Endothermic reactions around us
Now some processes that absorb heat.
Photosynthesis
Green plants absorb solar energy to make simple sugar. Photosynthesis is an endothermic process.
6CO2 (g) + 6H2O (l) → C6H12O6 (s) + 6O2 (g)
in sunlight, with chlorophyll
Thermal decomposition
Breaking many compounds down by heating is endothermic too. Quicklime is made by heating limestone, and heat is absorbed.
CaCO3 (s) → CaO (s) + CO2 (g)
heat is absorbed