what is the term for oxidized copper? (ie. green stuff on roof tops)?
407391
When Copper Oxidizes, it turns green over a long time...  This is called "Patina"...
945221
You will get a greenish precipitate of copper carbonate, which is definitely a chemical change - a new substance has been formed.
100074
"rusts" are actually metallic oxides. Ferrous oxide is reddish brown. Zinc oxide is white. Aluminum oxide is whitish gray.
606036
First of all, copper si very good electricity conductor so, is commonly used in electrical installations, but it's coroded in free contact with oxigen an humidity which creates oxides (something like rust on iron). These oxides (unlike the iron rust) are very compact and they are practically waterproof protecting the copper material to be oxidazed further, but is very poor electricaly conductive. Instead, the tin material makes oxides by the same process, but they are very very thin (because of greater compactity)--order of microns, or thousent part of a milimeter-- and the electrical current can pass trough.\nDfriend :)
821724
Rusting of iron is an oxidation/reduction process which means there is a transfer of electrons.  Any soluble ionic compound will facilitate the transfer of the electrons and accelerate the oxidation process.
478467
Chemicals usually change when they are exposed to air because they oxidize. Metals like iron and copper oxidize. As iron oxidizes, it turns into a reddish-brown substance called iron oxide (rust). Copper oxidizes to make a green substance called copper oxide. Since copper is a major component in bronze, bronze turns green when exposed to air as well. This is why the Statue of Liberty is green. Many of these chemicals are not dangerous but many are but not many come in contact with us.
744353
CuXO4 can either mean:\n\nCuSO4 - Copper(II) sulfate\n\nor\n\nCuSeO4  - Cooper (II) selenate
459768
I believe that is one of the available silica textiles.  It is likely the small rectangle of material I purchased to place beteen a wooden wall and a copper pipe to prevent a fire when I had to use a butane torch to solder (sweat) a copper fitting an inch away from the wall!  Worked great and it was reusable (many times).  It has an aluminum backing for strength and moldability.
248240
Tobacco tar isn't the same as what you put on your roof as a sealant (which is more likely to be "pitch", a petroleum by-product).  Tar is just a generic term for the sticky organic by-product of burning tobacco leaves that tends to remain in the lungs -- obviously not good for the health.
410825
Others have had similar problems and solved them.  See the link.  In general, metals (especially iron and its alloys) rust when exposed to moisture in the presence of oxygen.  The rust is a loose collection of molecules that allow more moisture and oxygen to reach the base metal.  For example, you can shine aluminum but it will quickly dull with oxidation.  The aluminum corrosion however forms a tenacious film that protect the metal from additional corrosion.  I heard that copper (flashing?) on a rooftop can cause aluminum gutters to corode.  Various alloys of iron (steel) including heat treatments may impart various corrosion properties, however, chrome is usually added to form stainless steels that best resists rusting.  Silicon steel may have to be protected.  Good luck.
26549
sulfur dioxide\nsulfur dioxide\ncoffe shop owner
607761
It is called as Blue Vitriol\na copper salt made by the action of sulfuric acid on copper\n oxide
379742
Galvanising iron is nothing but a process of coating iron with a thin layer of zinc by electroplating. The main idea behind this is that zinc is a 'sacrficial metal' as it is highly electropositive.\n\nWhat actually happens when you expose normal 'ungalvanized' iron to the atmosphere is that it reacts with oxygen and moisture to form a mixture of iron oxides(rust).\n\nOn the other hand, when galvanized iron is exposed to the atmosphere, it is in fact not the iron, but the ZINC which is exposed to the atmosphere. Now it is ZINC, which undergoes oxidation(not iron as in the case above). This leads to the formation of  a thin film of zinc oxide over the actual zinc(which was coated over iron). Zinc oxide acts as a protective layer and prevents further amount of zinc(or iron) from being exposed to the atmosphere.\n\nSo that's the whole story behind 'Why galvanized iron lasts longer than ordinary iron'. \n\nAnd 'IBL' or whoever you are, please do not copy essays from encyclopedias. Even if you do, have at least the minimum decency and courtesy to copy 'relevant' information.\n\nIt's an insult to ppl who really know chemistry out here.
646167
cotton swap with rubbing alcohol or  fingernail polish or there's this stuff that get's glue off of things i thinks it's called GLOO BE GONE or something like that. you can find it at WAL-MART i think in automotives or crafts, or maybe school supplies.
79044
Here is a centralized page of information, with several links along the left side for more information:\nhttp://www.webelements.com/webelements/elements/text/Cu/key.html
418443
Copper can react with nitric acid on two different ways based on the concentration of nitric acid.\n\nIf cold and dilute nitric acid is used, then the reaction yields copper(II) nitrate, nitrous oxide(N2O) and water.\n\nCu + HNO3 ----- Cu(NO3)2 + N2O + H2O\n\nIf hot and conc. nitric acid(a stronger oxidising agent) is used, the reaction yields copper(II) nitrate, nitrogen dioxide(NO2) and water.\n\nCu + HNO3 ----- Cu(NO3)2 + NO2 + H2O\n\nP.S. - Balance the equations yourself(might take some time but use the oxidation no. method)
136542
One sure way is by the pollution generated by vehicles using the motorway. All the carbon mono oxide produced by the vehicles is increasing the size of the ozon layer hole and the result is the green house effect i.e. drastic changes in the weather of the world