kinetics

• rate of reaction


  change in conc of reactant or product with time
• why is vol of water varied

  to ensure that total vol of reactant mixture in each experiment is constant, so that initial conc of each reactant in reaction mixture is directly proportional to its vol used
• rate equation


  a mathematical equation that relates the rate of reaction to conc of reactants raised to appropriate power
• rate constant (k)


  a proportionality constant in the rate equation of the reaction
• order of reaction wrt a reactant

  power to which concentration of that reactant is raised to in the rate equation
• overall order of reactant

  sum of the powers of the concentrations of reactants are raised to in the rate equation
• half-life


  time required for concentration of limiting reactant to decrease to half its initial concentration
• rate determining step

  slowest step in the reaction mechanism of a multi-step reaction (highest Ea)
• hetro catalysts

  1. adsorption of reactant particles onto active sites of catalytic surface
  2. increases conc of reactants and weakens cov bonds in molecules
  3. Ea lower than uncatalysed reaction
  4. desorption
• haber process


  250 atm, 450 degrees, Fe (s) catalyst