Mercury is a liquid metal with a white and metallic luster at room temperature. It is often obtained by burning in Dan sand. It is volatile and the vapor is toxic. If inhaled, it will damage the nervous, digestive and immune systems.
Water is the source of life, a colorless, odorless and transparent liquid. Stable at room temperature and pressure, with high specific heat capacity, can regulate the climate and maintain the temperature of life. It is a good solvent, soluble in many substances, and plays an important role in chemical reactions.
Hexachlorobenzene is a white crystalline solid, insoluble in water, and has high chemical stability and thermal stability. However, it is bioaccumulative and persistent, difficult to degrade in the environment, easy to accumulate through the food chain, endangering the health of organisms, and posing a potential threat to the ecological environment.
Of the three, mercury is known in the world for its special metal liquid state and toxicity; water is needed for all things with its life-sustaining function and wide solubility; hexachlorobenzene attracts attention due to its stability and environmental hazards. Each has its own unique physical properties, and it needs to be treated with caution in nature and human life, either as a good friend or as a hidden danger.

Mercury, commonly known as mercury, is a liquid at room temperature, with a shimmering metallic luster. Its density is quite large, its fluidity is good, and it is easy to form fine mercury beads. Mercury's volatility cannot be underestimated, and it can evaporate slowly in the air. Its vapor is toxic, and it is harmful to human health if inhaled. Mercury has moderate chemical activity and can form amalgamations with many metals. This property was also used in metallurgy and other techniques in ancient times.
Water is the source of life, a colorless, odorless and transparent liquid. Its boiling point is one hundred degrees, and its freezing point is zero degrees. The specific heat capacity of water is very large, and it is effective in regulating climate and maintaining biological body temperature. Water is an excellent solvent, and many substances can be dissolved in it. This property is indispensable in the process of material transportation and chemical reactions in living organisms. Water can also participate in many chemical reactions, such as hydrolysis and hydration reactions.
Ribose is a carbohydrate, one of the five-carbon sugars. Its structure has an aldehyde group and a ring-like structure. Ribose is very important in living organisms. It is an important part of ribonucleic acid (RNA) and participates in the transmission and expression of genetic information. Ribose is chemically active, and can undergo reactions such as oxidation, reduction, and ester formation. It plays a key role in biochemical reactions such as energy metabolism and substance synthesis in living organisms.

Mercury, lead, and cadmium are all highly toxic metal elements, which are used in many fields, but they are very harmful to the human body and the environment.
Mercury, commonly known as mercury, is a liquid at room temperature and is easy to evaporate. It was often used in alchemy, medicine, and gilding processes in ancient times. In alchemy, alchemists believed that mercury could be refined into a medicine for longevity, causing many emperors and nobles to be poisoned by taking mercury-containing pills. In the field of medicine, mercury compounds have been used to treat skin diseases, syphilis, etc. However, mercury toxicity has great side effects, which can cause mercury poisoning and damage the human nervous system, kidneys, etc. In industry, mercury is used to make thermometers, sphygmomanometers, fluorescent lamps, etc. However, if it is not handled properly, mercury leaks into the environment, is converted into methylmercury by microbial action, and is enriched through the food chain, which seriously endangers human health.
Lead has a soft texture and strong corrosion resistance. In ancient times, lead was used to make wine utensils and food utensils, causing lead to enter the human body with the diet and damage human health. At that time, people did not realize the toxicity of lead. The Roman Empire widely used lead containers to store wine and transport water, causing lead poisoning, which affected the physical quality of the people and may have an impact on the decline of the empire. In modern times, lead is mainly used to make batteries and is indispensable in automobiles, electric vehicles and other fields. However, in the process of lead mining, smelting and battery production and recycling, if improper environmental protection measures are taken, lead is easy to pollute soil and water sources. After the human body ingests lead, it can affect the nervous system, hematopoietic system, and digestive system, especially for children's intellectual development.
Cadmium, malleable and wear-resistant. In ancient times, it was rarely used. In modern industry, cadmium was used for electroplating to prevent metal corrosion; in the manufacture of nickel-cadmium batteries, it has the characteristics of high energy density and long life. However, cadmium is highly toxic. Cadmium-contaminated soil grows crops with high cadmium content. Long-term consumption of cadmium can cause cadmium poisoning, such as the "pain disease" in Toyama Prefecture, Japan, which is caused by the accumulation of cadmium in the body caused by local residents drinking cadmium-containing river water and eating cadmium-containing rice for a long time,
In short, although mercury, lead, and cadmium have certain uses in industries and other fields, due to their high toxicity, they must be used and handled with caution, and environmental protection measures must be strengthened to prevent them from polluting the environment and endangering human health.

