Magnesium oxide

From Free net encyclopedia

**Properties**
General
Image:Magnesium oxide crystals (1350x).jpeg Magnesium oxide crystals - SEM image (1350x)
Name	Magnesium oxide
Chemical formula	Mg O
Appearance	White, powdery, solid
Physical
Formula weight	40.30 g/mol
Melting point	3073 K (2800 °C)
Boiling point	3873 K (3600 °C)
Density	3.58 kg/dm³
Crystal structure	Cubic FCC
Solubility	0.00062 g in 100 g water
Thermochemistry
Δ_fH⁰_liquid	? kJ/mol
Δ_fH⁰_solid	-601 kJ/mol
S⁰_solid	32.51 J/(mol·K)
Misc.
Thermal conductivity	42 W m^-1K^-1 at 0 °C
Coefficient of thermal expansion	10.8 ×10^-6/K at 0 °C
Specific heat capacity	877 J kg^-1 K^-1
Dielectric constant	9.65 at 1 MHz
Young's modulus	250 GPa
Shear Modulus	155 GPa
Bulk modulus	155 GPa
Poisson's ratio	0.18
Safety
Ingestion	Used as an antacid and/or a laxative. Available over-the-counter.
Inhalation	Causes irritation of upper respiratory tract.
Skin	Causes irritation.
Eyes	Causes irritation.
SI units were used where possible. Unless otherwise stated, standard conditions were used. Disclaimer and references

Image:Magnesium oxide.jpg

Magnesium oxide is a white solid mineral that occurs naturally as periclase and is a source of magnesium. See also oxide. It has an empirical formula of Mg{{#if:{{{1|}}}|_{{{1}}}|}}O{{#if:{{{1|}}}|_{{{1}}}|}}. It is formed by an ionic bond between one magnesium and one oxygen atom.

It is used by many libraries for preserving/deacidifying books, and as an insulator in industrial cables. It is also used as a medication to relieve heartburn, sour stomach, or acid indigestion. Medical uses of Magnesium oxide also include using it as a short-term laxative, or used to supplement a diet with magnesium.

Magnesium oxide is used as a basic refractory material for lining furnaces.

It is used as a reference white color in colorimetry.

Inhalation of magnesium oxide fumes can cause metal fume fever.

[edit]