Q:

# What is the chemical equation for the rusting of iron?

A:

The oxidation reaction of iron and oxygen to form the substance that is commonly called rust occurs according to this equation: 4Fe + 3O2 = 2Fe2O3. Water is also required for this reaction to occur, but because the total amount of water does not change, it is not included in the equation.

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The production of rust is an example of one of the most common chemical reactions on Earth: oxidation/reduction. In this type of reaction, some electrons are transferred from one substance to another. In this case, electrons are being transferred from the iron to the oxygen.

When iron loses three of its electrons to oxygen, it becomes the Fe3+ ion and oxygen becomes the O2- ion. The O2- quickly reacts with H+ ions in water to form H20. The Fe3+ ions also react with water to form iron oxide (Fe2O3), or rust.

Though the net amount of water remains the same in this reaction, the availability of water does limit the oxidation of iron, which is why iron rusts more quickly in a wet environment than a dry one.

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The reaction between silver chloride and ammonia is written as follows: AgCl+NH3↔[Ag(NH3)2]++Cl-. The silver chloride used for this reaction is solid, while the ammonia and the two resulting compounds are in aqueous form. This reaction demonstrates that the silver(I) chloride precipitate is soluble in aqueous ammonia.

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The chemical equation or formula for rust is 4 Fe(OH)3(s). The formula represents the net result of a chemical reaction that occurs between iron, water and oxygen. Rust occurs not only on mostly pure iron but also on alloys that include iron, like steel.

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The chemical equation for the combustion of coal is C + O2 = CO2. In this equation, C represents the carbon in the coal, which reacts with air, represented by O2, to form carbon dioxide, or CO2.