Pyridine, 3-bromo-4-chloro-

Mercury, commonly known as mercury, is a liquid metal, a flowing liquid with a silvery luster at room temperature. Its physical properties are unique and quite strange.
First of all, its melting point is extremely low, about -38.87 ° C. This characteristic keeps mercury in a liquid state at room temperature, unlike many metals. And the boiling point of mercury is not high, about 356.6 ° C. It is easy to vaporize when heated, and turns into mercury vapor to disperse in the air.
In addition, mercury has good electrical conductivity. Although its electrical conductivity is slightly inferior to that of gold, silver and copper, it is also a good conductor among many materials and can be used in specific electrical equipment.
Mercury has a very high density, about 13.59 g/cm3, much higher than water and most common liquids. Due to its high density, mercury sinks in water and can carry heavier objects on its surface.
Mercury has a high surface tension, which makes it form spherical droplets on a flat surface, like round silver beads, rolling freely.
Mercury has excellent fluidity. Because it is liquid and has little internal friction, it can flow easily and change its own shape according to the shape of the container.
In addition, mercury is volatile to a certain extent. Under normal temperature, mercury will slowly evaporate into mercury vapor. Mercury vapor is colorless and odorless, but toxic. Long-term exposure to mercury vapor can cause serious damage to human health.
The physical properties of mercury are unique and diverse, showing not only the commonalities of metals, such as electrical conductivity, but also its own characteristics, such as low melting point and high volatility. These properties have important applications and research value in ancient alchemy and many modern industrial and scientific research fields.

Mercury, commonly known as mercury, has unique chemical properties. Mercury is liquid at room temperature and is the only liquid metal. It is volatile and forms mercury vapor.
Mercury has relatively stable chemical properties. It does not react with oxygen at room temperature, but when heated, it can combine with oxygen to form mercury oxide. "Tiangong Kaiwu" has a saying: "Where mercury is used again, it is called silver vermilion (that is, mercury sulfide). For every catty of mercury, two catties of stone pavilion fat (that is, sulfur) will enter the stone pavilion. If there is no star in the same research, the green sand head will be hyped, and then it will be refined in the tank." This is the reaction of mercury and sulfur. Mercury and sulfur elemental grinding can combine to form mercury sulfide. This reaction is often used to deal with spilled mercury to prevent mercury volatilization from causing harm.
Mercury can also form amalgams with a variety of metals, such as sodium amalgam with sodium and gold amalgam with gold. The formation of gold amalgam is often used in ancient gilding processes, that is, gold amalgam is applied to the surface of utensils, and the mercury is evaporated by heating, and the gold is left on the utensils to achieve a gilding effect.
Although mercury is chemically stable, it can dissolve many metals, such as gold and silver. This property has unique applications in metallurgy and chemical industries. However, special attention should be paid to the fact that most of mercury and its compounds are toxic. When using it, it is necessary to be careful to avoid contact and inhalation of mercury vapor to prevent serious damage to the human body.

"Tiangong Kaiwu" says: "All lime is refined by fire. After it is formed, it will not be damaged forever when it enters the water. Hundreds of millions of boats, hundreds of millions of walls, choking gaps to prevent prostitution, it is a must." Lime is widely used in construction, boats and other fields, and its main uses are as follows:
First, it is used in the construction field. When building walls, lime plays a crucial role. Mixing lime with other materials can be used as a adhesive to make bricks and stones closely connected, which greatly enhances the stability of walls. Whether it is ordinary houses or grand palaces and pavilions, lime is indispensable. It allows the wall to withstand years of wind and rain erosion without easily collapsing, just as the text says "hundreds of millions of walls, choking gaps to prevent lewdness, is a must", which is enough to demonstrate its importance in building walls.
Second, it is used in the construction of boats. Vessels are in water for a long time and are vulnerable to water erosion. Lime can be used to fill the gaps between the ship plates, play a waterproof role, ensure that the boat will not leak when sailing in the water, so that hundreds of millions of boats can travel stably on rivers, lakes and seas to ensure the safety of navigation, which is the so-called "hundreds of millions of boats... is a must".
Third, lime is often used to prevent moisture. Because it has a certain degree of water absorption, it can be placed in some moisture-prone places or around items to absorb water vapor in the air and prevent items from being damp and deteriorating. In short, although lime may seem ordinary, it has key uses in many fields and has a profound impact on people's production and life.

The synthesis of 3 + -mercury-4-cyanogen is not easy, and it involves a lot of ingenuity and skills.
Mercury is a liquid metal at room temperature, which has unique properties. If you want to combine it with other things to obtain the desired thing, you should understand its properties in advance. Mercury has certain activity, but it also has its own special characteristics. It can often play a unique role in chemical reactions.
Hydrocyanogen, a highly toxic gas, has special chemical properties. The synthesis path has the following common methods.
First, using methane and ammonia as raw materials, under the action of appropriate temperature and catalyst, hydrogen cyanide can be formed. This reaction requires precise control of temperature and pressure, and the ratio of methane to ammonia is also crucial. As "Tiangong Kaiwu" says, in all things created, the scale is all about success or failure. If the temperature is too high, the product is easy to decompose; if the temperature is too low, the reaction will be slow and the yield will be low.
Second, using carbon monoxide and ammonia as the starting materials, hydrogen cyanide can also be synthesized under specific catalytic conditions. In this process, the choice of catalyst is particularly critical, and different catalysts can make the reaction rate and yield very different. Like a craftsman's selector, those who choose well get twice the result with half the effort.
As for the combination of mercury with other substances, for a specific purpose, the ability of mercury to form alloys with various metals can be used. For example, by mixing mercury with certain metals at appropriate temperatures, special amalgams can be obtained. This amalgam may play a unique role in subsequent reactions, or it can be used as an intermediate to further react with cyanide-containing substances in order to achieve the goal of synthesizing 3 + -mercury-4-hydrogen cyanide. However, this process needs to be handled with caution, because mercury is toxic and can be harmful if it is not careful.
The process of synthesis is a delicate project, requiring a precise grasp of the properties and reaction conditions of various substances in order to gradually achieve the goal and obtain the required materials.

Mercury is highly toxic, and oil and gas are also critical. When storing and transporting mercury, many matters should be handled with caution.
Mercury is highly toxic and volatile at room temperature. Its vapor is extremely toxic, and it is harmful to the human nervous system, kidneys, etc. When storing, use well-sealed containers. The material should be resistant to mercury corrosion, such as special glass bottles or metal cans, and should be placed in a cool, dry and ventilated place, away from fire and heat sources, to prevent mercury volatilization from intensifying. When handling, be sure to move gently to prevent mercury leakage due to damage to the container. If it is unfortunate to leak, evacuate the crowd quickly, strengthen ventilation, and cover it with sulfur powder to synthesize it into mercury sulfide to reduce its toxicity.
Oil and gas, flammable, explosive and volatile. Where it is stored, fire and explosion protection is the most important. Oil tanks and other facilities should be well grounded to eliminate static electricity hazards, and fireworks are strictly prohibited around, and complete fire protection facilities should be equipped. When transporting, the vehicle should be selected as a special oil tanker, the tank body is firmly sealed, and the transportation route should be planned to avoid densely populated areas and traffic arteries. During driving, drivers should strictly abide by traffic rules and safety regulations, regularly check the condition of the vehicle to ensure that there is no risk of oil and gas leakage.
Furthermore, whether it is mercury or oil and gas, the storage and transportation places should be equipped with obvious warning signs to warn everyone. Relevant practitioners must undergo professional training and be familiar with operating norms and emergency response methods in order to ensure the safety of storage and transportation and avoid disasters.