Base oxygen. General characteristics of oxygen and its combustion reaction

He was one of those who are called “ministers of power,” holding successively the positions of Minister of Internal Affairs and Chairman of the KGB. But the system did not tolerate him for long: Vadim Viktorovich Bakatin occupied both chairs for two and a half years. Then he ran for president of Russia, but, like the other candidates (of which we note the “crying Bolshevik” Ryzhkov), he lost to Yeltsin. Having flashed like a comet on the political horizon of Russia, Bakatin nevertheless left a good memory of himself: smart, intelligent, self-possessed and simply humanly sympathetic. It was this long-standing sympathy of mine for Vadim Viktorovich that served as the basis for calling and requesting a meeting.


- Vadim Viktorovich, please tell us a little about yourself, your family, and your career.

You can consider me a child of industrialization. Born in 1937 in Kuzbass, in the village of a mine under construction. Both the Siberian father, a mining surveyor, and the Kaluga mother, a surgeon, were sent to this construction. I myself, having graduated from Sibstrin in 1960, became a builder and worked in Kuzbass. In my opinion, this is the best of professions. The party work to which I was sent in 1973 was also related to construction.

- When Gorbachev invited you to Moscow (how, by the way, was that?), what feelings did you experience? What kind of person did he seem to you then?

The first time I was invited to Moscow was not Gorbachev, but Ligachev. This was in 1983 under Andropov. I worked as an inspector of the Central Committee and had to be ready at any time to go to any place where the party sent me. In March 1985, the party represented by M.S. Gorbachev (this was our first meeting) sent me to the Kirov region. It was good time, and all of us, inspectors of the Central Committee (and this is a lot now famous names), they assessed Gorbachev almost enthusiastically. He was not like the usual general secretary: he liberated the staff, made them think, allowed them to argue and disagree with him. Another thing is that, as it turned out later, while listening, he did not always hear. And all of us were not smart enough to understand the danger of an easy, “Bolshevik” approach to the absolutely necessary perestroika.

- Were you not embarrassed then by the fact that by becoming Minister of the Interior, you were plunging into the abyss? I mean the crimes, the punishment system, the tears of the victims?

I did not plunge into this abyss. The work of the police - necessary, useful to society - was very interesting to me. Unfortunately, we don’t understand it well, but it has a great humanistic component, or, let’s say, potential. Gorbachev did not say anything specific when making the appointment, he only noted that he did not need a policeman, but a politician, and promised support. He understood what not everyone understands today: the police (prosecutor's office, court, etc.) alone will never cope with crime. Both the state and society must fight it.

- Did you have to fire someone, demote someone, that is, show toughness? Are you generally a hard or soft person?

Yes, of course I had to. Whether I am hard or soft depends on the circumstances. When you have to be tough, tough.

- Well, now about the KGB. How did you feel when you first walked into that building? Whose office were you in?

I didn't feel anything. Remember that situation: yesterday the putsch failed, the personnel were completely demoralized. Crowds of far from democrats rushed into the building, shook the monuments, and “threw” information from all sides... The work immediately overwhelmed us. Whose office was he in? Of course, the chairman (Ezhov, Beria, Andropov? - V.N.).

- I think you said then: “I came to destroy this organization.” Looking back, do you think this statement was naive? After all, revenge did not take long to arrive, did it?

These are words from my book. They are often remembered today by the so-called “patriots”. But they, and not only them, probably didn’t read the book. Because the main task was to get rid of the KGB as the “shield and sword” of the party, as the party secret police of the party state, but to preserve and reform the intelligence services as such, adapting them to completely new, “post-coup” conditions of the new union (!) non-totalitarian states. The most great difficulty arose from Russian leadership. After all, the RSFSR never had its own KGB; it had to be created on the basis of the union one, but in such a way as to preserve the structures that perform the main functions. Formally, organizationally, this work was carried out in a very a short time. The system did not work only because Gorbachev interfered with someone, and for this they decided to end the Union. Looking back, I can say that the structure of the special services based on the old KGB for the new, democratic Union was created correctly. And the fact that all these years the yellow newspapers have been hounding me - what can you do? They get paid for this. Everything I did, I always did openly - I didn’t hide and I’m not going to run anywhere. If someone is guilty of something, there is a prosecutor. All the lies about the allegedly given secret of listening devices are not worth a penny. This “secret” has not been a secret since 1982, but was one of the hushed up failures of the KGB. I have nothing to do with this.

