Gold, commonly known as gold, a symbol of chemical element is AU, which is a metal with yellow luster. Gold has good physical attributes, stable chemical properties, high ductility and scarce quantity. It is not only for special currency for reserves and investment, but also the jewelry, electronics industry, modern communication, aerospace and other departments and other departments Important materials. The gold often exists in the state of natural gold. Natural gold containing silver and copper impurities is essentially different from the alloys of these metals. Metal is a product that is coagulated after metal melting. Therefore, it has a homogeneous structure. Natural gold is precipitated from the aqueous solution. Natural gold sometimes covers a layer of iron oxide film. In this case, the color of gold may be brown, dark brown, and even yellow. This kind of gold generally has a parcel layer. This package layer is not just an iron oxide, sometimes it may be some fine granules attached to the surface of the golden grain. This packaging layer not only affects the recognition of gold, but also makes it difficult to treat it (mercury hybridization or cyanide).
n00:00 / 00: 1370% shortcut keys to describe space: Play / pause ESC: Exit full screen ↑: increase volume 10% ↓: decreases by 10% →: Single fast forward 5 seconds studio Here you can drag no longer appear in the player settings to reopen the small window shortcut key description
Gold has good conductivity and thermal conductivity. Gold's conductivity is second only to silver and copper, ranking third in metal, and 74%of the heating rate is silver. The chemical properties of gold are very stable. Gold will not be oxidized by oxygen at low temperature or high temperature. At normal temperature, gold and separate inorganic acids (such as hydrochloric acid, nitric acid, sulfuric acid) do not work, but mixed acids, such as Wang Shui (triple serum hydrochloric acid and one part of nitric acid), and cyanide solution can be well good. Dissolt gold. The melting point of the gold is 1063 ° C. If heating gold to nearly dissolved points, gold can be melted like iron. The thin gold grains can be melted into pieces, and when the gold powder is low, the pressure must be added Together. Gold can form alloys with other metals, such as gold and silver alloy, gold and copper alloy, gold and silver copper alloy. In addition, there are so -called gold mercury alloys. The gold often exists in the state of natural gold. Natural gold containing silver and copper impurities is essentially different from the alloys of these metals. Metal is a product that is coagulated after metal melting. Therefore, it has a homogeneous structure. Natural gold is precipitated from the aqueous solution. The natural gold sometimes covers a layer of iron oxide film. In this case, the color of gold may be brown, dark brown, and even yellow. The gold generally has a parcel layer. This package layer is not just an iron oxide, and sometimes it may be some fine grain stones attached to the surface of the golden grain. This packaging layer not only affects the recognition of gold, but also makes it difficult to treat it (mercury hybridization or cyanide).
Gold, commonly known as gold, a symbol of chemical element is AU, which is a metal with yellow luster. Gold has good physical attributes, stable chemical properties, high ductility and scarce quantity. It is not only for special currency for reserves and investment, but also the jewelry, electronics industry, modern communication, aerospace and other departments and other departments Important materials.
The gold often exists in the state of natural gold. Natural gold containing silver and copper impurities is essentially different from the alloys of these metals. Metal is a product that is coagulated after metal melting. Therefore, it has a homogeneous structure. Natural gold is precipitated from the aqueous solution. Natural gold sometimes covers a layer of iron oxide film. In this case, the color of gold may be brown, dark brown, and even yellow. This kind of gold generally has a parcel layer. This package layer is not just an iron oxide, sometimes it may be some fine granules attached to the surface of the golden grain. This packaging layer not only affects the recognition of gold, but also makes it difficult to treat it (mercury hybridization or cyanide).
1. Thousands of gold
The gold jewelry with a amount of 99.9%metal, engraved with 999 or thousands of foot gold seals.
2. Gold jewelry with a gold content of 99%, engraved with 99%or foot gold.
3.18k gold
Thenters with 75%gold ingredients, and the remaining 25%are other precious metals There are 18K or 750 mark engraved.
Gold is a valuable metal,
n00:00 / 00: 1370% shortcut keys to describe space: Play / pause ESC: Exit full screen ↑: increase volume 10% ↓: decreases by 10% →: Single fast forward 5 seconds studio Here you can drag no longer appear in the player settings to reopen the small window shortcut key description
Gold has good conductivity and thermal conductivity. Gold's conductivity is second only to silver and copper, ranking third in metal, and 74%of the heating rate is silver. The chemical properties of gold are very stable. Gold will not be oxidized by oxygen at low temperature or high temperature.
At normal temperature, gold and separate inorganic acids (such as hydrochloric acid, nitric acid, sulfuric acid) do not work, but mixed acids, such as Wang Shui (triple serum hydrochloric acid and one part of nitric acid), and cyanide solution can be well good. Dissolt gold. The melting point of the gold is 1063 ° C.
If heating gold to nearly dissolved points, gold can be melted like iron. The thin gold grains can be melted into pieces, and when the gold powder is low, the pressure must be added Together. Gold can form alloys with other metals, such as gold and silver alloy, gold and copper alloy, gold and silver copper alloy. In addition, there are so -called gold mercury alloys.
The gold often exists in the state of natural gold. Natural gold containing silver and copper impurities is essentially different from the alloys of these metals. Metal is a product that is coagulated after metal melting. Therefore, it has a homogeneous structure. Natural gold is precipitated from the aqueous solution.
The natural gold sometimes covers a layer of iron oxide film. In this case, the color of gold may be brown, dark brown, and even yellow.
The gold generally has a parcel layer. This package layer is not just an iron oxide, and sometimes it may be some fine grain stones attached to the surface of the golden grain. This packaging layer not only affects the recognition of gold, but also makes it difficult to treat it (mercury hybridization or cyanide).