GIBBS' FREE ENERGY

• HOW TO CALCUALTE GIBBS FREE ENERGY?

  enthalpy change - (temperature x entropy change)
• WHAT IS TEMPERATURE MEASURED IN?

  Kelvin
• WHAT MUST GIBBS FREE ENERGY EQUAL FOR A REACTION TO BE FEASIBLE?

  <0
• WHEN IS A NEGATIVE ENTHALPY CHANGE AND POSITIVE ENTROPY CHANGE FEASIBLE?

  any temperature
• WHEN IS A POSITIVE ENTHALPY CHANGE AND NEGATIVE ENTROPY CHANGE FEASIBLE?

  never
• WHEN IS A NEGATIVE ENTHALPY CHANGE AND NEGATIVE ENTROPY CHANGE FEASIBLE?

  low temperatures
• WHEN IS A POSITIVE ENTHALPY CHANGE AND POSITIVE ENTROPY CHANGE FEASIBLE?

  high temperatures
• EXCEPTIONS FOR GIBBS' FREE ENERGY RULES?

  • high activation energy (very slow rate of reaction)
  • kinetically stable systems (no tendency to react)
  • kinetically inert systems (potential to react but very slow rate of reaction (high activation energy))