quinoline-8-carbaldehyde

Acetylene is typical of alkynes and has unique chemical properties.
First, it is flammable. When burned, the flame is bright and accompanied by thick smoke, because the carbon content is quite high. The chemical equation of combustion is\ (2C_ {2} H_ {2} + 5O_ {2}\ stackrel {ignited }{=\!=\!=} {2} + 2H_ {2} O\), which is often used in industry for oxyacetylene flame. It can cut and weld metals, and the cover is extremely hot because of its combustion.
Second, the addition reaction is significant. Can be added with many substances. For example, with bromine water, bromine water can fade,\ (CH\ equiv CH + 2Br_ {2}\ longrightarrow CHBr_ {2} CHBr_ {2}\), which is a common method for identifying acetylene. With hydrogen addition, when the conditions are appropriate, ethylene is formed, and then ethane is formed,\ (CH\ equiv CH + H_ {2}\ stackrel {catalyst} {\ longrightarrow} CH_ {2} = CH_ {2}\),\ (CH_ {2} = CH_ {2} + H_ {2}\ stackrel {catalyst} {\ longrightarrow} CH_ {3} CH_ {3}\). Vinyl chloride can be obtained by adding hydrogen chloride, which is an important step in the preparation of polyvinyl chloride,\ (CH\ equiv CH + HCl\ stackrel {catalyst} {\ longrightarrow} CH_ {2} = CHCl\).
Third, polymerization can occur. Under specific conditions, acetylene can be polymerized into benzene,\ (3CH\ equiv CH\ stackrel {catalyst} {\ longrightarrow} C_ {6} H_ {6}\). And by the action of a special catalyst, it can be polymerized into polyacetylene. Polyacetylene has special electrical conductivity and has attracted much attention in the field of materials.
Fourth, acetylene is weakly acidic. Although the acidity is very weak, it can react with active metals. For example, it can react with sodium to generate sodium acetylene and hydrogen,\ (2CH\ equiv CH + 2Na\ longrightarrow 2CH\ equiv CNa + H_ {2}\ uparrow\). This property reflects that its hydrogen atom has a certain activity.

Lead and mercury are also the important things in alchemy. The common synthesis method involves the ancient alchemy technique.
In the past, alchemists wanted the medicine of longevity, and they were very careful in the synthesis of lead and mercury. One common method is to take a few lead first, put it in a cauldron, and burn it slowly with charcoal fire. Lead is soft and heavy, and melts in case of fire. When it melts into a liquid, mercury is slowly added. Mercury is fluid and lively, commonly known as mercury. The combination of the two requires a specific heat to control it. If the fire is too fierce, the mercury will evaporate easily; if the fire is too weak, the two will be difficult to melt.
Another method is to mix lead and mercury with various herbs. The properties of herbs can either assist in the synthesis of lead and mercury, or adjust its medicinal properties. For example, with cinnabar, cinnabar is red in color, and contains the essence of mercury. First, the cinnabar is ground into a fine powder, mixed evenly with lead and mercury, and then put into the pill furnace. After sealing the furnace, it is alternately calcined with the fire of civil and military. The fire is slow to raise it, so that the medicinal properties are integrated; the fire is forced to promote its synthesis.
However, although such synthesis methods were regarded as secrets by alchemists in ancient times, in today's scientific view, lead and mercury are all toxic substances. Lead entering the body can damage the organs and harm qi and blood; the poison of mercury can hurt the nerves and disrupt the mind. The ancients studied this synthesis method for longevity, but they did not know that there was a big harm in it. Although the method contains the ancients' exploration of material changes, the results are mostly not beneficial to the body, but rather the way to hurt the body. Future generations should be based on science, appreciate the gains and losses of the ancient times, and do not repeat the same mistakes.

