Exothermic Reaction
| Formula / Notation | ΔH < 0 (heat released); H_products < H_reactants |
|---|---|
| Also Known As | Heat-releasing reaction, exothermal reaction, combustion (specific type) |
What is Exothermic Reaction?
A chemical reaction that releases heat energy to the surroundings, causing the temperature to increase. The enthalpy change (ΔH) is negative. Examples include combustion, neutralization reactions, and many oxidation reactions. The products have lower energy than the reactants.
Formula & Notation
Other Names / Synonyms: Heat-releasing reaction, exothermal reaction, combustion (specific type)
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
A chemical reaction that releases heat energy to the surroundings, causing the temperature to increase. The enthalpy change (ΔH) is negative. Examples include combustion, neutralization reactions, and many oxidation reactions. The products have lower energy than the reactants.
Exothermic reactions are exploited in: combustion engines and power stations (heat from combustion drives work), instant hot packs (CaCl₂ dissolving), hand warmers (iron oxidation), thermite welding (Fe₂O₃ + 2Al), and industrial reactors (Haber process ammonia synthesis is exothermic).
Highly exothermic reactions are fire and explosion hazards. Industrial scale-up requires heat management (cooling coils, reflux condensers, rate control by feed). Thermal runaway occurs when heat is generated faster than it can be removed. Reaction calorimetry and HAZOP analysis are mandatory before…
The formula or notation for Exothermic Reaction is: ΔH < 0 (heat released); H_products < H_reactants