2-hydroxypyridine

The main uses of cyanyl are quite extensive.
In the genus of "Tiangong Kaiwu", although the name of cyanyl is not directly stated, the relevant principles may be involved in the production of various substances and various techniques.
Cyanyl is used in the chemical industry, and one of them can be used to make nitrile compounds. Nitriles can be hydrolyzed into carboxylic acids or reduced to amines. These two are extremely important in the manufacture of medicines and pesticides. For example, when making pharmaceuticals, amine compounds are often key intermediates, which can help form various special drugs to treat various diseases.
Furthermore, cyanyl is also useful in the field of polymer materials. It can be used as a monomer to polymerize into special polymers. These polymers have excellent properties, such as high strength, high heat resistance, etc. In the aerospace, electronic equipment and other industries, it can be an excellent material, and the equipment is strong and durable. It can meet special needs.
In the metallurgical industry, cyanide can be complexed with metal ions. For example, when gold is extracted, cyanide can dissolve gold into a complex, and then it can be separated and reduced to obtain pure gold. This technique is an important method in the gold industry for refining and increasing the purity and yield of gold.
And cyanide is also useful in the creation of dyes. It can give the dye excellent light resistance and washable properties, so that the color of the dye will not fade for a long time, and the color will last for a long time.
All of these are widely used and important, and are of great significance in various industries, promoting the progress of industry and the prosperity of science and technology.

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It is one of the hardware, and it has a physical property.
First of all, its color is gray, slightly dull, like a thin layer, less gold is bright, but it is naturally heavy. Its surface light is still good at first, but it has been exposed to the air for a long time, and it is raw and covered by an oxide film, and the light is also eliminated.
Then it is used to refer to the surface, and it can leave marks. Its ductility is not as good as that of gold, gold, etc. It can develop a thin sheet and form a thin foil; it can be pulled, and it can be turned into a thin foil.
And density, the density is large, and the starting point is sinking, which often has a lot of weight. This characteristic makes it useful for the combination of multiple metals, such as counterweight objects, which are often balanced by their large density.
The melting phase is not high, and the melting liquid is not long after the fire, and it is flowing, and the color is also brighter. And its boiling temperature is not high, and it is increased to a certain extent to reduce the leakage.
In addition, the good quality of the product, the performance of the product, and the quality of the product, etc., are also sufficient to make the product flow. In the past, it was also used for certain needs.
Therefore, the materiality of the material makes it have specific uses in various aspects such as workmanship and utensils. The ancients also made good use of its properties for manufacturing, counterweight, and other general matters.

The chemical properties of alum are quite unique. There are many kinds of alum, green alum, bile alum, etc. The chemical properties of different kinds of alum are also different.
Alum, that is, potassium aluminum sulfate dodecahydrate, has a cold nature. Hydrolysis can occur in aqueous solutions, and aluminum ion hydrolysis makes the solution acidic. This property makes it quite useful for purifying water. The aluminum hydroxide colloid produced by hydrolysis can absorb suspended impurities in water and clarify the water. And alum easily loses crystal water when heated and turns into white powder, which is a manifestation of its physical changes and chemical properties.
Green alum is ferrous sulfate heptahydrate. It has strong reducing properties and is easily oxidized in the air. The color gradually changes from light green to yellow-brown, due to the oxidation of ferrous ions to iron ions. Green alum is soluble in water, and its aqueous solution is also acidic, due to the hydrolysis of ferrous ions. In addition, green alum can react with alkali solutions to form a white precipitate of ferrous hydroxide. However, the precipitate is unstable, and it is rapidly oxidized in the air. After gray-green, it eventually becomes a reddish-brown precipitate of iron hydroxide.
Chalum, that is, copper sulfate pentahydrate, is blue in color. Its crystals lose crystalline water when heated, and the blue fades away and becomes white anhydrous copper sulfate powder. This process is reversible, and it can return to blue in contact with water. It is often used to test whether the substance contains water. The aqueous solution of bile alum is acidic due to the hydrolysis of copper ions. It can also undergo a displacement reaction with some metals. If iron is placed in the solution of bile alum, red copper will precipitate on the surface of the iron, because the metal activity of iron is stronger than that of copper.
Alum has diverse chemical properties and has applications in many fields. It has been recognized and used by people in ancient times. In the exploration of chemical changes and properties, the wonder of natural substances can be seen.

