Download GOLD

GOLD
Margita Smělá, Tereza Peprná
HISTORY
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4000 B.C. – 1. mention of
using gold in Europe.
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1500 B.C. – International
bussines from Egypt
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1091 B.C – Money in China
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50 B.C. – Aureus
Instrument-prostředek
Indigenous-pocházející
Apoint-ustanoveno
HISTORY
1284 – Ducat in Venice
 1803 – gold fever
 1887 – method of
separation gold from
mineral
 1927 – discovering
positive effects on
disease
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Payment-platidlo
Fever-horečka
Physical properties
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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
Chemical properties
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Name, Symbol, Number –
gold, Au, 79
Standard atomic weight –
196.966 g•mol−1
Electron configuration –
[Xe] 4f14 5d10 6s1
Crystal structure - cubic face
centered
Oxidation states – I, III
Electronegativity-2.54
Reactions
Gold is unchangeable on the air, it doesn´t
react with majority nonmetals.
 It disolves in aqua regia:
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It disolves also in solution of cyanides alkaline
metals:
Unchangeable-neměnný; aqua regia-lučavka královská;
Appearance and Retrieval
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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
Using of Gold
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Monetary exchange, jewelery
The gold content of 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
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
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Thank you for attention 