1,3-thiazole-5-carbaldehyde

Arsenic, or arsenic trioxide, is highly toxic. It is often produced by processes such as calcination and sublimation of arsenic-containing minerals.
Although arsenic is highly toxic, it is also useful in medicine, agriculture and other fields.
In medicine, an appropriate amount of arsenic can be used as medicine. Ancient physicians have recognized that arsenic can be effective in treating certain diseases. In today's medical view, arsenic can play a unique pharmacological role in the treatment of specific cancers such as leukemia. It can help kill cancer cells, relieve the disease to a certain extent, and provide new ideas for cancer treatment.
In agriculture, arsenic has been used to make pesticides. In the past, agricultural pest control technology was limited, and arsenic could effectively kill many pests and protect crops due to its toxicity. However, due to the strong toxicity of arsenic, the residue is easy to cause environmental pollution and human and animal poisoning, and it has been freshly used today.
It is also recorded that arsenic may have an auxiliary role in the metallurgical field. It can assist in the removal of impurities and improve the purity and quality of metals in some metal smelting processes. However, this application requires strict dosage and operation to prevent arsenic from escaping and causing environmental pollution and personal harm.
In summary, although arsenic is highly toxic, it can also be used in specific fields after reasonable application. However, caution must be used to prevent endangering life and the environment.

"Tiangong Kaiwu" says: "Sulfur is the liquid of stone, and it is also produced in the soil. Its quality is pure yang but not yin." In today's words, potassium nitrate has a cold nature and a bitter taste, and has strong oxidizing properties.
Sulfur, its color is yellow, and its nature is pure yang. In fire, it burns, and the flame is blue-purple, producing choking smoke. This is the manifestation of its chemical properties. In medicine, it has the effect of repelling scabies and killing insects in ancient times; in work, it is an essential material for making gunpowder.
As for potassium nitrate, that is, potassium nitrate. Its nature is cold, its taste is refreshing and bitter. Looking at its physics, it is white and fine, mostly in a crystalline state, easily soluble in water. In terms of its chemical properties, it has strong oxidizing properties. In ancient times, it was mostly used for alchemy, and later it was also a key ingredient of gunpowder. Gunpowder is made of sulfur, potassium nitrate and charcoal, and it explodes when ignited. Its power is amazing, all of which depend on the oxidizing properties of potassium nitrate.
Therefore, sulfur is pure and yang, and it burns to produce smoke; potassium nitrate is cold and fine, and has strong oxidizing properties. Both of them are very useful in ancient medicine and technology. They are really a wonder of heaven and earth, and a wonderful product of creation.

Methyl ether has unique chemical properties and various characteristics.
First of all, its flammability. Methyl ether can burn stably in the air, emit a light blue flame, and emit a lot of heat when burned. The reaction equation of its combustion is roughly:\ (2CH_ {3} OCH_ {3} + 7O_ {2}\ stackrel {ignited }{=\!=\!=} 4CO_ {2} + 6H_ {2} O\). In this regard, methyl ether can be used as a fuel and has its own uses in the field of energy. Because it produces carbon dioxide and water when burned, it is slightly less polluting than traditional fossil fuels, or it can be one of the clean energy sources.
Second, its solubility. Methyl ether is slightly soluble in water, but it can be miscible with many organic solvents such as alcohols, ethers, acetone, etc. This property is very important for chemical preparation and separation and purification. For example, in the process of organic synthesis, if some organic compounds need to be separated, they can be extracted according to the different solubility of methyl ether and different substances, so as to achieve the purpose of separation and purification.
Furthermore, methyl ether is weakly alkaline. Under specific chemical reaction environments, methyl ether can exhibit its alkaline properties and react with acids to form salt compounds. This property can be used in organic synthesis, or can be used to regulate the pH of the reaction, affecting the process of the reaction and the formation of products.
The chemical stability of methyl ether is good. Under normal conditions, methyl ether is not easy to react with many substances spontaneously. However, under special conditions of high temperature, high pressure or the presence of catalysts, methyl ether can participate in various chemical reactions, such as cracking reactions, oxidation reactions, etc. With this, by controlling the reaction conditions, methyl ether can be converted into other useful chemicals and its application in the chemical industry can be expanded.
In summary, the chemical properties of methyl ether are rich, and it has potential application value in many fields such as energy and chemical industry. Good research and application will surely contribute to the development of the world.

"Tiangong Kaiwu" says: "Where a mirror is cast, gray sand is used for the mold, and tin and copper are used for copper." If you want to make a armor weapon, there are three methods, let me explain in detail.
First, the material is selected to be the most heavy. Iron needs to be carefully selected, and impurities need to be removed to obtain a tough foundation. When choosing iron as the best, you must have a pure texture before you can cast armor. Tin is also the key. Adding it in an appropriate amount can increase the hardness and toughness of iron. The ratio of the two is exquisite, such as the harmony of the piano and the sound, to create a high-quality armor.
Second, the method of melting. Hold iron in a large furnace, and the blast will support the combustion, so that the iron will melt into molten iron. Control of the heat is about success or failure. If the fire is weak, the iron will be difficult to melt, and if the fire is strong, the iron will be vulnerable. When the molten iron is boiling, cast tin at the right time, and stir with a long spoon to make the two blend seamlessly. This process requires full attention. If there is a slight mistake, all previous efforts will be wasted.
Third, casting and forming. Prepare the mold, use sand as the mold, and carefully carve it, so that the mold pattern is meticulous and fits the nail pattern. Slowly inject the melted molten iron into the mold, and wait for it to cool and form. When cooling, do not be too hasty, but wait for it to cool down naturally, so that the iron will not crack. After forming, polish it to remove its burrs, so that the nail surface is smooth, which is not only protective, but also beautiful. < Br >
The method of making armor iron requires excellent material selection, smelting method, and fine casting, all of which are indispensable. Only in this way can we create tough and sharp armor and iron weapons, defend our country, and make achievements.

Looking at today's market, the price of rice millet often changes with time, and also varies with real estate. As for the price of rice, in the past, when it was a good year, each stone was worth about one tael to one or two taels of silver. If you apologize every year, the price may rise, and each stone can reach two taels or even three taels.
However, this is the price of the past. In today's world, the market situation is complicated, and various factors are mixed, resulting in fluctuations in the price of rice. In four places, the price is also uneven. In most prosperous cities, merchants converge, and the circulation of rice and grain is convenient, and the price may be stable; while in remote villages, it is difficult to transfer, and the price may be slightly high.
The price of rice today, in general, is between three and five yuan per catty for ordinary rice. If it is a fine rice seed, which comes from a plump place and has been carefully cultivated, the price may increase, and it can reach five to ten yuan per catty. And the price changes due to the year's prosperity, the gathering of merchants, and the political revolution. It is difficult to determine the exact number. Only by looking at the market conditions can we know the general idea. The price of millet may vary from rice, and it often depends on the quality of the variety and the amount of harvest. Roughly, it hovers between two and six yuan per catty. This is all common, and the market changes, but it is difficult to measure in the end.