What are the chemical formulas that must be mastered in the third year of junior high school, and wh

Water H2O Rust Fe2O3 Oxygen O2 Hydrogen H2 Nitrogen N2 Chlorine Cl2 Ammonia NH3 Carbon Monoxide CO Carbon Dioxide CO2 Sulfur Dioxide SO2 Sulfur Trioxide SO3 Nitrogen Dioxide NO2 Methane CH4 Calcium Oxide CAO Magnesium Oxide MGO Copper Oxide CUO Manganese Dioxide MNO2 Aluminium Oxide AL2O3 Ferric Oxide Fe2O3 Fe2O3 Fe2O3 Fe2O3 Fe2O5 Hydrogen Peroxide H2O2 Hydrochloric Acid HCL Nitric Acid HNO3 Sulfuric Acid H2SO4 Carbonate H2CO3 Caustic Soda NaOH Potassium Hydroxide KOH Calcium Hydroxide Ca(OH)2 Magnesium Hydroxide MG(OH)2 Aluminum Hydroxide AL(OH)3 Iron Hydroxide Fe(OH)3 Ferrous Hydroxide Fe(OH)2 Copper Hydroxide Cu(OH)2 Barium Hydroxide BA(OH)2 Potassium Sulfate K2SO4 Potassium Bisulfate KhSO4 Sodium Sulfate Na2SO4 Sodium Sulfite Na2SO3 Sodium Bisulfate NaHSO4 Magnesium Sulfate MGSo4 Aluminum Sulfate Al2( SO4)3 Iron sulfate Fe2(SO4)3 Ferrous sulfate FeSO4 Zinc sulfate ZNSO4 Copper sulfate CuSO4 Barium sulfate BASO4 Calcium carbonate CaCO3 Sodium carbonate NA2CO3 Sodium bicarbonate NAHCO3 Potassium chloride KCl Sodium chloride NaCl Zinc Chloride ZNCl2 Ferric chloride FeCl3 Ferrous chloride FeCl2 Copper chloride CuCl2 cuprous chloride CuCl Silver chloride AGCL Barium chloride BACL2 Potassium nitrate KNO3 Sodium nitrate nano3 Zinc nitrate Zn(NO3)2 magnesium nitrate mg(NO3)2 ferric nitrate Fe(NO3)3 copper nitrate Cu(NO3)2 mercury nitrate Hg(NO3)2 silver nitrate AGNO3 calcium nitrate CA(NO3)2 potassium permanganate KMno4 potassium chlorate KCLO3 potassium manganate K2mnO4 ammonia NH3·H2O calcium sulfate CaSO4

Iron carbonate Fe2CO3

In fact, there are many more, but what I give you is more important, although it seems that there are a lot, but it is easy to remember, in addition to chemical formulas, there are also chemical equations are also more important, inference questions occupy a more important position in the high school entrance examination, and basic questions are also.

(1) The chemical formula is written by the three elements H, C, O, and Na as required.

Gas: H2 ,02 Solid Element: C, Na Non-metallic Oxide:

CO, CO2, H20 Metal Oxides: Na2O, Na2O2 Acids: H2CO3 Bases:

NaOH salt: Na2CO3

2) There are three elements, h, n, and o, and the chemical formula is written as required.

Highest gas element in the air: N2 Gas element with Martian wood re-ignition: O2

Non-metal oxides: NO2, N2O5 acids: HNO3 bases: salts: NH4NO3

Gas element: H2 O2 Solid element: Na C Non-metallic oxide:

H2O Co CO2 Metal Oxide: Na2O Na2O2 Acid: H2CO3 Base:

NaOH salts: Na2CO3 NaHCO3

2) There are three elements, h, n, and o, and the chemical formula is written as required.

The most abundant gas element in the air: N2 Gas element with re-ignition of Martian wood strips: O2 Non-metallic oxides:

H2O No No2 Acid: Hno3 Hno2 Base: Salt:

nh4no3