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Reaction kinetics G12

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  • We can identify the order of a reaction in three ways. Explain it!
    plot a graph of reaction rate against concent of reactant, graph of concent of reactant against time & Deduce successive t1/2 from graphs of concent x time
  • Answer this question below
    2A + B—> D ; 1st equation. Its means the rate of reaction is determined by the concentration of A and B in the first step ; rate =k[A][B]
  • State the order for the following picture
    Second order
  • Explain the steps in heterogeneous catalysis
    Diffusion, adsorption, reaction, desorption, diffusion
  • State the unit of rate constant
    Unit of k = s^-1
  • Write the rate equation for this reaction and state the overall order for the reaction
    Rate=k[B]^2 [C] ; overall order =3; unit of k = dm^6 mol^-2 s^-1
  • What is the general rate reaction equation for blue line?
    Rate = k [A]^1
  • Use this data to calculate the rate constant [H2O2]=0.03 M, [I^-1] = 0.01 M, initial rate of reaction 5.30 x 10^-6. The rate equation for this reaction is k [H2O2] [I^-1]
    0.0177 mol dm^3 mol^-1 s^-1
  • State the unit k corresponding to the following rate equation, rate = k[H2][I2]^2
    k = s^-1 mol^-2 dm^6
  • What is the order for each concentration below
    [D]^0 [E]^1
  • What is the definition of half life (t1/2) ?
    The time taken for the amount (or concentration) of the limiting reactant in a reaction to decrease to half its initial value
  • Write the overall reaction & identify any catalyst and intermediate on this reaction!
    2H2O —> 2H2O + O2 ; cat= I^- intermediate =IO^-; biomolecular; rate=k [H2O2]
  • Answer this question
    Homogeneous catalyst bcs same phase with reactants
  • Use the formula t1/2 = 0.693/k to calculate a value for the rate constant of a reaction which is first order and has a half life of 480 s
    1.44 x10^-3 s^-1
  • Explain 3 factors that effectively increase reaction rate !
    -the concentration of the reactants are increased -the temperature is increased -a catalyst is added to the reaction mixture
  • Why half life for the first order reaction is independent of concentration?
    t1/2 = 0.693 / k, not depended on concentration
  • A first order reaction has a rate constant of 9.63x10^-5 s^-1. Calculate a value for the half life of this reaction.
    7200
  • Answer this question
    Rate = k [O2] [NO]^2 ; unit of k is dm^6 mol^-2 s^-1
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