pyridine-3-carboxaldehyde

Sodium amalgam is an alloy of sodium and mercury. Its chemical properties are unique, and it has the characteristics of both sodium and mercury, and it changes due to the different proportions of the two.
Sodium is active, and it reacts violently in contact with water, releasing hydrogen and forming sodium hydroxide. Mercury is a liquid metal at room temperature and has relatively stable chemical properties. When sodium and mercury form an amalgam, its activity is lower than that of pure sodium.
When sodium amalgam encounters water, although it can also react with water, the reaction is less violent than that of pure sodium. This is because the presence of mercury slows down the rate of contact between sodium and water, making the reaction milder. The essence of the reaction is still the replacement reaction between sodium and water. Sodium loses electrons to form sodium ions, and hydrogen in water gains electrons to form hydrogen gas.
Sodium amalgam is widely used in the field of organic synthesis. Because it can provide active sodium atoms and the reaction is relatively easy to control, it is often used to reduce specific organic compounds. For example, some carbonyl-containing compounds can be reduced to corresponding alcohols.
In the metallurgical industry, sodium amalgam is also used. It can be used to extract certain metals from ores and use its activity to replace the target metal from the compound.
Furthermore, sodium amalgam has better stability than pure sodium, making it easier to store and transport. However, when using it, it is still necessary to operate with caution, as it eventually contains active sodium, and certain substances such as water will still react. Therefore, appropriate safety procedures should be followed to prevent accidents.

In addition to the negative three, what is the common synthesis method of methyl ether? This is a question related to the chemical process. Methyl ether, that is, dimethyl ether, has two common synthesis methods.
One is made by dehydration of methanol. In ancient times, there was a method to obtain methyl ether by this method. This is methanol under appropriate catalyst and temperature and pressure conditions, which removes a molecule of water between molecules to obtain methyl ether. For example, although the synthesis of methyl ether is not detailed in Tiangong Kaiwu, the reason for chemical industry is involved. The method of dehydration of methanol can be compared to the transformation of many substances in the book. A suitable catalyst, such as gamma-alumina, is placed in a reactor, and methanol steam is introduced to maintain a suitable temperature, about 200-300 ° C, and the pressure is about 0.5-1.5 MPa. Dehydration reaction occurs between methanol molecules, and two methanol molecules remove a molecule of water to form methyl ether.
Second, the direct synthesis of synthesis gas. This is a direct synthesis of methyl ether using carbon monoxide and hydrogen as raw materials under the action of a specific catalyst. The catalyst is very critical, and it is often a metal oxide composite catalyst, such as copper-zinc-aluminum catalyst. Syngas in a certain proportion, the ratio of carbon monoxide to hydrogen is about 1:2, into the reaction device, at a suitable temperature of 200-300 ℃, pressure 2-10 MPa, through the action of a catalyst, a complex reaction occurs to generate methyl ether. This synthesis gas has a wide range of sources and can be obtained from gasification of coal, natural gas, etc. Just as various raw materials in "Tiangong Kaiwu" are converted through different processes, synthesis gas is also prepared by gasification and other processes, and then synthesized by catalytic reaction. Methyl ether.

