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k values

Posted: Tue Mar 05, 2019 10:07 pm
by Samantha Chung 4I
I do not quite grasp the concept of "k" how do we determine the units of k, does k even have units?

Re: k values

Posted: Tue Mar 05, 2019 10:59 pm
by Searra Harding 4I
k is a rate constant and commonly seen as a proportionality constant. You can determine units by plugging in your rates to the rate expression and raising them to the respective exponent (rates are in M/s which is the same as mol/(L*s)). So if k= rate/([A]^2[B]) then k will have the units M^-2 s^-1.

Re: k values

Posted: Wed Mar 06, 2019 9:33 am
by Philipp_V_Dis1K
K depends on the order of the reaction, because the concentrations of the reactants are raised to different powers.

Re: k values

Posted: Fri Mar 08, 2019 9:41 am
by Danny Elias Dis 1E
Is k only found experimentally (like order), or do we have to calculate k given reactant concentrations and a rate law?

Re: k values

Posted: Fri Mar 08, 2019 8:18 pm
by Eric Quach 1C
k is the rate constant and is different for each reaction. the units for k vary depending on the order of the reaction. k can be found experimentally, but on the tests we will probably have to calculate it or solve for it.