The chemical formulas of the 7 oxygen compounds commonly found in junior high school are:

1. Oxidation: In addition to rare gases and less active metal elements such as gold, platinum and silver, most of the nuclides can react with oxygen; 2. Relatively active (relative to other gases); 3. Oxygen has combustion, and almost all organic compounds can be violently burned in oxygen to produce carbon dioxide and water.

Oxygen is the most widely distributed in nature, covering the mass of the crust, and is the element with the highest abundance of limbs. 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 mixed with pure oxygen with combustible gas (such as acetylene) to produce a flame at an extremely high temperature, 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.

Definition of oxide in junior high school: oxide is a chemical compound, and its composition contains only two elements, one of which must be oxygen, and the other is called metal oxide if it is a metal element; If the other element is not a metallic element, it is called a non-metallic oxide.

Broadly speaking, oxide refers to a binary compound composed of oxygen and another chemical element, such as carbon dioxide (CO), calcium oxide (CAO), carbon monoxide (CO), etc. However, compounds formed by the combination of oxygen and more electronegative fluorine are generally referred to as fluorides rather than oxides.

The oxide classification is summarized as follows:

According to the type of another element that is oxidized with it, it is divided into metal oxides and non-metal oxides.

According to the type of bonding or the type of constituent particles, it can be divided into ionic oxides and covalent oxides

1.Ionic oxides: oxides formed by some active metal elements, such as Na2O, CAO, etc.

2.Covalent oxides: oxides of some metallic elements and all non-metallic elements such as MNO2, Hgo, SO2, ClO2, etc.

According to the oxidation state of oxygen, it is divided into common oxides (the oxidation state of oxygen is -2), peroxides (the oxidation state of oxygen is -1 2), superoxides (the oxidation state of oxygen is -1 2) and ozonation (the oxidation state of oxygen is -1 3).

According to the acidity and alkalinity and whether it forms salts with water, and the salts generated are divided into acidic oxides, basic oxides and amphoteric oxides, neutral oxides, and complex oxides.

Oxygen is a chemically active gas, it can oxidize with metals, non-metals, compounds and other special substances, the intensity of the reaction varies according to different conditions, it can be manifested as slow oxidation, burning, explosion, etc., and a large amount of heat is released in the reaction.

1) Oxygen reacts with non-metals.

Charcoal burns violently in oxygen, emitting white light, generating colorless, odorless gas that can make the clarified lime water turbid, and sulfur burns violently in oxygen, producing a bright blue-purple flame to produce colorless

Phosphorus White phosphorus can be slowly oxidized with oxygen in the air, and when it reaches the ignition point (40), it causes spontaneous combustion

Hydrogen is burned in oxygen, producing a pale blue flame that covers a dry cold beaker in the flame.

2) Oxygen reacts with metals.

Magnesium burns violently in the air or in oxygen, emitting a dazzling white light to produce a white powdery substance, and the red-hot iron wire burns in oxygen and sparks to produce a black solid substance.

3) Oxygen reacts with compounds.

Carbon monoxide is burned in oxygen to produce a blue flame that produces a gas that muddies the clarified lime water.

Methane (biogas) is burned in oxygen to produce gas and water that muddy lime water.

Candles burn violently in oxygen to produce carbon dioxide and water.