Pyridine 3 Chloro 2 Iodo

Mercury is a metallic element with unique chemical properties. Mercury is a liquid at room temperature, which is one of its distinguishing characteristics. Compared with many metals, mercury has an extremely low melting point of -38.87 ° C and a boiling point of 356.6 ° C.
Mercury has good electrical conductivity and high chemical stability. Under normal conditions, mercury does not react easily with oxygen and is relatively stable in air. However, when heated, mercury can combine with oxygen to form mercury oxide.
Mercury can form alloys with a variety of metals, which are called amalgams. For example, mercury can form sodium amalgams with sodium and silver amalgams. Amalgams are widely used in metallurgy and dentistry.
There are many kinds of mercury compounds, and their chemical properties are also relatively rich. The common valences of mercury are + 1 and + 2. For example, mercury chloride (HgCl ²) is a highly toxic compound with strong oxidizing properties; while mercury chloride (HgCl ²), commonly known as calomel, has relatively stable chemical properties and has been used in the field of medicine.
It should be noted that mercury and most of its compounds are toxic and can cause serious harm to human health. Mercury can accumulate in organisms and pass through the food chain, which has a negative impact on the ecosystem. Therefore, when using and handling mercury and its compounds, strict protective measures must be taken to avoid damage to the environment and personal safety.

Mercury, its physical properties are very unique. Mercury is liquid at room temperature, like flowing silver, shining with the unique luster of metals, which is rare among metals.
Looking at its fluidity, it is extremely smooth, like beads walking on a jade plate, shaking gently, it flows freely and is difficult to bind. Its density is quite high, compared with common things, under the same volume, mercury is heavier.
Furthermore, the melting point of mercury is extremely low, only -38.87 ° C, which makes mercury melt into a liquid state in an environment slightly higher than this temperature. And its boiling point is not high, 356.6 ° C. When heated, it is easy to change from liquid to gas and rise.
Although mercury is a metal, it has little ductility and cannot be beaten into thin sheets or drawn into filaments like gold or silver. It has a special texture and cannot be forged like common metals.
In addition, mercury has good electrical conductivity and can play an important role in circuit conduction. When connected to a suitable circuit, current can smoothly pass through the mercury body, demonstrating its ability to conduct electricity.
Mercury vapor is highly toxic and diffuses in the air, silently but very harmful. If inhaled inadvertently, it is extremely harmful to human health, so when using it, you need to be extremely cautious and must not be negligent. These are all the physical properties of mercury. Only by understanding these can we know the characteristics of mercury and use the correct method to prevent it.

In the context of "Tiangong Kaiwu", the main uses of nitrate (here "nitrate" should refer to nitrate substances such as potassium nitrate) are quite extensive.
First, in the military field, nitrate is a key raw material for the manufacture of gunpowder. In the gunpowder formula, the proportion of nitrate is very important. It participates in the combustion reaction, releases a large amount of gas and heat, and gives gunpowder a strong explosive power. It makes firearms such as guns and artillery have the effect of killing and destroying, and plays a key role in war offense and defense and military deterrence.
Second, in the fireworks production industry, nitrate is also indispensable. The colorful and colorful effects presented when fireworks are released are greatly contributed by nitrate. It can promote the combustion reaction of gunpowder, control the combustion speed and intensity, and cooperate with different metal salts to produce different flame colors, creating a beautiful visual feast and adding a joyous atmosphere to festivals, celebrations and other occasions.
Third, nitrate is also used in the metallurgical industry. In some metal smelting processes, nitrate can be used as a flux. It can reduce the melting point of ore, make the metal oxides in the ore easier to be reduced, improve smelting efficiency, help separate higher purity metals, which is of great significance to the refining and purification of metals, and promote the development of the metal processing industry.
Fourth, nitrate was also used in the field of medicine in ancient times. According to some medical books, after proper processing, nitrate can be used as medicine to treat diseases. It has the functions of diarrhea, softening and firming, and has a certain therapeutic effect on some diseases such as gastrointestinal stagnation and dry fecal node, providing an effective drug choice for ancient medical practice.

