• If you are citizen of an European Union member nation, you may not use this service unless you are at least 16 years old.

  • Get control of your email attachments. Connect all your Gmail accounts and in less than 2 minutes, Dokkio will automatically organize your file attachments. You can also connect Dokkio to Drive, Dropbox, and Slack. Sign up for free.


Dimensions of chemical reaction rates

Page history last edited by Mark Eichenlaub 2 years, 10 months ago Saved with comment



The concentration of a chemical, A, is often written a "[A]". Since we are using square brackets to tell us to do a dimensional analysis, we will instead use the notation "cA" to represent the concentration of a chemical A. We express dimensionality to show how different measurements must be combined to create the quantity involved:  in powers of M (measured by a scale), L (measured by a ruler), and T (measured by a clock).The dimensionality of a concentration is number/unit volume, [c] = 1/L3


1. If the chemical reaction



has rate constants kfor the forward reaction and kr for the reverse reaction, then (in the absence of a catalyst) the rate of change of the concentration of the chemical AB is given by



If this is so, are the dimensionalities of kf and kr the same?

      • Yes
      • No
      • Cannot tell from the information given. 


Explain the reasoning you used to make your decision. 


2. What is the dimensionality of the rate constant kf ?



Joe Redish 10/21/16


Comments (0)

You don't have permission to comment on this page.