2-Pyridinemethanol, 5-chloro-, methanesulfonate (ester)

What are the chemical properties of this substance? This question is quite difficult and needs to be investigated in detail.
The chemical properties of the substance are the characteristics of the substance in the chemical change. To understand the chemical properties of this substance, first look at its reaction with other substances.
If this substance encounters acid, or reacts violently, such as the emergence of bubbles, heat and luminescence, it may have active metallic properties and can replace hydrogen with acid. And if it encounters alkali, or precipitates, or the solution changes color, this can show its chemical properties.
Furthermore, look at its redox properties. If it is easily oxidized and gradually changes color and quality in the air, it can be known that it is reductive; if it can oxidize other things and reduce itself, it is oxidizing.
It is also necessary to check its stability. When heated, if it decomposes into other things, it can be known that its thermal stability is poor; if it can still maintain its original state under high temperature, it is stable.
Second look at its solubility. In water or organic solvents, the state of dissolution is different, and it can also reflect its chemical properties. Soluble, or has a special effect with solvents; insoluble, or does not match the solvent due to molecular structure.
In addition, its acidity and alkalinity are also important chemical properties. If you try it with an acid-base indicator, you can know its approximate acid-base attribution. Those that are acidic may be able to neutralize with bases; those that are alkaline may react with acids.
However, with only a few words based on this, it is difficult to determine the chemical properties of this substance. It must be based on experiments, and after many attempts, we can understand the full picture of its chemical properties by carefully observing its reactions with various substances.

The physical properties of this substance are related to its external appearance and intuitively perceivable characteristics. Its shape may be solid, or regular, or irregular, or lumpy, or powdery, depending on the method of its generation and the environment in which it is located.
Its color may be bright or light, and it can be red, orange, yellow, green, blue, purple, or colorless and transparent, just like crystal clear, or as dark as ink. The difference in color and luster can often help to distinguish.
As for the texture, it is either hard as stone, which can resist the invasion of external forces; or soft like cotton, which feels gentle to the touch; or it is brittle and fragile, and it will turn into powder with a little external force. < Br >
Its density is also one of the important physical properties. If the density is greater than water, it will sink in water; if it is less than water, it will float on the water surface. This property is useful in many practical applications, such as when separating different substances.
Melting point and boiling point cannot be ignored. The melting point is the temperature at which a substance changes from solid to liquid; the boiling point is the temperature at which it changes from liquid to gaseous. Knowing these two is of great significance in the purification and processing of substances. If ore is smelted by fire, at a certain temperature, some substances in the ore melt and can be separated from other impurities.
In addition, its conductivity also belongs to the category of physical properties. If it is a good conductor, it can conduct current in the circuit, such as copper, silver, etc.; if it is an insulator, it is difficult for the current to pass through, such as rubber, ceramics, etc. This characteristic is widely used in the electrical field. Wires need good conductors, while insulating materials are used to ensure safety and prevent current leakage.
Thermal conductivity is also one of them. Good thermal conductors can quickly transfer heat, such as metals, which are often used in cooking utensils to distribute heat quickly and evenly; while thermal insulation materials have poor thermal conductivity and can be used for heat preservation, such as foam plastics, which can resist heat transfer and keep the temperature constant.

The author of "Tiangong Kaiwu" is the scientific and technological classics written by Yingxing of the Song Dynasty in the Ming Dynasty. The main use of it is as follows.
First, it contains all kinds of crafts and technologies in detail. The book has detailed accounts in various fields of agriculture and handicraft industry, such as cereal cultivation, silkworm breeding, textile printing and dyeing, ceramic firing, metal smelting, papermaking and printing. In terms of ceramic firing, there are clear explanations from the selection of soil and billet, to the control of the temperature and atmosphere when firing in the kiln, so that future generations can see the exquisite craftsmanship of the ancients, which can be an important basis for the inheritance and development of traditional crafts.
Second, it has scientific research value. There is no lack of scientific understanding of many material properties and changing laws in the book. For example, the description of the characteristics and chemical reactions of various metals in metal smelting provides precious materials for the study of chemical history. And the production process described in it, combined with scientific principles, is of great significance in exploring the development of ancient science and technology.
Third, it is related to economic and social history. The production activities recorded in "Tiangong Kaiwu" reflect the economic and industrial conditions at that time. From the distribution of crop cultivation, the agricultural economic pattern at that time can be observed; and the scale and division of labor of various industries in the handicraft industry can also help our generation understand the social and economic structure and commercial development of the Ming Dynasty, and contribute to the study of economic and social history.
Fourth, inspire modern science and technology and innovation. Although the book was written in ancient times, the hard-working wisdom and the spirit of striving for excellence in craftsmanship contained in it can be used for reference in today's scientific and technological development and innovation. The systematic thinking and ingenious design it shows are still instructive in today's industrial manufacturing, technological research and development, so that today's people can draw inspiration from it to introduce new ideas and seek technological progress.

