Energetics

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Chem 2 Mindmap am Energetics, erstellt von jlow17 am 06/04/2014.
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Zusammenfassung der Ressource

Energetics
  1. Bonds Made
    1. energy realeased
      1. combustion of fuels
        1. oxidation of C6H12O6
        2. exothermic
          1. negative enthalpy
        3. Bonds Broken
          1. Enothermic
            1. Positive ethalpy
              1. Absorbs Energy
                1. Thermal decompositon of CaC03
                  1. Photosynthesis- sunlight supplies E
              2. Standard enthalpy change of reaction
                1. Is enthalpy change when 1 Mol reacts under standard conditions of their standard states.
                2. Bond enthalpy
                  1. accurate
                    1. as bond actually exists
                      1. O=O
                  2. Mean Bond enthaply
                    1. is the energy need to break (or dissociate) a bond averaged over many different molecules.
                      1. when bonds actually exsist on there own
                        1. C-H
                    2. Enthalpy Change
                      1. Heat energy transferred in a reaction at constant pressure in KJmol^1
                      2. ΔH=sum of(bonds broken-bonds made)
                        1. Always give KJmol^1 to 1 d.p
                          1. -126.0 KJmol^1
                            1. Exothermic
                            2. +267 KJmol^1
                              1. enothermic
                          2. Standard Enthalpy changeof formation
                            1. enthaply change when 1 Mol of a compound is formed from its elements in their standard states under standard conditions
                              1. i.e 2C+ 3 H2 +0.5O2 --> C2H5OH
                            2. Standard enthalpy change of combustion
                              1. enthalpy change when 1 Mol of a substance is completely burned in Oxygen under standard conditions
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