- It is known, Vadim Viktorovich, that your grandfather was shot by the “Chekists”. Have you tried to find out how this tragedy happened?

My grandfather, a teacher, worked at an elevator as an accountant in 1936. Early in the morning I went fishing. Grandma fried the fish and went to work at school. I arrived - the frying pan with the fish was barely started, my grandfather was not there. So they took it straight from the table. And he sank into oblivion. Nobody ever saw him again.

I leafed through his “case”: an ordinary binder, gray covers. And the accusation is usual: English and Japanese spy, participant in a monarchist conspiracy led by Prince Volkonsky. Each answer was an exact copy of the interrogation question:

Do you plead guilty to creating a terrorist organization?

Yes, I plead guilty to creating a terrorist organization.

Do you admit that you wanted to blow up the elevator?

Yes, I admit that I wanted to blow up the elevator, etc...

And under each interrogation sheet there is a signature. Moreover, my grandfather had calligraphic handwriting; The signatures I saw under the interrogation sheets did not resemble anything: they ran like a cockroach. On July 27, he was arrested, and on August 27, 1937, he was shot.

It is now recognized that he, like millions of others, was shot simply “for the count.”

- At the same time, you said that you were against the dissolution of the KGB...

The fate of millions of innocent people killed by the previous regime has nothing to do with the question of whether or not to maintain the special services in the country after August 1991. There could be only one answer: save. We are not Lithuania, not the Czech Republic, or even the GDR. The Union, even weakened by the coup, remained great nuclear power, with the most powerful military-industrial complex and many other things that should have been reliably protected from, let’s say, outside interest. But we did not and could not have any other special services except the KGB.

The task was to retain professionals and de-ideologize the KGB. But for this you need political will society and the state, and not the KGB itself, in which they worked very different people. needed differentiated approach, and not indiscriminate acceleration. De-ideologization was supposed to be a process over many years, and not a one-time act. And it cannot occur in isolation from the formation of a new social consciousness. No matter how the state flirts with the “siloviki”, the dominant sentiments among them will still be the sentiments of society.

- As far as I know, Elena Georgievna Bonner was in Lubyanka - she was looking for the case of her executed father and the case of Andrei Dmitrievich Sakharov. Was this with you?

Yes, I remember it well. I must say that they simply lied to me: they say that the Sakharov case did not exist and does not exist. I had to fire a boss who lied. There was a Sakharov case, but he was burned - there is a corresponding act about this. Something, of course, was destroyed without any registration, so, unfortunately, there were no traces left. Then, however, they found some materials concerning Andrei Dmitrievich, it seems, the manuscript of his books, Solzhenitsyn’s letters were found. Why hide something that doesn't need to be hidden?

- Do you remember in “The Gulag Archipelago” Solzhenitsyn’s phrase about the stairs in the internal prison on Lubyanka, with chipped steps along which thousands passed, including Tukhachevsky and Bukharin? Were you in that prison?

No wasn `t. You can, with a little imagination, imagine what those walls saw and heard. There, in Lubyanka, we need to create a museum - and this is not just my opinion. In the very first days, I heard this idea from the officers who work there.

- Why did you end up out of work - first in the Ministry of Internal Affairs, then in the KGB?

