rate equations

    Cards (12)

    • rate of reaction
      -change in concentration of a reactant or product per unit time
      found by:
      -measuring decrease in the conc of a reactant over time
      -measuring increase in conc of a product over time
    • order of reaction
      -shows how the conc of a reactant affects rate of reaction
      -the power to which the conc of that reactant is raised in the rate equation
    • 0 order
      -no effect on the rate of the reaction and therefore not included in the rate equation at all
    • 1st order
      -the rate is directly proportional to the conc of that reactant
    • 2nd order
      -the rate is directly proportional to the square of the conc of that reactant
    • overall order of a reaction
      -sum of the powers of the reactants in a rate equation
    • half-life
      time taken for the conc of a limiting reactant to become half of its initial value
    • Arrhenius equation
      -shows the relationship between the rate constant, the temperature and the activation energy
      k=Ae^(-Ea/RT)
      k - the rate constant
      A - arrhenius constant
      Ea - activation energy (J mol-1)
      T - temp (K)
      e - mathematical constant
    • rate determining step
      -the slowest step in the reaction
      -if reactant appears in the RDS then the conc of that reactant will also appear in the rate equation
    • bimolecular reaction
      two species involved in the RDS
    • unimolecular reaction
      one species involved in the RDS
    • RDS intermediate
      derived from the substances that react together to form it in the RDS