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Topic 5 (Strand 4:Enthalpy change and the direction of the chemical…

- - - - The energy content of the products is lower than the energy of the reactants. this means the reaction is exothermic and there for the enthalpy change is described as negative. (-deltaH)
    - - 90% of reactions in nature are Exothermic.
      - reactants have more energy than the products
      - products are more stable due to less energy
  - - - The energy content of the product is higher than that of the reactants if the reaction is endothermic and the enthalpy change is described as positive.
    - - Reactants are more stable then the products due to the energy imbalance
- - - - M= the Mass: usually for water
      - C= the specific heat capacity: usually of water (4.18J/Mol/Kg)
      - Delta T= the temperature change: in Kelvin- 273.15 K is 0 degrees C
    - - 101.3 KPa (1A)
      - 1 mol/dm^-1
      - -the specific temperature but often taken as 298K or 25C