1% 2C3 (suspected to be a clerical error, speculated to be "one or two"), two, five, Ran, two, and mustard, each of which has its own use.
First say "two", which is often used in conjunction with "one qi", but here the single word "two" is used in traditional use, often used to represent night water vapor. In ancient times, some alchemists thought that this night qi could be harvested and refined, saying that it could benefit the body and health, and scholars and writers often used "
" into poems, like the clear and moist night scenery, adding the elegance of poetry.
One of the "five" numbers is of key use in many fields. In the theory of the five elements, the "five" of gold, wood, water, fire, and earth form the basis for the change of all things, and are related to numerology, feng shui, and traditional Chinese medicine. Traditional Chinese medicine uses the five elements to correspond to the five internal organs, and judges diseases and prescribes medicines according to the principle of the five elements to generate grams; numerology feng shui also uses the balance and circulation of the five elements to discuss the rise and fall of good luck and bad luck, and the house. In the regulation of etiquette, the five rituals are divided into good luck, evil, army, guest, and jia, which determine the order of interpersonal communication and social operation.
"Ran", as the saying goes, "gang", also has the state of "gang", which shows that the water surface is vast and the fog is filled. In the eyes of the ancients, it was a corner of the natural weather, and in the Taoist concept, the water vapor represented by "Ran" was also connected to the vitality of heaven and earth. Cultivators seek to sympathize with the vitality, or involve the clear qi contained in "Ran".
As for "mustard", "mustard" is originally a small grass and is connected to "
". Although there is no common fixed combination usage, "mustard" was often used as a symbol of micro-things in ancient times, or in the writings of literati, it expressed the sense of insignificance and impermanent fate; or in pharmacology, some mustard plants can be used as medicine and have their unique curative effects.
To sum up, all the things involved, whether related to natural weather, human health, or to etiquette and literary images, all have their own place and use in the context of ancient culture.

1% 2C3 is copper. Copper has all kinds of physical properties. Its color is golden and bright, which is a remarkable characteristic of its appearance. The texture is soft, but it also has considerable toughness, so it can be easily extended into silk, or hammered into thin sheets, which is convenient for processing in various processes.
Copper has excellent electrical conductivity and ranks among the best in all kinds of metals. Therefore, in many fields such as electrical equipment, wires and cables, copper is an indispensable material. Its thermal conductivity is also very good, just like the good use of heat, which can quickly transfer heat. In the manufacture of cookware and other aspects, this characteristic is very useful, making cookware heated evenly and cooking more convenient.
Furthermore, the melting point of copper is about 1083.4 ° C, and the boiling point is 2567 ° C. This melting point makes copper easy to melt and cast in industrial activities such as metallurgy, and can be molded into various utensils according to human needs.
As for 5 mercury, it is the only metal that is liquid at room temperature and pressure. The color is silver-white, the flow is like water, and the appearance is unique. Mercury has a high density and feels heavy. And its vapor pressure is very low, it is volatile, and the volatile gaseous mercury is toxic, so it needs to be used with extreme caution.
Mercury has good electrical conductivity. Although it is inferior to metals such as copper, it is also useful in certain electrical devices. Its thermal conductivity is slightly inferior to most metals.
and 2 lead are soft and can be scratched by nails. Its color is gray and its appearance is rustic. The density of lead is extremely high, and it is abnormally heavy. The melting point is relatively low, only 327.5 ° C, and it is easy to heat and melt.
Lead has poor electrical conductivity, far inferior to copper. However, its corrosion resistance is quite strong. In the chemical industry and other fields, lead containers are often used to store corrosive substances such as acids and alkalis. Lead has good ductility and can be processed into lead plates, lead pipes and other products, which are used in construction, protection and many other aspects.
Copper, mercury and lead, each because of their unique physical properties, have developed their strengths in various fields such as industry and life in the long river of history, contributing to the evolution of human civilization.

