kinetics

• Rate of reaction 


  amount of substance used up in a given time
• Activation energy


  the minimum amount of energy needed for a reaction to start
• In order for particles to react ... is required

  • sufficient energy
  • correct orientation
  • can't react if energy is less than Ea
• Molecules with less energy eventually decompose

  • they gain energy, due to collisions
• How does slight increase in temperature increase ROR?

  • have enough energy
  • more molecules have energy equal to or greater than Ea
• Why might ROR decrease over time?

  Fewer collisions, reactants are used up
• Catalyst


  substance that increases the rate of reaction without getting used up
• How do catalysts work?

  provide alternate pathway and reduces Ea
• How to know if something is a catalyst?

  • remains unchanged
  • offer alternate route
  • not included in overall equation because regenerated
• What does increase temp do to ROR?

  • increase ROR
  • more particles more energy larger or equal to Ea
  • more successful collisions in a given time
• How does increase conc/pressure increase ROR?


  • more particles in a given volume, particles are closer together
  • more successful collisions in a given time
• How does increase SA increase ROR?

  • collision frequency increases
  • more successful collisions
  • more exposure/ contact
• Increasing conc in exothermic conditions

  • concentration increase, temperature increases
  • more successful collisions at a given time
  • increase rate of reaction
• Area under curve of Maxwell Boltzmann curve represent total no. of molecules
• Maxwell Boltzmann curve starts at the origin because no molecule have no energy