The KGB and the Ministry of Internal Affairs absolutely different organizations. The Union was gone. There was no longer any need for the Inter-Republican Security Service, much less its chief. And Gorbachev removed me from the Ministry of Internal Affairs. As he invited, he exhibited. After all, not only today in Russia, but also earlier in the Union, intrigues, whispers, and media campaigns had great importance in "personnel work". For the sake of objectivity, it must be said that after Belovezhskaya Pushcha Yeltsin invited me and asked where I wanted to work. I answered him: “Just yesterday I worked in Gorbachev’s team and I cannot jump from orbit to orbit: give me time.” This conversation took place in December 1991. Since then, Boris Nikolaevich and I have not met.

- What have you been doing since then? After all, almost 6 years have passed!

He worked at the Reform Foundation of Academician Shatalin. It was wonderful person. He died. I couldn’t work at the foundation without him and left.

The Reform Foundation was one of the emerging institutions civil society. Now, in my opinion, the process of formation of civil society in Russia has slowed down. Democracy is impossible without a developed civil society. But even more so, it is impossible without a developed, dynamic market economy. In a poor country, democracy is a utopia. I still believe that our failures and misfortunes are due to the fact that we ruined the economy. They didn’t reform, they destroyed it. Until the government starts increasing production, nothing will happen! So he will look for someone to borrow from, someone to take away from, in order to feed pensioners, the army, etc...

Where can I find it if production is at a standstill?

- Let's go back a little. Did your defeat in the presidential election upset you a lot? Or did you understand that Yeltsin is stronger than everyone? Do you think Russia needs an intellectual president?

I have long forgotten about those elections. Of course, Boris Nikolayevich Yeltsin was then the strongest of all. Russia does not need an intellectual leader, but an intelligent leader.

- You left the Shatalin Foundation and are now out of work. It seems to me that you could very well become a State Duma deputy.

- “Becoming” a State Duma deputy is not so easy and not so cheap.

- You specially came from out of town to Moscow to say goodbye to Bulat Okudzhava. What place do poetry, music, theater occupy in your life?

Okudzhava’s songs are my youth, and I was saying goodbye to my youth. But in me Okudzhava will never die. I loved his songs from the first moment I heard them. His songs, his philosophy have their place in my life, and nothing can replace them. And poetry and music, but, to my deep regret, not theater, occupy in my life great place. Big, but not the main thing. (In Vadim Viktorovich’s office, I saw a painting on an easel. He paints himself, and his grandfather with maternal side was a professional artist. - V.N.).

- Okudzhava has a paradoxical line: “Let the one striving for power dominate to his heart’s content.” How do you, a person who held great power in your hands, understand this line of the poet?

I understand the poet’s irony not at all as political advice. There are many who are striving for power and who should not be given it under any circumstances; God forbid that some Dzhugashvili grabs her again. Many do not stand the test of power, including the current one. Russian authorities. She often forgets why she exists: she serves herself; power for power's sake. But if the power is for the benefit of the people, it’s a different caliber. Recently the rector of the Kirov Medical Institute called me - I found him through the cosmonauts - and invited me to the 10th anniversary of the institute. Of course, they exaggerate my importance, but, on the other hand, I don’t want to be so falsely modest: I went about the medical institute, pushed for it, and achieved it. And now, thank God, the institute has become established and established: it was done for the sake of the people, they remember - and it’s nice, no matter what you say. And here you can’t talk about wasted power. And in 1985, purely “voluntarily” I opened the Vasnetsov house-museum in Kirov. I, who had just “received” the region - the first secretary of the regional committee, was asked: “What do you want?” And I answered: “House-museum.”

- So it was populism in favor of the intelligentsia?

You can call it that if you like. Here, in Moscow, I don’t feel the intelligentsia. They show on TV some parties, kisses, awards, 50th anniversaries and so on. In Kirov, the intelligentsia is truly a community of like-minded people: teachers, doctors, poets. And what artists there are! When I saw 15 thousand paintings hanging in storage rooms like sheep skins - one after another, I responded to the request of the intelligentsia to build a museum. And he went to the State Planning Committee and opened a title for construction. The Minister of Culture, who came to the opening of the museum, noted that this is the only museum built in the post-stagnation years.

