what if Metal comes out rust is it a chemical or physical change?
146495
if metal rusts, the iron is being oxidized so it is a chemical change.
551973
TO CAUSE THE CHANGE CHEMICAL REACTION
348776
Buy a metal polish, and use it to remove the rust.
890588
Ferrous metals (iron/steel) rust and non-ferrous (aluminum/copper) metals oxidize.\nBoth are chemical reactions and effects of oxygen and moisture present in the atmosphere.\nBTW, ferrous metals are magnetic, non-ferrous metals aren't. Try it.
364252
Blood does not contain enough iron to rust (rust is FeO2).  Rust is caused by the synthesis reaction:\n\n             Fe  +  O2 -------> FeO2\n\nWithout the right circumstances this will not happen, the right circumstances being that there be enough iron there for the reaction to occur.
154339
I am guessing you mean stainless steel. Stainless means that it resits staining  normal oils, soaps, the mild acids found in open air and persipation (human sweat),  that rust or stain normal metals such as iron, copper, sterling silver. Etching or engraving usually very strong acids such as hydrochloric (HCl).
550059
Rust is the substance formed when iron compounds corrode in the presence of oxygen and water. It is a mixture of iron oxides and hydroxides. Rusting is a common term for corrosion, and usually corrosion of steel.\n\nIron is found naturally in the ore haematite as iron oxide, and metallic iron tends to return to a similar state when exposed to air, (hydrogen, oxygen, nitrogen, etc.) and water. This corrosion is due to the oxidation reaction when iron metal returns to an energetically favourable state. Energy is given off when rust forms. The process of rusting can be summarized as three basic stages: The formation of iron(II) ions from the metal; the formation of hydroxide ions; and their reaction together, with the addition of oxygen, to create rust.\n\nIron is the main component of steel and the corrosion of steel is observed more frequently, since iron is rarely used without alloying in the present day.\n\nWhen steel contacts water, an electrochemical process starts. On the surface of the metal, iron is oxidized to iron(II):\n\n    Fe → Fe2+ + 2e−\n\nThe electrons released travel to the edges of the water droplet, where there is plenty of dissolved oxygen. They reduce the oxygen and water to hydroxide ions:\n\n    4e− + O2 + 2H2O → 4OH−\n\nThe hydroxide ions react with the iron(II) ions and more dissolved oxygen to form iron oxide. The hydration is variable, however in its most general form:\n\n    Fe2+ + 2OH− → Fe(OH)2\n    4Fe(OH)2 + O2 → 2(Fe2O3.xH2O) + 2H2O\n\nHence, rust is hydrated iron(III) oxide. Corrosion tends to progress faster in seawater than fresh water due to higher concentration of sodium chloride ions, making the solution more conductive. Rusting is also accelerated in the presence of acids, but inhibited by alkalis. Rust can often be removed through electrolysis, however the base metal object can not be restored through this method.
845186
Basically anything eroding via dissolving.  A cave is a great example.\n\nRust and potholes are NOT chemical weathering.  Rust is a chemical change, but nothing is going away.  Potholes are mainly mechanical (cars do the eroding).
730355
Why not? Iron and oxgen form a number of compounds of both determinate and indeterminate composition. Someone want to give me the exact formula for rust?
488684
a physical change is changing the appearance of something... like if you melt ice, techincally it's still ice, just in a different form... you can ALWAYS change something back when you change it physcially\n\na chemical change is just the opposite. its cahnging the chemical balances of something and you can't change it back... like if you burn wood... the wood turns to ask and you can never get that ash back into wood.
87902
salt doesnt have as much effect on rust.... where rust comes from is oxygen reacting with the iron in your vehicle....\n\nso when water (H20) comes in contact with iron (Fe) it creates iron oxide...rust(FeO2)
255642
In the case of metals what happens is that the protons "steal" the electrons of the metal to evolve a H2, or hydrogen gas, in doing so, the metal for example Fe, turns to Fe++ which will dissolve, if the acid used is HCL then you'll get as products H2  and Iron Chloride, if the acid is sulfuric, you'll get H2 and Iron Sulfate. This is completely electrochemical, whereas when an acid attacks  cement is just chemical, and what evolves is carbon dioxide, with skin, I'm not so sure.
696386
well it depends on the metal the bin is made of. If its made of a metal below Zn in the electrochemical series, then the Zn is oxidised (rusts) in preference to the metal the bin is made of. This is known a sacrificial protection, as the layer of Zn is 'sacrificed'
156880
if iron comes into contact with moisture and air, it starts to rust.The surface of iron is painted because it prevents iron from coming into contact with air and moisture.
836528
they will rust. metal does that when it gets cold have water on it.
147407
Rusting is a chemical process that, can take place in metals exposed to the atmosphere. Not all metals however rust. Rusting is common with the metal, iron. Certain conditions in the air around a metal have to be present for iron to rust. Iron rust which, generally appears brown, is itself a chemical compound quite different from the iron itself. The rusting of iron can be prevented. In towns and large cities where iron sheets are used for roofing houses, rusting can also take place if the iron sheets are not protected from rusting. \n\nRust 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. Iron (or steel) rusting is an example of corrosion -- an electrochemical process involving an anode (a piece of metal that readily gives up electrons), an electrolyte (a liquid that helps electrons move) and a cathode (a piece of metal that readily accepts electrons). When a piece of metal corrodes, the electrolyte helps provide oxygen to the anode. As oxygen combines with the metal, electrons are liberated. When they flow through the electrolyte to the cathode, the metal of the anode disappears, swept away by the electrical flow or converted into metal cations in a form such as rust.\n\nFor iron to become iron oxide, three things are required: iron, water and oxygen. Here's what happens when the three get together:\n\nWhen a drop of water hits an iron object, two things begin to happen almost immediately. First, the water, a good electrolyte, combines with carbon dioxide in the air to form a weak carbonic acid, an even better electrolyte. As the acid is formed and the iron dissolved, some of the water will begin to break down into its component pieces -- hydrogen and oxygen. The free oxygen and dissolved iron bond into iron oxide, in the process freeing electrons. The electrons liberated from the anode portion of the iron flow to the cathode, which may be a piece of a metal less electrically reactive than iron, or another point on the piece of iron itself.\n\nThe chemical compounds found in liquids like acid rain, seawater and the salt-loaded spray from snow-belt roads make them better electrolytes than pure water, allowing their presence to speed the process of rusting on iron and other forms of corrosion on other metals.
469303
Steel does not decompose.  It turns into rust by oxidation; that is, it is an irreducible element that joins with oxygen, another irreducible element, into ferric oxide [rust].  How long this takes depends on a lot of things, like the thickness of the steel, the amount of water available for the oxidation, the amount of oxygen available, what kind of environment it is in...\n\nTin is not made of anything, it is an irreducible element in itself.  By itself it is not toxic, or has very little toxicity.  But when combined with other things, the combination can have poisonous effects, damaging various organs such as liver, brain, blood...