The method of making a certain utensil is subtle. I have heard all the skills contained in "Tiangong Kaiwu". Today, in terms of utensil preparation, I will briefly describe the method.
If you are making pottery utensil, it is very important to choose the soil at the beginning. You must find delicate and moderately sticky soil in the mountains and rivers. When you come back from taking the soil, you first mix it with water to make it smooth, and remove its gravel and sundries. After that, the craftsman takes the method of rotating or hand-sculpting to form it. The wheel maker places the soil on the pottery wheel, and uses the rotation of the wheel to shape it by hand, which can form a regular tool; the hand-sculpting depends entirely on the craftsman's ingenuity and skills, pinching, rubbing, pressing, pressing, giving soil to shape, or for a simple state. After
is formed, it is fired in the kiln. The temperature of the kiln is the key. The temperature in the kiln needs to be gradual, and it needs to be dried on a low fire at the beginning to remove its moisture and prevent the utensils from drying and cracking. Then the fire gradually intensifies, reaching thousands of degrees, so that the clay is sintered. In the meantime, observe the color of the heat and the shape of the smoke to control the firing process. If the heat is too light, the pottery will be loose; if the heat is too fierce, it may cause the utensils to deform or burst.
As for the casting metal utensils, the metal ore will be smelted in the furnace first. The ore is selected to identify its type and purity. The furnace uses charcoal as fuel, and the blast supports combustion to melt the ore into liquid. When the liquid metal is pure and free, pour it into the pre-made fan. The fan is made of mud, wood or metal, and is made according to the shape of the utensil. The liquid metal enters the fan, and when it cools and solidifies, it is removed from the fan, and then polished and trimmed, and the utensil is formed. When polishing, make the surface smooth, or engrave with patterns to increase its appearance.
Another example is a wooden utensil. Select good wood as the material, depending on its texture and texture. Saw into the required material plate, and use axes, chisels, planers and other tools to cut, chisel, and planer out the prototype of the utensil. The method of mortise and tenon is particularly delicate. The mortise and tenon are used to enter the mortise, so that the wood is connected to the wood. There is no need to nail and rivet, but it is Then apply paint, the paint can protect the wood and add color. Apply the primer first, then polish it after drying, and then apply the topcoat, and repeat it several times to make the paint smooth and bright.
All these methods of making utensils depend on the heart of the craftsman. They are passed down from generation to generation, and the wisdom and skills are integrated into the utensils to obtain exquisite and practical utensils.

When using this item, you need to pay attention to many things. First, observe its texture and appearance. When looking at the material of the object, it should be tough and flawless. If there is any damage or cracks, you must use it with caution to prevent changes during use. Second, clarify its usage and regulations. Each object has its own specific way of use, and must not be used arbitrarily. It must be handled in accordance with established laws in order to perform its function. Third, review its applicable environment. In different places and at different times, the use of this object may vary, and the situation must be carefully considered to make the object suitable for the situation. Fourth, pay attention to its maintenance and placement. After use, it should be properly placed, according to its physical properties, or moisture-proof, or sun-proof, or corrosion-proof, and regular maintenance to prolong its life. If you do not comply with these matters, you may damage this product, or the user may suffer unexpected harm. Therefore, when using this product, you must be careful and thoughtful to achieve the purpose of safety and efficiency.