Kinetics Flashcards
factors that influence reaction rate
- concentration
- physical state
- temperature
reaction rate:
concentration (2)
- molecules must collide to react
- Increase # molecules, increase # of collisions
reaction rate:
physical State
- molecules must mix to collide
- increased Surface Area, faster reaction
reaction rate:
temperature
- molecules must collide with enough energy to react
- Increase temp, increase reaction rate due to ^ in energy
___ [reactants], [products] ____
decrease, increase
Rate equation
rate = k x [A]m x [B]n
m=1
if the rate doubles when [A] doubles
m=2
if the rate quadruples when [A] doubles
m=0
if the [A] doubles but no change in the rate
1st order rate =?
k[A]
2nd order rate=?
k[A]2
zero order rate=?
k
1st order rxn? (2)
ln[A]f-ln[A]i=-kt
ln[A]f=-kt+ln[A]i
2nd order rxn?
1/[A]f=kt+1/[A]i
zero order rxn?
[A]f=-kt+[A]i
half life 1st order
t1/2=ln x 2/k
half life 2nd order
t1/2=1/k[A]i
half life zero order
t1/2=[A]i/2k
arrhenius equation
k=Ae^-EA/RT
as temp ___, # of molecules with a high EA ___
increase, increase
___ EA, ___ product formation
increase, decrease
molecularity
each steps # of reactants
uni-molecular
1 reactant
bimolecular
2 reactants