The physical properties of 1% 2C3 + - + dimethyl + - + 5 + - + alkane + - + 2 + - + chloroethylbenzene are as follows:
1% 2C3-dimethyl, which has chemical compounds. Dimethyl compounds often have specific chemical activities, and the presence of methyl groups in the molecule makes their chemical phases active. Under normal conditions, they may be liquid or solid, depending on their properties and substituents. Its melting boiling is affected by molecular forces, such as nuclear substitution, nuclear substitution, etc., because the solitary particles on the atom can be used as the reaction active center.
5-alkane, alkane compounds have a common chemical phase. Due to the solidification of carbon in alkane molecules, it is generally not reactive under normal conditions, such as acid, oxidation, and so on. 5-Alkane has a certain resistance, and the melting of carbon increases and increases. Usually flammable substances that are colored and smelly, the density is generally less than that of water, which is soluble in water, but easily soluble in soluble water.
2-chloroethylbenzene, benzene and chloroethyl phase, so that the mixture has the characteristics of both benzene series and benzene generation. Due to the effect of chlorine atoms, the density of benzene clouds changes, so that its reaction activity on aromatic benzene is different. Its physical reason, often under a lot of liquid, has a special taste, phase density is higher than water, slightly soluble in water, soluble in more soluble. In the chemical reaction, chlorine atoms can be replaced by chlorine atoms, and benzene atoms can be replaced by benzene.
, each of these three has its own physical properties and chemical properties. In the chemical synthesis, engineering and other fields, they have different uses and methods due to their respective characteristics.

To prepare 1,3-dibromo-5-chloro-2-fluorobenzene, it can be synthesized according to the following ancient method.
First, benzene is used as the starting material. The chlorination reaction of benzene is carried out first. Under suitable reaction conditions, chlorine gas is used as the chlorine source and ferric chloride is used as the catalyst. The electrophilic substitution reaction of benzene can be carried out to introduce chlorine atoms to form chlorobenzene. The key to this reaction is to control the reaction temperature and the amount of chlorine gas introduced to prevent excessive chlorination.
Then, the bromination reaction of chlorobenzene is carried out. Using liquid bromine as the bromine source, bromine atoms can be introduced into the benzene ring of chlorobenzene under the catalysis of iron powder or fer Due to the fact that chlorine is an ortho-para-localization group, a mixture of o-bromochlorobenzene and p-bromochlorobenzene can be obtained in this step. However, the difference in physical properties between the two, such as different boiling points, can be obtained by distillation and other separation methods to obtain pure p-bromochlorobenzene.
Then, p-bromochlorobenzene is nitrified. The mixed acid of concentrated nitric acid and concentrated sulfuric acid is used as a nitrifying agent, and the p-bromochlorobenzene ring is reintroduced at a suitable temperature. This step requires strict control of the reaction temperature to prevent the formation of polynitro compounds.
Next, the resulting nitro-containing product is reduced. A suitable reducing agent, such as iron and hydrochloric acid system, can be used to reduce the nitro group to an amino group to obtain p-bro After
, p-bromochloroaniline is treated with sodium nitrite and hydrochloric acid at low temperature (usually 0-5 ° C) to convert it into diazonium.
Finally, the diazonium salt is reacted with fluoroborate acid to form fluoroborate, which is then decomposed by heating to obtain 1,3-dibromo-5-chloro-2-fluorobenzene. This series of reaction steps is complicated, and each step requires careful control of the reaction conditions to achieve higher yield and purity.

1% 2C3, Ercao, Wuzhihalogen, Erzhize crab, when storing and transporting, pay attention to many matters.
When storing, the first choice of environment. It should be dry and well ventilated. If the humidity is too high, Ercao is perishable, halogen is easy to deteriorate, and it is difficult for Ze crab to survive. And the temperature also needs to be suitable. If it is overheated, Ze crab is easy to die, and halogen is easy to deteriorate; if it is too cold, 1% 2C3 may be frozen. In addition, the storage place should be clean and free of dirt, so as not to stain it and cause quality damage.
When transporting, there are also many considerations. The transportation equipment needs to be kept clean, and it should be carefully cleaned before shipment to prevent sundries and odors from mixing in. The transportation of Ze crab should be properly placed, and it can be padded with wet grass and other materials to keep it moist and prevent it from dying of thirst. For the transportation of Ercao and halogen, the container must be well sealed to prevent leakage. If the halogen leaks out, it will not only damage itself, but also stain and other things. The driving on the way should also be steady to avoid its bumps and vibrations, which will cause the Ze crab to be injured, the Ercao broken, and the halogen liquid to pour.
The transportation time is also the key. A suitable route should be planned, and a fast way should be selected to reduce the time-consuming, so that the Ze crab can be delivered fresh, and the quality of the Ercao and halogen should If it takes too long, the vitality of the Ze crab gradually loses, and the quality of the Ercao and halogen also gradually decreases.
All of these are essential for the storage and transportation of 1% 2C3, Ercao, Wuzhe halogen, and Erzhe crabs. A slight loss will cause quality damage and cannot be careless.