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Dimensions of chemical reaction rates

Page history last edited by Mark Eichenlaub 3 years, 4 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


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