Benzene, 1,4-Diiodo-2-Nitro-

"Tiangong Kaiwu" says: "Where there is nitrate, all Huayi are born, and China specializes in the northwest." Saltpeter, with its unique chemical properties, is widely used in many fields.
The main component of saltpeter is potassium nitrate (KNO 🥰), which is a strong oxidant. When decomposed by heat, it will release oxygen, which makes it play a key role in the preparation of ancient gunpowder. Ancient people mixed saltpeter, sulfur, and charcoal in a specific ratio to make gunpowder. In this process, the oxygen decomposed from saltpeter provided a combustion-supporting force for the combustion of sulfur and charcoal, which triggered a violent reaction, released huge energy, and achieved the power of gunpowder. It was widely used in military and fireworks.
Furthermore, saltpeter also played an important role in ancient metallurgy. Due to its strong oxidizing properties, it can accelerate the oxidation of impurities in metal ores, making it easier to separate from metals, thereby improving the purity and efficiency of metal smelting.
Saltpeter is also useful in the field of medicine. It is recorded in many ancient medical books such as the Compendium of Materia Medica that saltpeter has the functions of clearing away heat and purging fire, detoxifying and reducing swelling, and can be used to treat some heat syndromes, sores, swelling and other diseases.
In addition, saltpeter absorbs a lot of heat when dissolved in water, resulting in a significant decrease in the temperature of the solution. Therefore, in ancient times, people used this property to make ice. In the heat of summer, saltpeter is dissolved in water to obtain a low-temperature environment and realize simple ice making for cooling.
To sum up, saltpeter, as an important chemical substance, has shown unique and important chemical properties and practical value in ancient China's military, metallurgy, medicine, refrigeration and other aspects.

Sodium borohydride is quite commonly used in many chemical reactions, and the following are its common uses:
First, in the field of organic synthesis, sodium borohydride is often used as a reducing agent. Because sodium borohydride has moderate reducing properties, it can reduce aldose and ketone to alcohol. For example, in the reaction of aldehyde substances and sodium borohydride, aldehyde groups (-CHO) will be reduced to hydroxyl groups (-OH). This reaction condition is relatively mild, easy to operate, and widely used in the organic synthesis of alcohols. For example, benzaldehyde reacts with sodium borohydride to obtain benzyl alcohol.
Second, sodium borohydride also plays an important role in the reduction process of certain metal ions. Under specific conditions, it can reduce metal ions in metal salt solutions to metal elementals. For example, gold ions (Au ³) can be reduced to elemental gold (Au), which is widely used in the preparation of materials, especially in the preparation of nano-metal materials, and can obtain metal nanoparticles with uniform particle size and good dispersion.
Third, in the field of chemical plating, sodium borohydride is often used as a reducing agent in the plating solution. Taking electroless nickel plating as an example, sodium borohydride can reduce the nickel ions in the plating solution and deposit them on the surface of the substrate to form a uniform and dense nickel coating. The coating has good corrosion resistance and wear resistance and is widely used in electronics, machinery and other industries.
Fourth, sodium borohydride is also used in the reduction reaction of some nitrogen-containing compounds. For example, imines can be reduced to amine compounds, thus providing an effective method for the synthesis of amine compounds. This reaction enriches the way to construct nitrogen-containing compound structures in organic synthesis.

