Briefly talk about the important role of nitrogen and oxygen in the atmosphere.

Oxygen is a substance necessary for human beings and all living beings to maintain life activities, and nitrogen is the basic component of living organisms on earth.

To put it simply, oxygen feeds biological respiration and provides oxidants; Nitrogen is a raw material for biological nitrogen fixation, and it also has a protective effect.

1. The air content is different.

Oxygen and nitrogen are both gases contained in the air, but they are in different amounts. In the air, oxygen accounts for about 21%, while nitrogen accounts for about 21%.

2. The liveliness is different.

Chemical properties of nitrogen.

It is relatively inactive and difficult to react with other substances at room temperature, so it is often used to make preservatives.

or food preservation protective gas. The properties of oxygen are more active at high temperatures, and can be directly combined with a variety of elements to undergo combustion reactions. Except for noble gases.

With the exception of less reactive metallic elements such as gold, platinum, and silver, most of the elements can react with oxygen.

3.Different uses.

The main use of nitrogen is in the synthesis of ammonia. In recent years, people have been trying to understand the mechanism of nitrogen fixation in plants, and strive to use chemical methods to simulate biological nitrogen fixation, so as to experiment with the development and utilization of nitrogen resources in the air under mild conditions.

Oxygen is mainly used to supply respiration: it is used in hypoxia, hypoxic or anaerobic environments, such as diving operations, mountaineering, high-altitude flight, astronautics, medical rescue, etc. It can also be used as an accelerant with acetylene.

Propane and other combustible gases are used together to achieve the effect of welding and cutting metals.

Your problem is self-centered, you have to dilute oxygen to breathe, they inhale carbon dioxide and they emit oxygen, but this question should be thought of this way. And there are many, many species on the planet besides humans. It may be said that oxygen can be used as a solvent to dilute oxygen without affecting people, oxygen is equivalent to exhaust gas, and the role of nitrogen is greater than that of oxygen.

Is it easy to understand, I'm afraid that only nitrogen can do the job, and after the rainwater dissolves, it enters the soil and provides nutrients for the plants, for them.

On the other hand: oxygen is for us animals, or to put it another way, nitrogen provides them with nutrients, and for plants, the nitrogen in the air is broken down by lightning into nitrogen ions that can be stored in water when thunder, and nitrogen is designed for plants: because humans cannot breathe pure oxygen.

Nitrogen oxides (NOx) are compounds composed of only nitrogen and oxygen, including a variety of compounds, such as nitrous oxide (N2O), nitric oxide (NO), nitrogen dioxide (NO2), nitrogen trioxide (N2O3), nitrogen tetroxide (N2O4) and nitrogen pentoxide (N2O5).

What is the oxidation token

Oxide refers to a compound composed of two elements, one of which is the element oxysibi. According to different standards, there are several classifications of oxides, such as metal oxides if another element in the constituent element is a metal element; If it is a non-metal, it is a non-metallic oxide. According to whether salt is formed with water, and the type of salt generated, it can be divided into:

There are nine categories of acidic oxides, basic oxides, amphoteric oxides, non-salt oxides, pseudooxides, peroxides, superoxides, ozonions and similar oxides.

Properties of oxygen: colorless, odorless, gaseous, insoluble in water, oxidizing, can support combustion, and promote combustibility.

Uses of Oxygen:

1.health care, which supplies respiration in an oxygen-depleted, hypoxic or anaerobic environment;

2.In the national defense industry, liquid oxygen is the best accelerant for modern rockets, and liquid oxygen is also needed as an oxidant in supersonic aircraft.

3.In the smelting process, high-purity oxygen is supplied in the steelmaking process, 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.

Properties of nitrogen: It is a colorless and odorless gas, with a smaller density than air, and it is difficult to react with other substances at room temperature, but it can react with some substances under high temperature and high energy conditions.

Uses of nitrogen: Due to the chemical inertness of nitrogen, it is often used as a protective gas, such as melons, fruits, food, and bulb filling gas, to prevent certain objects from being oxidized by oxygen when exposed to air.

Some 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. In addition, the heat generated during the oxidation process is sufficient to maintain the temperature required for the steelmaking process, so the oxygen blowing not only shortens the smelting time, but also improves the quality of the steel. When blast furnace ironmaking, increasing the oxygen concentration in the blast can reduce the coke ratio and increase the output.

In non-ferrous metal smelting, the use of oxygen enrichment can also shorten the smelting time and increase the output.

2.Chemical industry.

In the production of ammonia, oxygen is mainly used for the oxidation of feedstock gases, such as high-temperature cracking of heavy oil and gasification of pulverized coal, to strengthen the process and increase fertilizer production.

3.Defense.

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

4.Healthcare.

Supply respiration: for hypoxia, hypoxia or none.

Oxygen environment, e.g. diving, mountaineering, high-altitude flight, astronautics, medical rescue, etc.

Uses of nitrogen.

Nitrogen is mainly used for the synthesis of ammonia, and the reaction formula is N2+3H2=2NH3 ( The conditions are high pressure, high temperature, and catalyst. The reaction is reversible) and an important raw material for synthetic fibers (nylon, acrylic), synthetic resins, synthetic rubber, etc. Due to the chemical inertness of nitrogen, it is often used as a shielding gas.

In order to prevent some objects from being oxidized by oxygen when exposed to air, fill the granary with nitrogen, which can make the grain not rotten and germinate, and be stored for a long time. Liquid ammonia can also be used as a deep freezer. It is also often used as a cryogenic agent in the hospital for surgery to remove spots, bags, beans, etc., that is, to freeze off spots, bags, beans, etc., but it is prone to scarring, so it is not recommended.

In fact, this question should be thought of like this: because people cannot breathe pure oxygen, they must dilute oxygen before they can breathe, and those that can be used as a solvent to dilute oxygen without affecting people are probably the only nitrogen that can do it.

On the other hand, your problem is self-centered, or another way of thinking, for plants, nitrogen is more important than oxygen, they inhale carbon dioxide and discharge oxygen, for them, oxygen is equivalent to waste gas, nitrogen provides them with nutrients, nitrogen in the air will be decomposed by lightning into nitrogen ions that can accommodate water when thunder, and after being dissolved by rainwater, they enter the soil to provide nutrients for plants. And there are many, many species on the planet besides humans. Maybe it could be said that:

Oxygen is for us animals, while nitrogen is for plants.

Is that easy to understand?

Nitrogen is an inert gas, which accounts for a large proportion of the air, accounting for almost 70%, and can be said to have the effect of protecting the substance from oxidation.