what changes rate constant?

gooperwooper

so I think only temp can change the equilibrium constant but what about the rate constant?

orgoman22

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so I think only temp can change the equilibrium constant but what about the rate constant?
The rate constant, k, can be changed by several parameters such as catalysts, pressure, solvents, light intensity, and temperature. An important point to remember is that changing the VOLUME will NOT change the rate constant, k.

Hope this helps.

Dr. Jim Romano

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gooperwooper

The rate constant, k, can be changed by several parameters such as catalysts, pressure, solvents, light intensity, and temperature. An important point to remember is that changing the VOLUME will NOT change the rate constant, k.

Hope this helps.

Dr. Jim Romano
thanks. So would it be safe to say anything that changes the rate of the reaction would also change the rate constant?

aLemon

thanks. So would it be safe to say anything that changes the rate of the reaction would also change the rate constant?
No, the rate of the reaction is expressed by the general equation: rate= k[A]^x[C]^y, where x and y are the orders with respect to A and C. If you change the concentration of either A or C, the rate will change accordingly. However, the rate constant does not change. You can determine what parameters change the rate constant by looking up the Arrhenius equation. The Arrhenius equation accounts for how the activation energy (Ea) and temperature affect the rate constant.

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orgoman22

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thanks. So would it be safe to say anything that changes the rate of the reaction would also change the rate constant?
As a general rule, that is correct. However, don't forget changing concentration will NOT change the rate law.

Dr. Romano

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Thanks guys!