Enthalpy

• assumptions of calorimetry

  no heat transfer

  no heat absorption or release

  same specific heat capacity

  isolated system
• Why is the bond dissociation value inaccurate?

  averaged energy values that only apply to gasses
• For a chemical reaction to occur, what 3 things must happen?

  close enough to break apart

  collide with sufficient energy

  proper collision geometry
• what does the rate of reaction depend on

  frequency of collisions

  proportion of effective collision
• what are the 5 tenants of kinetic molecular theory

  particles are in constant movement

  point mass

  no IMF

  elastic collisions

  kinetic energy is proportional to temperature
• catalyst function


  alternate pathway that allows for a reaction to occur at a lower activation energy
• STP 


  100kpa

  273K

  1moldm^-3 for all solutions

  all substances in standard states
• SATP


  100kPa

  293K
• gas deviates from ideal behavior 


  high pressure: particles have a finite volume

  low temperature: IMFs overcome the low kinetic energy of the particles