- I asked you about your family, but for some reason you only talked about your parents and their parents.

I have two sons and three daughters-in-law - younger son divorced. The children have adapted to this life better than me. The younger one graduated from the Law Faculty of Moscow State University and works in a bank. And the older one was less fortunate, perhaps: he followed in my footsteps, becoming a builder, then worked in the KGB - even before I came there. And the first thing I did, taking advantage of my official position, was to fire him from the KGB, because he had filed a report long ago, but they didn’t want to fire him. Now it is more or less settled.

- Do you think politics is compatible with morality?

Of course it is compatible. If a person is honest, if he has a conscience, some moral brakes, then his morality does not depend on his place of work. One can also ask: is trade or journalism compatible with morality? How do you think?

1936 - July 27. Grandfather, teacher, accountant at the elevator. Arrested 1937 - August 27. Grandfather, teacher, accountant at the elevator. Shot as an English and Japanese spy who planned to blow up a grain elevator 1937 - November 06. Kemerovo region. Kiselevsk. Was born. Father - mining surveyor , Siberian. Mother is a surgeon, born in Kaluga in the family of an artist 1960 - Kuzbass. Siberian construction institute(Sibstrin). Builder's diploma and the beginning of a construction career. Master 1961 - Foreman 1962 - Trest "Kemerovokhimstroy". SMU No. 1. Head of the section 1963 - Trest "Kemerovokhimstroy". SMU No. 3. Chief engineer 1964 - Member of the CPSU 1965 - July 01. The youngest son Dmitry was born 1969 - Trest "Kemerovokhimstroy". SMU No. 4. Head 1971 - Kemerovo. House-building plant (DSK). Chief Engineer 1972 - Order of the Badge of Honor 1973 - Kemerovo. City Committee of the CPSU. 2nd Secretary 1975 - Kemerovo. Regional Committee of the CPSU. Construction department. Manager 1977 - Kemerovo. Regional Committee of the CPSU. Secretary 1982 - Moscow. New building of the US Embassy. Discoveredlistening devices. A loud and lengthy spy scandal began 1983 - Ligachev E.K. invited me to Moscow. Instructor of the CPSU Central Committee 1983 - Academy social sciences under the Central Committee of the CPSU. Listener 1985 - Academy of Social Sciences under the CPSU Central Committee. Certificate of completion 1985 - March. First meeting with Gorbachev M.S. 1985 - March. Directed to the Kirov region as the First Secretary of the Regional Committee of the CPSU."It's better to die from nicotine than from Ba-ka-tin" 1985 - Kirov. The Vasnetsov house-museum opened 1986 - Member of the CPSU Central Committee. Deputy of the Supreme Soviet of the USSR 1987 - Awarded the Order of Lenin 1987 - Kemerovo. Regional Committee of the CPSU. First Secretary 1988 - Delegate to the 19th CPSU Conference , who set a course for Perestroika 1988 - Gorbachev M.S.Appointed Minister of Internal Affairs of the USSR, noting: “I don’t need a policeman, but a politician.” 1988 - Rank of police lieutenant general 1990 - March. Member of the Presidential Council 1990 - Ministry of Internal Affairs of the USSR. Resignation from the post of Minister.Gorbachev M.S. "As he invited, so he exhibited" 1991 - Moscow State University. Faculty of Law. Son Dmitry received a diploma and went to graduate school 1991 - June. Candidate for President of Russia, competitor YeltsinB.N. Received only 3.5% of the votes 1991 - March. HMember of the Security Council under the President of the USSR 1991 - August. An active opponent of the State Emergency Committee. Flew to Foros for Gorbachev 1991 - August 23. Chairman of the KGB of the USSR.Author of the term "Chekism".Advisor to the Chairman - Oleg Danilovich Kalugin 1991 - September.Chairman of the KGB of the USSR Bakatin signed the Conclusion on the State Emergency Committee case 1991 - October. The KGB of the USSR was abolished 1991 - November. Head of the Inter-Republican Security Service 1991 - December. Personally handed over to US Ambassador Robert Straus the plans for placing listening devices in the new building of the American Embassy in Moscow 1991 - December 19. By Yeltsin's decree, the Interrepublican Security Service was abolished 1991 - December 23. Meeting with Yeltsin. Resigned from the post of ambassador to the United States and went on vacation for three weeks 1991 - Book "Deliverance from the KGB" , Moscow publishing house "Novosti" 1991 - December 25. The USSR ceased to exist 1992 - International Fundeconomic and social reforms "Reform".Shatalin, Abalkin, Petrakov... 1992 - Knig and “Liberation from illusions” (the view of the USSR Minister of Internal Affairs on the events of 1989-1990) 1992 - Autumn. International Foundationeconomic and social reforms " Reform ". Meeting Fateh Vergasov 1994 - Alexander Nikolaevich Yakovlev invited toOrganizing Committee of the "Democratic Movement for the Creation of a United Social Democratic Party of Russia" 1993 - Moscow State University. Son Dmitry, candidate legal sciences, teacher 1994 - September 21. Supported Yeltsin's Decree to storm the White House in Moscow 1995 - Group "MFC Renaissance". Son Dmitry -managing director 1997 - Death of Bulat Okudzhava. Participant in farewell to the poet 1997 - Son Dmitry -Member of the Board of Directors of OJSC "Novolipetsk Iron and Steel Works" 1997 - Son Dmitry - member of the board of directors OJSC "Novoship" (Novorossiysk Shipping Company) 1999 - Book "The Road in the Past Tense". (from the Ministry of Internal Affairs and the KGB to the CIS), publishing house Dom, ISBN: 5-85201-349-8 2001 - Son Dmitry - First Deputy general director OJSC "Gazprom-Media" 2002 - Baring Vostok Capital Partners. Member of the Advisory Council 2003 - Son Dmitry - doctor economic sciences Wife - Lyudmila Antonovna
Children: sons Alexander and Dmitry
- I have two sons and three daughters-in-law - the youngest son got divorced. The children have adapted to this life better than me. The younger one graduated from the Law Faculty of Moscow State University and works in a bank. And the eldest was less fortunate, perhaps: he followed in my footsteps, becoming a builder, then worked in the KGB - even before I came there. And the first thing I did, taking advantage of my official position, was to fire him from the KGB, because he had filed a report long ago, but they didn’t want to fire him.

