Rate Constant k


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Helen Shi 1J
Posts: 78
Joined: Sat Jul 22, 2017 3:00 am

Rate Constant k

Postby Helen Shi 1J » Thu Mar 08, 2018 11:07 am

Can someone explain what exactly is the rate constant?

jillian1k
Posts: 54
Joined: Sat Jul 22, 2017 3:00 am

Re: Rate Constant k

Postby jillian1k » 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).

Grace Han 2K
Posts: 33
Joined: Tue Nov 15, 2016 3:00 am

Re: Rate Constant k

Postby Grace Han 2K » Thu Mar 08, 2018 4:43 pm

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

Matthew Lee 3L
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Joined: Fri Sep 29, 2017 7:07 am

Re: Rate Constant k

Postby Matthew Lee 3L » Fri Mar 09, 2018 1:40 am

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

Seth_Evasco1L
Posts: 54
Joined: Thu Jul 27, 2017 3:00 am

Re: Rate Constant k

Postby Seth_Evasco1L » 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

Mitch Walters
Posts: 45
Joined: Fri Sep 29, 2017 7:07 am

Re: Rate Constant k

Postby Mitch Walters » 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.

Sarah 2F
Posts: 33
Joined: Fri Sep 29, 2017 7:06 am

Re: Rate Constant k

Postby Sarah 2F » Fri Mar 09, 2018 7:02 pm

instantaneous rate of change


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