Chemistry A-Level
Exothermic
What Exothermic means in Chemistry A-Level, as defined for OCR.
Definition of Exothermic
Check what you remember
Read the wording for your board, then hide it and explain Exothermic in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: OCR
A reaction in which the system loses enthalpy to the surroundings, so the surroundings warm and ∆H carries a negative sign.
Topics that use Exothermic
- Enthalpy changes (OCR A-Level)
Related terms
- ∆H of combustion
- ∆H of formation
- Activation energy
- Approximate estimate
- Average bond enthalpy
- Averaging over gaseous compounds
- Bond breaking and bond making
- Bond enthalpy
Using Exothermic in the exam
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