1 3 Dichloro 5 Iodobenzen

1% 2C3 is sulfur and saltpeter, both of which were often used in alchemy in ancient times, and are also important raw materials for making gunpowder. Sulfur heat, which has the functions of killing insects and relieving itching, is often used in alchemy; saltpeter is cold, and also plays a key role in the process of alchemy.
"Erwu" usually refers to Chuanwu and Caowu, both of which are Chinese herbal medicines. They have the functions of removing wind and dehumidification, warming meridians and relieving pain. However, they are quite toxic, and they need to be carefully processed and strictly controlled when used. In ancient times, they were often used in pharmaceuticals to treat diseases, and they can be seen in some prescriptions, which can treat wind, cold, dampness, joint pain and other diseases.
In the traditional context, the "five poisons" generally refer to centipedes, poisonous snakes, scorpions, geckos and toads. During the Dragon Boat Festival, there is a folk custom of repelling the five poisons. It is believed that the five poisons are active at this time, which will bring disasters and diseases to people. People use the five poisons by posting pictures of the five poisons and wearing sachets to achieve the purpose of repelling evil spirits and avoiding harm. At the same time, some of the poisons in the five poisons can also be used as medicine after special treatment. They have unique uses in the field of traditional Chinese medicine, such as scorpions, centipedes, etc., which have the functions of preventing wind and suppressing spasms, clearing collaterals and relieving pain.
"Tiangong Kaiwu" once said: "Where gunpowder, sulfur is pure yang, and nitrate is pure yin", which accurately expounds the characteristics However, after long-term practice and exploration in the application of traditional Chinese medicine, Erwu and Wujiu have formed a complete system of preparation, compatibility and application, which not only reflects the ancient people's in-depth understanding of the medicinal value of natural things, but also reflects the breadth and depth of traditional medicine culture, which is of great significance in many aspects such as human medical treatment and cultural life.

Arsenic, or arsenic trioxide, is highly toxic, according to Tiangong Kaiwu. Its physical properties are as follows:
It is white in color and like frost and snow, so it is named arsenic. The quality is delicate, and the powder form is mostly. It is solid at room temperature, feels delicate to the touch, and looks like a fine powder in the hand. Arsenic has a relatively high density, and it feels sinking when held. The melting point is about 320 degrees Celsius, and it is easily melted into a liquid state when heated. If it is continuously heated to about 457 degrees Celsius, it will sublimate and directly change from solid to gaseous state.
Arsenic is highly toxic, but it also has certain medicinal value. According to ancient medical records, after special processing, it can be used as medicine to treat certain diseases. However, the dosage needs to be precisely controlled. If you are not careful, it will cause poisoning or even death. In the industrial field, arsenic can also be used to make pesticides, herbicides, etc., to control crop diseases and pests. However, due to its strong toxicity, extreme caution must be used to prevent serious harm to the environment and human body.
Because of its highly toxic nature, arsenic must be properly kept and used in daily life and industrial production, and must not be touched at will to avoid poisoning accidents and endanger life and safety.

1% 2C3, that is, nitrous oxide and sodium azide, both of which are chemical substances. Nitrous oxide, commonly known as laughing gas, is a colorless and slightly sweet gas at room temperature and pressure. It has a slight anesthetic effect and can cause people to laugh. Sodium azide is a white hexagonal crystal that decomposes nitrogen when heated to 300 ° C.
As for whether the chemical properties of the two are stable, it is difficult to generalize. Nitrous oxide is relatively stable and does not react with common substances under normal conditions, but there is still a risk of violent reactions when exposed to high temperatures, open flames or strong oxidants. For example, when mixed with oxygen, it may cause combustion or even explosion when exposed to an open flame. Sodium azide has poor stability. When it is heated, hit or in contact with acids, it easily decomposes to produce highly toxic and flammable and explosive azide acid. At the same time, sodium azide itself is also highly toxic, and contact with skin or inhalation of dust may endanger life.
In summary, 1% 2C3, that is, nitrous oxide and sodium azide, is not absolutely stable in chemical properties. When using and storing, it is necessary to strictly follow safety regulations to prevent danger.

To prepare the complex of mono- and tri-dioxy-penta-naphthol, there are many methods, and the main ones can be selected, which are listed below.
First, organic synthesis can be used. With suitable organic raw materials, according to specific reaction steps, the desired molecular structure is gradually constructed. First, take compounds containing appropriate functional groups, such as active halogenated hydrocarbons or carbonyl compounds, and make them under specific reaction conditions, such as in alkali-catalyzed or acid-catalyzed environments, carry out nucleophilic substitution or condensation reactions. Through carefully designed reaction sequences and conditions, the molecules are gradually converted into the structure of mono- and tri-dioxy-penta-naphthol.
Second, it can be extracted from natural products or obtained by biotransformation. Many natural substances in the world, or contain related structural units. With modern separation and extraction technology, relevant components are enriched and isolated from specific plants, microorganisms and other natural resources, and then converted into target products by appropriate chemical modification or biotransformation means. For example, some plants or compounds with similar structures can be structurally modified by biological means such as enzyme catalysis to obtain one of the required ones, tri-dioxo-penta-naphthol.
Third, the method of catalytic reaction is used. The selection of high-efficiency catalysts can significantly change the rate and selectivity of the reaction. A specific metal catalyst or enzyme catalyst can be found to cause the reactants to react in a predetermined way under mild reaction conditions. Metal catalysts can activate the reactant molecules by virtue of their unique electronic structure and coordination ability, and guide the reaction in the direction of generating one, three-dioxy-five-naphthol. Enzyme catalysts are highly specific and efficient, and catalyze specific chemical reactions in a suitable biological environment to achieve the purpose of synthesis.
All these methods have advantages and disadvantages. When in practice, when considering the availability of raw materials, cost considerations, difficulty of reaction, and purity requirements of the product, etc., the ideal synthesis effect can be achieved through careful selection.

In the storage and transportation of mercury, many precautions need to be carefully remembered.
Mercury is a toxic liquid metal with volatile properties. When storing, choose the first heavy container. Use a strong and well-sealed container to prevent mercury leakage. If stored in an ordinary glass container, the container may be damaged due to the infiltration and corrosion of mercury on the glass, and the mercury liquid will flow out. Therefore, special metal containers or thick ceramic containers are often used, and the container mouth should be tightly closed.
In the storage environment, a cool and ventilated place should be selected, and the temperature should not be too high. Because the evaporation rate of mercury accelerates with the increase of temperature, the high temperature environment can easily cause a large amount of mercury to evaporate in the air, forming mercury vapor, which is very harmful. At the same time, the storage place should be kept away from fire and heat sources. Although the chemical properties of mercury are relatively stable, it may react with certain substances when heated and cause danger.
When transporting mercury, the packaging must be solid and reliable. Not only should the container be well sealed, but buffers and protective materials should also be added to the outer package to prevent damage to the container due to collision and vibration during transportation. Transportation vehicles also need to have good ventilation conditions. If mercury leaks, mercury vapor can be discharged in time to reduce harm. Transport personnel must be professionally trained and familiar with the characteristics of mercury and emergency treatment methods. If mercury leaks during transportation, do not panic, and evacuate the surrounding personnel immediately to avoid inhaling mercury vapor. At the same time, take prompt measures to collect the leaked mercury, which can be covered with sulfur powder, so that the mercury can react with it to form mercury sulfide, reduce toxicity, and then properly dispose of the waste.