Chemical formula of calcium oxide is CaO.
Physical Properties of Calcium Oxide (CaO):
| Properties |
Details |
| Appearance |
White, crystalline solid |
| Boiling Point |
Decomposes at high temperatures (above 2,572°C or 4,662°F) |
| Crystal Structure |
Cubic |
| Density |
3.34 g/cm³ |
| Electrical Conductivity |
Insulator (non-conductive) |
| Melting Point |
2,572°C (4,662°F) |
| Odor |
Odorless |
| Solubility |
Insoluble in water |
| Specific Heat Capacity |
40.0 J/(mol·K) |
| State of Matter |
Solid |
| Thermal Conductivity |
Low |
Chemical Properties of Calcium Oxide (CaO):
| Properties |
Details |
| Acid-Base Properties |
Strong base; reacts with acids to form calcium salts |
| Chemical Formula |
CaO |
| Chemical Reaction with Water |
Reacts vigorously with water to form calcium hydroxide (Ca(OH)₂) |
| Hygroscopicity |
Absorbs moisture from the air, forming calcium hydroxide and becoming slaked |
| Oxidation State |
Calcium exhibits an oxidation state of +2 in calcium oxide |
| Reactivity |
Highly reactive; reacts exothermically with acids and can cause burns |
| Reactivity with CO₂ |
Reacts with carbon dioxide (CO₂) in the air to form calcium carbonate (CaCO₃) |
Reaction Of Calcium Oxide with Alkali Metal
| Alkali Metal |
Chemical Symbol |
Reaction with Calcium Oxide |
| Lithium |
Li |
CaO + 2Li → Li2O + Ca |
| Sodium |
Na |
CaO + 2Na → Na2O + Ca |
| Potassium |
K |
CaO + 2K → K2O + Ca |
| Rubidium |
Rb |
CaO + 2Rb → Rb2O + Ca |
| Cesium |
Cs |
CaO + 2Cs → Cs2O + Ca |
Reaction Of Calcium Oxide with Alkaline Earth Metal
| Alkaline Earth Metal |
Chemical Symbol |
Reaction with Calcium Oxide |
| Beryllium |
Be |
No reaction |
| Magnesium |
Mg |
CaO + Mg → MgO + Ca |
| Calcium |
Ca |
No reaction |
| Strontium |
Sr |
CaO + Sr → SrO + Ca |
| Barium |
Ba |
CaO + Ba → BaO + Ca |
| Radium |
Ra |
CaO + Ra → RaO + Ca |
Reaction Of Calcium Oxide with Transition Metal
| Transition Metal |
Chemical Symbol |
Reaction with Calcium Oxide |
| Scandium |
Sc |
No reaction |
| Titanium |
Ti |
CaO + Ti → TiO2 + Ca |
| Vanadium |
V |
CaO + V → V2O5 + Ca |
| Chromium |
Cr |
CaO + Cr → Cr2O3 + Ca |
| Manganese |
Mn |
CaO + Mn → MnO + Ca |
| Iron |
Fe |
CaO + Fe → FeO + Ca |
| Cobalt |
Co |
No reaction |
| Nickel |
Ni |
CaO + Ni → NiO + Ca |
| Copper |
Cu |
CaO + 2Cu → 2CuO + Ca |
| Zinc |
Zn |
CaO + Zn → ZnO + Ca |
| Silver |
Ag |
CaO + 2Ag → Ag2O + Ca |
| Gold |
Au |
No reaction |
| Mercury |
Hg |
CaO + Hg → HgO + Ca |
Reaction Of Calcium Oxide with Non-Transition Metal
