4-Iodo-N-Butylbenzene

4- The main users of the sands are those who suffer from diseases such as the sands, the sands, and the eyebrows. Their nature, taste, and bitterness are poisonous, but they can be used reasonably and have a miraculous effect.
"Tiangong Sands"
: The sands, also the sand of the North Court, leave Xijong. This thing has its uses in the sands, the pills, etc. The family takes its effects of decay, poison attack, and muscle growth. If the sands are at the beginning of the sands and have not yet been broken, use the amount of sands and apply them at the end of the study to make the sands dissipate. Such as the sands, the sands can help the sands, pull out the poison, and promote the early sands. And the sands can also be used to make the eyes obscure, so as to remove the sands.
However, it is poisonous, so be careful when using it. There are strict requirements for the amount used and the method of processing. If the processing is not appropriate, or the amount used is high, it is easy to cause poisoning. Those in ancient times were well aware of its nature, so when using it, it was easy to reduce the disease. Balance the pros and cons, and seek to eliminate the disease, while reducing the side effects of poison. The Dan family also uses long sand. Because of its chemical properties, it can play a special role in the production of Dan, and help Dan to become. In addition, the long sand is toxic, but in the field of medicine and medicine, it is reasonable to use, and it has its own value that cannot be ignored.

There are many ways to synthesize silicon tetrachloride. One is the gas-phase reaction of ferrosilicon and hydrogen chloride. Take ferrosilicon and place it in a special reaction vessel, through hydrogen chloride gas, under high temperature environment, silicon in ferrosilicon reacts with hydrogen chloride. The chemical formula is: $Si + 4HCl\ stackrel {high temperature }{=\!=\!=} SiCl_ {4} + 2H_ {2} $. This reaction requires precise temperature control. If the temperature is too high or too low, the reaction rate and product purity can be affected. If the temperature is too high, side reactions occur frequently, resulting in increased impurities in the product; if the temperature is too low, the reaction is slow and the yield is low.
The second is the direct combination of silicon powder and chlorine gas. The high-purity silicon powder is distributed in the reaction bed, and chlorine gas is introduced, and the two react violently to form silicon tetrachloride. The chemical reaction equation is: $Si + 2Cl_ {2}\ stackrel {high temperature }{=\!=\!=} SiCl_ {4} $. In this process, the particle size of silicon powder and the flow rate of chlorine are both key factors. If the particle size of silicon powder is fine, the reaction contact area is large and the reaction is more sufficient; the chlorine flow rate needs to be stable and moderate. If the flow rate is too large, the reaction is too violent and difficult to control; if the flow rate is too small, the reaction is incomplete.
The third is prepared by the disproportionation reaction of trichlorosilane. Under the action of a specific catalyst, trichlorosilane undergoes a disproportionation reaction to form silicon tetrachloride The reaction formula is: $3SiHCl_ {3}\ stackrel {catalyst }{=\!=\!=} SiCl_ {4} + Si + 2HCl $. This method requires high catalysts, and the activity and selectivity of the catalyst are directly related to the reaction efficiency and product ratio. Excellent catalysts can increase the yield of silicon tetrachloride, reduce energy consumption and cost.
Furthermore, silicon tetrachloride can also be obtained as a by-product of metal smelting in the metallurgical industry. If some metal ores contain silicon impurities, silicon combines with chlorine gas during smelting to form silicon tetrachloride. However, the product obtained by this route has many impurities and needs to be finely purified to reach the specific application standard.

