OZ4

Measuring Reaction Rate

\[\textup{Rate of Reaction}=\frac{\textup{Change in $x$}}{\textup{Time Taken}}\]

  • Volume of Gas

  • Mass Change

  • pH Change

  • Colorimetry

  • Chemical Analysis using Quenching

Factors affecting Rate

  • Concentration

  • Temperature

  • Radiation Intensity

  • Particle size (SA)

  • Catalyst

Collision Theory of Reactions

  • Reactions occur when particles of reactants collide with a minimum KE

  • This will happen more often if there are more particles in a given volume

  • Not every collision ends in a reaction

  • Only reaction if energy is greater than activation enthalpy.

    Enthalpy Profiles

    • Highest point represents transition state

      • Old bonds stretch and new ones start to form

      • State exists for short period of time