Question

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?

Answer 1

The why would the concentration of any reactant change the rate <i>constant</i>?

Answer 2

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?

Answer 3

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

Answer 4

Oh ok I understand, thank you.

Answer 5

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

Answer 6

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

Answer 7

so then answers 2 and 3 are not correct?

Answer 8

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

Answer 9

Ok, thank you for your help!!