Mercury is one of the hardware, and its nature is yin, and it is good to flow away. The ancients had many methods for the combination of two mercury.
One method is based on cinnabar. For cinnabar, Dan sand is also red in color and contains mercury. Take pure cinnabar first, grind it into a very fine powder, and place it in a crucible. Slow burn it over a warm fire, and wait for its color to change, and the vapor of mercury rises, and it is received by a condensing device to obtain mercury. This mercury is then combined with an appropriate amount of other medicines, such as lead pill. For lead pill, red lead is also, take it and study it together with mercury, put it in a closed device, and calcine it with a slow fire. Be careful not to use it too much or too little. After it is combined, a synthetic product of mercury can be obtained, which has unique properties.
The second method is to combine realgar and mercury. Realgar is warm and yellow in color. First smash realgar, mix it with mercury in a certain ratio, and put it into a special cauldron. This cauldron needs to be well sealed to prevent the escape of mercury. Then burn it with a martial fire, so that the two are initially melted, and then turn to a gentle fire, and boil it carefully. During this period, it needs to be checked from time to time. When its color and texture change, and it is shaped like a paste, it is a synthetic product.
The third method is to combine mercury with sulfur. Sulfur heat can make mercury cold. First, the sulfur is finely ground, and it is co-placed in a stone mortar with mercury to grind with a pestle. When grinding, it is necessary to use force evenly to make the two fully mixed. At first, mercury and sulfur contradict each other, and then gradually blend. When they are fused into one and the color is uniform, the preliminary synthesis is successful. Then the mixture is placed in a furnace and fired at a suitable temperature to further combine it, and different properties of synthetic mercury can be obtained. It is mostly used in alchemy and medicine.
All these methods require careful attention to many elements such as heat, proportion, utensils, etc. If there is a slight difference, it will be difficult to synthesize, or it will not have the expected properties. Therefore, the operator should be cautious.

In the genus of Fu Haibo, there are many things to pay attention to during storage and transportation.
When it is stored, the placement of the first heavy goods. Different categories of things should be separated according to their characteristics. Such as flammable and explosive things, should be placed in a safe place, away from fire and heat sources, and surrounded by fire-extinguishing and explosion-proof equipment to prevent accidents. And such as perishable fruits and vegetables, fresh goods must be stored at a suitable temperature and humidity, or stored in an ice cellar, or in a special cabinet to keep them fresh. Furthermore, valuable things, such as gold and silver jewelry, rare antiques, need to be guarded by special personnel, and have strong locks and strict protection to prevent theft.
As for the time of transportation, changes in the weather cannot be ignored. Before going to sea, you must observe the sky carefully. In case of strong winds, rainstorms, and signs of huge waves, you must suspend the journey and wait until the weather is fine and the sea is calm before sailing. During the voyage, you also need to pay attention to changes in the weather at any time. If there is any abnormality, you must quickly find a safe harbor to avoid. And the repair and maintenance of the ship is also very important. Before departure, you must carefully inspect the hull to check whether it is damaged or leaked, whether the machine is running normally, and whether the ropes and sails are firm. If there is any minor damage on the way, it should be repaired immediately to prevent small disasters from becoming serious disasters.
The scheduling and management of the crew is also related to the safety of the ship. The crew must perform their duties and be skilled. The driver should be familiar with the course and accurately control the current and wind direction; the lookout should have a keen eye, pay attention to the surrounding movements, and detect dangers such as reefs, shoals, and other ships in time; and the person responsible for loading and unloading the goods should be careful and operate according to the rules to avoid damage to the goods or slipping into the sea.
All these are things that the sea ship should pay attention to during storage and transportation. A little carelessness can lead to disaster, causing damage to property and casualties.