What are the common chemical substances in junior high school chemistry, junior high school chemistr

Diamond, graphite: c

Mercury, mercury: hg

3) Quicklime, calcium oxide: CAO

4) Dry ice (solid carbon dioxide): CO2

5) Hydrochloric acid, hydrochloric acid: HCl

6) Sulfurous acid: H2SO3

7) Hydrosulfuric acid: H2S

8) Hydrated lime, slaked lime: Ca(OH)2 limestone CaCO3

9) Caustic soda, caustic soda, caustic soda: NaOH

10) Soda ash: Na2CO3 sodium carbonate crystals, soda ash crystals: Na2CO3·10H2O

11) Sodium bicarbonate, acid sodium carbonate: NaHCO3 (also called baking soda).

12) Cholelum, blue alum, copper sulfate crystals: CuSO4·5H2O

13) Apatina, malachite: Cu2(OH)2CO3 (a substance that decomposes to form three oxides).

14) Methanol: CH3OH is toxic, blind, and dead.

15) Alcohol, ethanol: C2H5OH

16) Acetic acid, acetic acid (glacial acetic acid) CH3COOH (CH3COO-acetate ion) have the general properties of acids.

17) Ammonia: NH3 (alkaline gas).

18) Ammonia, ammonia monohydrate: NH3·H2O (a common alkali with the universality of alkali, and a kind of alkali that does not contain metal ions).

19) Sodium nitrite: nano2 (industrial salt, toxic).

20) Sulfuric acid: H2SO4

Diamond, graphite: C (test point: graphite conductive, diamond does not conduct).

Mercury: Hg (test center: the only metal that is liquid at room temperature).

Quicklime, calcium oxide: cao (can be used as a desiccant.)

Hydrated lime, slaked lime: Ca(OH)2 Dry ice (solid carbon dioxide): CO2 (can be used as a refrigerant.)

Three strong acids: hydrochloric acid, hydrochloric acid (HCl), sulfuric acid (H2SO4), nitric acid (HNO3).

Sulfurous acid: H2SO3

Hydrosulfuric acid: H2S

Sodium hydroxide (common name: caustic soda, caustic soda, caustic soda): NaOH

Sodium carbonate (common name: soda ash): Na2CO3 sodium carbonate crystals, soda ash crystals: Na2CO3·10H2O

Sodium bicarbonate, acid sodium carbonate (commonly known as baking soda): NaHCO3

Copper sulfate crystal (common name: bile alum, blue alum): CuSO4·5H2O

Basic copper carbonate (commonly known as patina, malachite): Cu2 (OH) 2CO3 (test point: a substance that can be decomposed into three oxides).

Ammonia: NH3 (test center: alkaline gas).

Sodium nitrite: nano2 (industrial salt, toxic).

Here are a few very important things:

Hydrogen peroxide (common name: hydrogen peroxide): H2O2 (test center: preparation of O2, Mno2 as catalyst).

Potassium chlorate: KCLO3 is used to produce oxygen, and Mno2 is used as a catalyst.

Potassium permanganate: KMno4 for oxygen.

Iron oxide: the main component of Fe2O3 rust.

Limestone CaCO3 is used to produce CO2

Sulphur · sulphur: s

Mercury. Mercury: hg

Sodium chloride. Table salt: Nacl

Sodium carbonate. Soda ash. Soda: Na2CO3

Sodium bicarbonate. Baking soda: nahco3

Sodium hydroxide. Caustic soda. Caustic soda. Charged sodium: Naoh

Potassium hydroxide. Charged potassium: koh

Potassium nitrate. Saltpeter. Fire Nitrate: KNO3

Potassium permanganate. Gray manganese oxygen. PP powder: KMNO4

Potassium carbonate. Potash. Oxaline: K2CO3

Calcium hydroxide. Hydrated lime. Slaked lime: Ca(OH)2

Calcium oxide. Quicklime: cao

Calcium carbonate. Limestone. Marble: caco3

Magnesium oxide. White as earth. Burning bitter soil: MGO

Magnesium carbonate. Magnesite: MGCo3

Alumina. Corundum. Bauxite: al2o3

Potassium aluminum sulfate crystals. Alum: kal(SO4).

Iron oxide. Hematite. Rust: Fe2O3

Ferric oxide. Magnetite. Iron black: Fe3O4

Ferrous sulfate crystals. Alum:

Copper sulphate crystals. Cholelum. Blue Alum:

Basic copper carbonate. Apatina: Cu2(OH)2CO3

Manganese dioxide. Pyrolite: mno2

Silicon dioxide. Sand. Quartz: SiO2

Carbon monoxide. Gas: co

Carbon dioxide. Dry ice: CO2 (solid).

Ammonium sulphate. Ammonium sulfate: (NH4)2SO4

Ammonium nitrate. Ammonium nitrate: NH4NO3

Ammonium bicarbonate. Ammonium carbide: H4HCO3

Calcium phosphate. Phosphate rock powder: Ca3(PO4)2

Methane. Biogas: CH4

Ethanol. Alcohol: C2H5OH

Acetic acid. Acetic acid. Glacial acetic acid: CH3COOH

The properties of a substance that can only be manifested in a chemical change are called chemical properties.

Chemical properties of junior high school: such as: flammability, stability, acidity, alkaline, oxidation, reduction, etc., corrosiveness, etc.

Chemistry is a kind of natural science, which studies the properties, composition, structure and change laws of matter at the molecular and atomic levels.

Chemistry is a natural science that studies the properties, composition, structure, changes, uses, preparation methods, and changes of substances. Chemistry is closely related to industry, agriculture, daily life, medicine, materials, etc.

For example, coal, oil and natural gas are burned to produce carbon dioxide and other substances.

The object of chemical research deals with the interrelationships between matter, or between matter and energy. Traditional chemistry is often about the contact and change of two substances, i.e., a chemical reaction, or the process by which one substance becomes another. These changes sometimes require the use of electromagnetic waves, which are responsible for initiating chemical reactions.

Sometimes, though, chemistry doesn't have to be about reactions between substances. Spectroscopy is the study of the relationships between matter and light, and these relationships do not involve chemical reactions.