What is the chemical formula of silica, what is the structural formula of silica?

Silicon dioxide. The structural formula is as follows:

The chemical formula of silica is SIO, where silicon atoms and oxygen atoms are arranged in a long-range order to form crystalline silica, and short-range ordered or long-range disordered arrangements form amorphous silica. In silica crystals, silicon atoms are located in a tetrahedron.

In the middle of the car, four oxygen atoms are located on the four apex angles of the tetrahedron;

Many of these tetrahedra are connected by oxygen atoms at the apical angle, each of which is common to the two tetrahedrons, i.e., each oxygen atom is combined with two silicon atoms. The simplest form of silica is SiO2, but SiO2 does not represent a simple molecule (only the ratio of the number of atoms of silicon and oxygen in a silica crystal).

Chemical properties

The chemical properties are relatively stable. Does not react with water. It is an acidic oxide and does not react with ordinary acids. Hydrofluoric acid.

It reacts with silica to form gaseous silicon tetrafluoride. Silicates and water are formed by reacting with a hot, concentrated alkali solution or molten alkali. It reacts with a variety of closed reed metal oxides at high temperatures to form silicate. The nature of silica is not active, it is not compatible with the removal of fluoride and hydrogen fluoride.

other halogens.

Hydrogen halide as well as sulfuric acid and nitric acid.

Perchloric acid action (except for hot concentrated phosphoric acid).

Common concentrated phosphoric acid (or pyrophosphoric acid) can corrode silica at high temperatures to form heteropolyacids, and molten borate or boric anhydride can also corrode silica at high temperatures, in view of this property, borate can be used as a flux in ceramic firing, in addition to hydrogen fluoride can also make silica dissolved acids to produce fluorosilicic acid that is easily soluble in water.

Silica (chemical formula SiO2) is an inorganic compound with the following common structural formulas:

1.Quartz structure: Quartz is the most common crystal form of silica and has a vertical and square crystal system.

Its structure consists of silicon atoms and oxygen atoms, with silicon atoms forming a tetrahedral structure with each oxygen atom. Quartz is a typical three-dimensional structure in which silicon and oxygen atoms are connected by covalent bonds.

2.Hydrated Silicate Gel (Silicone) Structure: Silica gel is a porous material that resembles quartz in structure, but it also contains some water molecules. In the structure of hydrated silicate gel, the network structure formed by silicon atoms and oxygen atoms is embedded in it.

3.Amorphous structure: In addition to quartz and hydrated silicate gel in crystalline form, silica can also exist in an amorphous form. Amorphous silica does not have a well-defined crystalline structure, and its atomic arrangement is not long-range ordered.

It is important to note that the structural formula of silica can be expressed in a variety of ways, and the above mentioned are several common structural formulas.

The structural formula of silica is SiO2. It is a compound composed of silicon atoms and oxygen atoms. In silica, one silicon atom forms a covalent bond with two oxygen atoms.

The silicon atom has four electrons in its valence electron shell, whereas the oxygen atom has six electrons in its valence electron shell. Thus, each oxygen atom shares two pairs of electrons with the silicon atom to form a silicon-oxygen bond. In the whole structure, the silicon atom is located in the center, and two oxygen atoms are attached to each of them.

This structure forms a hard, colorless solid that is one of the common components found in many ores and rocks.

Silica (chemical formula: SiO2) is a compound composed of silicon atoms and oxygen atoms. It is one of the most common compounds in the earth's crust and a major component of many rocks and minerals.

Silica is found in a variety of crystal forms, the most common of which is quartz. Quartz has the chemical formula SiO2, which is a highly crystalline silicate mineral of a wide limb species. The structure of a quartz crystal is composed of silicon (Si) and oxygen (O) atoms, and the silicon atoms form a tetrahedral structure with the four oxygen atoms in plane, constituting the basic unit of SiO4.

These basic units form a stable crystal structure by sharing oxygen atoms.

In addition to quartz, silica is also available in other crystalline forms, such as tourmaline (cristobalite), quartz sand (sand) and nano-silica. These crystal forms have different crystal structures but they all have the chemical formula SiO2.

To summarize, the structural formula of silica is SiO2, which is a compound made up of silicon atoms and oxygen atoms. The most common form of crystal is quartz, which is structured by the basic unit of SiO4, which forms a stable crystal structure by sharing oxygen atoms.

Silicon oxide includes silicon monoxide (SiO),Silicon dioxide. （sio2）。

Silicon monica, black-brown to loess amorphous powder, melting point 1702 °C, boiling point 1880 °C, density grams cubic centimeters. Soluble in dilute hydrofluoric acid.

and nitric acid. Insoluble in water. When heated in air, a white silica powder is formed.

Silica, the most common and stable compound of silicon, is widely distributed in nature and constitutes a variety of minerals and rocks. Silica.

It exists in both crystalline and amorphous states.

Main uses:

Silica is used in the manufacture of flat glass, glass products, foundry sand, fiberglass.

Ceramic glaze, sandblasting for rust prevention, sand for filtration, fluxes, refractories and the manufacture of lightweight bubble concrete.

Silica is an important raw material for the manufacture of optical fibers. Generally, the purer quartz can be used to make quartz glass.

Expansion coefficient of quartz glass.

It is very small, equivalent to 1 18 of ordinary glass, can withstand drastic changes in temperature, and has good acid resistance (except HF), therefore, quartz glass is often used to make chemical instruments that can withstand high temperatures.

Silica is used in the manufacture of glass, quartz glass, water glass.

Optical fibers, important components of the electronics industry, optical instruments, handicrafts and refractory raw materials, are important materials for scientific research.

The above content reference: Encyclopedia - Silicon Oxide.