Curcuma is a traditional Chinese medicine, and its processing method has been in place since ancient times. The following is a detailed description of its processing method:
1. ** Purification **: After picking the curcuma, the first thing to do is to remove its impurities, wash the dirt, and then dry it in the sun to remove its filth, so as to obtain a pure curcuma. As the "Thunder Cannon Burning Theory" says: "All the enablers use a fine file on the acacia anvil first, but use raw black beans and purple-backed sunflower. When the two natural juices are soaked for three volts, they are wet and dried on the willow fire." Among them, "before the fine file on the acacia anvil", it is mentioned to clean the curcuma to ensure the purity of the medicine.
2. ** Cut **: Clean the curcuma, infiltrate it moderately, until it is soft and does not lose its toughness, slice and set aside. Thin slices are conducive to frying out the medicinal effect, and thick slices can slow down the release of medicinal power. As mentioned in the "Compendium of Materia Medica": "Curcuma curcuma, used today, is fried with vinegar. Or cooked into medicine, it is also good." Before frying and cooking its vinegar, it goes through many cutting processes to make the curcuma curcuma into an appropriate shape for subsequent processing and application.
3. ** Vinegar **: Take the clean curcuma slices, add an appropriate amount of rice vinegar and mix well, simmer until the vinegar liquid is exhausted, put them in a pot, heat them over a slow fire, fry dry, and take them out to cool. Vinegar can introduce medicine into the liver, enhance the power of curcuma to break blood and promote qi, eliminate accumulation and relieve pain. For example, "Materia Medica Meng Quan" says: "Pengshu, vinegar boiling can stop pain." The acid of vinegar can coordinate with curcuma, enhance its effect of removing blood stasis and relieving pain, so that the power of medicine is more specialized in the liver meridian qi and blood.
4. ** Wine production **: Using wine to moisten curcuma is also a method of processing. The wine has the properties of refreshing and dispersing, which can help curcuma to disperse its medicinal power and activate meridians and collaterals. Take the curcuma tablets, spray them evenly with rice wine, slightly stuffy, put them in a pot and stir fry them slightly over gentle heat, and take them After the wine is prepared, the power of activating qi and promoting blood circulation is even better, and the curative effect is better in the diseases of meridian obstruction and poor qi and blood.
5. ** Fried **: Fry the curcuma, that is, put the curcuma tablets in a hot pot, fry slowly until the surface is slightly yellow and slightly burnt. Fried can ease the strong medicinal properties of curcuma, make its power to break qi slightly slower, and is more suitable for those who are weak and have stagnation. After frying, the smell of curcuma becomes fragrant, which also helps to improve the taste and is easy to take.

The Book of Heavenly Works says: "Every year, those who take fertilizer first, bury them in the cellar, and take them out before the rain in the coming year, and divide them into different categories." However, in the market of taro, there are also areas that can be explored.
Taro, which is used in the field of diet, can be used for a wide range of purposes. Steamed, its taste is sweet, just like the ancient village man, often in autumn, digging taro and steaming it for his family. When boiled, you can add it to the soup, so that the taste is mellow, just like the Yashi cooking tea, adding a special taste. And the taro can be made with powder, which is used in the cake. As in the past, rich people used to make people, and the taro powder was used in the cake, and the taste was more delicious.
Furthermore, in the field of use, taro also has its effect. In ancient times, taro has a sweet, refreshing and flat nature, and has a small poison. It can be dissipated and dispersed. It is used to treat diseases such as poison and poison. In the past, in the Lang, this thing was often used to enter the fields, causing people to suffer from diseases.
In addition, taro also has its use in the field. Its plants can be used as fertilizer, returned to the fields, and fertile soil, just like the natural method of following the way to go, and it will continue to grow.
In this way, the use of taro in the market, the effect of delicious meals, and the help of food, can be used in many fields, such as stars, illuminating all aspects of life.

Bottle gourd, also known as gourd, has its physical characteristics. The outer skin of bottle gourd is usually light-colored, the color is fresh, and the ground is smooth. However, there is also no lack of micro-treatment on it. It can be felt that the surface is slightly undulating, just like the marks of heaven.
Its shape is many, and it is often in the shape of a bottle, just like the flute of ancient times, which is elegant at the end; or the belly of the bottle, if it is the fruit of the bottle, it can be silly. This shape is different from the difference between the product and the raw environment.
As far as the ground is concerned, the bottle gourd meat is low, the water content is high, and it is very brittle and tender. With a little force, there is a risk of cracking. This characteristic also makes it easy to absorb flavor during cooking, and it can skillfully integrate with ordinary ingredients and raw materials to create a good quality.
Furthermore, the proportion of bottle gourd to water, if placed in water, it can float leisurely, like a boat floating on a blue wave. This is because its body is porous, and the hollow shape makes it so, which does not add to its graceful appearance in water, but also reflects the delicacy of creation.
And its durability cannot be ignored. The mature bottle gourd skin has a certain durability. In the past, the ancients often used it as containers, utensils and other things. With the container, it can hold all kinds of things; with the container, it can play the sound of leisure, which is all about its sexual support, and shows the rich value of bottle gourd in life and culture.