BRAINCAKEEnthalpy Level Diagrams
Enthalpy level diagrams represent enthalpy changes and show the relative levels of energy of the reactants and products.
The vertical axis is the enthalpy and the horizontal axis is labelled 'progress of the reaction'.
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Key terms in this lesson
- Enthalpy
- A measure of the heat energy stored in a chemical system.
- Exothermic
- Describes a reaction in which energy is transferred from the system to the surroundings, so the enthalpy change is negative.
- Endothermic
- Describes a reaction in which energy is transferred from the surroundings to the system, so the enthalpy change is positive.
More in Energetics
- Endothermic and Exothermic Reactions
- Enthalpy Change ΔH
- Physical States of Reactants and Products
- Standard Enthalpies
- Measuring the Enthalpy Change of A Reaction
- Simple Colorimeter
- Flame Colorimeter
- Neutralisation Reactions
All 24 lessons in Energetics · All AQA AS-level Chemistry topics