Chemistry AS DF CI 4.1 and 4.3

  • Created by: A.B.
  • Created on: 30-11-13 10:49
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  • DF Enthalpy and Entropy CI 4.1 and 4.3
    • Enthalpy
      • An exothermic reaction gives out energy from the system to the surroundings.The temperature of the surroundings increases.
        • delta H is negative
        • Endothermic opposite
      • Standard enthalpy change of combustion
        • Enthalpy change when 1 mole of a substance burns completely in oxygen under standard conditions.
      • Standard enthalpy change of formation
        • Enthalpy change when 1 mole of a substance is formed from its constituent elements. Both the reactants and products are in their standard state.
      • Other reactions
      • Measuring delta H in laboratory
    • Entropy
      • Measure of the number of ways in which particles can be arranged.
      • Gases have a greater entropy than liquids, liquids have a greater entropy than solids.
      • Mixtures (e.g. in solutions) have a greater entropy than the unmixed constituents.
      • If the number of particles increases during the course of the reaction then entropy usually increases.


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