metals form which type of oxides
Answers
Explanation:
Learning Objective
Discuss the chemical properties of oxides.
Key Points
Metal oxides typically contain an anion of oxygen in the oxidation state of −2.
Noble metals (such as gold or platinum) are prized because they resist direct chemical combination with oxygen, and substances like gold (III) oxide must be generated by indirect routes.
The surface of most metals consists of oxides and hydroxides in the presence of air.
Metals tend to form basic oxides, non-metals tend to form acidic oxides, and amphoteric oxides are formed by elements near the boundary between metals and non-metals (metalloids).
Terms
passivationThe spontaneous formation of a hard non-reactive surface film (usually an oxide or nitride) that inhibits further corrosion.
oxideA binary chemical compound of oxygen with another chemical element.
cokeSolid residue from roasting coal in a coke oven; used principally as a fuel and in the production of steel, and formerly as a domestic fuel.
Chemical Properties of Oxides
An oxide is a chemical compound that contains at least one oxygen atom and one other element in its chemical formula. Metal oxides typically contain an anion of oxygen in the oxidation state of −2. Most of the Earth’s crust consists of solid oxides, the result of elements being oxidized by the oxygen in air or water. Hydrocarbon combustion produces the two principal carbon oxides: carbon monoxide (CO) and carbon dioxide (CO2). Even materials considered pure elements often develop an oxide coating. For example, aluminum foil develops a thin skin of Al2O3 (called a passivation layer) that protects the foil from further corrosion.