In "Tiangong Kaiwu", within the eight provinces, there are many places where mirabilite is found, that is, there are many places where mirabilite is produced. It has wonderful uses in various fields.
In the field of medicine, mirabilite has the effect of diarrhea and accumulation, moisturizing dryness and softening, clearing away heat and reducing swelling. Doctors often use it to treat real heat stagnation, dry stool knots and other diseases. Such as gastrointestinal heat accumulation, dry feces and internal knots, abdominal swelling and pain. Mixing mirabilite with rhubarb and other medicines can facilitate stool and diarrhea. When used externally, it can treat sore throat, mouth sores, red eyes and carbuncle swelling and pain. Using mirabilite to dissolve water and apply externally to the affected area can clear away heat and reduce swelling and relieve local swelling and pain.
In industrial manufacturing, mirabilite is also indispensable. In glass manufacturing, mirabilite acts as a clarifying agent, which can reduce the viscosity of the glass liquid, promote the discharge of bubbles in the glass liquid, make the glass uniform and transparent, and improve the quality of the glass. In the paper industry, mirabilite can be produced through a series of reactions to produce the chemical raw materials required for papermaking, which helps the paper manufacturing process to be smooth.
In the printing and dyeing industry, mirabilite can be used as a dye facilitator. When dyeing, adding an appropriate amount of mirabilite to the dye solution can increase the dye uptake rate, make the fabric dyed evenly, and the color is bright and firm.
In leather tanning, mirabilite can be used for leather pretreatment. It helps leather hair removal, softening, enhancing leather flexibility and durability, and lays a good
In summary, mirabilite plays an important role in many fields such as medicine, industrial manufacturing, printing and dyeing, leather tanning, and is actually a widely used substance.

When you look at the city of the sharks, the changes in their price are like the illusion of the wind and clouds, and it is difficult to predict the end.
The price of the sharks in the city is not constant. It may be in a state of ups and downs due to the weather, geographical location, and personnel.
At this moment, if you are in a prosperous year, the property is prosperous, and the harvest of the sharks is quite abundant, the price of the sharks in the city may be trending downward. If there are many things to cover but the number of seekers has not increased, the merchants have to reduce their value in order to sell their goods quickly. However, if the weather is bad, such as droughts and floods, storms, causing the production of the sharks to decrease sharply, and the world is eager for it, the price will rise. And the kindness of human beings is also related to the price of armor sharks. If people love armor sharks at times, and regard them as delicacies, or think that their medicinal uses are miraculous, then there are many people who ask for them, and their price will be high; on the contrary, if the wind still changes, and everyone abandons them, the price will decline.
Also, in the four places, its feelings are different. In the coastal region, where armor sharks come out, their production is fertile and easy to obtain, and the price is flat; then when they go to the inland counties, they go to the sea a long way, and the armor sharks come, they go through land and water, and they spend a lot, and their price must be high. In addition, the risk of business travel and the severity of taxes can make the price different. If there is a risk, the freight will increase, the tax will be heavy and the price will be high. If the two are added together, how can the price not be expensive?
Furthermore, changes in personnel will also have a big impact on the price of sharks. If the government issues an executive order setting a ban on fishing, or restricting the amount of fishing, the amount of sharks will be small in the city, and the price will rise. On the contrary, if the ban is relaxed, so that the fishing will be unlimited, although the price may drop for a while, it will grow from a distance, and the number of sharks will gradually become thin, eventually causing the price to rise again. Also, the conspiracy of merchants, or the merger to fix the price, or the competition to pour out the enemy, can make the price of sharks, high or low, fickle. < Br >
is based on the market price of a shark, which depends on the weather, geographical location, and personnel. It depends on each other and is intertwined. It is higher and lower, and it cannot be determined by a single word. It is necessary to observe the changes in all things in detail before we can get a glimpse of it.

It is also a tool for making fire in the sun. And when it comes to the storage conditions of armor sharks, there are many details.
The nature of armor sharks likes yin and dampness, so the storage place should be selected in a secluded, dry and well-ventilated place. If placed in a dry place, armor sharks are prone to lose their moisture, causing their qualitative change and losing their original effect.
The temperature of the ground should also be paid attention to. It should not be too high, high temperature is easy to cause armor sharks to rot; nor too low, low temperature may cause them to freeze. It is generally maintained at a moderate temperature, about the normal temperature of the human world.
Furthermore, armor sharks should be stored alone and should not be mixed with other things. Because of the unique nature of armor sharks, if they coexist with other things, they may affect each other and damage their quality. And the storage utensils should be made of clean and solid materials, such as pottery urns, wooden boxes, etc., to protect their integrity and prevent them from being disturbed by the outside world.
It needs to be inspected frequently. If the armor sharks are seen to be damp or insect-eaten, they should be disposed of in time. Those who are damp can be placed in a ventilated place to dry slowly; in case of insect-eaten, they need to be carefully selected to remove their insect filth, so as to protect the integrity of the armor sharks. In this way, the armor sharks can be properly stored and not lost for a long time.