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Enthalpy Changes P18

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AS - Level Chemistry AS (1.1 Formulas and Equations) Mind Map on Enthalpy Changes P18, created by pianolol3 on 11/02/2014.
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Mind Map by pianolol3, updated more than 1 year ago
pianolol3
Created by pianolol3 almost 11 years ago
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Enthalpy Changes P18
  1. Delta H (energy change) = the heat energy transferred in a reaction at constant pressure
    1. Standard Questions= 100kpa pressure and 25'c
      1. Exothermic=energy given out
        1. Delta H =Negative
          1. E.g. Oxidation Reactions
            1. E.g. Combustion
          2. Endothermic=energy taken in
            1. Delta H=Positive
              1. E.g. Thermal Decomposition
                1. E.g. Photosynthesis
                2. Enthalpy Profile Diagrams
                  1. The LESS ENTHALPY a substance has, the MORE STABLE it is
                  2. Activation Energy, Ae = the minimum energy needed for a reaction to occur
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