GOLD Margita Smělá, Tereza Peprná

HISTORY 4000 B.C. – 1. mention of using gold in Europe B.C. – 1. mention of using gold in Europe B.C. – International bussines from Egypt 1500 B.C. – International bussines from Egypt 1091 B.C – Money in China 1091 B.C – Money in China 50 B.C. – Aureus 50 B.C. – AureusInstrument-prostředekIndigenous-pocházejícíApoint-ustanoveno

HISTORY 1284 – Ducat in Venice 1284 – Ducat in Venice 1803 – gold fever 1803 – gold fever 1887 – method of separation gold from mineral 1887 – method of separation gold from mineral 1927 – discovering positive effects on disease 1927 – discovering positive effects on diseasePayment-platidloFever-horečka

Physical properties Phase – solid Phase – solid Density – 19,3 g·cm-3 Density – 19,3 g·cm-3 Melting point – 1337,33 K ( °C) Melting point – 1337,33 K ( °C) Boiling point – 3129 K Boiling point – 3129 K (2856 °C) (2856 °C) Magnetic ordering - diamagnetic Magnetic ordering - diamagnetic Heat and electrically conductive Heat and electrically conductiveDensity-hustotaConductive-vodivý

Chemical properties Name, Symbol, Number – Name, Symbol, Number – gold, Au, 79 gold, Au, 79 Standard atomic weight – Standard atomic weight – gmol gmol1 Electron configuration – Electron configuration – [Xe] 4f14 5d10 6s1 [Xe] 4f14 5d10 6s1 Crystal structure - cubic face centered Crystal structure - cubic face centered Oxidation states – I, III Oxidation states – I, III Electronegativity-2.54 Electronegativity-2.54

Reactions Gold is unchangeable on the air, it doesn´t react with majority nonmetals. Gold is unchangeable on the air, it doesn´t react with majority nonmetals. It disolves in aqua regia: It disolves in aqua regia: It disolves also in solution of cyanides alkaline metals: It disolves also in solution of cyanides alkaline metals: Unchangeable-neměnný; aqua regia-lučavka královská;

Appearance and Retrieval Crust of the Earth Crust of the Earth Salt water Salt water In the space In the space In minerals as a native metal. In minerals as a native metal. South Africa, Australia, Canada and Siberia South Africa, Australia, Canada and Siberia Crust of the Earth-zemská kůra Native metal-ryzí kov

Using of Gold Monetary exchange, jewelery Monetary exchange, jewelery The gold content of gold alloys is measured in carats (k), pure gold being designated as 24k The gold content of gold alloys is measured in carats (k), pure gold being designated as 24k It is used as rust prezervation It is used as rust prezervation Glass industry, microelectronics Glass industry, microelectronics Gold alloys are used in restorative dentistry, especially in tooth restorations, such as crowns. Gold alloys are used in restorative dentistry, especially in tooth restorations, such as crowns. Monetary-peněžní; Content-obsah; alloys-slitiny; Rust-koroze Restorative dentistry-posilující zubní lékařství

Compounds of gold Gold(III) chloride-AuCl 3 Gold(III) chloride-AuCl 3 Molar mass – 303,325g/mol Molar mass – 303,325g/mol The most common compounds of gold The most common compounds of gold Preparation by direct chloration of the metal. Preparation by direct chloration of the metal. 2 Au + 3 Cl 2 2 AuCl 3 Exists as a dimer Exists as a dimer It is catalyzer for many reactions It is catalyzer for many reactions

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