Oxygen is the most abundant chemical element on the planet. His mass fraction V earth's crust is 47.3%, volume fraction in the atmosphere - 20.95%, and the mass fraction in living organisms - about 65%. What is this gas, and what physical and chemical properties does oxygen have?

Oxygen: general information

Oxygen is a non-metal normal conditions colorless, tasteless and odorless.

Rice. 1. Formula of oxygen.

In almost all compounds, except compounds with fluorine and peroxides, it exhibits a constant valence of II and an oxidation state of -2. The oxygen atom does not have excited states, since on the second external level there are no free orbitals. As a simple substance, oxygen exists in the form of two allotropic modifications– oxygen gases O 2 and ozone O 3 .

Under certain conditions, oxygen can be in a liquid or solid state. They, unlike gas, have a color: liquid - light blue color, and solid oxygen has a light blue tint.

Rice. 2. Solid oxygen.

Oxygen in industry is obtained by liquefying air with subsequent separation of nitrogen due to its evaporation (there is a difference in boiling points: -183 degrees for liquid oxygen and -196 degrees for liquid nitrogen).

Chemical properties of oxygen interaction

Oxygen is an active non-metal. Oxygen is capable of reacting with all elements except neon, helium and argon. Usually the reactions of this gas with other substances are exothermic. The process of oxidation, which occurs with the simultaneous release of energy in the form of heat and light, is called combustion. Very important to use organic compounds, in particular, alkanes, as fuel, since during the free radical combustion reaction it is released a large number of heat:

CH 4 +2O 2 = CO 2 +2H 2 O +880 kJ.

