Difine the following :-
mineral, ores, alloy, amalgam
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Answers
Minerals are solid substances that are present in nature and can be made of one element or more elements combined together (chemical compounds). Gold, Silver and carbon are elements that form minerals on their own. They are called native elements.
Ore is natural rock or sediment that contains one or more valuable minerals, typically containing metals, that can be mined, treated and sold at a profit. Ore is extracted from the earth through mining and treated or refined, often via smelting, extract the valuable metals or minerals.
an alloy is an admixture of metals, or a metal combined with one or more other elements. For example, combining the metallic elements gold and copper produces red gold, gold and silver becomes white gold, and silver combined with copper produces sterling silver.
Dental amalgam is a liquid mercury and metal alloy mixture used in dentistry to fill cavities caused by tooth decay.[1] Low-copper amalgam commonly consists of mercury (50%), silver (~22–32%), tin (~14%), zinc (~8%) and other trace metals.[2][3]
Amalgam filling on first molar
Dental amalgams were first documented in a Tang Dynasty medical text written by Su Gong (苏恭) in 659, and appeared in Germany in 1528.[4][5] In the 1800s, amalgam became the dental restorative material of choice due to its low cost, ease of application, strength, and durability.[6]
In July 2018 the EU prohibited amalgam for dental treatment of children under 15 years and of pregnant or breastfeeding women.
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