why does metal rust in cold water while it doesn't in a warm one?

Question

please help me...i need it badly..thanks

Answer 1

it'll rust in both, maybe just takes longer in warm water

Answer 2

Maybe lower oxygen content in hot water versus cold water, thus lowers the rate of oxidation taking place in hot water?? I'm watching this one...

Here:

Iron (or steel) corrodes more quickly than most other transition metals and readily does so in the presence of both oxygen (in air) and water to form an iron oxide. You can do simple experiments to show that BOTH oxygen and water are needed. Put an iron nail into (1) boiled water in a sealed tube; (2) a tube of air and a drying agent; (3) an open test tube with water. Rusting appears overnight with (3) only.
Rusting is speeded up in the presence of salt or acid solutions because of an increased concentration of ions. Corrosion is a redox process involving redox electron transfer and ion movement. The rusting metal behaves like a simple cell and more ions enable the current, and hence the electron transfer, to occur more readily.
Rusting is overall ... Fe(s) + O2(g) + H2O(l) ==> Fe2O3.xH2O(s) i.e. rust is a hydrated iron(III) oxide formed from the reaction with oxygen and water (the equation is not meant to be balanced and the amount of water x is variable, from dry to soggy!).
The reaction proceeds via (i) iron(II) hydroxide Fe(OH)2 which is (ii) oxidised further to the hydrated Fe2O3, or if very soggy, it amounts to the formation of iron(III) hydroxide!
The reactions can be summarised in terms of hydroxide formation e.g.
(i) 2Fe (s) + 2H2O (l) + O2 (g) ==> 2Fe(OH)2 (s)
(ii) 4Fe(OH)2 (s) + 2H2O (l) + O2 (g) ==> 4Fe(OH)3 (s)
Rusting is an oxidation because it involves iron gaining oxygen (Fe ==> Fe2O3) or atoms of iron losing electrons (Fe - 3e- ==> Fe3+).

Answer 3

Warm water contains less oxygen.

Answer 4

in the warm water,there was no more oxygen that can perform rust,oxide.

Answer 5

NO U R WRONG IT DOES IN BOTH