3-Fluoropyridine-2-carbaldehyde

3 - Yanghe - 2. The main purpose of the carcass is to use it. The carcass, in the world, each has its own use, but the most important thing is not to worry about the balance of production.
Nature, the carcass is diverse, and it is widely divided. It is an important position in the food industry. There are scavengers, and the carcass is cleaned up by the carcass. The grass, trees, and carcasses of the carcass, if the carcass is decomposed and the carcass is piled up, the environment will be affected by it. The carcass-eating carcass has its special ability to make the soil fertile and promote the growth of the soil. This is a great achievement in the life of the carcass.
Furthermore, some of them are the pollinators of plants. Not only are bees and other people familiar with it, but there are also problems with pollination. They shuttle through the flowers and plants, and their bodies are contaminated with pollen. From one flower to another, they help plants complete the process of pollination and ensure that plants continue to multiply. This is essential for maintaining the diversity of plants.
It is also a food for many organisms., small mammals, etc., all feed on armor. The existence of armor provides the necessary support for some organisms to support their survival and reproduction.
In addition, in human life, armor also has its uses. In ancient times, some armor can be entered. Its practical value may be able to cure diseases and save people. Today's people have studied or transformed its practical use, but it also plays a role in the past.
It seems small, but it has important uses in many aspects such as biological balance, plant reproduction, biological growth, and even human life. It is an indispensable one of natural things.

Mercury is one of the hardware. Its nature is clear and spiritual, and its physical properties are unique. The details are as follows:
Mercury is liquid at room temperature, which is its remarkable characteristic. All kinds of metals, mostly in solid state, only mercury flows like water, silver light flickers, and it is very agile. "On Hardware" says: "Mercury, its shape is like water, like silver and flows." Looking at it, it is warm and lustrous, slippery and stagnant, like a god-sent spiritual liquid.
The melting point of mercury is extremely low, about -38.87 ° C. In the realm of severe cold, thousands of trees wither and water freezes, but mercury can still maintain a liquid state and flow freely, not restricted by severe cold. " Although the "Tiangong Kaiwu" does not specify its melting point, it can be inferred that it is not afraid of cold condensation based on its state at room temperature.
The boiling point is relatively low, about 356.6 ° C. If it is heated by fire, mercury is easy to vaporize into mercury vapor, curling and rising, like light smoke. This property makes mercury easy to transform into forms in many alchemy experiments and processes, and is heavy by alchemists.
The density of mercury is quite high, reaching 13.59 grams/cubic centimeter. Placed on other things, it can often sink because of its weight. If mercury is dumped in water, it will fall directly to the bottom like beads on a jade plate, and it will be completely separated from water and will not blend with each other.
Mercury has good electrical conductivity. Although it is not as widely known as metals such as gold, silver and copper, it can also conduct current in electrical circuits and make electrical appliances run. This property may have unique effects in the use of some delicate mechanisms and secret techniques.
Mercury is highly volatile and quietly emits mercury vapor in the air. This vapor is colorless and odorless, but it is toxic. If inhaled inadvertently, it is harmful to human health. When the ancients were refining alchemy, they often did not understand this property, causing mercury to enter the body, damage the viscera, and endanger life.
The surface tension of mercury is extremely high, and it drips on a flat object. It gathers but does not disperse, like a silver bead, round and full, with a moving luster. A little touch, it rolls freely and is difficult to attach.
The above physical properties make mercury used in ancient alchemy, medicine, technology and many other fields. However, due to its toxicity, it should be treated with caution and should not be ignored.

