89.3 The rate equation of reaction with simple order
§9.3 The rate equation of reaction with simple order
Teaching obiectives Acknowledge 1. Discriminate: reactions with/without definite order Reaction with simple order 2. Recite the fundamentals about the firs-/second-/third-/zeroth-order reactions differential and integration form of rate law half-life linear relation 3. Explain the way to determine reaction order. Integration method; differential method, partial order method and isolation method ability: 1. Make calculation and prediction based on rate law 2. Determine reaction order quality Be ware of the possible trap for making error judgement about the order of the reaction
Teaching objectives Acknowledge： 1. Discriminate: reactions with/without definite order. Reaction with simple order. 2. Recite the fundamentals about the firs-/second-/third-/zeroth-order reactions; differential and integration form of rate law; half-life, linear relation. 3. Explain the way to determine reaction order. Integration method; differential method, partial order method and isolation method Ability： 1. Make calculation and prediction based on rate law. 2. Determine reaction order. quality： Be ware of the possible trap for making error judgement about the order of the reaction
89.3 The rate equation of reaction with simple order Reactions with the same reaction order are usually of same kinetic characteristics therefore reactions are usually classified on the basis of reaction order Elementary reaction? verall reaction?
Reactions with the same reaction order are usually of same kinetic characteristics, therefore, reactions are usually classified on the basis of reaction order. Elementary reaction? Overall reaction? §9.3 The rate equation of reaction with simple order
89.3 The rate equation of reaction with simple order 9.3.1 Reaction with simple order The reaction whose rate only depends on H+I=2HI k[H2][2y the concentration of reactants. and both H,+C1=2 HCI r=K[H21[C12 ].5 the partial order and the reaction order is zero or plus integer is reaction with simple [H2]B2 H2+ Br2=2 HBr r=k order 1+k, HBr [Br2] Reaction with definite order Overall Reaction with reactions simple order Reaction without definite order
1 1 2 2 H r k = [H ] [I ] 2 + I2 = 2 HI H2 + Cl2 = 2 HCl 1 0.5 2 2 r k = [H ] [Cl ] H2 + Br2 = 2 HBr 0.5 2 2 2 [H ][Br ] [HBr] 1 ' [Br ] r k k = + Overall reactions Reaction with definite order Reaction without definite order Reaction with simple order §9.3 The rate equation of reaction with simple order 9.3.1 Reaction with simple order The reaction whose rate only depends on the concentration of reactants, and both the partial order and the reaction order is zero or plus integer is reaction with simple order
89.3 The rate equation of reaction with simple order 9.3.2 First-order reaction Example: 1)Decay of isotopes 8Ra>86Rn+2He 2)Decomposition N2O5=N2O4+O2 3)Isomerization
Example: 1) Decay of isotopes 2) Decomposition 226 226 4 88 86 2 Ra Rn He → + 2 5 2 4 2 1 N O N O O 2 = + 3) Isomerization 9.3.2 First-order reaction §9.3 The rate equation of reaction with simple order