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CHAPTER 7 THERMOCHEMISTRY - Coggle Diagram

- - - - Exothermic
        
        EXOTHERMIC REACTIONS
        
        -ΔH is (-ve)
        -Enthalpy of products < Enthalpy of reactants
        -Heat is released from the system to the surroundings
        Example: combustion, neutralization etc.
      - Endothermic
        
        ENDOTHERMIC REACTIONS
        
        -ΔH is (+ve)
        -Enthalpy of products > enthalpy of reactants
        -Heat is absorbed by the system from the surrounding
        Example: ice melting
  - - - -During a reaction under constant pressure, heat is given out or absorbed
- - - - Constant–Pressure Calorimeter
        -The reaction mixture is insulated from the surroundings by outside Styrofoam cup (it is believed that no heat is lost to the surroundings)
        -The calorimeter and the solution absorb the heat released by the process.
      - Constant–Volume Calorimeter
      - Important Terms in Calorimeter
        Specific heat capacity, c
        -Is the heat necessary to raise the temperature of one gramme of a material by one degree Celsius
      - Heat capacity, C
        -Is the amount of heat necessary to increase the temperature of a given quantity of a material by one degree Celsius
      - Basic Principle in Calorimeter
        Heat released
        by a reaction = heat absorbed by surroundings (calorimeter+water)
        -surroundings may refer to the
        
        calorimeter itself or ;
        
        the water and calorimeter
      - Heat released by
        reaction = Heat absorbed by
        calorimeter+water