1, sodium oxide

Sodium oxide, molecular weight 61.979, off-white amorphous flakes or powder, melting point 1275 ℃, boiling point 1950 ℃, density 2.3 grams per cubic centimeter. Sodium oxide is sensitive to moisture, easy to deliquesce, and reacts violently with water to form sodium hydroxide. Sodium oxide in the dark red hot melt, in more than 400 degrees Celsius when decomposed into sodium peroxide and sodium monomer.

2, calcium oxide

Calcium oxide (calcium oxide), is a kind of inorganic compounds, its chemical formula is CaO, commonly known as quicklime. Physical properties are surface white powder, impure gray, containing impurities yellowish or gray, with hygroscopicity.

3, barium oxide

Barium oxide (Barium oxide), molecular formula for BaO, molecular weight is 153.33. It is colorless cubic crystal. It is colorless cubic crystal, soluble in acid, insoluble in acetone and ammonia. It is colorful cubic crystal, soluble in acid, insoluble in acetone and ammonia, and becomes barium hydroxide with water. In the air, it can easily absorb water and carbon dioxide to form barium carbonate. Toxic!

4, potassium oxide

Potassium oxide, colorless cubic crystal. Density 2.32g/cm3, 350 ℃ decomposition, easy to deliquescence, soluble in water and with water to generate potassium hydroxide. It is mainly used in inorganic industry, and is the basic raw material for the manufacture of various potassium salts such as potassium hydroxide, potassium sulfate, potassium nitrate, potassium chlorate and potassium alum.

5, magnesium oxide

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

Magnesium oxide has a high degree of fire-resistant insulation properties. After 1000 ° C or more high temperature burning can be transformed into crystals, rise to 1500 - 2000 ° C into dead burned magnesium oxide (also known as magnesia) or sintered magnesium oxide.