The Four Qi Zhengyi Gui is a spiritual object of heaven and earth. Its physical properties are very different, and it contains the pure and upright Qi, which shows its unique quality in all kinds of wonderful uses.
This gui is hard in texture, and although it has been eroded by time and wind and rain, it is difficult to damage it at all. Its color is radiant, like the moonlight pouring out, soft but not bright, and it makes the heart quiet when viewed. It is warm to touch, warm and permeable, just like connecting with the human mind, and can soothe the restless thoughts.
The Four Qi Zhengyi Gui has the ability to absorb and condense the spiritual energy of heaven and earth. In a quiet place, its shimmering light can be seen, like a star glow looming, which is the image of absorbing spiritual energy. And the spiritual energy gathered is pure and mellow, which can nourish the things around it, make the grass and trees lush and full of vitality.
Furthermore, the four Qi Zhengyi and one Gui have the effect of warding off evil spirits and expelling filth. Evil and filthy things will retreat when they encounter them. Its righteousness is cold, like an invisible barrier, protecting one party's peace. Among the many efficacious things in the past, whenever the four Qi Zhengyi and one Gui were placed in the house, ghosts, demons and evil did not dare to approach, and the peaceful atmosphere in the home gradually became stronger, and the family was well-being.
In addition, the four Qi Zhengyi and one Gui are in cultivation together, which is also of great help. If cultivators can understand with their hearts, they can use the pure Qi breath in the Gui to help them reconcile the yin and yang in the body, dredge the meridians, speed up the cultivation process, and improve their own cultivation realm. Many high-level virtues have used this guide to make major breakthroughs in their cultivation.

Potassium tetraborate is a type of borate. Its chemical properties are unique and valuable for investigation.
Potassium tetraborate is soluble in water and can undergo hydrolysis reactions in aqueous solutions. The hydrolysis process is quite complex, causing the solution to exhibit a certain acidity and alkalinity. Due to the existence of various valence states and forms of boron under different conditions, this hydrolysis reaction is affected by many factors, such as temperature, solution concentration, etc. When the temperature increases, the degree of hydrolysis may change; when the concentration changes, the hydrolysis equilibrium will also shift.
Potassium tetraborate has certain oxidation properties. In some specific chemical reaction systems, it can act as a weak oxidant and participate in redox reactions. However, compared with common strong oxidants, its oxidation is not outstanding, and it only reacts with specific substances in specific situations to promote the reaction process and achieve material transformation.
In addition, potassium tetraborate can react with some metal ions. Boron has a special atomic structure and can provide empty orbitals. Some metal ions contain lone pairs of electrons, and the two can form stable complexes. This complexation reaction is widely used in the field of analytical chemistry. It can be used to separate and identify metal ions. It also helps to improve the selectivity and efficiency of certain chemical reactions.
Under heating conditions, potassium tetraborate decomposes. The decomposition products are closely related to the specific reaction conditions. Different temperatures, atmospheres and other conditions will cause differences in the decomposition products. This thermal decomposition property is of great significance in material preparation, chemical production, etc., and can provide raw materials or intermediate products for related processes.
In short, potassium tetraborate has rich and diverse chemical properties and has important applications and research value in many fields.

In today's market, the price of four positive and one basic silver often changes with time, and it is difficult to be sure. However, it can be briefly described.
Looking at the general market conditions, the price of four positive and one basic silver in the market varies depending on the texture, craftsmanship, shape and supply and demand of the market. If it is of ordinary shape, good texture, and no complicated craftsmanship, the price is about tens to hundreds of dollars per two. If it is exquisite in craftsmanship, or has a special shape and is good for collectors, the price can be doubled, or to hundreds of dollars per tael.
And if the texture is excellent, it is pure four positive and one basic silver, and it is ingenious in craftsmanship, integrates rare techniques in the world, or has special intentions such as inscriptions, the price is more expensive, or it can reach a thousand dollars or two, or even higher. This is all determined by the needs of the city and the characteristics of silver itself.
The city's people change, and the price is also impermanent. Merchants and traders belong to the city. They often observe the supply and demand of the city and the changes in current affairs to balance the price of four positive and one basic silver. If it is lucky, the market's demand will increase greatly, that is, the price of ordinary silver can also rise; if the market supplies too much, even if it is a good product, the price may drop. Therefore, if you want to know the exact price, you need to constantly observe the dynamics of the market and carefully observe the changes in the market before you can obtain it.