Enthalpy

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  • Enthalpy
    • Enthalpy Notation
      • Enthalpy change is heat energy transferred in reaction at constant pressure
      • Units = kj/mol
      • Standard conditions = 100kpa and a stated temperature
      • r = reaction, c = combustion, f = formation
    • Exothermic Reactions
      • Give out energy to their surroundings
      • Temperature in reaction usually increases
      • Products of the reaction end up with less energy than the reactants
      • Enthalpy change = negative
      • Oxidation is usually exothermic
    • Endothermic Reactions
      • Take in energy from surroundings
      • Temperature in reaction usually falls
      • Products of reaction have more energy than reactants
      • Enthalpy change = positive

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