Magnesium oxide
| File:Magnesium oxide crystals (1350x).jpeg | |
General | |
|---|---|
| Name | Magnesium oxide |
| Chemical formula | MgO |
| 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 | |
| ΔfH0liquid | ? kJ/mol |
| ΔfH0solid | -601 kJ/mol |
| S0solid | 32.51 J/(mol·K) |
Misc. | |
| Thermal conductivity | 42 W m-1 K-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. | |
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Magnesium oxide is a white solid mineral that occurs naturally as periclase and is a source of magnesium. See also oxide. Has an empirical formula of Template:MagnesiumTemplate:Oxygen. It is formed by a 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.
Experiments Using MgO in the Classroom
Use this when discussing the differences between compounds and mixtures, and how compounds are hard to separate
Light the bunsen and put a few drops of magnesium oxide into a test tube. Turn the bunsen burner to the blue flame and put the magnesium oxide under the 'triangle' (where the bunsen burner is the hottest). No matter how long the magnesium oxide stays under the blue flame, it will not produce a chemical change.
External links
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