Oxygen usually reacts with nonmetals when heated, forming an oxide. Thus, the reaction with nitrogen begins only at temperatures above 1200 degrees or in an electrical discharge:

Oxygen also reacts with metals:

3Fe + 2O 2 = Fe 3 O 4 (as a result of the reaction, a compound is formed - iron oxide)

In nature, there is an even stronger oxidizing agent than oxygen, it is ozone. It is capable of oxidizing gold and platinum. Under natural conditions, ozone is formed from atmospheric oxygen during lightning discharges, and in the laboratory - by transmission electrical discharge through oxygen: 3O 2 = 2O 3 – 285 kJ (endothermic reaction)

Rice. 3. Ozone.

The most significant oxygen compound is water. About 71% earth's surface takes water shell. The corner water molecules are polar, each of them forms four hydrogen bonds: two as a proton donor and two as a proton acceptor. Associates (H 2 O)x are formed, where x varies from 2 to 5. Dimers of (H 2 O)2 are present in water vapor, and in condensed phases a water molecule can be in a tetrahedral environment of four other molecules. if water molecules were not associated, then its boiling point would not be 100 degrees, but about 80 degrees.. Total ratings received: 104.

Oxygen - element main subgroup sixth group, second period of the periodic table of chemical elements, with atomic number 8. Indicated by the symbol O (lat. Oxygenium). Oxygen is a chemically active non-metal and is the lightest element from the group of chalcogens. The simple substance oxygen (CAS number: 7782-44-7) under normal conditions is a colorless, tasteless and odorless gas, the molecule of which consists of two oxygen atoms (formula O 2), and therefore it is also called dioxygen. Liquid oxygen has a light blue color, and solid oxygen is light-blue crystals. of blue color.
There are others allotropic forms oxygen, for example, ozone (CAS number: 10028-15-6) - under normal conditions, a blue gas with a specific odor, the molecule of which consists of three oxygen atoms (formula O 3).

History of discovery

It is officially believed that oxygen was discovered by the English chemist Joseph Priestley on August 1, 1774 by decomposing mercuric oxide in a hermetically sealed vessel (Priestley directed towards this compound Sun rays using a powerful lens).
2HgO (t) → 2Hg + O 2

However, Priestley initially did not realize that he had discovered a new simple substance; he believed that he had isolated one of components air (and called this gas “dephlogisticated air”). Priestley reported his discovery to the outstanding French chemist Antoine Lavoisier. In 1775, A. Lavoisier established that oxygen is integral part air, acids and is found in many substances.
A few years earlier (in 1771), oxygen was obtained by the Swedish chemist Karl Scheele. He calcined saltpeter with sulfuric acid and then decomposed the resulting nitric oxide. Scheele called this gas “fire air” and described his discovery in a book published in 1777 (precisely because the book was published later than Priestley announced his discovery, the latter is considered the discoverer of oxygen). Scheele also reported his experience to Lavoisier.
An important stage that contributed to the discovery of oxygen was the work French chemist Peter Bayen, who published work on the oxidation of mercury and the subsequent decomposition of its oxide.
Finally, A. Lavoisier finally figured out the nature of the resulting gas, using information from Priestley and Scheele. His work was of enormous importance because thanks to it, the phlogiston theory, which was dominant at that time and hampered the development of chemistry, was overthrown. Lavoisier conducted a combustion experiment various substances and disproved the phlogiston theory by publishing results on the weight of burned elements. The weight of the ash exceeded the original weight of the element, which gave Lavoisier the right to claim that during combustion chemical reaction(oxidation) of a substance, in connection with this mass starting material increases, which refutes the phlogiston theory.
Thus, the credit for the discovery of oxygen is actually shared between Priestley, Scheele and Lavoisier.

origin of name

The word oxygen (called in early XIX century, even “acid solution”), its appearance in the Russian language is to some extent due to M.V. Lomonosov, who introduced the word “acid” into use, along with other neologisms; Thus, the word “oxygen”, in turn, was a tracing of the term “oxygen” (French oxygène), proposed by A. Lavoisier (from ancient Greek ὀξύς - “sour” and γεννάω - “giving birth”), which is translated as “generating acid”, which is associated with its original meaning - “acid”, which previously meant oxides, called according to modern international nomenclature oxides.

