RateEquationsandOrders
onsideranyreactionwhereoneofthereactantsisA.Byexperiment,therateof
C
reactioncanberelatedtotheconcentrationofA
Order ZeroOrder FirstOrder SecondOrder
n 0 1 2
Theeffect Reactionrateproportionalto Reactionrateproportionalto Reactionrateproportional
[A]0 (=1),soratenotaffected [A] to[A]2
bychangestoA
[A]x2 Rateunchanged Ratex2 Ratex22 (x4)
[A]x3 Rateunchanged Ratex3 Ratex32(x9)
[A]x10 Rateunchanged Ratex10 Ratex102(x100)
[A]÷2 Rateunchanged Rate÷2 Rate÷22 (÷4)
ConsideringareactionbetweenAandB
xA+yB→products
, rderofreaction =powertowhichgivenconcentrationisraisedinrateequation
O
Overallorderofreaction =sumofpowersofconcentrationintermsofrateequation
Valuesofmandn(above)canonlybefoundexperimentally
Canhaveacatalystintherateequation(oraproduct→autocatalysis)
=rateconstantofareaction
K
Onlythingthataffectskisthetemperature