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What are the main uses of 4-chloropyridine?
In "Tiangong Kaiwu", there are three main uses for saltpeter. The first is used to make gunpowder. Its book says: "In gunpowder, sulfur is pure yang, and nitrate is pure yin. The two essences are forced together to form a sound and change. This universe is a magical thing." Saltpeter is a key ingredient in gunpowder, mixed with sulfur, charcoal, etc. in a specific ratio, and skillfully matched, gunpowder can have a strong explosive power, which is widely used in military, fireworks and many other fields. In the military, the launch of firearms depends on the explosive power of gunpowder, and saltpeter is indispensable; in the production of fireworks, the brilliant bloom of gunpowder also benefits from the participation of saltpeter.
Second, saltpeter can be used as medicine. Many ancient physicians have recorded that saltpeter has the functions of clearing away heat and purging fire, softening and dispersing knots, etc. The "Compendium of Materia Medica" also mentions the medicinal properties of saltpeter. It can be used to treat some heat syndromes, accumulation and other diseases, and can adjust the balance of yin and yang in the human body. It can remove evil spirits and correct diseases and heal diseases.
Third, saltpeter also has important uses in the field of smelting metals. In the smelting process, saltpeter can be used as a flux. "Tiangong Kaiwu" records the relevant metallurgical methods. Saltpeter can reduce the melting point of ore, promote the separation of metals and impurities, and improve the purity and efficiency of metal refining. It is of great significance to the development of metal smelting technology. It helps to make all kinds of metal products. Whether it is the construction of weapons or the production of daily utensils
What are the physical properties of 4-chloropyridine?
Mercury is fluid and changeable in nature. At room temperature, it is in a liquid state alone, which is different from all things. Its color is silver-white, radiant like a mirror, and its luster is eye-catching. It flows under the light and shines, which is very beautiful to see.
The quality of mercury is heavier than that of ordinary things. Take a container, inject mercury into it, and it feels heavy. It can be seen that its density is quite large. And the surface tension of mercury is very different. It drips on other things, often aggregates into beads, which are round and flexible, and are not easy to disperse. If the lotus leaf is exposed, this is its second characteristic.
Furthermore, mercury has good electrical conductivity, although it is not as good as gold and silver, it can be seen. In order to connect it to the circuit, the current can flow smoothly, which may be beneficial for various electrical purposes.
The volatility of mercury cannot be ignored. In the air, mercury quietly evaporates and turns into mercury vapor, which pervades the surroundings. This vapor is colorless and odorless, but it is toxic. If people inhale it, it will hurt the body for a long time, damage the organs and nerves, and cause great harm.
The chemical properties of mercury are lively and changeable. It is easy to oxidize in case of heat to form mercury oxide; when it encounters sulfur, it quickly converges into mercury sulfide. The speed of change shows the activity of mercury. And mercury can dissolve many metals to form amalgam, such as gold and silver, which can be mixed with mercury, and the shape and properties are changed. This is another characteristic of mercury.
What are the chemical properties of 4-chloropyridine?
4 - It is the essence of matter, and its properties are extremely strange. Of all the elements, its atomic weight is the smallest, and it often exists in the sky and earth.
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< br For example, in the case of metallurgy, the oxygen in the oxide of gold can be used to precipitate the original metal. This property is like that of a man, who helps others, and in the process of material transformation, the work cannot be reduced.
However, it also has its properties. It is flammable and explosive, and it is mixed in the air. In case of open flame and high temperature, it will explode violently. Therefore, those who use it should be careful to prevent it from happening in the first place.
This, the nature of transformation, not only has the ability to benefit things, such as the supply of energy, but also contains the risk of suffering. The method of use can be used in the world, and it can be used in a hundred and numerous ways. If you use it carelessly, you will suffer immediately. It is based on the research and application of the world, the degree of improvement, and the avoidance of harm, in order to obtain its benefits and avoid its harm.
What are the preparation methods of 4-chloropyridine?
To make a hydrogen balloon, there are various ancient methods. First, it is made of zinc and dilute sulfuric acid. Although this is not detailed in Kaogong Ji, the method of modern chemistry can be pushed. Take a few pieces of zinc, place them in a vessel, and slowly pour in dilute sulfuric acid. The two touch, that is, a biochemical reaction. Zinc is exchanged with hydrogen ions in sulfuric acid, and hydrogen is produced. The reaction formula is: $Zn + H_ {2} SO_ {4} = ZnSO_ {4} + H_ {2}\ uparrow $. This hydrogen can be collected by draining and gathering gas, and it can be filled in a balloon.
Second, it can also be used as a solution of aluminum and sodium hydroxide. Aluminum is active, and when it encounters sodium hydroxide, it also produces hydrogen. First prepare a solution of sodium hydroxide and put the aluminum sheet into it. The reaction is violent, and the hydrogen billows out. The reaction formula is: $2Al + 2NaOH + 2H_ {2} O = 2NaAlO_ {2} + 3H_ {2}\ uparrow $. This hydrogen can also be collected by drainage and filled in balloons.
Third, the ancient method may be made of metals and acids, such as iron and dilute hydrochloric acid. Take iron filings and put them in dilute hydrochloric acid. Iron reacts with hydrochloric acid, and iron replaces hydrogen in hydrochloric acid. The formula is: $Fe + 2HCl = FeCl_ {2} + H_ {2}\ uparrow $. The method of collecting air can also be used to drain water, and then fill it with balloons.
However, be careful, hydrogen is flammable, and there is a danger of explosion in case of open flames and hot topics. Make and use it to avoid fire candles, be careful to prevent accidents.
What are the precautions for 4-chloropyridine during storage and transportation?
and storage, first of all, it is necessary to use suitable containers. The performance of the container is very high, and it is easy to pass through many materials. Therefore, it is necessary to use high-quality and sealing materials, such as special gold alloy or composite materials, to prevent leakage. Second, the control of the storage environment. It can be liquid under low temperature and high temperature, so the storage requirements are very high. If the temperature is high, the pressure will rise, and it will be dangerous to life; if the temperature is low, it may affect its physical properties, and it also consumes a lot of energy to maintain specific properties.
As for the safety of the first tool, the safety of the first priority is the safety of the tool. Both the pipeline and the groove should have a high degree of sealing and safety. The pipeline, pipeline materials, and welders are of good quality, and they should be checked regularly to prevent leakage. The groove should be guaranteed to be fixed and the unloading system is reliable. Furthermore, it is very important on the way. It is necessary to prepare the first and last, and master the necessary conditions, such as force and degree of resistance. Once there is a problem, take immediate measures. In addition, the safety of the road should not be ignored. Avoid densely populated, flammable and explosive environments, etc., to reduce the risk of accidents. Therefore, 4-% of the total storage time is not enough, and it is necessary to be cautious to ensure safety.
