1 3 Dibromo 2 Iodobenzene

As recorded in "Tiangong Kaiwu", there are two main uses of arsenic. First, it is used for agricultural pest control. Arsenic is very toxic, and in the fields, it can eliminate pests and ants and other pests. In the past, farmers were well aware of the ferocity of pests, which often destroyed the fields and crops, causing food to fail and making it difficult for the people to eat. Arsenic is sprinkled in the fields, and insects and ants kill it when they touch it, keeping the fields and crops growing, so that farmers can gain hope. Second, it is used in medicine to treat diseases. Although arsenic is highly toxic, it can also be used as medicine after being processed by good doctors. For some diseases, such as sores and severe diseases, a small amount of arsenic can be used as medicine to attack poison and disperse knots and treat people's diseases. The ancient healers, who studied pharmacology carefully, knew the advantages and disadvantages of arsenic, and used it properly, they would save people from diseases and pains; if used improperly, they would Therefore, in the use of medicine, we must be cautious and precise in the dosage, in order to achieve the effect of treating patients and saving people. Arsenic's two uses, one is related to the food and clothing of people's livelihood, and the other is related to the well-being of the people, which is of great significance in ancient society.

"Tiangong Kaiwu" says: "Alum is in the shape of hardware color, and sulfur is the general of a group of stones, all of which are changed by fire." Alum and sulfur are used in alchemy and metallurgy. The two have something in common with the physical properties of alum and nitrate in the question. Let me tell you one by one.
Alum and nitrate are chemical substances, and their properties are changeable and have a wide range of uses. Looking at their physical properties, the first is their form. Alum and nitrate are in the shape of crystals, crystal clear, just like natural gemstones. Its shape is regular, either prismatic or block-like, and its luster is introverted. The beauty of this form comes from the orderly arrangement of its internal molecules, which is the work of natural creation.
Second, on its solubility. Alum nitrate dissolves in water, which is quite wonderful. In contact with water, it melts, quietly, into the water body, just like ice into a warm spring, without trace. This characteristic makes it in many chemical experiments and industrial production, can be used as a solution to participate in the reaction, can be evenly dispersed in the system, and promote the reaction, which is one of its major functions.
Furthermore, alum nitrate has water absorption. Placed in the air, as if a thirsty person seeks water, it will absorb the surrounding water vapor, and its own shape or gradual change, or turn into a moist state. This property is widely used in moisture-proof, drying, etc. In storage, a small amount of alum nitrate can keep the goods dry and free from rust and mildew caused by water vapor erosion.
Thermal stability is also an important physical property of alum nitrate. When heated, alum nitrate may decompose or sublimate, depending on its type. This change process is often accompanied by changes in color and shape, just like a magical magic show. Either from white to yellow, or from solid to gas, this heat change property is of great significance in the fields of chemical industry, metallurgy, etc. It can use the power of heat to make it react in a specific way to extract the required substances.
The oxidizing and reducing properties of alum nitrate should not be underestimated. Under specific conditions, alum nitrate can be used as an oxidizing agent to take away electrons from other substances and promote oxidation; it can also be a reducing agent to sacrifice electrons and undergo reduction reactions on its own. This property is a key element in many chemical reactions, which can affect the direction and process of the reaction and help the synthesis and transformation of substances.
The physical properties, morphology, solubility, water absorption, thermal stability, oxidation and reduction properties of alum nitrate are of great value in life, production and scientific research. It is a treasure bestowed by nature to mankind. It will be continuously explored by future generations to make the best use of it.