The sage of ancient times, who observed the suitability of yin and yang, distinguished the benefits of all things, and made this device to meet the times of the sky. It is very important in the realm of sacrifice. Sacrifice is a grand ceremony of worshiping gods and worshiping ancestors, and it is necessary to show piety. The fire taken by the yang flintlock is pure and sacred, so it is often used here to make the ceremony solemn and solemn.
Furthermore, it is also applied in the realm of medical treatment. The ancient healer, who knew the fire of the yang flintlock, had the power of pure yang, and with it, moxibustion could warm the meridians and collaterals, dissipate cold and dehumidify. "The Yellow Emperor's Nei Jing" says: "Needles are not suitable, moxibustion is appropriate." The moxibustion of the fire of the sun can make the medicinal power reach the sick place and heal the diseases.
Military aspects are also indispensable. In wartime, beacon fire is related to the transmission of military information. The fire of the sun can quickly make fire to burn the beacon fire, warning and summoning messages, and ensuring the peace of the frontier. In case of a surprise attack at night, the fire of the sun can be used as lighting to help soldiers gain insight into the enemy's situation and defeat the enemy.
In life, the convenience of the sun is not uncommon. In daily cooking, if the fire is hard to find, the sun can use the sun to make a fire to solve the urgency of cooking. Travelers are on the way, and there is no fire in the wilderness. Using the sun to make fire can warm, drive away animals, and ensure a safe journey.
From this perspective, Yang Fengni is of great use in the fields of sacrifice, medical treatment, military affairs, and life. It is actually the crystallization of the wisdom of the ancients and has a profound impact on social operation and people's livelihood.

Lead and mercury, its properties are special. Lead, heavy in quality but heavy in nature, dark and astringent in color, often in a smooth state, stable at room temperature, melting when heated, flowing like liquid silver, cold and condensed, malleable. Its use is also, in the past, casting tools and welding, all rely on its quality. However, it is also toxic, long-term contact or disease, damage to people's bodies, messy internal organs, so use it with caution.
Mercury, also known as mercury, is shaped like water and heavy in quality, white like silver, flowing indeterminately and shining. At room temperature, it is only liquid, and its sex is flexible and difficult to control. Its dissipation speed can be turned into gas in the air, and it can be harmful to the body if inhaled. Ancient alchemists often used mercury to refine medicine in the hope of longevity, but they often caused the disaster of poisoning.
Both lead and mercury have the properties of metals, have good thermal conductivity and electrical conductivity, and can be used for industrial technology. However, its toxicity cannot be prevented. When lead and mercury encounter fire, mercury easily dissolves gas and escapes, and lead also changes into smoke or slag. The poison of its gas can invade the lungs and damage people's intelligence.
It is known that lead and mercury have advantages and disadvantages. Those who benefit, because of their quality, can be used in all kinds of skills, making tools and pharmaceuticals, and each can develop its strengths; those who harm, its poison can harm life and endanger life. Those who use it must understand its nature, pay attention to its laws, avoid its harm and promote its benefits, so as to be the best way.

Those who borrow from him the conditions for the storage of three buckets of rice millet, because of the needs of the family, in order to solve the temporary difficulties. In the countryside, he is based on diligence and diligence. Although he is not rich, he still has a little surplus on weekdays. This surplus is the basis for borrowing.
He is honest and well-known to the neighbors. If you borrow something from someone, you must clearly say the time limit for returning it, and you will repay it according to the time limit. It is because everyone believes it and is willing to communicate with it. If you borrow three buckets of rice millet, you must have a contract document, which states the number of borrowed items and the time of return, and there is a guarantor as a witness. This guarantor is also a highly respected and reliable person in the village, so as to prove that the borrowing is true and not deceived.
Or because of a sudden change in his family, such as a loved one who is sick and urgently needs money and food for treatment; or if the farming time is not good, he needs to buy seeds and fertilizer to protect the harvest of the fields, so he has this move of borrowing. However, when borrowing, he should also consider his own ability to repay, and should not borrow too much. If he borrows three buckets of rice millet, he must think about how to work and manage it, and pay it back as scheduled. Or when he is idle, he goes out to work to earn money; or he takes good care of the fields so that the harvest is abundant and can be used to repay debts.
Furthermore, he has always been good friends with his neighbors and helps each other on weekdays. When he is in trouble, everyone thinks of him as a human being on weekdays, and is willing to help him with three buckets of rice millet. And in the future, with a heart of gratitude, we will also repay the good deeds of others when they need it, and maintain the atmosphere of harmony and mutual assistance in the countryside. In this way, borrowing the storage conditions of three buckets of rice grains is not only related to the reputation of personal conduct, but also closely related to family changes, friendship in the countryside, and the planning of self-repayment.