Thiophene-3-aldehyde

Mercury, commonly known as mercury, is one of the metals. Its physical properties are very different and can be observed.
Mercury is in a liquid state under normal temperature and pressure, with silver flickering and flowing amorphous, resembling a smart silver liquid. This is its remarkable appearance feature. Its fluidity is very good, and it can slide quickly on the surface of various utensils, making it difficult to hold.
Furthermore, the melting point of mercury is extremely low, only -38.87 ° C, which makes it liquid in most ordinary environments. In contrast, common metals need high temperatures to melt into liquid. The boiling point of mercury is also not high, at 356.6 ° C. It is easier to vaporize when heated and turn into mercury vapor. < Br >
The density of mercury is extremely high, about 13.59 grams per cubic centimeter, far exceeding that of many common liquids, such as water, which has a density of only about 1 gram per cubic centimeter. Therefore, if mercury is placed in water, the mercury will sink to the bottom, and the potential to sink is decisive.
And mercury has good electrical conductivity, which can conduct current in circuits. This property makes it also used in the field of electronics. However, although it conducts electricity, it is different from ordinary solid conductive metals. Due to its liquid form, the use scene has its own unique features.
Mercury has a large surface tension. On a flat surface, it often aggregates into a round bead shape, resembling a silver-white pearl, which is not easy to spread. This is due to the special force between surface molecules.
Looking at the physical properties of mercury, they are all unique and may be useful in various industrial and scientific research fields. However, due to their toxicity, extreme caution is required when using mercury.

Mercury is a metal, and it is liquid at room temperature, with a silvery white and metallic luster. Its chemical properties are quite unique and outstanding in many aspects.
Mercury has moderate chemical activity. When it encounters sulfur, the two are easily combined to form mercury sulfide. This reaction is rapid and significant, and the ancients often took this property to deal with mercury leakage. Sulfur and mercury meet, like a match made in heaven, and the two combine into black mercury sulfide. This process is a wonderful manifestation of chemical changes.
Mercury also has a unique performance in oxidation reactions. When heating mercury, mercury can react with oxygen to form mercury oxide. This mercury oxide is a red powdery substance, and this reaction reveals that mercury can combine with oxygen under certain conditions, revealing its oxidizing properties.
Mercury can form amalgam with many metals, which is another important chemical property of mercury. The so-called amalgam is an alloy formed by mercury and other metals. If mercury is mixed with sodium, sodium amalgam can be formed. The formation of amalgam changes the original properties of metals and has important uses in metallurgy, chemical industry and other fields.
Mercury compounds also have a wide variety and different properties. Such as mercury chloride, which is toxic and has a certain solubility in water, its chemical properties are active and can participate in many chemical reactions. Another example is mercury nitrate, which is also a common mercury compound with strong oxidizing properties and is used in chemical experiments and industrial production. Mercury has unique and complex chemical properties and occupies an important position in the chemical field. However, due to its toxicity, it should be used and handled with great care to avoid endangering the environment and human health.

"Arsenic is the descendant of tin," says Tiangong Kaiwu. "It is also a material, and it is toxic in nature, but it can also be used." Arsenic-3-A arsenic has its uses in many fields, and there are traces to follow from ancient times to the present.
In the field of medicine, although arsenic is highly toxic, it can also be used as medicine after being cleverly processed and reasonably matched. In ancient times, doctors used arsenic in small amounts to treat some stubborn diseases, such as scabies and sores. Today, modern medical research has also found that arsenic has a unique effect in the treatment of leukemia and other diseases. Arsenic contains arsenic, which can induce leukemia cell apoptosis. This is a major medical discovery, which makes arsenic shine in the field of treatment of specific diseases.
In agriculture, arsenic can be used to make pesticides. In the past, it was formulated as an insecticide to deal with field pests. Because of its toxicity, it can effectively kill many harmful insects, protect crops from insect infestation, and ensure harvest. However, due to its excessive toxicity, arsenic poses a great threat to the environment and human and animal safety, and is rarely used today.
In the industrial field, arsenic-3-methylarsenic has its uses in glass manufacturing, non-ferrous metal smelting and other industries. In the production of glass, an appropriate amount of arsenic can be used as a clarifying agent to remove bubbles in the glass liquid and improve the transparency and quality of the glass; in the smelting of non-ferrous metals, it can assist in the separation and purification of metals, improve the purity of metals, and optimize the smelting process.
It can be seen that although arsenic-3-arsenic is highly toxic, it can also exert its unique value in the fields of medicine, agriculture, industry, etc., and bring benefits to human production and life. The advantages and disadvantages depend on each other.

"Tiangong Kaiwu" is an ancient scientific and technological masterpiece in our country, but there is no record of "the production method of arsenic-3-methylmercury". Arsenic, chemically called arsenic trioxide, is a highly toxic substance. Methylmercury usually refers to methylmercury, which is also a highly toxic substance.
However, in ancient books, there are many obscure records about the preparation of poisons and related substances or scattered in the content of alchemy and medicine. In ancient times, the preparation of such highly toxic substances was mostly known to alchemists or doctors. If it is said in ancient classical Chinese, there may be the following conjectures.
Arsenic is often made from arsenic-containing minerals, such as realgar, orpiment, etc., which are roasted and sublimated. The ancient method is to choose pure arsenic-containing ore, place it in a special crucible, and calcine it at high temperature over charcoal fire. The temperature in the furnace needs to be precisely controlled. If the heat is too high, the arsenic will be easily volatilized and lost, and if the heat is not enough, it will be difficult to convert it into arsenic. When the ore melts, the smoke rises, and after cooling, white or yellowish arsenic crystals can be obtained on the wall and top of the crucible.
As for methylmercury, although there is little clear production method in ancient times. However, the extraction of mercury is often obtained by heating and decomposing Dan sand (mercury sulfide). If you want to make methylmercury, you may need to use mercury as a base, supplemented by specific organic raw materials, in a sealed container, and age and react for a long time. Some sorcerers mixed some plant sap with mercury, sealed it in porcelain jars, and buried it underground for months or even years. During this period, they may use earth gas or yin gas to catalyze reactions in order to generate substances such as methylmercury. However, this is all speculation, and the production of such highly toxic substances is extremely dangerous and illegal today, and must not be tried.

The market price of the crab is actually influenced by various factors. It is originally a rare thing, born in remote soil, and it is not easy to harvest, so the initial price is quite high.
Its market price is related to the time of day. If the year is peaceful, the wind and rain are smooth, the crab reproduces smoothly, and the supply of goods is sufficient, the price will be leveled. However, in case of disasters, such as droughts and floods, the production of the crab will drop sharply, and the price will rise.
The geographical location is also an important factor. The origin is far and near, and the cost of transportation is different. In a place near the city, the cost of freight is small, and the price is relatively easy; in a remote area, after twists and turns, the freight will accumulate, and the price will be high.
People are also heavy. When crabs enter the market, the influence of the merchants' means of operation on the price is not light. If merchants compete, they all want to sell their goods quickly, or make concessions, the price may drop; if merchants conspire, stock up on goods, and raise prices in order to make a good profit, the price will skyrocket.
Furthermore, the likes and dislikes of the world also affect the price of crabs. Today's fashion, if the crabs are rare and compete for purchases, their prices will rise; if the world changes, the good ones are rare, and the price will fall.
To sum up, the market price of nail crabs fluctuates due to changes in the weather, the difference in geographical location, the ingenuity of people and the transfer of the world's good, and there is no certainty. Or more expensive than gold beads, or cheaper than ordinary things, it all depends on the situation.