French chemist Marcellin Berthlot (1827-1907) coined the term “endothermic” from Greek roots. An endothermic reaction is a chemical reaction (Reactions that lowers the temperature) that absorbs thermal energy from surroundings to form products. Because of the low temperature, you can feel the cold when the process occurs. The heat is absorbed by the reaction. The opposite of an endothermic reaction is an exothermic reaction. In Endothermic, Enthalpy change (ΔH) is positive. A good example of an endothermic reaction is photosynthesis and the melting of salts.
Endothermic Process Examples
- Cooking an egg
- Baking bread
- Melting ice cubes
- Separating ion pairs
- Melting solid salts
- Sublimation of dry ice into carbon dioxide gas
- Splitting a gas molecule
- Evaporating liquid water
- Making an anhydrous salt from a hydrate
Endothermic Chemical Reactions Examples
- Mixing potassium chloride with water
- Mixing ammonium nitrate with water
- Reaction while dissolving ammonium chloride in water
- The reaction of cobalt(II) sulfate heptahydrate with thionyl chloride (SOCl2)
- Reacting sodium carbonate with ethanoic acid
- The reaction of dry ammonium chloride with barium hydroxide octahydrate crystals
- Cracking alkanes
