BRAINCAKEEnthalpy and Enthalpy Changes
Enthalpy is a measure of the total energy of a chemical system. The enthalpy change of a process is the heat energy that is transferred between the system and its surroundings at constant pressure.
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Key terms in this lesson
- Exothermic
- Describes a process in which heat energy is transferred from the system to the surroundings, so the enthalpy change is negative.
- Endothermic
- Describes a process in which heat energy is transferred from the surroundings to the system, so the enthalpy change is positive.
More in Enthalpy
- Endothermic and Exothermic Reactions
- Activation Energy
- Standard Enthalpy Changes and Standard Conditions
- Enthalpy Change of Reaction
- Enthalpy Change of Formation
- Enthalpy Change of Combustion
- Enthalpy Change of Neutralisation
- Measuring the Enthalpy Change of Combustion
All 19 lessons in Enthalpy · All OCR AS-level Chemistry topics