The Many Faces of Gold: Properties, Production, and Ecological Risks

Gold, a yellow, glossy, and durable metal, is highly conductive and resistant to corrosion. It reacts only with aqua regia and is found in pure form in rocks or as an alloy with silver. Gold mining involves cyanide leaching, primarily in South Africa, the Urals, and Australia. However, it poses ecological risks, such as the contamination of water bodies. Gold finds extensive usage in industries like chemicals, computers, medicine, and even in spacecraft and electronics. Gold salts are compounds used in chrysotherapy for purification and therapy.

• Gold
• Properties
• Production
• Ecological Risks
• Usage

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1. Gold Dominika Pjeczkov , 3.BA

2. yellow, glossy, very durable, highly conductive, soft metal not subject to corrosion Inert = it does not react with any chemical agents resistance

3. reacts only with aqua regia (in a ratio of 3:1, HCl : HNO3) resistant to acids, bases and salts But dissolves in the presence of oxygen in alkaline cyanide solutions gold content in carats -purity rate do not produce a characteristic flame colour

4. OCCURRENCE Due to its inertness, it occurs only as pure metal in rocks or in an alloy with silver (electrum)

5. MINERALS Krennerite (AuTe2) Sylvanite (AgAuTe 2)

6. PRODUCTION Rice bearings gold mining is done by cyanide leaching of gold-bearing rocks The original bearings hydrothermal processes gold is intruded into quartz veins and ingrown into pyrite on gold- bearing veins The world's richest sites are in South Africa, the Urals, Australia

8. ECOLOGICAL RISKS OF GOLD MINING contamination of the Danube cyanide from Romanian hydrometallurgical operations in the 90s of the 20th century natural disaster - hundreds of tons of dead fish and animals breaking the life balance of a territory for decades.

9. USAGE in the chemical industry as a catalyst COMPUTERS - in the microprocessor MEDICINE - dentistry,implants

10. THE UNIVERSE- spacecraft,suits, especially helmets ELECTRONICS - telecommunications technology,calculators, mobile phones or computers

11. COMPOUNDS GOLD SALTS - ( ionic chemical compounds) - "Chrysotherapy" and "aurotherapy HAuCl4 -purification of gold AuCl3 - photography

12. THANK YOU :)