7-bromo-1-benzothiophene

Mercury is a highly toxic substance, but it also has specific uses in many ancient alchemy classics "Tiangong Kaiwu".
Mercury was quite important in ancient alchemy. Although "Tiangong Kaiwu" did not focus on alchemy, at that time alchemy was popular. Mercury, as a commonly used substance in alchemy, was often used by alchemists to refine so-called elixirs that could make people immortal. The alchemists believed that through complex refining procedures, mercury and other substances could be converted into miraculous elixirs, achieving the effect of prolonging life and becoming immortals. This concept originated from the ancient people's strong desire for eternal life and limited understanding of material changes.
In the field of ancient metallurgy, mercury also had its uses. Mercury can be used for mercury amalgamation to extract gold. Because mercury can form amalgam with gold, the ancients took this property to mix gold-containing sand with mercury, so that the gold was dissolved in mercury, and then the mercury was evaporated by heating to obtain higher purity gold. This method played a key role in the ancient gold mining and refining process, and to a certain extent promoted the development of gold production.
Furthermore, in ancient medicine, mercury and its compounds were occasionally used. The ancients believed that mercury had certain medicinal effects. For example, in some external medicines, a small amount of mercury-containing substances would be added to treat skin diseases such as scabies and sores. However, the toxicity of mercury was not fully understood at that time, and such applications also caused potential harm to the human body to a certain extent.
To sum up, mercury had its uses in ancient alchemy, metallurgy, and medicine, but with the development of cognition, people have become more concerned about its toxicity and more cautious about its application.

Mercury is a highly toxic substance, and its physical properties are quite unique. Mercury is liquid at room temperature, which is its remarkable property. It has excellent fluidity, like smart water, and can roll freely on a flat surface.
Mercury has a silver-white and metallic luster, which is dazzling, like moonlight, which is impressive to watch. Its density is very high, and it is particularly heavy compared to many common substances. When you weigh it in your hand, you can feel its thick texture.
Furthermore, the boiling point of mercury is low, only about 357 degrees Celsius. With a little heating, it is very easy to vaporize and turn into mercury vapor. The freezing point of mercury is also low, about minus 38 degrees Celsius, and it will condense as a solid state at lower temperatures.
The surface tension of mercury is so great that when it comes into contact with other objects, it often aggregates into a spherical shape, making it difficult to spread evenly. This property makes mercury droplets like round pearls on a flat surface, rolling freely.
Mercury is a good conductor of heat and electricity. Although its electrical conductivity is not as good as that of metals such as copper and silver, it can also exert good thermal conductivity under certain conditions.
In addition, mercury can form alloys with most metals, which are called amalgams. After many metals are fused with mercury, their properties will change, and they have unique uses in industry and other fields. However, it is necessary to keep in mind that mercury is highly toxic and must be used with extreme caution when exposed to it, so as not to be negligent, so as not to endanger life and health.

Mercury is a highly toxic substance with unique chemical properties. Mercury is normally a liquid metal with a silvery white color and good fluidity.
Mercury has moderate chemical activity. Although it does not react violently with other substances like potassium and sodium, it can also combine with many elements. For example, mercury can react rapidly with sulfur to form mercury sulfide. This reaction was often used in ancient times to treat spilled mercury, because mercury sulfide is relatively stable and less toxic.
Mercury easily forms an alloy with metals, which is called amalgam. In ancient times, amalgam was often used in the gilding process, that is, mercury and gold are made into amalgam, which is applied to the surface of the utensils, heated to evaporate the mercury, and the gold will remain on the utensils, giving the surface a golden luster.
Mercury can also react with oxygen. When heated, mercury will combine with oxygen to form mercury oxide. However, mercury oxide is easily decomposed into mercury and oxygen when heated, and this reaction shows the special reversibility of mercury's chemical properties.
In compounds, the common valence of mercury is + 1 and + 2. Mercury compounds with different valence states have different chemical properties. For example, mercury chloride (HgCl ²) is a white crystalline powder that is highly toxic and has a certain solubility in water; while mercurous chloride (HgCl ²), commonly known as calomel, has relatively weak toxicity and has been used in the field of medicine.
The chemical properties of mercury make it useful in many fields. However, due to its highly toxic properties, extreme caution is required when using and handling, and a little carelessness can cause serious harm to the environment and human health.

The combination of mercury in the ancient world has been found in ancient times, and it can also be obtained in "Tiangong".
One method can be borrowed from the mercury-containing substances of Dansha, which can be used together. Dansha, red in color, dry in nature. First take a measure of Dansha, place it in the crucible, and burn it with charcoal fire. When Dansha encounters high levels, the mercury will escape. This method is placed on the other side, so that the mercury will be exposed. Soft and good in nature, when mercury encounters, it will be attached to it. When it is to be cooled, it can be added to the mercury compound, and its ratio is determined by the temperature.
The second method is based on the characteristics of mercury liquid. Take a few, melt it into a liquid, and then put it on a flat stone slab. When it is slightly cold and has not yet fully condensed, drop mercury on it. Mercury is like beads, flowing freely, and it melts with the liquid. Mix the two with the material, so that the two are mixed evenly. In this way, mercury enters the water and synthesizes new substances. However, in this process, pay attention to the toxicity of mercury. If it is inhaled, it will be harmful to people.
Third, it can be combined with the help of water. In ancient times, scholars often mixed with water (that is, mercury) and grass and trees. For example, take a certain kind of grass containing water, take the juice, put the mercury and water together in the kettle, and add it densely. The composition of the juice may promote the chemical reaction of mercury, making it easier for the two to combine. After the reaction is completed, the cold kettle can be used to obtain the chemical compound. However, the dosage of the product in the product is not yet available, and it needs to be done before it can be obtained.

In the market, the price range of celery and green onions varies from time to time and place, and it is difficult to generalize. In the past, in a peaceful world, the market was prosperous and abundant, and the price of celery was only a few cents per catty. It is a common vegetable, widely planted in the fields, and the supply is sufficient, so the price is flat. Onions are often seasoned, and they are not thin. The price per catty may be slightly higher than that of celery, but they are also only a few dozen yuan. Although it is not a staple food, it takes a lot of work to pickle, or the price is slightly higher, or twenty or thirty yuan per catty.
If the weather is not smooth, such as drought and flood, the fields and vegetables are damaged, and the supply is reduced, the price will be more expensive. Celery may increase to dozens of words per catty, and green onions are similar.
As for the times of war, people's livelihood is difficult, and prices fluctuate violently. Food is hard to find, and such vegetables are even rarer. The prices of celery, green onions, and green onions may be so expensive that it is difficult for ordinary people to achieve. Or a catty of hundred words is still not available, because roads are blocked, merchants are difficult to travel, and supplies are scarce.
In short, the prices of celery and green onions in the market often change with the years, the current situation is chaotic, and the amount of supply and demand. There is no fixed number.