## relationship of K and time

BeylemZ-1B
Posts: 95
Joined: Thu Jul 25, 2019 12:17 am

### relationship of K and time

Will the instantaneous rate always decrease as the reaction proceeds? is there ever a chance we will see a reaction where the rate of reaction increases as time increases?

vpena_1I
Posts: 109
Joined: Sat Aug 24, 2019 12:15 am

### Re: relationship of K and time

I believe it will always decrease because reactions tend to move towards equilibrium, not against it.

Connor Chappell 2B
Posts: 59
Joined: Wed Feb 20, 2019 12:16 am

### Re: relationship of K and time

yes, the instantaneous rate is always its maximum value in the initial stages when you have your initial concentrations of each reactant and are ready to conduct the experiment. As the reaction approaches equilibrium, the instantaneous rate of the reaction decreases, and the rates of the forward and reverse reactions reach a point where they are equal, and then the reaction is considered to be at equilibrium.

Eesha Sohail 1D
Posts: 100
Joined: Sat Aug 17, 2019 12:16 am

### Re: relationship of K and time

Just to make sure I've got this down: for a zero-order reaction the rate doesn't change, for a first-order reaction the rate decreases linearly, and for a second-order reaction it decreases exponentially. Is that correct?