Rate constant vs. rate

$aR \to bP, Rate = -\frac{1}{a} \frac{d[R]}{dt} = \frac{1}{b}\frac{d[P]}{dt}$

Shanzey
Posts: 120
Joined: Wed Sep 18, 2019 12:20 am

Rate constant vs. rate

What is the difference between rate constant and rate? Does the rate constant of a reaction never change, while the rate is subject to change due to changes in molar concentrations?

Niharika 1H
Posts: 50
Joined: Thu Jul 25, 2019 12:16 am

Re: Rate constant vs. rate

The rate constant of a reaction is constant. The rate of the reaction depends on the rate constant and initial concentrations of species.

Tracy Tolentino_2E
Posts: 140
Joined: Sat Sep 07, 2019 12:17 am

Re: Rate constant vs. rate

Rate constant is the comparative rates of reaction and product while rate is the measurement of how fast or slow a reaction occurs. A rate constant only changes with temperature but rate is affected by change in k or concentration.

805394719
Posts: 104
Joined: Wed Sep 11, 2019 12:16 am

Re: Rate constant vs. rate

The rate constant shows the relation between the concentration of a reactant and the rate of a reaction. The rate of a reaction depends on the concentration of the reactant with a proportionality constant of the rate constant. Because the proportionality between the rate of the reaction and the concentration does not change, the rate constant remains unchanged. The rate, however, depends on the concentration of the reactant and will change over time as the concentration of the reactants and products change if the reverse reaction occurs and the products stay in the reaction, unlike gases that can leave the reaction.

Shimei_2F
Posts: 100
Joined: Fri Aug 09, 2019 12:17 am

Re: Rate constant vs. rate

You can use rate constant to calculate the rate. Rate constant doesn't change while rate does.