The composition of oxygen, what is the chemical composition of oxygen

Oxygen is a kind of elemental formed by oxygen, the chemical formula O2, its chemical properties are relatively active, and most elements can react with oxygen. It is not very active at room temperature, and it is not easy to interact with many substances. However, it is very active at high temperatures and can be directly combined with a variety of elements, which is related to the electronegativity of oxygen atoms second only to fluorine.

Chemical formula: , colorless and odorless gas, the most common elemental form of oxygen. Melting point, boiling point -183 .

Not easily soluble in water, about 30ml of oxygen is dissolved in 1L of water. Oxygen accounts for about 21% of the air. Liquid oxygen is sky blue.

Oxygenation is a blue crystal.

Oxygen is the most widely distributed in nature, covering the mass of the crust, and is the most abundant element. Oxygen is needed for the oxidation of hydrocarbons, the treatment of wastewater, rocket propellants, and the respiration of animals and humans in aviation, aerospace and diving. Animal respiration, combustion, and all oxidation processes, including the decay of organic matter, consume oxygen.

But the oxygen in the air is constantly replenished by the photosynthesis of plants. In the cutting and welding of metal. It is the mixing of pure oxygen with combustible gas (such as acetylene) to produce a flame at extremely high temperatures, which melts the metal.

Metallurgical processes are inseparable from oxygen. Oxygen is also needed to intensify the production process of nitric acid and sulphuric acid. Gas with a mixture of oxygen and water vapor is blown into a gas gasifier without air to obtain gas with high calorific value.

Medical gas is extremely important.

Oxygen is chemically more reactive. With the exception of rare gases and less reactive metal elements such as gold, platinum, and silver, most of the elements can react with oxygen, and these reactions are called oxidation reactions, and the compounds produced by the reactions (composed of two elements, one of which is oxygen) are called oxides. In general, aqueous solutions of non-metallic oxides are acidic, while alkali metals or alkaline earth metal oxides are alkaline.

In addition, almost all organic compounds can be violently burned in oxygen to form carbon dioxide and water. In chemistry, the chemical reaction between a substance and oxygen was defined as an oxidation reaction, and a redox reaction refers to a reaction in which electrons are transferred or shifted. Oxygen is flammable, oxidizing.

The chemical formula of oxygen is O2It is formed by the combination of two oxygen atoms. Its relative molecular mass is 32

It is the largest gas in the air. occupies 21% of the air. Oxygen is a highly reactive non-metallic element.

It has strong oxidizing properties. It is very easy to react chemically with other elements. It is a necessity for many chemical reactions and life activities.

Oxygen in nature** includes oxygen in the atmosphere. and oxygen produced through photosynthesis in plants and oceans. Oxygen has a wide range of applications.

It is mainly used in many industries such as medical, industrial reputation, metallurgy, and environmental section foundation protection. For example. In the medical field.

Oxygen can be used for a variety of diseases and vital signs that support patients; In the industrial sector. Oxygen can be used in a variety of applications such as combustion, oxidation, construction, and more. Improve production efficiency and product quality.

Oxygen is a chemical element. It is denoted as o in the chemical symbol. It is a colorless, tasteless and odorless gas at room temperature.

Oxygen is one of the most important components of air. It is also one of the gases necessary to maintain the earth's ecosystem. <>

You're probably asking about the composition of industrial oxygen.

Industrial oxygen generally only requires oxygen purity, no special requirements for other sanitary conditions, at the same time, it also contains excessive carbon monoxide, methane and other harmful gases, moisture, bacteria and dust content is also very high, industrial oxygen is mainly used for welding, gas welding, gas cutting, etc.

There is also medical oxygen.

Medical oxygen is oxygen for clinical use, commonly known as dry oxygen, which is mainly used to prevent hypoxia in patients, such as respiratory muscle paralysis, drowning, shock caused by carbon monoxide, etc. Medical oxygen has high purity, colorless, tasteless, and few harmful impurities, and is a special circulation commodity. In 1988, the State Bureau of Technical Supervision promulgated the national mandatory standard for medical oxygen.

But medical oxygen is not just a commodity, it's a medicine. The 2005 edition of the Chinese Pharmacopoeia stipulates the mandatory national standards for medical oxygen, and the gaseous and liquid oxygen prepared by the low-temperature method (also called cryogenic method) to separate the air is the object to determine the test items, including oxygen content, moisture content, carbon dioxide content, carbon monoxide content, gaseous acidic substances and alkaline substance content, ozone and other gaseous oxides, odors, etc., the oxygen content is not less, and at the same time, carbon monoxide, carbon dioxide and other harmful gases and impurities must be filtered in the production process.

Physical properties of oxygen:Under normal conditions, oxygen is a colorless, odorless gas that is not easily soluble in water. Under standard conditions, oxygen is slightly denser than air, and at a pressure of 101 kPa, oxygen becomes a light blue liquid at 183 and a light blue snowflake-like solid at 218.

Chemical properties of oxygen:Oxygen is a chemically reactive gas, which generally does not react with other substances at room temperature, and reacts with many substances under the condition of ignition fire heating to release heat.

The main uses of oxygen

1. Smelting process.

In the process of steelmaking, high-purity oxygen is blown, and the oxygen reacts with carbon and phosphorus, sulfur, silicon, etc., which not only reduces the carbon content of the steel, but also helps to remove impurities such as phosphorus, sulfur and silicon. Moreover, the heat generated during the oxidation process is sufficient to maintain the temperature required for the steelmaking process.

2. Chemical industry.

In the production of synthetic ammonia, oxygen is mainly used for the oxidation of raw gas to strengthen the process and increase fertilizer production. Another example is the high-temperature cracking of heavy oil and the gasification of pulverized coal.

3. National defense industry.

Liquid oxygen is the best accelerant for modern rockets, and liquid oxygen is also needed as an oxidant in supersonic aircraft.

4. Health care.

Breathing: When used in hypoxic, hypoxic or anaerobic environments, such as diving operations, mountaineering, high-altitude flight, astronautics, medical rescue, etc.

The above content reference: Encyclopedia - Oxygen.

Categories: Education Academic Exams.

Analysis: Oxygen.

Oxygen is one of the components of air and is colorless, odorless, and tasteless. Oxygen is heavier than air, has a density of grams in the standard condition (0 and atmospheric pressure 101325 Pa), and is soluble in water, but with very little solubility.

Oxygen can be directly combined with many elements to form oxides.

Oxygen is a gas necessary for combustion and respiration of animals and plants, oxygen-rich air is used for medical treatment and high-altitude flight, pure oxygen is used in steelmaking and cutting and welding metals, and liquid oxygen is used as an oxidizer for rocket engines.

The oxygen used in production is obtained by fractionation of liquid air. Oxygen is produced by thermal decomposition of oxygenated salts (potassium chlorate, potassium permanganate, etc.).