Units

[smurphy1D]

Are units for all rate constants M/s? And what does it mean if the s has a -1 attached in the denominator?

[asannajust_1J]

the units for k are 1/M^(n-1)*s. n being the order of the reaction. Thus, if the reaction is first order the units are 1/s and second order 1/Ms and so on.
x-1 is just 1/x

[Michael Nguyen 1E]

The unit for the rate constant will depend on the overall reaction order. The rate will always be in units of M/s and each concentration will be in M. So the rate constant will always be in units so that when multiplied with the concentrations, the result will be in M/s.

[Leonardo Le Merle 1D]

Zeroth order: M * s^-1
First order: s^-1
Second Order: M^-1 * s^-1
etc.

[Tanmay Singhal 1H]

rate constant units are determined by order of reaction