Precious metal

properties was reported by Faraday (1857) in his experiments with gold. He used the term “divided metals” to describe the material which he produced. Zsigmondy (1905)describes the formation of a red gold sol which is now understood to comprise particles in the 10 nm size range. Throughout the last century the field of colloid science has developed enormously and has been used to produce many materials including metals, oxides, organic sand pharmaceutical products. Many other well known…

electrons in their outer shell. “This group is called Alkaline Earth metals, they are called this because when they are mixed in solutions, they are likely to form solutions with a Ph greater than 7.” Metal, nonmetal or metalloid?…

The primary focus of the lab was to understand the process and effects of cold working and annealing compared to a baseline sample. Cold working is a form of strain hardening in which metals are worked through the use of applied pressure, thereby making the metal harder[]. This applied pressure led to harder material by creating linear defects known as dislocations. The specific type of dislocation that occurred in this lab was an edge dislocation where an extra plane of atoms was inserted into…

All metal manufacturing includes a solidification process. The metal is either atomised to a powder, or it is cast. There is several casting methods used today. Many of the methods use the mould only once, for example sand mould casting, the lost-wax method and precision casting. For larger quantities of liquid metal, there are basically two methods: ingot casting and continuous casting. Ingot casting normally uses a permanent mould made by cast iron isolated by ceramic material. There are…

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Fluorite, also called fluorspar, is a mineral that is composed of calcium and fluorine. Pure fluorite is colorless. Fluorite is known as the most colorful mineral in the world. Each colored fluorite has its own name. The most common colors for fluorite come in purple, blue, yellow, or green (King, Fluorite.) What makes fluorite colorful depends on what elements are substituting calcium in the crystalline structure. Fluorite is an interesting mineral because of its wide range of uses. People use…

A. Significance Copper is one of the most abundant transition metals in the human body and its redox characteristics make copper an important cofactor in many enzymes. Copper containing enzymes are important for tissue generation, synthesis of neurotransmitters, and catalysis of the electron transfer reactions.1 Because of its diverse functions, copper homeostasis deficiency is linked to many diseases. A prominent example is Wilson’s disease with a prevalence of approximately 1 case in 30,000…

silvery-white presentation, and it is also known that they are all alkali metals. It is also noticed that they are all soft metals easily cut with a knife rather than most metals such as calcium or iron. All three elements are stored within oil, with Sodium as an exception being stored in kerosene, as an attempt to prevent oxidation as metals in group 1 appear to oxidise in the open air quite rapidly. As previously mentioned both metals readily react with oxygen, producing a dull metallic…

than the galvanised nails and the difference in the amount of corrosion in the iron nails are comparable. The galvanised nails slowed down the act of corrosion because the zinc metal that was coated on the nail is more reactive than iron, thus the iron is oxidised. Galvanising stops oxygen and water from contacting the metal…

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