With the breakthrough of Old General Shan, Qin Xiu was also greatly surprised, and even faintly felt that the Nine Palaces Battle Array had stronger vitality, and the power of the Nine Palace Battle Array had become stronger.

Old General Shan originally had the strength of the Gang Jin Supreme (Super Martial Arts Skill), that is to say, the eye of this Nine Palace Battle Array, which is what we often call the engine, that is, the tractor-level engine.

Now that General Shan has made a breakthrough, he has reached the national level of generals (junior martial arts skills), that is, the engine at this time has been upgraded to the engine of the C919 large aircraft.

The Jiugong battle array driven by the engine of the C919 large aircraft is naturally much more powerful than the Jiugong battle array driven by the original tractor engine.

The pressure on Qin Xiu can be imagined.

Even if Qin Xiu used the comprehension of the Ten Directions Great Array, it would be difficult to contend with it.

Although Qin Xiu and General Shan are both ................................................................................................................................................................................................

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Silver - precious metal

Category: Currency

Silver, that is, silver, is called silver because of its white color, as opposed to gold. It is often used as currency and decorations. In ancient times, it was called silver when it was used as currency. The color of pure silver is white, mixed with impurities and metallic luster, the quality is soft, and it becomes hard after being mixed with impurities, and the color is gray and red. The specific gravity of pure silver is 10.5, the melting point is 960.5 °C, the conductivity is good, and it is soluble in nitric acid and sulfuric acid. Silver is one of the metals found in ancient times. Although silver also exists in nature, most of it exists in the form of chemical compounds. Silver is highly malleable, so it can be crushed into a transparent foil that is only 0.3 microns thick, and a 1-gram silver grain can be drawn into filaments about two kilometers long. Silver's thermal and electrical conductivity is among the best among metals.

Chinese name

silver

Chemical symbols

Ag

density

10.5g/cm??

melting point

961.93℃

boiling point

2213℃

Providers

Market Business International

directory

1 Silver Importance

2 History of Silver

3. Silver nature

4. Industrial applications

5. Domestic development

6. International market

7 Currency Applications

8 Silver distribution

9 Distinguish platinum

10 silver reserves

11. Output rate

The importance of silver in this paragraph

Pure silver is white in color, mixed with impurities metallic luster, soft, and hardened after being mixed with impurities, color

silver

silver

Gray and red in color. The melting point is 961.93 °C, the boiling point is 2212 °C, and the density is 10.5 g/cm³ (20 °C). Silver is soft, has good flexibility and ductility, ductility is second only to gold, can be pressed into thin sheets, drawn into filaments. Soluble in nitric acid, sulfuric acid. Silver is 91% reflective of light. At room temperature, halogens can slowly combine with silver to form silver halide. Silver does not react with dilute hydrochloric acid, dilute sulfuric acid and alkali, but can chemically react with highly oxidizing acids, concentrated nitric acid and concentrated hydrochloric acid.

The main uses of silver are mainly based on three pillars: industry, photography, and jewelry and silverware. These three categories account for about 85% of the total demand for silver.

Since ancient times, silver has been used as a symbol of wealth, along with gold. The chemical symbol for silver is Ag, which comes from the Latin word Argertum, which means "light, bright". Because the color of silver is white, it is called "silver".

Silver not only has good electrical and thermal conductivity, but also has high photosensitivity and luminescence characteristics, and is used in industry, photography, jewelry, currency manufacturing, etc.

Compared with gold, silver was used in coinage more and earlier because of its abundant supply and lower value, and many countries established the silver standard and used silver coins as the mainstream currency.

This section of the history of silver

In ancient times, humans had an understanding of silver. Silver, like gold, is a precious metal with a long history of application and has been used for more than 4,000 years. Because of the unique excellent characteristics of silver, people have given it a double value of currency and decoration, and the pound sterling and the silver dollar used before the liberation of our country are silver and copper alloys based on silver. In China's Qing Dynasty, 1 tael of silver was equivalent to about 400-500 yuan today.

Silver, on the other hand, is more reactive than gold, and although it is about 15 times more abundant in the earth's crust than gold, it rarely exists in its elemental state, so it was discovered later than gold. In ancient times, people already knew about the mining of silver, and because the amount of silver obtained at that time was small, it was worth more than gold. Between 1780 and 1580 B.C., the Egyptian imperial code stated that silver was worth twice as much as gold, and even in the 17th century, Japanese gold and silver were worth equally. Silver was first used as ornaments and tableware, and only later as currency.

Silver, that is, silver, is called silver because of its white color, as opposed to gold. It is often used as currency and decorations. In ancient times, it was called silver when it was used as currency. Silver, always shining like the moon, the original meaning of silver paper, that is, the meaning of "bright". In China, silver characters are also commonly used to describe white and shiny things, such as Milky Way, ginkgo, silverfish, white fungus, screen, etc.

In ancient China, silver and gold and copper were often juxtaposed, which was called "only gold three products". The book "Yu Gong" records the "only gold three products", which shows that our country found silver as early as the 23rd century BC, that is, more than 4,000 years ago. In nature, silver often exists in the form of pure silver, and people have found a piece of pure silver weighing 13.5 tons! In addition, it also exists in the form of chloride and sulfide, often coexisting with lead, copper, antimony, arsenic and other ores.

This paragraph is silvery

Physical

It is malleable, and it is a metal with good thermal and electrical conductivity. The first ionization energy is 7.576 electron volts. Chemically stable, it has no effect on water or atmospheric oxygen; Soluble in dilute nitric acid, hot concentrated sulfuric acid and hydrochloric acid, molten sodium hydroxide.

Crystal structure: The unit cells are face-centered cubic unit cells, and each unit cell contains 4 metal atoms.

Chemical properties

The characteristic oxidation number of silver is +1, its chemical properties are worse than copper, at room temperature, even when heated, it does not interact with the oxygen in water and air, but it can turn black in the air for a long time and lose its silvery-white luster, this is because of the H?? S synthetic black Ag?? S's sake. The chemical reaction equation is:

4Ag + 2H?? S + O?? = 2Ag?? S + 2H?? O

Silver cannot react with dilute hydrochloric acid or dilute sulphuric acid to release hydrogen, but silver can dissolve in nitric acid or hot concentrated sulphuric acid:

heating

2Ag + 2H?? SO?? (Thick)==== Ag?? SO?? + SO?? ↑+ 2H?? O

Silver reacts very slowly with halogens at room temperature, and halides can be formed under heated conditions:

473K

2Ag + F?? ===== 2AgF dark brown

heating

2Ag + Cl?? ===== 2AgCl white

heating

2Ag + Br?? ===== 2AgBr yellow

heating

2Ag + I?? ===== 2AgI orange

Silver has a strong affinity for sulfur, and can be directly synthesized with sulfur when heated. S:

heating

2Ag + S ==== Ag?? S

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