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The structure of the benzene ring has been used by a large number of chemists in history. People speculate, imagine. , but no reasonable answer can be found.

Benzene is highly unsaturated, but it is as stable as alkane. The chemist was puzzled. Kekule is an imaginative and persistent man.

He thought about Ben's structure day and night. One day, he entered a dream as he thought. In the dream, a snake kept circling, and suddenly, this strange snake bit its own tail.

A ring is formed. Kekule was also awakened. He had a sudden inspiration and drew a circular configuration of benzene.

led to the discovery of the structure of benzene. Kekule's dream-like discovery is also said to be a good story in the history of chemistry.

The Mystery of the Daughter Country "Journey to the West" describes the story of Tang Seng and his entourage going west to learn scriptures and passing through the daughter country. The author does not believe that this is the case, and if it is, then how can it be reproduced? Genocide, too, does not exist.

Here the name of "daughter country" is used to illustrate that chemical earth elements do have an impact on the birth of boys and girls. There used to be a village in a certain mountainous area in Guangdong, and all the girls were born in a row in the past few years, and people were anxious. Some people pray to God and Buddha, and they also help.

An old feng shui man said: "The geological team is looking for minerals in Houlong Mountain and destroys the dragon vein, which is the retribution for bad feng shui!" So, the superstitious villagers did everything possible to find the geological team that used to prospect here, and asked them to pay for "feng shui".

The geological team returned to the cottage and conducted an in-depth investigation to finally find the cause. It turned out that during the prospecting, the drilling rig led out the underground beryllium-containing spring water, which diffused the beryllium pollution, greatly increased the beryllium content of drinking water, and drinking this water for a long time led to the birth of a girl instead of a man. After governance, the situation improved, and another boy was born in the "daughter country".

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1.Iodine and fingerprints to solve the case.

In movies, it is often seen that public security officers use fingerprints to solve crimes. Actually, as long as we press our fingers on a blank piece of paper, and then aim the place where the fingers have been pressed on the paper is the mouth of the test tube with a small amount of iodine, and heat the bottom of the test tube with an alcohol lamp. When the sublimated purple iodine vapor in the test tube comes into contact with the paper, the fingerprints that are not normally visible on the paper will gradually be revealed, and a very obvious brown fingerprint can be obtained.

If you hide this blank piece of paper and do the above experiments a few months later, you can still show the fingerprints hidden on the paper. This is because everyone's fingerprints are not exactly the same, and fingers always contain oil, mineral oil, and sweat, among other things. When you put your finger on the top of the paper, the grease, mineral oil, and sweat on the fingerprint will remain on the paper, but the human eye will not be able to see it.

Whereas, pure iodine is a purple-black crystal with a metallic luster. Interestingly, when heated by the vast majority of substances, there are generally three state changes of solid, liquid and gaseous states. Iodine, on the other hand, is unusual, and can be turned into vapor without going through a liquid state when heated.

The phenomenon of direct gasification of solid substances such as iodine is called sublimation. At the same time, iodine also has the property of being easily soluble in organic solvents. Since fingerprints contain organic solvents such as grease and sweat, when iodine vapor rises and encounters these organic solvents, they will dissolve in them, so fingerprints are also displayed.

2.Light and naughty lithium.

Lithium is a soft, silvery-white metal, don't look at its appearance is similar to some metals, and its personality characteristics are not ordinary! First of all, it is exceptionally light, one of the lightest of all metals. Secondly, it is lively by nature and loves to associate with other substances.

For example, if a small piece of lithium is thrown into a glassware and a frosted plug is plugged, the air in the vessel will be quickly depleted by a reaction that will make it a vacuum. As a result, even if you try your best, don't even think about scrubbing.

Explorer in the field of chemistry - Guy 6 1 Lussac.

French physicist, chemist Gai 6 1 Lussac (Gay-Lussac, born.

The town of Saint-6 1 Léonard in the Limoges region of France. His father was a prosecutor at the time, and his family was relatively wealthy.

Guy 6 1 After receiving his primary education in his hometown, Lussac entered the École Technic de Paris. He is passionate about chemistry and.

The experimental technique was deeply appreciated by the famous chemist berthollet of the university.

After graduating in 1880, he became Bertorre's assistant. At that time, Bertore was working with the chemist Pross.

Proust, arguing about the law of definite ratio. The law of definite ratio is Pross 1799

years raised, he thinks"When two or more elements are interacted to form a compound, its weight.

The proportion of quantity is naturally fixed, and manpower cannot be increased or decreased".Bertore was adamantly opposed to this conclusion and demanded that 6 1 Lü be covered.

Sack experiments to prove his point. Cover 6 1 Lussac recorded the events after repeated experiments and analytical studies.

