18.1 orders, rate equations and rate constants Flashcards Preview

Fckn Chemistry Module 5 > 18.1 orders, rate equations and rate constants > Flashcards

Flashcards in 18.1 orders, rate equations and rate constants Deck (14):
1

How are reaction rates measured?

By observing changes in qualities of reactants/products over time

2

Rate=

Change in conc / time

3

Rate units=

Mol dm ^-3 s^-1

4

[A] =

Concentration of A

5

Rate of a particular reactant?

Rate = [A]^n

6

For rate=[A]^n, if n=0 then...

0 order reaction with respect to A

7

Does changing concentration of a 0 order reaction have any affect of the overall rate?

No

8

For rate=[A]^n, if n=1 then...

1st order reaction with respect to A

9

Does changing concentration of a 1st order reaction have any affect of the overall rate?

Yes, if conc x2 then rate x2

10

For rate=[A]^n, if n=2 then...

2nd order reaction with respect to A

11

Does changing concentration of a 2nd order reaction have any affect of the overall rate?

Yes, if conc x2, then rate x4

12

What is the rate equation?

Rate=k[A]^n[B]^m

13

What is rate constant k?

Proportionately constant

14

How is the overall order calculated?

Sum of orders with respect to each reactant