Energetics (AS)

Cards (9)

  • Exothermic: release energy to surroundings.
    Endothermic: pulls energy in from the surroundings.
  • Standard enthalpy change of combustion (ΔcH°): enthalpy change when one mole of substance is formed from its elements under standard conditions
  • Enthalpy change (ΔH): amount of heat transferred between system and surroundings during reaction at constant pressure
  • Standard enthalpy change of formation (ΔfH°): enthalpy change when one mole of compound reacts completely with oxygen under standard conditions, producing carbon dioxide and water only
  • Heat lost/gained = mass of water x specific heat capacity x change in temperature
  • Hess' Law: The total enthalpy change in a reaction is always the same and is independent of the route taken.
  • A Hess' Cycle
  • Enthalpy change of formation equation.
  • Enthalpy change of combustion equation.