Magnesium Oxide MgO is a compound, and it can be seen from the above that the compound is a pure substance, so it is clear that Magnesium Oxide MgO is a pure substance.

Magnesium Oxide MgO (chemical formula: MgO) is an oxide of magnesium, an ionic compound. It is a white solid at room temperature. Magnesium oxide exists in nature in the form of periclase and is a raw material for magnesium smelting.

Magnesium Oxide MgO is divided into light magnesium oxide and heavy magnesium oxide. Lightweight and loose in volume, it is a white amorphous powder. Odorless, tasteless and non-toxic. Density 3.58g/cm3. Insoluble in pure water and organic solvents, the solubility in water increases due to the presence of carbon dioxide. Soluble in acid and ammonium salt solution. After high temperature burning into crystals. In case of carbon dioxide in the air, magnesium carbonate double salt is formed. Heavy volume is compact, white or beige powder. It is easy to combine with water, and it is easy to absorb moisture and carbon dioxide when exposed to the air. It is easy to gel and harden when mixed with magnesium chloride solution.