Benzene 1 2 Difluoro 3 Iodo

1% 2C2 is nitrous oxide, commonly known as laughing gas. Its chemical properties are as follows:
Laughing gas is a colorless and slightly sweet gas at room temperature and pressure. It can support combustion and is an oxidant. It is stable at room temperature, has a slight anesthesia effect, and can cause people to laugh. It can be decomposed into nitrogen and oxygen under certain conditions, and the equation is\ (2N_ {2} O\ stackrel {certain conditions }{=\!=\!=} 2N_ {2} + O_ {2}\).
Laughing gas is slightly soluble in water, and its solubility in water is small. It is miscible with common organic solvents such as ethanol, ether, and concentrated sulfuric acid.
In some specific chemical reactions, laughing gas can participate in the reaction as a mild oxidant, such as reacting with some metal elementals under heating and other conditions to oxidize the metal to a certain valence state. However, compared with common strong oxidants such as potassium permanganate, its oxidation ability is relatively weak. Laughing gas can also be used in organic synthesis reactions to provide a certain oxidation environment for the reaction or participate in the construction of some special chemical bonds.
Laughing gas also has certain anesthetic properties. It was used as an anesthetic in the early days of medicine, but due to its limited anesthetic effect and possible adverse reactions, it is less used as a general anesthetic today, and more is used in combination with other anesthetic drugs to enhance the anesthetic effect and reduce side effects. However, it should be noted that the unauthorized abuse of laughing gas can cause serious harm to the human body, such as causing damage to the nervous system.

Among the many reactions involved in "Tiangong Kaiwu", arsenic can act as a reactant in the following reactions:
In metal smelting-related reactions, some arsenic-containing minerals will produce arsenic during the smelting process, and arsenic may also participate in subsequent reactions. For example, in the smelting process of some metals such as lead and silver, if the ore contains arsenic, the arsenic will evaporate in the form of arsenic after roasting and other steps, and then the arsenic may further react with other substances, such as reacting with alkaline substances to form arsenic-containing compounds, thereby affecting the purity of the metal and the composition of the smelting products.
In some reactions related to alchemy and drug production, arsenic is also useful. Ancient alchemists believed that arsenic had special properties and would add it to alchemy formulas, hoping to refine medicinal pills with magical effects through complex reactions. Although its cognition or there are deviations, from the perspective of chemical reactions, arsenic participates as a reactant in such processes. In terms of drug production, the ancients found that although arsenic is highly toxic, it can be specially processed and then injected into medicine. When preparing drugs containing arsenic, arsenic is the initial reactant, which needs to go through multiple processing processes to change its chemical form and toxicity to achieve medicinal purposes. In the experiments and explorations of specific chemical reactions, the ancients were curious about the reactions between substances. Arsenic, as a special chemical substance, was selected as a reactant to explore its reaction phenomena and products with other substances. Although the chemical knowledge at that time was limited and the experimental methods were simple, this spirit of exploration promoted the understanding of the chemical properties of arsenic.

"Tiangong Kaiwu" says: "Two stones, the genus of stones, are of different types." Alumite is one of the minerals, and it is unique and widely used.
The texture of alum is usually hard, mostly lumpy, and its colors are different, or white, or green, or yellow. Take alum as an example. The color is white and pure, the touch is delicate, and the knock is loud, and the sound is clearer. This is its physical manifestation.
The nature of alumite has the ability to converge. It dissolves in contact with water, and the solution is often clear, but it contains its unique properties. Calcined in fire, the shape and color are changed, or expanded, or discolored, which is its characteristic of heating.
Alumite has a wide range of uses. In daily life, it can be used as a water purifying agent. When alumite is applied to turbid water, after its quality is dissolved, it can make the filth in the water gather and settle, making the water gradually clear. This is due to its astringent and condensing properties. In the dyeing and weaving industry, alumite is also indispensable. The dye helps to adhere to the fabric, making the color firm and not fade for a long time. This is due to the interaction between alumite and dyes and fabrics. In the field of medicine, alumite also has a place. Its astringent and damp properties can be used for sores, swelling, or external application, or internal conditioning, depending on the disease and medical treatment.
All these show that alum stone has unique physical properties and a wide range of uses. It is a gift from nature and is used by people for the benefit of the world.