Encyclopedia - Silica.

The molecular formula of silica is SiO2.

The principle to always follow when writing a chemical formula (molecular formula) is the algebraic sum of the valency of the elements in the chemical formula as o. The outermost shell of the silicon atom has 4 electrons, all of which are lost in the formation of the compound, and the valency is 104, while the outermost shell of the oxygen atom has 6 electrons, and 2 of them are obtained to achieve stability, and 2 oxygen atoms are required to receive the electrons lost by silicon.

Pure substances in chemistry have their own chemical formulas, and only by knowing the meaning of the chemical formulas can we learn chemistry faster and better. Chemical formulas are also a compulsory knowledge point in the chemistry high school entrance examination, and if you can't write chemical formulas, you can't write chemical equations. Therefore, it is important to pay attention to the writing of chemical formulas and keep in mind its significance.

The meaning of the chemical formula

First of all, the chemical formula only denotes a pure substance, and a mixture does not have a chemical formula. The formula that is made up of substances represented by element symbols and numbers is called a chemical formula. The chemical formula is the experimental formula, molecular formula, structural formula, and schematic formula.

The chemical formula is only a manifestation of the composition of matter.

Macro Implications adenotes a substance; b.indicates the elemental composition of the substance; Micro Significance a

represents a molecule of the substance; b.indicates the molecular composition of the substance; The meaning of the quantity aRepresents the ratio of the number of atoms in a molecule of a fictitious substance; b.

Indicates the mass ratio of the elements that make up the substance.

Silicon dioxide. Chemical formula tung bark: SIO. Silica is an inorganic substance with the chemical formula SiO, silicon atoms and oxygen atoms are arranged in a long-range order to form crystalline silica, and short-range ordered or long-range disordered arrangements to form amorphous silica.

In silica crystals, silicon atoms are located in a tetrahedron.

, four oxygen atoms are located on the four apex corners of the regular tetrahedron, and many of these tetrahedra are connected by oxygen atoms at the apex corners, each of which is common to two tetrahedrons, i.e., each oxygen atom is combined with two silicon atoms.

The simplest form of silica is sio, but sio does not represent a simple molecule next to a nucleus (only the ratio of the number of atoms of silicon and oxygen in a silica crystal). Pure natural silica crystal is a hard, brittle, insoluble colorless and transparent solid, which is often used in the manufacture of optical instruments.

The chemical formula of silica is SIO. Silica is available in both crystalline and amorphous forms. Silica that exists in nature such as quartz and quartz sand.

and so on, collectively referred to as silica. Pure quartz is a colorless crystal, a large and transparent prismatic quartz crystal is called crystal, and a purple one with trace impurities is called amethyst.

Light yellow, golden and brown are called smoky quartz. Chalcedony.

Both agate and jasper are colored quartz crystals that contain impurities. Sand is fine grains of quartz mixed with impurities.

Physical properties: crystalline silicon dioxide, melted with a strong alkali when heated to form silicate; Insoluble in water, it can react with HF to form gaseous SIF4.

Chemical properties: The chemical properties are relatively stable. Does not react with water. It is an acidic oxide.

It does not react with ordinary acids. Hydrofluoric acid.

It reacts with silica to form gaseous silicon tetrafluoride. Silicates and water are formed by reacting with a hot, concentrated alkali solution or molten alkali. A variety of metal oxides react with the modified oak at high temperatures to form silicate.

Silica is also known as silica and has the chemical formula SIO. There are two types of silica in nature: crystalline silica and amorphous silica. Crystalline silica is divided into three types: quartz, lemostomatite and cristobalite due to different crystal structures.

Pure quartz is a colorless crystal, and a large and transparent prismatic quartz is called a crystal. If the crystal containing trace impurities has different colors, there are amethyst, citrine, ink quartz, etc. Ordinary sand is fine quartz crystals, with yellow sand (more iron impurities) and white sand (less impurities, purer).

In the silica crystal, the 4 valence electrons of the silicon atom and the 4 oxygen atoms form 4 covalent bonds, the silicon atom is located in the center of the regular tetrahedron, and the 4 oxygen atoms are located on the 4 apex angles of the regular tetrahedron, and many such tetrahedron are connected by the oxygen atoms of the apex angle, and each oxygen atom is common to two tetrahedrons, that is, each oxygen atom is combined with two silicon atoms. SIO is the simplest form of representation of composition, which simply represents the ratio of the number of atoms of silicon and oxygen in a silica crystal. Silica is an atomic crystal.

The bond energy of Si—O bond in Sio is very high, and the melting point and boiling point are high (melting point 1723, boiling point 2230). The refractive index is approximate.

The refractive index of various silica products is: quartz sand; Pink quartz is; Vein quartz is; Diatomaceous earth is; Vapor phase silica is; Precipitated silica for.

Diatomaceous earth existing in nature is amorphous silica, which is the remains of diatoms of lower aquatic plants, which is white solid or powdery, porous, light and soft solid, and has strong adsorption.

The chemical formula of silica is SIO

Hello, SiO-related leakage and expansion: The simplest expression of silica is SiO2, but SiO2 does not represent a simple molecule (only the ratio of the number of atoms of silicon and oxygen in a silica crystal). Pure natural silica crystal is a hard, brittle, insoluble colorless and transparent solid, often used in the manufacture of optical instruments.

Chemical formula SiO2, formula quantity. Also called silica, it is a hard and insoluble solid. It often occurs in three variants: quartz, lepidemite, and cristobalite quartz.

Almost 65 kilometers down 16 kilometers from the ground are silica ores. Natural silica is divided into two categories: crystalline and amorphous, and the main miracle of crystalline silica is to exist in quartz ore.