Fool s gold

Fool s Gold and the Reductive Citric Add Cycle—The First Metabolic Pathway ... 

A reversed, reductive TCA cycle would require energy input to drive it. What might have been the thermodynamic driving force for such a cycle Wachtershanser hypothesizes that the anaerobic reaction of FeS and H9S to form insoluble FeS9 (pyrite, also known as fool s gold) in the prebiotic milieu could have been the driving reaction ... 

Pyrile (fool s gold) VtSi Dimorphite AS4S3... 

The solids are a graphite rod, a silver bar, a lump of fool s gold (iron sulfide), and iodine crystals. 

Classify each of the following solids as ionic, network, metallic, or molecular (a) iron pyritc (fool s gold), FeS, ... 

The pyrite formed in the above reaction is well known as fool s gold , and was certainly present on the young Earth. 

Iron is also necessary to life. Our blood uses iron compounds to help bring oxygen from the lungs to the cells. Iron compounds are found all over the world, in many forms. One compound of iron looks so much like gold that it is sometimes mistaken for gold, and is therefore called fool s gold. Many scientists believe that about 90 percent of the earth s molten core consists of iron. 

Many iron ores also contain iron sulphide, which is commonly called fool s gold. 

Food/water consumption, in toxicology studies, 25 216 Fool s gold, color, 7 334 Foot-and-mouth disease vaccine, 5 345t Foot preparations, 7 842t Foraflon, 7 641... 

Pyrite (FeS ) is more commonly known as fool s gold. It is used as an iron ore and in the production of sulfur chemicals such as sulfuric acid. 

Sulfur is an element found in many common minerals, such as galena (PbS), pyrite (fool s gold, FeSj), sphalerite (ZnS), cinnabar (HgS), and celestite (SrSO ), among others. About 1/4 of all sulfur procured today is recovered from petroleum production. The majority of sulfur is the result of or a by-product of mining other minerals from the ores containing sulfur. 

The quest for artificial gold has never ended. The Swedish writer August Strindberg convinced himself that he had made it alchemically in 1894 but this at least was one claim susceptible to chemical disproof, for his gold turned out to be a gold-coloured compound of iron a variety of fool s gold. 

Pyrite (FeS2) is often called fool s gold because of its golden yellow color. It contains the disulfide ion (S22-), the sulfur analogue of the peroxide ion (022-). 

Sulfides are usually present as a low-temperature forming, black iron sulfide (FeS) or a high-temperature forming, brown-black iron bisulfide (FeS2). Iron bisulfide can contain flecks of fool s gold, which has a metallic luster. Copper sulfide (CuS), which is a gray, dense, lustrous material, can also be present. Corrosion deposits containing sulfides are usually the result of process contamination. 

Ekins S, Williams AJ (2010) When pharmaceutical companies publish large datasets an abundance of riches or fool s gold Drug Disc Today 15 812-815... 

A miner discovered some yellow nuggets. They weighed 105 g and had a volume of 21 cm3. Were the nuggets gold or fool s gold (pyrite) (The density of gold is 19.3 g/cm3 and that of pyrite is 5.0 g/cm3 at 20°C.) Show your work to justify your answer. 

Balk J, Lill R (2004) The cell s cookbook for iron-sulfur clusters recipes for fool s gold Chem Bio Chem 5 1044-1049... 

Fool s gold is any specimen that looks like gold, but does not contain any of that precious element. Not all specimens of any one mineral species could be called fool s gold, because there are none that could consistently, in all its forms and color variations, be mistaken for gold. The minerals most commonly found as fool s gold are pyrite, chalcopyrite, biotite, marcasite, and pyrrhotite. 

The physical and optical properties of the fool s gold species are summarized and compared with those of gold in Table 2.8. 

---