BRAINCAKEHess's Law and Thermochemical Cycles
If a reaction can take place by two routes the total enthalpy change for each route is the same provided that the starting and finishing conditions are the same.
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Key terms in this lesson
- Enthalpy
- A measure of the heat energy stored in a chemical system.
- Enthalpy change
- The heat energy transferred between the system and its surroundings during a process carried out at constant pressure.
More in Energetics
- Flame Colorimeter
- Neutralisation Reactions
- Displacement Reactions
- Allowing for Heat Loss
- The Enthalpy Change of Formation
- The Enthalpy Change of Combustion
- Thermochemical Cycles and Enthalpy Diagrams
- Bond Enthalpies
All 24 lessons in Energetics · All AQA AS-level Chemistry topics