What is iron rust?

Answer 1

Rust is a general term for iron oxides formed by the reaction of iron with oxygen. Several forms of rust are distinguishable visually and by spectroscopy, and form under different circumstances. The chemical composition of rust is typically hydrated iron(III) oxide (Fe2O3.nH2O), and under wet conditions may include iron(III) oxide-hydroxide (FeO(OH)). Rusting is the common term for corrosion of iron and its alloys, such as steel. Although oxidation of other metals is equivalent, these oxides are not commonly called rust. As rust has higher volume than the originating mass of iron, its buildup may force apart adjacent parts - a phenomenon known as rust smacking. The rusting of iron is one of the more widely used examples of corrosion. This electrochemical process requires the presence of water, oxygen and an electrolyte and leads to the formation of hydrated iron oxides.

Answer 2

An iron bar rusts. The iron reacts with oxygen in the air to make rust.

We say that the iron has oxidized. The iron has gone from an oxidation state of zero to usually either iron II or iron III. This may be difficult to remember. The easier way to tell if a half reaction is a reduction or oxidation is to plot the changing ion into the number line. If the oxidation state of the ion goes up the number line, it is an oxidation.

Answer 3

Iron rust is a chemical reaction that occurs when iron metal is exposed to oxygen and water, leading to the formation of iron oxide (rust). It weakens the iron material and is commonly seen as a reddish-brown flaky substance on the surface of metal objects.