Titanium diboride is a very unique inorganic compound. It has many excellent chemical properties and is worthy of further investigation.
In terms of its chemical stability, titanium diboride is quite excellent. Under normal temperature conditions, it can resist the attack of many chemicals and is not easy to react with common acids and bases. This property makes titanium diboride stable in many harsh chemical environments, and can be used in scenes that need to resist chemical corrosion, such as the lining of chemical equipment.
Titanium diboride also has good oxidation resistance. Even in high temperature environments, it can resist the oxidation of oxygen to a certain extent. When the temperature does not reach a certain threshold, only a layer of oxide film will slowly form on the surface. This oxide film can further prevent the inward diffusion of oxygen, thus protecting the internal material from excessive oxidation. This property makes it advantageous in high temperature applications, such as components of high temperature furnaces.
Furthermore, the conductivity of titanium diboride cannot be ignored. It has metal-like electrical conductivity, in which electrons can move more smoothly. This property makes it useful in the field of electronics. It can be used as an electrode material, etc., to help the electron conduction process proceed efficiently.
In addition, titanium diboride reacts with certain active metals under certain conditions. For example, with alkali metals at high temperatures and in the presence of appropriate catalysts, displacement reactions can occur, etc., to generate new compounds. This reaction property provides more possibilities and expansion space in the field of material synthesis. In short, the rich chemical properties of titanium diboride make it show unique value and application prospects in many fields.

The things transformed by the two insects (snakes) are called cobras in the world, and there is a saying that "cobras turn into dragons for five hundred years, and dragons turn into dragons for a thousand years". However, the method of making cobras is contained in ancient books, which is quite complicated, and each method is different. Today, I record the number of methods to treat all lords.
One of them is cited by realgar. Realgar is strong in nature, and has the ability to ward off evil spirits and drive away poison. "Baopuzi" said: "In the land of snakes, realgar, garlic and other things can be avoided." If you want to make a cobras, you can sprinkle realgar powder all over the place where it haunts. When you touch it, your body is like a fire, and it is difficult to get close. And realgar smells pungent, It can also be refined with realgar and various medicines to make medicinal pills, which can be worn by the side of the body, and the cobra does not dare to invade.
Second, take peach wood as a tool. Peach wood is known as the name of warding off evil spirits. The "Classic Technique" says: "Peach is the essence of five trees, so it is also the one who suppresses evil energy." Cut peach wood to make swords, cards, etc. Place it around the dwelling place, and when you see it, you are afraid and dare not approach it. If you point to a cobra with a peach wood sword, you will run away in a hurry. Ancient alchemists used this method to exorcise evil spirits.
Third, raise spirit birds to make them. Spirit birds, such as cranes and eagles. The crane, by nature, is noble and pure, and its voice is clear and clear, and it is terrified when it hears it. "The Crane Sutra" says: "Crane, the yang bird, also swims in the shade, and it must follow the chestnut, and stop gathering forest trees." Cranes forage in wetlands, and asps live there all the time. When cranes see asps, they must peck them with their long beaks. Eagles, fierce and good at catching, have sharp eyes, and can see things in the sky. The asps walk among the grass, and when the eagle sees them, they rush down and catch the asps with their sharp claws. Therefore, when raising spirit birds in the courtyard, the asps dare not come.
Fourth, the method of spells. Taoism has many incantations to drive away the cobra, using cinnabar script symbols on yellow paper, and the runes are like tadpoles, or seal
. Holding the incantation, the incantation says: "The sky is clear and the earth is peaceful, and the evil should not go, and it is urgent as ordered!" Stick the incantation on the lintel, window lattice, or wear it with you to protect the evil from invading. The power of the incantation comes from the spiritual energy of heaven and earth and the power of thought, and sincerity is the spirit.
These dharmas are all dharmas made by the ancients. Although the times have changed, the wisdom in them can also be learned by future generations.

When storing and transporting a sword, pay attention to many matters.
The materials for casting a sword need to be refined. Good iron is the foundation, and impurities must be removed to obtain a tough sword body. When storing, it is advisable to choose a dry place to avoid water and moisture to prevent rust. If the sword body is eroded by water vapor, it will rust for a long time and damage its sharpness. And the hiding place should be quiet, so as not to let foreign objects collide and cause the edge to crack.
When transporting, the packaging should be proper. Wrap it in a thick cloth or soft leather to slow its vibration and avoid bumping on the way. The blade is sharp, and if you are not careful, it will hurt people's lives and damage the sword body. Escort people, be careful, don't be impatient.
Swordsmiths need to be in awe, and every step is about the quality of the sword. Storage and operation seem to be the end, but in fact it is crucial. If the storage is not good, there is no way to use it, and even if there is a good sword, it is difficult to achieve its beauty. Only by cherishing the whole process of swordsmithing, and paying attention to the details of storage and operation, can the sword be intact and sharp when ready for use.