Summary Notes - Y2 Kinetics

‭Kinetics‬‭Y2‬



‭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