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GOLD PowerPoint Presentation

GOLD

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GOLD

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  1. GOLD Margita Smělá, Tereza Peprná

  2. 4000 B.C. – 1. mention of using gold in Europe. 1500 B.C. – International bussines from Egypt 1091 B.C – Money in China 50 B.C. – Aureus Instrument-prostředek Indigenous-pocházející Apoint-ustanoveno HISTORY

  3. HISTORY • 1284 – Ducat in Venice • 1803 – gold fever • 1887 – method of separation gold from mineral • 1927 – discovering positive effects on disease Payment-platidlo Fever-horečka

  4. Physical properties • Phase – solid • Density – 19,3 g·cm-3 • Melting point – 1337,33 K (1064.18 °C) • Boiling point – 3129 K • (2856 °C) • Magnetic ordering - diamagnetic • Heat and electrically conductive Density-hustota Conductive-vodivý

  5. Chemical properties • Name, Symbol, Number – gold, Au, 79 • Standard atomic weight– 196.966g•mol−1 • Electron configuration – [Xe] 4f14 5d10 6s1 • Crystal structure - cubic face centered • Oxidation states – I, III • Electronegativity-2.54

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

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

  8. Using of Gold • Monetary exchange, jewelery • The gold contentof gold alloys is measured in carats (k), pure gold being designated as 24k • It is used as rust prezervation • Glass industry, microelectronics • 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

  9. Compounds of gold • Gold(III) chloride-AuCl3 • Molar mass – 303,325g/mol • The most common compounds of gold • Preparation by direct chloration of the metal. 2 Au + 3 Cl2→ 2 AuCl3 • Exists as a dimer • It is catalyzer for many reactions

  10. Thank you for attention 