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The reason that rust is considered a chemical change is because the "connections" or the bonds of atoms are changed in the process. When atoms "rearrange themselves" by changing the "connections" or bonds to allow different compounds to be formed, as is the case with the formation of rust, a chemical change has taken place. In iron, the iron atoms are arranged in a metallic crystalline matrix. When rust occurs, oxygen bonds to the iron atoms (which where not chemically bonded to anything before) to create an oxide of iron.

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15y ago
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7y ago

Iron "rusts" when it combines chemically with oxygen to form ferric oxide.

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Q: Why is the change from iron to rust considered a chemical change?
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What is the ability to rust for nitrogen?

The ability to rust is considered a chemical change. Oxidation, a chemical process changes the substance's makeup, causes the rusting.


What happens when iron and oxygen combine to form rust?

Nothing spectacular happens-- this is a chemical change. The useful properties of iron are destroyed when it rusts, so much is usually done to prevent rusting -- i.e painting. other coatings that prevent rust. If you can keep the oxygen away from the iron, it will not rust.Isn't it that it makes iron oxide? or is rust really iron oxide?--different person


Is rust an element compound or mixture?

Actually, Rust is a mixture, of two compounds = Hydrated Iron(III) oxide [Fe2O3.nH2O] and Hydrated Iron(III) oxide-hydroxide [FeO(OH).nH2O] . Both the compounds are red giving colour to Rust.


What is formed when iron combines with oxygen in the air?

Iron reacting with oxygen produces rust, Fe2O3 (Iron (III) oxide) or FeO2 (Iron (II) oxide) depending on the composition of the iron.


Chemical equation for rust?

2Fe(s) + 2H2O(l) + O2(g) ==> 2Fe2+(aq) + 4OH-(aq) This is the equation for rust. ---- NOT EXACTLY Rust is a solid, it doesn't exist as ions in solution. Also, in rust, iron is in the +3 oxidation state. There are three common forms of rust. Rust formed under water is Fe(OH)3. Rust formed in humid air is FeO(OH). Only when rust has completely dehydrated will you see it as Fe2O3. The reaction for the rust that we see around us most often is: 4Fe(s) + 3O2(g) + 2H2O(l) --> 4FeO(OH)(s) FeO(OH) is also formed naturally, and is the mineral called goethite.