different units

[Katie Bart 1I]

Why are the units different in first, second, etc. ordered reactions?

[Aiden Metzner 2C]

Each different ordered reactions involve having the concentrations be increased to certain powers. ^2 for second order. Therefore the units are changed by that order as well.

[EvanWang]

It is because you want the right units in the end when you multiply everything to find the rate using the differential or integrative rate law. In a reaction with an overall order of 4 for example, you will have the unit of mol/L multiplied by itself 4 times, so the units of k must be different so that the rate is in moles per liter per second.

[Maya Pakulski 1D]

The units of k specifically in different order reactions are
zero-order M/s
first-order 1/s
second-order 1/M*s

[Mitchell Koss 4G]

k=rate/[A]

rate=M/s
[A]=M