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### Rate Constant k

Posted: Thu Mar 08, 2018 11:07 am
Can someone explain what exactly is the rate constant?

### Re: Rate Constant k

Posted: Thu Mar 08, 2018 11:18 am
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).

### Re: Rate Constant k

Posted: Thu Mar 08, 2018 4:43 pm
Also, rate constants are dependent on temperature and activation energy.

### Re: Rate Constant k

Posted: Fri Mar 09, 2018 1:40 am
The rate constant's units are also dependent on the order of the reaction.

### Re: Rate Constant k

Posted: Fri Mar 09, 2018 3:00 pm
- As temperature (T) increases, k increases
- As activation energy (Ea) increases, k decreases
- As frequency factor (A) increases, k increases

### Re: Rate Constant k

Posted: Fri Mar 09, 2018 4:30 pm
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.

### Re: Rate Constant k

Posted: Fri Mar 09, 2018 7:02 pm
instantaneous rate of change