Singapore gold and silver information
Buying and selling Gold and Silver in Singapore is not hard because there are no more sellers doing this job.
Gold
A chemical element, symbol Au, atomic number 79, and atomic weight 196,967; It is a very dense, soft metal with intense yellow color. Gold is classified as a heavy and noble metal; in trade, it is the most common of the precious metals. Copper, silver, and gold are in the same group on the periodic table. The source of the chemical symbol, Au, is its Latin name aurum (radiant dawn). There is only one stable isotope of gold, with mass number 197.
In Singapore about three-quarters of the world's gold, production is consumed in jewelry that's why gold rates in Singapore are not much high. Its industrial applications, especially in electronics, consume 10-15%. The remainder is divided between medical and dental jobs, minting, and reserves for the government and individuals. Gold coins and other decorative items are actually alloys because the metal is too soft (2.5-3 on the Mohs scale) to be useful with frequent handling.
The 198 radioactive Au is used in medicinal radiation in diagnosis and in some industrial applications as a tracer. It is also used as a tracer in the study of the movement of sediments on the ocean floor and around ports. The properties of gold towards radiant energy have allowed the development of efficient reflectors for infrared heaters and furnaces, as well as for retention and focusing of heat in industrial processes.
Location: Gold is found throughout the world, but it is very scarce so that it is a rare element. Seawater contains low concentrations of gold on the order of 10 parts of gold per billion parts of water. Higher concentrations accumulate in plankton or on the seabed. At present, there are no suitable economic processes for the extraction of marine gold. Metallic, or natural, gold and various telluric minerals are the only forms of gold present on Earth. Natural gold exists in rocks and minerals of other metals, especially quartz and pyrite, or it can be dispersed in sands and gravels (alluvial gold).
Properties: The density of gold is 19.3 times that of water at 20ºC (68ºF), such that 1 m 3 of gold weighs about 19,000 kg (1 ft 3, about 1200 pounds). The masses of gold, like other precious metals, are measured on the Troy scale, which contains 12 ounces per pound. It melts at 1063 ° C (1947.97 ° F) and boils at 2970 ° C (5180 ° F). It is somewhat volatile below its boiling point. It is a good conductor of heat and electricity. It is the most ductile and malleable metal. Transparent sheets, with a thickness of 0.00001 mm, can be easily made or stretched into wires with weights of 0.5 mg / m. Its quality is expressed on the fineness scale as parts of pure gold per thousand parts of total metal, or on the carat scale as parts of pure gold per 24 parts of total metal. Gold dissolves easily in mercury to form amalgams. It is one of the least chemically reactive metals. It does not lose luster, nor does it burn in the air.
Compounds: Gold can have 1+ or 3+ valence in its compounds. The tendency to complex is so strong that all 3+ oxidation compounds are complex. Compounds in the 1+ oxidation state are not very stable and tend to oxidize to the 3+ state or reduce to metallic gold. All compounds of any oxidation state are easily reduced.
In its complexes, gold forms more easily and more stable bonds with halogens and sulfur, less stable with oxygen and phosphorus, and very weak with nitrogen. The bonds between gold and carbon are normally stable, as in complexes of cyanide and various organic.
Effects of Gold on health
Effects of overexposure: Inhalation: May cause irritation if exposure is prolonged or excessive. Ingestion: No adverse effects are expected. Skin: May cause irritation and allergic reaction. Eyes: May cause irritation.
Environmental Effects of Gold
The ecotoxicity of gold has not been evaluated. However, the degradation of gold under aerobic conditions is expected to be very poor and there is no evidence to suggest that it can create ecological problems when dumped into the environment. Since gold is insoluble, it is believed to have minimal bioaccumulation and bioavailability characteristics.
Silver
A chemical element, symbol Ag, atomic number 47, and atomic mass 107,870. It is a greyish-white lustrous metal. From the chemical point of view, it is one of the heavy and noble metals; from a commercial point of view, it is a precious metal. There are 25 isotopes of silver. Their atomic masses fluctuate between 102 and 117.
In most of its applications, silver is alloyed with one or more metals. Silver, which has the highest thermal and electrical conductivities of all metals and Silver Value is increasing, is used in electrical and electronic contact points. It is also widely used in jewelry and various pieces. Among the alloys in which it is a component are dental amalgams and metals for motor bearings and pistons.
In Singapore Silver is a fairly rare element. It is sometimes found in nature as a free element (native silver) or mixed with other metals. However, most of the time it is found in minerals that contain silver compounds. The main silver minerals are argentite, cerargyrite, or silver horn and various minerals in which silver sulfide is combined with sulfides of other metals. Approximately three-quarters of the silver produced is a by-product of the extraction of other minerals, especially copper and lead.
Pure silver is a moderately soft metal (2.5-3 on the Mohs hardness scale), white in color, slightly harder than gold. When polished, it acquires a brilliant luster and reflects 95% of the light that falls on it. Its density is 10.5 times that of water. The quality of silver, its purity, is expressed as parts of pure silver for every 1000 parts of the total metal. Commercial silver has a purity of 999 (0.999 grade).
In Singapore silver is the most chemically active noble metal, it is not very active compared to most other metals. It does not oxidize easily (like iron), but does react with sulfur or hydrogen sulfide to form the well-known tarnished silver. Rhodium plating of silver can prevent this discoloration. Silver does not react with dilute non-oxidizing acids (hydrochloric or sulfuric acids) or with strong bases (sodium hydroxide). However, oxidizing acids (nitric acid or concentrated sulfuric acid) dissolve it by reacting to form the positive ion of silver, Ag +.
Today oil price in Singapore is going to fall because of lockdown. This ion, which is present in all simple solutions of soluble silver compounds, is easily reduced to free metal, as occurs in the deposition of silver mirrors by organic reducing agents. Silver is almost always monovalent in its compounds, but divalent oxides, fluoride, and sulfide are known. Some silver coordination compounds contain divalent and trivalent silver. Although silver does not oxidize when heated, it can be chemically or electrolytically oxidized to form silver oxide or peroxide, a powerful oxidizing agent. Because of this activity, it is widely used as an oxidizing catalyst in the production of certain organic materials.