Magnesium Oxide

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{| width="300" border="1" cellpadding="2" cellspacing="0" align="right"|+Properties|- colspan=2 align=center| colspan=2 |
Magnesium oxide|-! colspan="2" align=center bgcolor="#FFDEAD"|
General

|-| Name || Magnesium oxide|-| Chemical formula ]oxide|-| Common Reaction || 2Mg + O2 → 2MgO|-| color || White, Powder|-! colspan="2" align="center" bgcolor="#FFDEAD" |
Physical

|-| Atomic weight || 40.3044 g/mole (unit)|-| Melting point ] (2800 celsius)|-| Boiling point ] || 3.58 kilogram/decimetre3|-| Crystal structure ] || 0.00062 gram in 100 g water|-! colspan="2" align="center" bgcolor="#FFDEAD" |
Thermochemistry

|-| Standard enthalpy change of formation || ? joule/mol|-| Standard enthalpy change of formation || -601 kJ/mol|-| Standard molar entropy || 32.51 J/(mol·K)|-! colspan="2" align="center" bgcolor="#FFDEAD" |
Misc.

|-| Thermal conductivity ]G. K White, J. Phys D, 1973, 6, 2070 || 9.84 ×10-6/K at 0 °C|-| Specific heat capacity ] || 9.65 at 1 Megahertz|-| Young's modulus ]|-| Shear Modulus || 155 GPa|-| Bulk modulus ] || 0.18|-! colspan="2" align="center" bgcolor="#FFDEAD" |
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.|-! colspan="2" align="center" bgcolor="#FFDEAD" |
SI units were used where possible. Unless otherwise stated, Standard temperature and pressure conditions were used.Inorganic table information|}

Magnesium oxide, or magnesia, 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 . It is formed by an ionic bond between one magnesium and one oxygen atom. Magnesium oxide is easily made by burning magnesium ribbon which forms a powder, when magnesium burns it emits a bright white light. Applications It is used by many libraries for preserving books, and as an insulator in Mineral-insulated copper-clad cable. It is also used as a medication to relieve heartburn, sore 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 crucibles.

Magnesium oxide is a principal ingredient in construction materials used for fireproofing.

It is used as a reference white colour in colorimetry. The emissivity value is about 0.9

Pressed MgO is used as an optical material. It is transparent from 300 nm to 7 µm. The refractive index is 1.72 at 1 µm. It is sometimes known by the Eastman Kodak trademarked name Irtran-5, although this designation is long since obsolete. Crystalline pure MgO is available commercially and has small use in infra-red optics.

Magnesium oxide (electrical grade) is used extensively in electrical heating industry. There are several mesh sizes available and most commonly used ones are 40 and 80 mesh per the American Foundry Society. The extensive use is due to its high di-electric strength and average thermal conductivity. MgO is usually crushed and compacted with minimal airgaps or voids. The electrical heating industry also experimented with Aluminium oxide but is not used now.

Magnesium oxide is also used in animal feeding industry and there are special grades available. MgO is hygroscopic in nature and care must be taken to protect it from moisture. Magnesium hydroxide (Mg(OH)2) which forms in the presence of water can be reversed by heating to separate moisture.

In medicine, magnesium oxide is used as a magnesium supplement, to improve symptoms of indigestion, or as a short-term laxative (to evacuate bowels prior to some surgeries). Side effects may include nausea and cramping.

Magnesium oxide is also a promising insulator for use in devices that exhibit the Tunnel magnetoresistance effect. The crystal structure of MgO matches the crystal structure of Fe and Co.

Precautions Inhalation of magnesium oxide fumes can cause metal fume fever.

See also Related materials calcium oxide, barium oxide, Magnesium sulfide.

References

External links

National Pollutant Inventory - Magnesium Oxide Fume Fact Sheet
NIH medicinal use
Data page at UCL
Ceramic data page at NIST
Emissivity

National Pollutant Inventory - Magnesium Oxide Fume Fact Sheet
NIH medicinal use
Data page at UCL
Ceramic data page at NIST
Emissivity

Magnesium oxide - Wikipedia, the free encyclopedia
Magnesium oxide, or magnesia, 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 O.

Magnesium Oxide (MgO) - Crystran Ltd - Optical Component Specialists
Magnesium Oxide (MgO) - Crystran Ltd specialises in the manufacture of optics for Infra Red & Ultra Violet applications. We make optics for both research and producti

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magnesium oxide
How do atoms of magnesium react with molecules in air to form compounds? Magnesium ribbon burns in air with an extremely bright white light, giving off a ...

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Definition: magnesium oxide from Online Medical Dictionary
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mass = 0 · 417 x 40 = 16 · 67 g of magnesium oxide. This is the answer! 10 g of magnesium burnt in air will give ...

magnesium oxide definition of magnesium oxide in the Free Online ...
magnesium oxide: see magnesia magnesia, common name for the chemical compound magnesium oxide, MgO. It occurs as colorless, cubic crystals. It is refractory, melting at about 2,800 ...