Ionic compounds are solids with high melting and boiling points. They are good conductors of electricity but only when dissolved in water. Their crystals are rigid and brittle.

high melting and boiling points. Ionic solids have a high melting point and boiling point because it takes a substantial amount of energy to break the strong ionic bonding that hold the ions together.

Covalent compounds generally have low boiling and melting points, and are found in all three physical states at room temperature. Covalent compounds do not conduct electricity; this is because covalent compounds do not have charged particles capable of transporting electrons.

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Rust is apparently a hydrated form of iron(III)oxide. The formula is approximately Fe2O3•32H2O, although the exact amount of water is variable.

Rust is an oxide of iron . It is basic in nature as metal oxides are basic in nature.

Alison – Rust is the natural state of iron (ferrous oxide). Rust occurs when an exposed area of a ferrous (iron-containing) alloy (like steel) drops below a pH of about 8.2 or 8.3.

Rust is the common name for a very common compound, iron oxide. Iron oxide, the chemical Fe2O3, is common because iron combines very readily with oxygen — so readily, in fact, that pure iron is only rarely found in nature.

For typical steel/iron/cast iron, when the pH is less than about 4, protective oxide films tend to dissolve and corrosion rates increase. When the pH is between about 4 and 10, soil corrosion is independent of pH. When the pH is greater than 10, the metal becomes passive and corrosion rates decrease with increasing pH.

The danger of more acidic water – when the pH is less than 6.5 – is that it can leach metals from the well and from the pipes that bring you water. These metals include lead, manganese, copper and iron, and they can be toxic in large amounts.

It is exceptionally corrosive, but can be stored in containers lined with PTFE (Teflon)….Fluoroantimonic acid.

Materials with a pH greater than 11 are considered a strong base. Bases (or alkalis) such as sodium hydroxide and potassium hydroxide are corrosive because they break down fatty acids in skin tissue and penetrate deeply.

If a solution contains more hydrogen ions than hydroxide ions, it is said to be acidic, and the pH of the solution is less than 7….The pH scale.

Generally speaking, strong acids (pH<2) and some strong bases (pH>12) start to cause caustic damage to the esophagus and various linings of the tract.