5-bromobenzo[b]thiophene-2-carbaldehyde

Lead and mercury have unique physical properties and are unique among all kinds of substances.
Lead is gray and heavy in color, soft and easy to show, often in a dignified state. Its melting point is quite low, and it melts into a liquid shape after heating for a long time, just like smart water, but it feels thicker than water. Lead has good electrical conductivity, although it is not as good as gold and silver, it is also acceptable in commonly used metals. And lead has good corrosion resistance. Under the erosion of years, its damage is extremely small, so it is often used for protection.
Mercury has a specific shape. At room temperature, it is a liquid metal that flows. It is silver-white and bright, smart and lively, like a silver bead rolling down, slippery and difficult to catch. The density of mercury is very large, and it is extremely heavy. Its boiling point is also low, and it is easy to gasify when exposed to a heat source. It turns into invisible mercury vapor and hides in the air. This is something to be careful about. Mercury can fuse with many metals to form amalgam, which is wonderfully useful in many fields such as metallurgy and chemical industry.
Looking at the physical properties of lead and mercury, the stability and solidity of lead, and the agility and strangeness of mercury, the two have thousands of years. Lead has many uses in construction, power protection and other aspects due to its weight, low melting point, corrosion resistance and electrical conductivity; mercury has played an extraordinary role in chemical industry, instrument manufacturing and other fields due to its liquid state, easy gasification and ability to generate amalgam. The physical properties of the two are different, and their uses are also suitable. They are both unique substances between heaven and earth, which have far-reaching impact on human production and life.

Argon is a chemical element with peaceful properties and is quite unique.
Looking at its stability, argon is extremely stable, and it rarely reacts with other things under normal temperature and pressure. Due to the atomic structure of argon, its stable structure with the outermost electron number of octagon seems to build a strong barrier that is difficult to break by the outside world. The ancients said: "Solid as a rock." The stability of argon is also like this rock, and it is not easy to be moved by other things.
In addition to its inert nature, argon is often regarded as one of the inert gases. In many common chemical reaction scenes, argon is like a hidden person outside and does not participate in it. When the fire is raging, and many substances are ignited and reacted, argon can be calm and not moved by the fire. This inertness makes argon widely used in many fields.
And look at its performance under specific conditions. Although argon is usually inert, under extreme conditions such as extremely high temperatures and extremely strong electric fields, its atomic structure may be affected, and the state of the electron cloud may change. At this time, it may show weak reactivity. However, this situation is extremely rare and requires severe conditions to achieve.
Argon is chemically stable and inert, and it is difficult to chemically change with other substances in ordinary environments. However, under extreme conditions, it may be weakly active. This is the outline of its characteristics.

The method of smelting lead is often to put lead ore into the furnace, accompanied by charcoal, which is fumed and calcined. Lead ores, mostly galena, are black and metallic in color. Break them up and place them in a furnace with charcoal, and the furnace is built with refractory materials.
Burn charcoal to start a fire, and the wind enters the furnace, and the fire will become more and more intense. Charcoal burning generates heat, which makes the furnace temperature gradually rise, and the ore decomposes when heated. Lead contained in lead ore melts when heated, flows out of the ore, flows down the wall of the furnace, and gathers at the bottom of the furnace. In this process, charcoal is used as a reducing agent to remove the oxygen from the ore and reduce the lead to a single substance.
Another method is to roast the lead ore first. The ore is placed in a well-ventilated place and baked by fire, so that the impurities in it evaporate, and the structure of the ore changes, making it easier to react with the reducing agent. Afterwards, charcoal is also used to reduce the roasted ore to obtain lead.
If you want to obtain refined lead, you need to refine it. Often by electrolysis, crude lead is placed in the anode, pure lead is placed in the cathode, and lead-containing salt solution is used as the electrolyte. With an electric current, the crude lead in the anode dissolves, and lead ions move towards the cathode in the solution. Electrons are obtained at the cathode and precipitated, and deposited on the cathode. This electrolysis method can remove many impurities in crude lead and greatly increase the purity of lead. < Br >
There is also a method of metal replacement. If a metal that is more active than lead is added to the solution containing lead ions, such as zinc, the zinc replaces the lead ions to obtain the elemental substance of lead. However, this replacement method is often used in situations where the purity of lead is not very high due to incomplete replacement and the introduction of new impurities, or as a means of preliminary extraction of lead.

In "The Creation of Heavenly Works", the sun flintel is used in many fields.
In the realm of sacrifice, the sun flintel is highly respected. Ancient sacrifices were extremely solemn and related to the communication between people and gods. The sun can gather sunlight to make fire, which is regarded as a sacred and pure thing, and is used to light the incense candles and firewood piles of sacrifices. "Zhou Li · Qiuguan · Si Xuan's" has a record of "Si Xuan's family, the palm of the hand takes the open flame in the sun", and the husband is the sun flintel. With the help of the fire taken by the sun flintel, it adds a sacred and solemn atmosphere to the sacrifice and expresses devotion to the gods.
In military affairs, the sun flintel also has its use. On the battlefield, if you need to make a fire quickly, the sun flintlock can play a key role. When the army sets up camp and needs to make a fire for cooking, heating and lighting, but the traditional way of making a fire is inconvenient or difficult to implement in case of rain and moisture, the sun flintlock can use sunlight to make a fire quickly. In the event of a surprise attack by the enemy, the fire-making characteristics of the sun flintlock may provide convenience for transmitting signals, such as lighting a beacon fire to warn friendly troops.
In daily life, the sun flintlock is also commonly used. In terms of lighting, when there is a lack of lighting tools such as candles, the sun flintlock is used to make a fire to light torches and oil lamps to illuminate the room. When cooking, the fire taken by the sun flintlock is used to heat food and meet dietary needs. And the sun flintlock is not limited by fuel. As long as there is sunlight,
Overall, the sun flintlock played an important role in the fields of sacrifice, military, and life, demonstrating the wisdom of the ancients and the ingenious use of the power of nature.

The state of the market, the price of nail crabs, really depends on various factors.
In today's world, the state of supply and demand is deeply affected by the price of nail crabs. If the crab is in its prime, the seafood is abundant, and there are many nail crabs entering the market, and the supply exceeds the demand, the price will become flat, and the common people can easily get it. On the contrary, when the output of crabs is sparse, it is difficult to find nail crabs in the city. There are many seekers and few suppliers, and the price will be high, and ordinary people may feel it is expensive.
And the origin is different, and the price of nail crabs is also different. In the coastal land, fishing is convenient, and the nail crabs produced are freshly transported into the market. There is no long-distance transshipment fee, and the price is often slightly lower. And in remote places, the nail crabs need to be tossed around, which adds to the cost of transportation and preservation, and the price is high.
Furthermore, the difference in quality is the key to the price. The nail crabs with big flesh and fat, plaster and yellow full body are all vying for purchase, and the price must be high. And those with small body and poor quality are less popular, and the price is also reduced.
As for the season, it also has an effect on the price of the nail crabs. When the crabs are fat in autumn, the taste of the crabs is the most delicious. Everyone wants to try early adopters, the demand increases greatly, and the price is often high. In other times, the price may drop.
The market price of nail crabs changes due to supply and demand, origin, quality, season and many other reasons. Merchants and diners should observe it before they can get it.