Calcium Oxide

Addn of water to quicklime has generated temp as high as 800 deg C. Some reports describe reaction as violent. Ignition of sulfur, gunpowder, wood, and straw by heat of quicklime-water reaction has been reported.

Even when cold, fluorine will attack calcium oxide, evolving much heat and some light.

Chlorine trifluoride reacts violently, producing flame, with...calcium oxide.

Liquid hydrofluoric acid and calcium oxide react very violently.

Soluble in water forming calcium hydroxide and generating a large quantity of heat.

Water (liberates heat), fluorine, ethanol [Note: Reacts with water to form calcium hydroxide].

The lime-alcohol residue from preparation of anhydrous alcohol ignited on discharge from the still and caused a vapor explosion. The finely divided and reactive lime may have heated on exposure to atmospheric moisture and caused ignition.

CaO reacts with water to form Ca(OH)2, which partially dissolves, and can react with CO2 to form CaCO3.

The solution in water is a medium strong base. Reacts with water. This generates sufficient heat to ignite combustible materials. Reacts violently with acids, halogens and metals.

Reacts violently with fire extinguishing agents such as water.

The reaction of calcium oxide and boron trifluoride forms a fused mass after warming.

Calcium oxide or sodium hydroxide reacts with phosphorus pentox ide extremely violently when initiated by local heating

Mixtures with ethanol may ignite if heated and thus can cause an air-vapor explosion. Violent reaction with (B2O3 + CaCl2) interhalogens (e.g., BF3, CIF3), F2, HF, P2O5 + heat, water