topic 2 energetics

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  • topic 2 energetics
    • endothermic
      • take in heat
  • exothermic
    • topic 2 energetics
      • endothermic
        • take in heat
    • enthalpy change is negative
  • enthalpy change is positive
    • gives out heat
      • exothermic
        • enthalpy change is negative
    • energy transferred
      • energy transferred = mass x temp change x specific heat capacity
    • definitions
      • enthalpy change is the overall energy exchanged with the surrounding when a change happens at constant pressure and the final temp is the same as the initial temp
        • definitions
        • specific heat capacity is the energy needed to raise the temperature of 1g of the material by 1k
          • Hess's  law
            • the enthalpy change in converting reactants to products is the same regardless of the route taken providing the initial and final conditions are the same
          • Hess's law steps
            • Hess's  law
              • the enthalpy change in converting reactants to products is the same regardless of the route taken providing the initial and final conditions are the same
            • step 1- set up the Hess's cycle
              • step 2- put the numbers into the cycle
                • step 3 work out enthalpy change

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