BRAINCAKEStandard Enthalpies
Enthalpy changes are measured on a set of standard conditions as the enthalpy changes can vary with temperature, pressure or concentration. These are called standard enthalpy changes ΔHθ
Standard pressure is 100kPa (1 atmosphere of pressure is 101kPa)
Standard temperature is 298K
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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.
- 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
- Enthalpy Level Diagrams
- Measuring the Enthalpy Change of A Reaction
- Simple Colorimeter
- Flame Colorimeter
- Neutralisation Reactions
All 24 lessons in Energetics · All AQA AS-level Chemistry topics