Quiz Questions on Chemical Reactions: Rate Equations and Steady-State Approximation - Prof, Quizzes of Chemistry

Download Quiz Questions on Chemical Reactions: Rate Equations and Steady-State Approximation - Prof and more Quizzes Chemistry in PDF only on Docsity! Quiz 5 NAME_______________________ Consider a reaction in which molecular species A is transformed to species B and goes through an unstable intermediate, I. A) Write the two independent rate equations for [B] and [I] dt d dt d . [B][I] [B] [B][I]-[I]-[A] [I] 22 2211 − −− −= += kk dt d kkkk dt d ____________________________________________________________________ The concentration of I rises to a low value that remains nearly constant after the initial increae. Application of the steady-state approximation yields: [B][A] [B] bf kkdt d −= B) Express kf and kb in terms of k1, k-1, k2, and k-2. Applying the SS approximation to [I] dt d yields: [B] [A][I] 21 21 kk kk + + = − − Substituting this expression into [B] dt d yields: