The knowledge of chemistry is usually wonderful, so how about chemicals wholesale

Chemicals wholesale common acid or ion: SO42-(sulfate), NO3-(nitrate), CO32-(carbonate), ClO3-(chloric acid),

MnO4-(permanganate), MnO42-(manganate), PO43-(phosphate), Cl-(chloride),

HCO3-(bicarbonate), HSO4-(hydrogen sulfate), HPO42-(hydrogen phosphate),

H2PO4-(dihydrogen phosphate), OH-(hydroxide), HS-(hydrogen sulfide), S2-(sulfur ion),

NH4+(ammonium or ammonium ion), K+(potassium ion), Ca2+(calcium ion), Na+(sodium ion),

Mg2+(magnesium ion), Al3+(aluminum ion), Zn2+(zinc ion), Fe2+(ferrous ion),

Fe3+(iron ion), Cu2+(copper ion), Ag+(silver ion), Ba2+(barium ion)

3, ① directly represented by the element symbol:

a. Metallic elements. Such as: potassium K copper Cu silver Ag;

b. Solid non-metal. Such as: carbon C sulfur S phosphorus P and so on

c. Noble gases. Such as: helium (gas)He neon (gas)Ne argon (gas)Ar and so on

② Polyatomic composition of the molecule: its molecule is composed of several atoms of the same kind in the lower right corner of the element symbol to write several.

For example, each oxygen molecule is composed of two oxygen atoms, then the chemical formula of oxygen is O2

Diatomic molecule chemical formula: O2 (oxygen), N2 (nitrogen), H2 (hydrogen)

F2 (fluorine), Cl2 (chlorine), Br2 (liquid bromine)

Polyatomic molecule chemical formula: ozone O3, etc

4. Reading and writing of chemical formulas of compounds: read first and write later, and read first after writing

① Compound composed of two elements: read as "something", such as: MgO (magnesium oxide), NaCl (sodium chloride)

② Compounds composed of acid and metal elements: read as "an acid", such as: KMnO4 (potassium permanganate), K2MnO4 (potassium manganate)

MgSO4 (magnesium sulfate), CaCO3 (calcium carbonate)

6, the color of common substances: most gases are colorless, most solid compounds are white, and most solutions are colorless.

Common chemical symbols: 1, the meaning of the element symbol: ① indicates an element ② indicates an atom of the element Note: for the substance composed of atoms, the element symbol has three meanings: such as Cu: can indicate that copper is composed of copper elements; One copper atom; Copper is a substance. Substances composed of atoms: metals such as Fe (iron), Cu (copper), Zn (zinc), Ag (silver), Ba (barium), Hg (mercury), Mn (manganese), etc. Noble gases: He (helium), Ne (neon), Ar (argon), Kr (Krypton), Xe (xenon) some solid non-metals: such as graphite, diamond, P (phosphorus), S (sulfur), Si (silicon), etc. 

2, the meaning of the numbers around the element symbol: such as: 2O: indicates two oxygen atoms O: It's an oxygen molecule, it's an oxygen molecule made up of two oxygen atoms. 

2: The valency of oxygen element is -2 valence: two oxygen molecules 3, must be memorized element symbol 1 ~ 20 elements and common metals, respectively: H He Li Be B C N O F Ne Hydrogen helium lithium beryllium boron carbon nitrogen oxygen fluorine neon Na Mg Al Si P S Cl Ar K Ca Sodium magnesium aluminum silicon phosphorus sulfur chloride argon potassium calcium Fe Cu Zn Ag Ba Hg Mn Iron copper zinc silver barium mercury manganese 4, must be memorized ions: +2+ 2+2+3+ cations: K (potassium ion), Ca (calcium ion), Na(sodium ion), Mg(magnesium ion), Zn(zinc ion), Al(aluminum from 3+2+++ daughter), Fe(iron ion), Fe(ferrous ion), Ag(silver ion), H(hydrogen ion), NH(ammonium ion)4-2-2-2--2- anion: Cl(chloride ion), O(oxygen ion), S(sulfur ion), SO(sulfate ion), NO(nitrate ion), CO(433-3 carbonate ion), OH(hydroxide ion), PO(phosphate ion), etc. 

4 For common atomic groups, the valence of which you should keep in mind, even formula quantities, especially the following six atomic groups: (phosphate ion) 3-2-2-- + atomic group POSOCONOOHNH44334 formula quantities 95 96 60 62 17 18 Two, the color state of common substances 1, white solid: MgO (magnesium oxide), PO (phosphorus pentoxide), CaO (calcium oxide), NaOH (sodium hydroxide), Ca(OH) (calcium hydroxide 252), KClO (potassium chlorate), KCl (potassium chloride), NaCO (Sodium carbonate), NaCl (sodium chloride), CuSO (anhydrous copper sulfate); 3234Fe (iron), Mg (magnesium) for silver-white (mercury (Hg) for silver-white liquid) 2, black solid: graphite, carbon powder, iron powder, CuO (copper oxide), MnO (manganese dioxide), FeO (ferric oxide) 234▲KMnO (potassium permanganate) for purple black: ▲ sulfur (S) : light yellow: ▲ Cu(OH)CO (basic copper carbonate) is green 42233, red solid: Cu(copper), FeO (iron oxide or iron trioxide), HgO (mercury oxide), red phosphorus (P) 232+2+3+4, the color of the solution: where the solution containing Cu(copper ion) is blue; The solution containing Fe (ferrous ion) is light green; Where the solution containing Fe (iron ion) is brownish yellow, the rest of the solution is generally not colorless. (potassium permanganate solution is purplish red) 

15, precipitation (that is, salt and alkali insoluble in water) : ① Salt: white precipitation: CaCO (calcium carbonate), BaCO (barium carbonate) (soluble in acid) 33 AgCl (silver chloride), BaSO (barium sulfate) (also insoluble in dilute HNO) 43② base: blue precipitation: Cu(OH) (copper hydroxide); Reddish brown precipitate: Fe(OH) (iron hydroxide); White precipitate: remaining alkali. 236, (1) Gases with irritating gases: NH (ammonia), SO (sulfur dioxide), HCl (hydrogen chloride) (all colorless) 32 (2) colorless and odorless gases: O (oxygen), H (hydrogen), N (nitrogen), CO (carbon dioxide), CH (methane), CO (22224 carbon monoxide) (highly toxic) ▲ Note: Liquid with pungent odor: hydrochloric acid, nitric acid, acetic acid. Alcohol is a liquid with a special gas. 

7, toxic, gas: CO; Liquid: CHOH (methanol); Solid: NaNO (sodium nitrite) CuSO (anhydrous copper sulfate, can be used as 324 fungicide, mixed with hydrated lime and sky blue viscous substance - Bordeaux liquid) combination reaction: Chemical equation (expression) Phosphorus produces a large amount of white smoke, heat release, and white solid 4P+5O2PO225① Charcoal burns in the air continuously red heat, smokeless and flameless; Charcoal in the oxygen charcoal burning, and emit white light C+OCO22② heat, generating can make the clarified lime water become turbid gas