Examples of endothermic reactions include the decomposition of ferrous
sulphate, the reaction between baking soda and vinegar, melting of ice,
evaporation of water, sublimation, photosynthesis, and cooking of food. One
commonly cited example is the decomposition of calcium carbonate (thermal
decomposition of limestone):
CaCO3(s)→CaO(s)+CO2(g)\text{CaCO}_3(s)\rightarrow
\text{CaO}(s)+\text{CO}_2(g)CaCO3(s)→CaO(s)+CO2(g)
This reaction absorbs heat, making it endothermic. Cooking food is also an
endothermic process as it requires heat absorption. Thus, typical examples of
endothermic reactions are:
- Decomposition of ferrous sulphate
- Reaction of baking soda and vinegar
- Photosynthesis
- Melting ice to water
- Evaporation of water to vapor
- Cooking food
These reactions absorb heat from their surroundings during the process.