Receipt

Currently, in industry, oxygen is obtained from the air. Main industrially oxygen production is cryogenic rectification. Oxygen plants operating on the basis of membrane technology are also well known and successfully used in industry.
Oxygen is used in laboratories industrial production, supplied in steel cylinders under a pressure of about 15 MPa.
Small amounts of oxygen can be obtained by heating potassium permanganate KMnO 4:
2KMnO 4 → K 2 MnO 4 + MnO 2 + O 2

The catalytic decomposition reaction of hydrogen peroxide H2O2 is also used:
2H 2 O 2 → 2H 2 O + O 2

The catalyst is manganese dioxide (MnO 2) or a piece of raw vegetables (they contain enzymes that accelerate the decomposition of hydrogen peroxide).
Oxygen can be obtained by the catalytic decomposition of potassium chlorate ( bertholet salt) KClO 3:
2KClO 3 → 2KCl + 3O 2

Laboratory methods for producing oxygen include the method of electrolysis of aqueous solutions of alkalis.

Physical properties

Under normal conditions, oxygen is a gas without color, taste or smell.
1 liter of it has a mass of 1.429 g. Slightly heavier than air. Slightly soluble in water (4.9 ml/100g at 0 °C, 2.09 ml/100g at 50 °C) and alcohol (2.78 ml/100g at 25 °C). It dissolves well in molten silver (22 volumes of O 2 in 1 volume of Ag at 961 °C). Is paramagnetic.
When heated oxygen gas its reversible dissociation into atoms occurs: at 2000 °C - 0.03%, at 2600 °C - 1%, 4000 °C - 59%, 6000 °C - 99.5%.
Liquid oxygen (boiling point −182.98 °C) is a pale blue liquid.
Solid oxygen (melting point −218.79 °C) - blue crystals.

Oxygen atoms can form two types of molecules: O 2 - oxygen and O 3 - ozone.

The phenomenon of the existence of several simple substances, formed by atoms one chemical element is called alotropy. A simple substances, formed by one element, are called alotropic modifications.

Therefore, ozone and oxygen are allotropic modifications element Oxygen.

Properties

Oxygen

Ozone

Compound formula

O2

O 3

Appearance under normal conditions

Gas

Gas

Color

Oxygen in vapor is colorless. Liquid is pale blue and solid is blue

Ozone vapor is light blue.

The liquid is blue, and the solid is dark purple crystals.

Smell and taste

Odorless and tasteless

Pungent characteristic odor (in small concentrations gives the air a fresh smell)

Melting temperature

219 °C

192 °C

Boiling temperature

183 °C

112 °C

Density at n. u.

1.43 g/l

2.14 g/l

Solubility

4 volumes of oxygen in 100 volumes of water

45 volumes of ozone in 100 volumes of water

Magnetic properties

Liquid and solid oxygen are paramagnetic substances, i.e. are drawn into a magnetic field It has diamagnetic properties, that is, it does not interact with

magnetic field

Biological role Necessary for the respiration of plants and animals (mixed with nitrogen or inert gas ). Inhalation pure oxygen

leads to severe poisoning In the atmosphere it forms the so-called ozone layer , which protects the biosphere from harmful effects

ultraviolet radiation. Poisonous

Chemical properties of oxygen and ozone

Interaction of oxygen with metals

However, when some metals burn, they form not oxides, but peroxides (in such compounds the oxidation state of Oxygen is -1) or superoxides (the oxidation state of the Oxygen atom is fractional). Examples of such metals are barium, sodium and potassium:

Interaction of oxygen with nonmetals

Oxygen exhibits an oxidation state of -2 in compounds that are formed with all nonmetals except Fluorine, Helium, Neon and Argon. When heated, oxygen molecules directly interact with all non-metals, except halogens and inert gases. In an oxygen atmosphere, phosphorus and some other non-metals spontaneously ignite:

When oxygen interacts with fluorine, oxygen fluoride is formed, and not fluorine oxide, since the Fluorine atom has a higher electronegativity than the Oxygen atom. Oxygen fluoride is a pale yellow gas. It is used as very strongoxidizing agent and fluorovalent agent. In this compound, the oxidation state of Oxygen is +2.

