units are also dependent on the order of the reaction.

[Seth_Evasco1L]

- As temperature (T) increases, k increases
- As activation energy (E_a) increases, k decreases
- As frequency factor (A) increases, k increases

[Mitch Walters]

The rate constant is an experimentally determined value for a specific reaction at a specific temperature. It essentially tells you the instantaneous rate of change.

[Sarah 2F]

instantaneous rate of change