Can the rate constant (K) ever be a negative value?

Question

Can the rate constant (K) ever be a negative value?

Answer 1

reversible reactions that are exothermic.?????

ideally it can.

Answer 2

It can NEVER be negative, its  a proportionality constant of the rate a reaciton It can increase or decrese with temperature but NEVER be negative

Answer 3

k is the rate constant that change with temp.

Answer 4

Think about what it would mean if K were negative.

That would mean that the molar concentration for at least one of the reactants or products was negative.  That means that there would be LESS THAN ZERO moles.

That is an absurd concept.  

So, no K can never be negative.