In an excess of fluorine, dioxygen difluoride can be formed, in which the oxidation state of Oxygen is +1. The structure of such a molecule is similar to the hydrogen peroxide molecule.

Application of oxygen and ozone. Meaning ozone layer

Oxygen is used by all aerobic living things for respiration. During photosynthesis, plants release oxygen and absorb carbon dioxide.

Molecular oxygen is used for so-called intensification, that is, acceleration of oxidative processes in the metallurgical industry. Oxygen is also used to create a flame with high temperature. When acetylene (C 2 H 2) burns in oxygen, the flame temperature reaches 3500 ° C. In medicine, oxygen is used to facilitate the breathing of patients. It is also used in breathing apparatus for people working in difficult-to-breathe atmospheres. Liquid oxygen is used as a rocket fuel oxidizer.

Ozone is used in laboratory practice as a very strong oxidizing agent. In industry, it is used to disinfect water, since it has a strong oxidizing effect that destroys various microorganisms.

Peroxides, superoxides and ozonides alkali metals used for oxygen regeneration in spacecraft and on submarines, This application is based on the reaction of these substances with carbon dioxide CO 2:

In nature, ozone is found in high layers of the atmosphere at an altitude of about 20-25 km, in the so-called ozone layer, which protects the Earth from harsh solar radiation. A decrease in ozone concentration in the stratosphere by at least 1 can lead to severe consequences, such as an increase in the number of skin cancers in humans and animals, an increase in the number of diseases associated with suppression of the human immune system, slower growth land plants, reduction in the growth rate of phytoplankton, etc.

Without the ozone layer, life on the planet would be impossible. Meanwhile, atmospheric pollution from various industrial emissions leads to the destruction of the ozone layer. The most hazardous substances for ozone are freons (they are used as refrigerants in refrigeration machines, as well as fillers for deodorant cans) and rocket fuel waste.

The world community is very concerned about the formation of a hole in the ozone layer at the poles of our planet, and therefore, in 1987, the Montreal Protocol on Substances that Deplete the Ozone Layer was adopted, which limited the use of substances harmful to the ozone layer.

Physical properties of substances formed by the element Sulfur

Sulfur atoms, as well as Oxygen, can form various allotropic modifications ( S∞; S 12; S 8; S 6; S 2 and others). At room temperature, sulfur is in the formα -sulfur (or rhombic sulfur), which are yellow, brittle crystals, odorless, insoluble in water. At temperatures above +96 °C a slow transition occursα-sulfur to β -sulfur (or monoclinic sulfur), which is almost white plates. If molten sulfur is poured into water, the liquid sulfur supercools and a yellow-brown rubber-like substance forms. plastic sulfur, which later turns back into a-sulfur. Sulfur boils at a temperature of +445 ° C, forming dark brown vapors.

All modifications of sulfur are insoluble in water, but dissolve quite well in carbon disulfide(CS 2) and some other non-polar solvents.

Application of sulfur

The main product of the sulfur industry is sulfate acid. Its production accounts for about 60% of the sulfur that is mined. In the gum industry, sulfur is used to convert rubber into high-quality rubber, that is, to vulcanize rubber. Sulfur - essential component any pyrotechnic mixtures. For example, match heads contain about 5%, and the spread on a box contains about 20% sulfur by weight. IN agriculture sulfur is used to control pests in vineyards. In medicine, sulfur is used in the manufacture of various ointments to treat skin diseases.




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