The synthesis of naphthylthiophene is related to all kinds of wonderful methods and is the essence of chemical industry.
First, it is made by electrophilic substitution. Select aromatic hydrocarbon substrates with good activity, such as benzene derivatives, and meet with naphthylthiophene-containing precursors with the help of specific catalysts, such as aluminum trichloride. Under moderate temperature and pressure, the active groups of the precursors are induced by the catalyst to launch electrophilic attacks on specific positions of aromatics. In this process, the power of the catalyst is indispensable, which can reduce the energy barrier of the reaction and promote the speed of the reaction. Such as the adjacent and para-position of the benzene ring, the electron cloud density is high, and it is often favored by electrophilic reagents. The precursor of naphthylthiophene is then combined with it to form the corresponding substitution product. After subsequent purification and separation, pure naphthylthiophene can be obtained.
Second, it is prepared by condensation reaction. Compounds containing carbonyl groups and sulfur-containing active groups are selected as raw materials, such as an aldehyde and sulfur-containing alcohols. In alkaline or acidic media, the reaction of condensation between the two occurs first. In alkaline environment, the sulfur anion of thiol has strong nucleophilicity and attacks the carbonyl carbon of aldehyde to form an intermediate. Then, through a series of changes such as intramolecular rearrangement and dehydration, the core skeleton of naphthylthiophene was constructed. In acidic medium, the carbonyl group is protonated to enhance its electrophilicity, and the thiol is attacked. It also follows a similar reaction path to obtain the target naphthylthiophene.
Third, the coupling reaction catalyzed by metal is also a good strategy. Take halogenated naphthyl group and thiophene group-containing borate or tin reagent, etc. Under the catalysis of metal catalysts such as palladium and nickel, the metal is first oxidized and added to the halogenated naphthyl group, so that the carbon-halogen bond is broken, and the metal is bonded to carbon. Then, the reagent containing thiophene group is metallized with the metal intermediate, and the thiophene group is transferred to the metal center. Finally, through reduction and elimination steps, a carbon-carbon bond is formed to obtain the naphthylthiophene product. This method has good selectivity and can accurately construct the connection between naphthylthiophene group and thiophene group, and is widely used in the synthesis of complex naphthylthiophene derivatives.
This method has its own length, depending on the availability of raw materials, reaction conditions, product purity and other factors. It is a wonderful way to synthesize naphthylthiophene, which helps the chemical industry to move forward.

One of them is that when it is hidden, it is necessary to pay attention to the general situation, so as to ensure its effectiveness.
One of them is that when it is hidden, it must be dried and passed. These three properties are different, but they are all tidal. If it encounters tides, the sand is easy to deliquescence, and the borax may also be affected by it, causing its properties to change or even fail. Therefore, it is necessary to use sealed tools, such as pottery pots and porcelain bottles, to prevent intrusion.
Second, it is necessary to avoid strong shock collisions. This stone is often solid, and it is easy to break. Under the collision of strong shocks, it may also affect its use. And on the way, you should also pay attention to the degree and degree of the environment, and do not let it be in high tide places.
Third, you need to separate other objects. Sand, borax, etc., or some things are reactive. Therefore, if you hide it, you should not mix it with acid, soluble substances, etc., so as to avoid reversal and reduce its integrity.
Fourth, it is clear. If you hide it or hide it, you should explain the name of the object, the nature, and the things you pay attention to outside the container, so as to prevent confusion or use.
It is necessary to pay attention to all kinds of things, such as sand, borax, and other stones, in the treasure, in the environment, in the equipment, in the method of isolation, and in the clarity, in order to preserve its integrity and use it.