k values

[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?

[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.

[Philipp_V_Dis1K]

K depends on the order of the reaction, because the concentrations of the reactants are raised to different powers.

[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?

[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.