Both the facts and the conclusions obtained proved that Bertolre's objection was wrong. Bertore looked at the experimental knot of Cover 6 1 Lussac.

After that, he suddenly wrinkled his forehead and showed deep disappointment. As a great scientist, truth is always greater than self-esteem.

Even more precious. He thought that it was none other than young people who had just embarked on the path of science.

Cover 6 1 of Lussac. At this moment a smile appeared on Bertore's gloomy face, and he put his hand on the shoulder of Gai 6 1 Lussac.

said:"I'm so proud of you. There is no reason for a talented person like you to be an assistant, even if it is to give.

The greatest scientists as assistants. Your eyes can see the truth, you can see into the mysteries that people don't know, and.

This is not something that everyone can do. You should work independently. From today, you can:

Conduct any experiments you deem necessary. "Bertore forgot about his failure to argue and rejoiced that another great chemist had appeared in the world. He's not anywhere else, but in my Bertore's laboratory!

France will be proud to have this proud son.

Kekule's hypothesis on the structure of benzene ring has made outstanding contributions to the history of organic chemistry. He was trained as an architect in his early years, had a certain ability to think figuratively, he was good at using the model method, and he was good at linking the properties of compounds to the structure, and his painstaking research finally came to fruition, and in the winter of 1864, his scientific inspiration led him to a major breakthrough. He wrote:

I sat down to write my textbook, but the work didn't progress; My mind wandered. I turned my chair to the fire and dozed off. The atom jumped before my eyes again, and the smaller group humbly retreated behind.

My mind has become sharpened by the constant appearance of such hallucinations, and I can now distinguish large structures of many shapes, as well as long rows of molecules that are sometimes close together, whirling and whirling, moving like snakes. See! What is that?

A snake bit its own tail, and the shape swirled illusory in front of my eyes. It was like a flash of lightning, and I woke up. I spent the rest of the night making this assumption.

Thus, for the first time, Kekuler satisfactorily wrote the structural formula of benzene. It is pointed out that the structure of aromatic compounds contains a closed ring of carbon atoms. It differs from aliphatic compounds that have an open-chain structure.

The birth of the benzene ring structure. It was a milestone in the history of organic chemistry in which Kekuler believed that the six carbon atoms in the benzene ring were alternately linked by single and double bonds to keep the carbon atoms tetravalent. In 1866, he drew a spatial model of single and double bonds, which was completely equivalent to modern structural formulas.

When Zhuge Liang released Meng for the fourth time, when the vulture dragon king threatened to use the poisonous spring to eliminate the Han army, one of them was a "dumb spring", the Han general pioneer Wang Ping led people to explore the road because of the hot weather at that time, the people and horses rushed to drink the water of the dumb spring by mistake, and the soldiers could not speak after returning to the camp, and the heavy responsibility was also in danger, Zhuge Liang was also helpless at that time, and the soldiers of the Han army were instructed by a local old man to drink the water of Wan'an Creek Anle Spring to turn the crisis into safety.

Principle: The dumb spring contains a large amount of CuSO4, and people will be poisoned when they drink water containing copper salts, causing slurred speech, vomiting and diarrhea and finally leading to prostration, spasms and death, while Wan'an River Anle Spring Water contains more alkali, of which OH- can be combined with Cu2+ in the dumb spring to precipitate copper hydroxide, which is not easy to be absorbed by the human body, so it will not cause harm to the human body.

Fried cucumbers, you can analyze them using chemical principles.

Nobel developed gunpowder and finally blew himself up;

The story of Mendeleev and gallium metal:

According to the periodic law, Mendeleev also predicted the existence and properties of some elements that had not yet been discovered at that time. His prophecy is strikingly consistent with the results of subsequent practice.

In 1875, the French chemist Boisbeaudrand discovered a new element in the analysis of sphalerite in the Pyrenees, which he named gallium, and published the main properties of gallium that he had measured. Soon after, he received a letter from Mendeleev, in which Mendeleev pointed out that the specific gravity of gallium should not be, but that at that time Boisbodrand was very puzzled, he was the only person who had the metal gallium in his hands, how did Mendeleev know the specific gravity of gallium?

In September 1876, Boisbodran re-examined the experiment and purified the gallium metal, re-measuring it, and he was amazed by the fact that the specific gravity of the grain was indeed of modern value. After carefully reading the periodic law of Menjielieda**, he said with emotion:"I have nothing more to say, and the facts prove the great significance of Mendeleev's theory.

The discovery of gallium was the first pre-predicted discovery of a new element in the history of chemistry, and it eloquently proved the scientific validity of Mendeleev's periodic law.

Scandium was discovered by Nelson in Sweden in 1880, and germanium by Winkler in Germany in 1885. These two new elements are also completely consistent with the boron-like and silicon-like predicted by Mendeleev, and Mendeleev's periodic law has once again been tested by practice.