| Non-Transition Metal |
Chemical Symbol |
Reaction with Calcium Oxide |
| Hydrogen |
H |
CaO + H2O → Ca(OH)2 |
| Helium |
He |
No reaction |
| Carbon |
C |
CaO + C → CaC2 + CO |
| Nitrogen |
N |
No reaction |
| Oxygen |
O |
2CaO + O2 → 2CaO2 |
| Fluorine |
F |
CaO + 2F2 → CaF2 + O2 |
| Neon |
Ne |
No reaction |
| Chlorine |
Cl |
CaO + 2Cl2 → CaCl2 + CO2 |
| Argon |
Ar |
No reaction |
| Bromine |
Br |
CaO + 2Br2 → CaBr2 + CO2 |
| Iodine |
I |
CaO + 2I2 → CaI2 + CO2 |
| Xenon |
Xe |
No reaction |
Reaction Of Calcium Oxide with Non-Metal
| Non-Metal |
Chemical Symbol |
Reaction with Calcium Oxide |
| Hydrogen |
H |
CaO + H2O → Ca(OH)2 |
| Helium |
He |
No reaction |
| Carbon |
C |
CaO + C → CaC2 + CO |
| Nitrogen |
N |
CaO + 2N → Ca3N2 |
| Oxygen |
O |
2CaO + O2 → 2CaO2 |
| Fluorine |
F |
CaO + 2F2 → CaF2 + O2 |
| Neon |
Ne |
No reaction |
| Chlorine |
Cl |
CaO + 2Cl2 → CaCl2 + CO2 |
| Argon |
Ar |
No reaction |
| Bromine |
Br |
CaO + 2Br2 → CaBr2 + CO2 |
| Iodine |
I |
CaO + 2I2 → CaI2 + CO2 |
| Xenon |
Xe |
No reaction |
| Phosphorus |
P |
CaO + P4 → Ca3P2 + 2Ca |
| Sulfur |
S |
CaO + S → CaS + CO2 |
| Selenium |
Se |
CaO + Se → CaSe + CO2 |
| Bromine |
Br |
CaO + 2Br2 → CaBr2 + CO2 |
| Iodine |
I |
CaO + 2I2 → CaI2 + CO2 |
Reaction Of Calcium Oxide with Metalloid
| Metalloid |
Chemical Symbol |
Reaction with Calcium Oxide |
| Boron |
B |
CaO + B2O3 → CaB4O7 |
| Silicon |
Si |
CaO + SiO2 → CaSiO3 |
| Germanium |
Ge |
CaO + GeO2 → CaGeO3 |
| Arsenic |
As |
CaO + As2O3 → Ca3(AsO4)2 |
| Antimony |
Sb |
CaO + Sb2O3 → Ca3Sb2O7 |
| Tellurium |
Te |
CaO + TeO2 → CaTeO3 |
| Polonium |
Po |
CaO + PoO2 → CaPoO2 |
| Boron |
B |
CaO + 2B → CaB2 + O2 |
| Silicon |
Si |
2CaO + Si → Ca2SiO4 |
| Germanium |
Ge |
2CaO + Ge → Ca2GeO4 |
| Arsenic |
As |
2CaO + As → Ca3As2O8 |
| Antimony |
Sb |
2CaO + Sb → Ca3Sb2O8 |
| Tellurium |
Te |
2CaO + Te → CaTeO3 + Ca |
| Polonium |
Po |
No reaction |
Reaction Of Calcium Oxide with lanthanides
| Element |
Reaction with Calcium Oxide |
| Cerium |
CeO2 + CaO → CaCeO3 |
| Europium |
Eu2O3 + 3CaO → 2EuCaO3 |
| Lutetium |
Lu2O3 + 3CaO → 2LuCaO3 |
| Gadolinium |
Gd2O3 + 3CaO → 2GdCaO3 |
| Lanthanum |
La2O3 + 3CaO → 2LaCaO3 |
Reaction Of Calcium Oxide with actinides
| Element |
Reaction with Calcium Oxide |
| Uranium |
U3O8 + 6CaO → 3UO2·2CaO + 2Ca3UO6 |
| Plutonium |
PuO2 + 2CaO → PuCa2O4 |
| Americium |
AmO2 + 2CaO → AmCa2O4 |
| Thorium |
ThO2 + 2CaO → Ca2ThO4 |
| Curium |
Cm2O3 + 3CaO → 2CmCaO3 |
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