5-Fluoropyridine-2-carboxaldehyde

Lead and mercury are the second kind of hardware. Lead is blue and black in color, heavy in quality and heavy in nature, often hidden in ore veins. It is soft in nature and can be molded, making it widely used. Mercury, also known as mercury, is as white as silver, and it is liquid at room temperature. It flows away smartly and is difficult to fathom.
The chemical properties of lead are universal to metals. When exposed to strong acids, such as sulfuric acid and nitric acid, it can chemically react to form corresponding salts. However, its reaction rate is slower than that of active metals, such as iron and zinc. It can also combine with oxygen. When heated, lead oxide gradually appears on the surface, and the color turns gray.
The chemical properties of mercury are also interesting. Although it is a liquid metal, its chemical activity cannot be underestimated. It can combine with sulfur phase, and the two meet, that is, it reacts rapidly to form mercury sulfide, which is often used for mercury leakage treatment. Mercury can also form amalgam with a variety of metals, such as sodium, to obtain sodium amalgam, which is often used as a reducing agent in organic synthesis.
As for the comparison between the two, the chemical activity of lead is slightly less than that of mercury. Lead mostly exists in the world in a solid state, and its changes are relatively stable; mercury is shown in a unique liquid state, and its chemical changes are often agile. However, both are toxic and harmful to the human body and the environment. Therefore, when using it, be careful to prevent disasters.

The common method of synthesis of zinc is that there is no end to it. First, it is obtained by metallurgy. First, take the stone containing zinc, such as ZnS (ZnS), the method of baking, so that the vulcanization is reduced and oxidized (2ZnS + 3O ² baking → 2ZnO + 2SO ²). In addition, with coke and other primary oxidation, the reaction of ZnO + C is high → Zn + CO ↑, and then the gold is obtained.
Second, it is prepared by hydrolysis method. (such as sulfuric acid ZnSO) dissolved in water, prepared into a solution. Insert an inert layer into it, and through direct current flow, the oxidation reaction is generated, and the reaction is obtained. (Zn ²) to obtain the original precipitated gold (Zn ² + 2e → Zn). The result obtained by this method is high, and it is often used in the combination of high-grade requirements.
Third, the original method of reducing the original. Can be used for active gold, such as (Mg), etc., the solution of. Taking the solution of sulfuric acid as an example, the inverse equation is Mg + ZnSO → MgSO + Zn. This inverse is reversed, and the gold is precipitated from its solution by using the activity of.
There is also a steaming method, which is based on the characteristics of low temperature of the boiling phase. The material containing heat is added to the boiling temperature above the boiling temperature to make the heat melt, steam and collect it cold, and it can also be used to obtain gold. This method is used in different combinations due to factors such as raw materials, cost, and temperature requirements.

"Tiangong Kaiwu" states that the rice seeds are soaked and scattered on the seedling land. When they grow to a few inches, they are planted in the field. The germination of rice seeds is related to the weather, geographical conditions, and water and humidity. It must be appropriate to be smooth.
As for the origin of rice seeds, there are many productive places in the south. In the land of Jiangsu and Zhejiang, the water and soil are rich, and the rice seeds produced are suitable for the water towns and the country of Zeguo. The rice is soft and waxy and has a good taste. In the land of lakes and fertile fields, the rice seeds are also unique. They are resistant to waterlogging and have considerable yields. In the land of Fujian and Guangzhou, the climate is warm, and the rice seeds can adapt to the high temperature environment and can be more ripe in a year.
Rice seeds are suitable for different regions. In the land of Pingchuan, it is advisable to choose rice seeds that are resistant to fertilizer and lodging. Because the soil and water in Pingchuan are thick and the wind is slightly stronger, such rice seeds can ensure a bumper harvest. In the mountains, there is a slight shortage of water sources, so it is necessary to choose drought-tolerant rice seeds in order to grow well in the environment with limited water sources. In the lakeside water town, there is a lot of water and humidity, and it is advisable to choose rice seeds that are resistant to flooding to adapt to the watery environment.
In short, the application of rice seeds varies according to the shape of the mountains and rivers, the climate is warm and cool, and the water and soil are dry and wet. Farmers need to carefully observe the local conditions and choose rice seeds carefully in order to have a good harvest. This is the key to farming.

I look at your question and inquire about the market price of Liang Xiangqi and Otto. However, the two involved are not detailed, and it is difficult to find relevant confirmation in ancient books, so I will answer by speculation, for reference only.
If Liang Xiangqi is a rare treasure or rare item, in the ancient market, its price should depend on its rarity, whether the craftsmanship is complicated or not, and the material is expensive and cheap. If it is made of finely crafted jade with unique patterns, or by the hands of famous craftsmen, in the city where Fujiayun gathers, the price may reach a thousand gold. However, in remote places, no one knows its rarity, or it is only worth a few gold.
As for the second fish, if it is a common river fish, in the fish market, the price per catty may not be much. If this fish is a rare species, such as strange color, unique habits, and difficult to catch, in many places where curious eaters are, its price may be twice that of the usual fish, reaching more than ten dollars a catty.
It needs to be clear that this is all speculation, and it is difficult to determine the true market price of Liang Xiangqi and the second fish. Because of the name involved, it has not been heard from the well-known ancient objects and biological lists, and can only be based on common sense and ancient trading practices.

The genus of fish and shrimp is discussed in "Tiangong Kaiwu", in which the storage of fish is mentioned, which is quite detailed.
The storage of fish, the land of the first heavy pond and marsh. It is necessary to choose a place where the water and soil are fertile, the water source is abundant and the circulation is good. The size of the pond and marsh depends on the amount of storage, but it should not be too narrow. If it is narrow, the fish will not have a wide area to swim, and it will be short of breath and difficult to grow; it should not be too wide. If it is wide, it will be difficult to care for, and it will be prone to all kinds of changes. The bottom of the pond should be flat, and it should be paved with fat mud, which can nourish all kinds of microorganisms in the water and serve as food for fish.
As for water storage, it cannot be exhausted or overflowed The color of the water should be green and clear, green is rich in nutrients, and fish can eat floating things in the water; clear is the state of the fish, so as to check whether it has disease. The water source should be common, and the new water should be exchanged for the old water, so that the water is alive. If there is a stagnant pool, the fish are prone to disease and die.
Furthermore, the types of fish should be well matched. Carp, crucian carp, lamb, and the like have different habits and eating habits. Carp crucian carp like sundries in mud, carp are addicted to aquatic plants, and bream mostly take algae floating on the water surface. If they are mixed, they will have something to eat, and they will not compete for food. The resources of the pond and marsh can be used well.
Also, when raising, it is necessary to prevent natural enemies. Water birds, otters, and the like often want to prey on pond fish. Therefore, it is necessary to set up a net cover on the pool, or let people patrol, in case it is not a concern.
And the growth of fish is related to the solar term. In spring and summer, the sun is warm, and the fish are active and growing fast. At this time, more food should be fed; in autumn and winter, the air is cold, and the fish eat less and grow slowly. Feeding should be reduced. Feeding can be collected from aquatic plants and grains, or from worms and worms that grow in the pool. Feeding should be quantified at the time, and should not be more or less, so as to avoid discomfort in the fish body.
All these are the important principles for fish and shrimp storage. According to this, the effect of fish and shrimp flourishing can be obtained.