What is meant by rate constant (k) of a reaction?

What is meant by the 'rate constant, k' of a reaction ? If the concentration be expressed in mol L^(-1) units and time in seconds, what would be the units for k (i) for a zero order reaction and (ii) for a first order reaction?

What is meant by the 'rate constant, k' of a reaction. If the concentration be expressed in mol L^1 units and time in seconds, what would be the units for k for a zero order reaction and for a first order reaction.

What is meant by the 'rate constant, k' of a reaction ? If the concentration be expressed in mol L^(-1) units and time in seconds, what would be the units for k (i) for a zero order reaction and (ii) for a first order reaction?

What is meant by the rate constant, ‘k' of a reaction. If the concentration be expressed in mol L^-1 units and time in seconds, what would be the units for k for a zero order reaction ?

What is meant by the rate constant, ‘k' of a reaction. If the concentration be expressed in mol L^-1 units and time in seconds, what would be the units for k for a first order reaction ?

What is meant by zero order reaction ? What is the rate constant of such a reaction ?

What is meant by zero order reaction ? What is the rate constant of such a reaction ?

What is meant by zero order reaction ? What is the rate constant of such a reaction ?