If you want to make a two-edged dagger and a three-edged dagger, there are many methods, and each has its own subtlety. The details are as follows:
First, choose the material to be the heaviest. If you want to cast a good dagger, you should choose fine iron, which is pure but not miscellaneous, in order to make the blade edge strong and difficult to roll. The good craftsman of ancient times often looked for deep mountain iron ore, and after tempering and purifying, you can obtain the material that can be used.
Second, the art of forging. Put the selected iron in a furnace fire and calcine it with a fierce fire until it is red. At this time, you need to grasp the heat. If the fire is too strong, the iron will be easy to melt, and if the fire is not enough, the quality will not be pure. When the iron is red, forge it with a sledgehammer When beating, the force must be uniform, and the direction should also be paid attention to, so that the texture of the dagger body can be uniform and there is no weakness.
Third, the blade is shaped. When the iron has been forged many times for good texture, it needs to be shaped according to the shape of one or two blades or three edges. If the two blades are made, the two sides need to be carefully polished to make the blade surface flat and smooth, and the blade line is straight. The thickness of the blade should also be considered. If it is too thick, it will be unfavorable for cutting, and if it is too thin, it will be easy to collapse. If the three-edged dagger is made, it is necessary to precisely create the shape of the three edges, so that the three edges are symmetrical and the angle is suitable, so that it is not only beautiful, but also more piercing.
Fourth, the method of Burn the dagger body red again and quickly immerse it in cold water or grease. When quenching, there are ways to choose between machine and liquid. Cold water quenching can make the blade hard and brittle; grease quenching can make the blade hard and soft. It is necessary to choose accurately according to the purpose and expected characteristics of the dagger.
Fifth, the power of grinding. After quenching, although the dagger is tangible, the edge is not sharp enough, so it needs to be carefully sharpened with a grinding stone. First use a rough grinding stone to remove burrs and irregularities, and then use a fine grinding stone to fine grind, so that the edge is as smooth as a mirror, and it is extremely sharp. When sharpening, the method should be stable, and the force should be uniform, so that the edge can be kept consistent sharpness.
All the above methods are the key to making a two-edged and three-edged dagger. Each step is interconnected, and it is difficult to form a good tool if there is a slight difference.

"Tiangong Kaiwu" says: The use of saltpeter is the most beneficial. Saltpeter is the main one, supplemented by sulfur and charcoal, which are combined into gunpowder, which is very useful in military and engineering. In the military, it can make artillery and rockets, which are amazing on the battlefield and can defeat the enemy. In engineering, it can be used to open mountains and roads, help fortifications, and save countless manpower.
Also, when refining alchemy, saltpeter is also a medicine. The ancients refined alchemy and wanted the art of longevity. Saltpeter participated in many chemical reactions in it. Although the wish of longevity was never fulfilled, the process of alchemy also promoted the understanding of chemical substances.
In the production of fireworks, saltpeter is also indispensable. With all kinds of pigments, it can bloom colorful fireworks, or like meteors catching the moon, or like blooming flowers, adding color to the festival and pleasing to the viewer.
In addition, saltpeter can be used as a flux in the metallurgical industry. It can reduce the melting point of ores, accelerate the separation of metals and impurities, improve smelting efficiency and metal purity, and assist in the manufacture of metal instruments.
As for the field of medicine, saltpeter also has its uses. It has the effect of clearing heat and reducing swelling, and can be used as medicine to treat certain diseases. Although it is not as widely used as other medicines, it is also a member of the medical treasure house.