The man who cuts the wood is the scorn, and the kneading of the wood is the benefit of the scorn, so as to teach the world and cover all benefits. The method of making leigh is first in the selection of materials. It is advisable to choose strong and tough wood, such as zhe and mulberry, whose quality is dense and resistant to rot, which can be used for the handle of leigh and the body of leigh.
The selection of materials is established, which is a skill. For the handle of leigh, it should be along the texture of the wood, cutting it straight, grinding it slippery, about six feet long, the thickness is suitable for the hand, so as to hold it hard. The upper end should be slightly thicker, and grooves can be carved to install the cross wood. This cross wood is called "Sentence Wood", and people use it to help when plowing.
As for the scorpion, the wood needs to be cut into a flat blade shape, about a few inches wide, and the edge of the blade must be sharpened to make it easier to break the soil. The connection between the scorpion and the handle is crucial. Or the chisel holes are interlocked with tenons and mortise, and the tenons should be firmly embedded. The external rattan or leather rope should be used to bind it, so that the bond is tight, and it will not fall off and loosen during labor.
If it is a metal scorpion, it should be cast first. Its quality is rigid and its force to break the soil is stronger. After casting, the cutting edge also needs to be refined to make it sharp. And the metal scorpion is connected to the wooden scorpion handle, or it is tightened with a special hoop, or fixed with nails and riv
Also, in the work of making
, attention should be paid to details. The whole of
should strive for balance, so that the cultivator can use even force and not be biased. Every grinding and connection must be made with care. The scorpion made in this way can be a good tool for farming, helping the people between the fields, reclaiming the soil and the fields, and reaping the benefits of crops.

Collection and transportation are related to the lifeblood of the country. It is complicated and many matters must be paid attention to.
In terms of collection, the first priority is to choose a site. It is advisable to choose a high and open place to prevent water and water, and the transportation is convenient, which is convenient for materials to enter and exit. When building a warehouse, the structure should be solid and stable to prevent wind and rain erosion, rats and insects. The method of hiding is also exquisite. Different materials must be classified and stored in a well-organized manner to facilitate inventory and access.
Furthermore, the amount of collection should be planned. It should not be overrun, so as not to accumulate materials for a long time and rot; it should not be overrun, and it should not be unprepared when used. It must be carefully considered and reasonably stocked according to the current situation and demand. And it is the duty of regular inspection to check the condition of the materials. If it is damaged, it will be repaired, and if it is rotten, it will be removed to ensure that the hidden items are in good condition and usable.
As for transportation, it is related to whether the materials can arrive in time and safely. Choose a good transportation route, consider the terrain and road conditions, avoid obstacles and shortcuts, so as to save time and reduce losses. The transportation equipment should also be well-made, the car is sturdy, the boat is stable, and it should be repaired at any time to prevent damage on the way.
The person transporting must be cautious and responsible. The materials transported should be carefully counted and protected to prevent them from being damaged or stolen. And during the journey, inspections should be carried out frequently, and if there is an accident, they should be dealt with immediately.
And the timing of transportation should not be ignored. According to the urgency of materials, the order should be arranged. Those who are in a hurry should be transported first, and those who are delayed should be shipped later, so that the goods can be used to the fullest extent without delay.
The husband's collection and transportation, one collection and one loss, complement each other. The orderly collection and the proper loss can ensure the adequacy of materials and the smooth circulation. It is of great benefit to the governance of the country and the life of the people. We must pay careful attention.