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March 25, 2017

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1) The reaction A + B + C = products has a rate law rate = k times A times C squared. Which of the following will result in an increase in the rate constant for the reaction?

#1 - increasing the temperature
#2 - adding a catalyst
#3 - doubling the concentration of reactant C

I think that all three of these answers are correct. Would you agree?

  • Chemistry(Please check) - ,

    The why would the concentration of any reactant change the rate constant?

  • Chemistry(Please check) - ,

    I just thought that if the concentration was doubled there would be more molecular collisions which would increase the rate law. So only the first two are correct then?

  • Chemistry(Please check) - ,

    there is a difference between the rate constant, and the rate. Changing concentration affects rate.

  • Chemistry(Please check) - ,

    Oh ok I understand, thank you.

  • Chemistry(Please check) - ,

    So wouldn't a catalyst just speed up the rate too and not the rate constant?

  • Chemistry(Please check) - ,

    Yes, that's what a catalyst does. It does not change k.

  • Chemistry(Please check) - ,

    so then answers 2 and 3 are not correct?

  • Chemistry(Please check) - ,

    That's right. 2 and 3 are not right.

  • Chemistry(Please check) - ,

    Ok, thank you for your help!!

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