An exothermic reaction is a chemical reaction that releases energy in the form of heat. It is the opposite of an endothermic reaction. Expressed in a chemical equation:
reactants → products + energy
Examples of exothermic reactions
- Combustion reactions of fuels
- Neutralization reactions such as direct reaction of acid and base
- Adding concentrated acid to water
- Burning of a substance
- Adding water to anhydrous copper(II) sulfate
- The thermite reaction
- Reactions taking place in a self-heating can based on lime and aluminum
- The setting of cement and concrete
- Many corrosion reactions such as oxidation of metals
- Most polymerisation reactions
- The Haber-Bosch process of ammonia production
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