Energetics and Enthalpy

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  • Created by: Jasmin
  • Created on: 10-01-14 11:29
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  • Energetics and Enthalpy Change
    • Enthalpy Change: ( ) hat energy transferred in a reaction at constant pressure: kJ mol-1
    • Standard Conditions: 1 atm pressure, 298K
    • (triangle)H = Hproducts - H reactants
    • Entahalpy level diagrams shows the relative energy levels of reactants and products
    • EXOTHERMIC: negative (trangle)H because products are at a lower energy level than the reactants (products have less energy than reactants)
      • Energy has been given out by the system to the surroundings - the surroundings get hotter
        • E.g. oxidation
      • Diagram
    • ENDOTHERMIC: positive (trangle)H because products are at a higher energy level than the reactants (products have more energy than the reactants)
      • Energy has been absorbed by the system from the surroundings - the surroundings get colder
        • E.g. melting
        • Diagram
    • The less enthalpy a substance has , the more stable it is

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