Mercury is highly volatile and can vary widely, unlike other things. As for water, the chemical properties of methylmercury are not stable.
Mercury is a liquid metal at room temperature, with a silver luster and strong fluidity. Its melting point is very low, only -38.87 ° C, and its boiling point is only 356.6 ° C. This property makes it volatile, and it can slowly turn into mercury vapor and disperse in the air at room temperature. Mercury vapor is toxic. If inhaled by humans, it can cause serious health damage and damage the nervous system, kidneys and other important organs.
Methylmercury is an organic compound of mercury. Its chemical properties are more active than elemental mercury, and its stability is not good. Methylmercury can be produced and transformed in various ways in the environment. For example, under the action of microorganisms, inorganic mercury can be converted into methylmercury. Methylmercury is highly soluble in organic solvents and can combine with macromolecular substances such as proteins and enzymes in organisms. This binding ability makes methylmercury easy to accumulate and amplify in organisms, and it passes through the food chain layer by layer, causing great harm to organisms at the top of the food chain, including humans.
And in the chemical structure of methylmercury, the bond formed between mercury and carbon is not very strong. Under certain conditions, in case of light, acid-base changes or certain chemical reactions, this bond is easy to break, causing methylmercury to decompose or transform, forming other mercury compounds. This also indicates the instability of the chemical properties of methylmercury.
Therefore, the chemical properties of methylmercury are not stable, and it is constantly changing in the environment and organisms, posing a potential threat to the ecological environment and human health.

There are two ways to make ethylene today. One is the dehydration of ethanol. For ethanol, concentrated sulfuric acid is used as a catalyst and heated to 170 degrees Celsius to remove a molecule of water to form ethylene. The chemical formula is: $C_ {2} H_ {5} OH\ xrightarrow [170 ^ {\ circ} C] {concentrated sulfuric acid} CH_ {2} = CH_ {2}\ uparrow + H_ {2} O $. In this reaction, concentrated sulfuric acid has both catalytic and dehydration functions. During the reaction, it is necessary to pay attention to temperature control. If the temperature is not reached or too high, it can cause side reactions. For example, when the temperature is 140 degrees Celsius, ethanol will dehydrate intermolecules to form ether.
The second is the method of petroleum cracking. Petroleum, containing a mixture of many hydrocarbons. After high temperature cracking, macromolecular hydrocarbons can be broken into small molecular hydrocarbons, and ethylene is an important product of petroleum cracking. Commonly used raw materials for petroleum cracking include naphtha and heavy oil. Under the conditions of high temperature (about 700 to 800 degrees Celsius, or even more than 1,000 degrees Celsius) and catalyst, the chemical bonds of macromolecular hydrocarbons are broken, rearranged and combined to form small molecular olefins such as ethylene and propylene. This process can obtain a large amount of ethylene, and is very beneficial to the deep utilization of petroleum resources, which can provide rich basic raw materials for the chemical industry.
These two are common ethylene preparation methods, each with its own characteristics and applicability. The ethanol dehydration method is relatively simple to operate and the product is relatively pure; the petroleum cracking method can produce ethylene on a large scale and is widely used in industry.

The price of turtle varies from time to time, and varies from place to place. Looking at the various markets, the ups and downs of its price are quite fascinating to everyone's eyes.
The price of husband turtle is first and foremost related to the category. The armor of good breeds is plump in body, delicious in meat, and has a lot of nourishing power. In the city, it is also very expensive. Such as wild armor, born in rivers and lakes, eating natural bait, its quality is high, and the price is several times higher than that of the captive. And artificially raised armor, although there is no shortage of high-quality products, has a higher yield and a slightly lower price. The price per catty of artificially raised turtle common in the city may be around tens to hundreds of dollars, depending on its size and grade.
Secondly, the season is also the main reason for the price of turtle. Every autumn and winter, the weather is getting colder and colder, and everyone wants to use nourishing food to control it. Turtle meat is beautiful and has a nourishing effect, so the demand increases greatly at this time, and the price also rises. On the contrary, in spring and summer, when the climate is warm and people's diet is more light, the demand for turtle is slightly reduced, and the price may drop.
Furthermore, regional differences also have an impact on the price of turtle. In the water town Zeguo, the production of turtle is quite abundant, it is easier to obtain, and its price is cheap. In remote places, the transportation of turtle is not easy, and the supply is limited, and the price is expensive.
And changes in market supply and demand also affect the price of turtle. If there are many breeders for a while and the supply is excessive, the price will not be high even when the demand is strong in autumn and winter. On the contrary, in case of natural disasters and diseases, the production of turtle will drop sharply, and even if the spring and summer need to be flat, the price may rise.
Overall, the price of turtle in the market, the category, season, region, supply and demand factors interact. If you want to know its exact price, you must visit the city and observe it, depending on the time, you can get it.