Embarrassment, the third year of junior high school chemistry equation rolling melon ripe people com

The first is the substitution of salt solutions, as long as one metal is found to be more active than another, for example:

fe + cuso4 == feso4 + cucu + 2agno3 ====cu(no3)2+2ag second I don't know much, but help you write a few:

cao+sio2= high temperature = casio3

Na2O + SiO2 = High temperature = Na2SiO3

The third one should be a lot, for example.

hcl+cuo=cucl2+h2o

Fe2O3+6HCl=2FeCl3+3H2O4. BaCl2 + H2SO4 = BaSO4 + 2HCl fifth. CuCl2 + Ba(OH)2 = Cu(OH)2 + BaCl2 Sixth.

na2co3 + cacl2 = caco3↓ +2nacl

Metal 1 + Salt 1 Metal 2 + Salt 2

Metal 1 cannot be filled except for K, NA, CA; Salt 1 to be soluble) Fe + CuSO4 = FeSO4 + Cu

Metal oxides + non-metal oxide salts.

CaO+CO2=High Temperature=CaCO3

Acids + non-metal oxides + salts + water.

sio2+4hf=sif4+2h2o

Salt 1 + Acid 1 Salt 2 + Acid 2

CaCO3 + 2HCl = CaCl2 + H2CO3 H2CO3 = H2O + CO2 (carbonic acid unstable redecomposition).

Salt 1 + Alkali 1 Salt 2 + Alkali 2

2NaOH + CuCl2 = Cu(OH)2 precipitate + 2NaCl2 salt 1 + salt 2 salt 3 + salt 4

Na2CO3 + CaCl2 = CaCO3 (precipitate) + 2NaCl

Metallic + non-metallic salts.

cu+cl2=cucl2

Metal 1 + Salt 1 Metal 2 + Salt 2

mg+2hcl=mgcl2+h2↑

Metal oxides + non-metal oxide salts.

cao+sio2=casio3

Acids + non-metal oxides + salts + water.

4hf+sio2+=sif4+2h2o

Salt 1 + Acid 1 Salt 2 + Acid 2

Na2CO3+2HCl=2NaCl+(H2O+CO2)Salt 1 + Base 1 Salt 2 + Base 2

Na2SO4 + BA(OH)2 = BaSO4 + 2NaOH Salt 1 + Salt 2 Salt 3 + Salt 4

na2co3+bacl2=2nacl+baco3↓

2Na + Cl2 = Ignition = 2NaCl

fe+cuso4=feso4+cu

The second one is really beginner, so I might as well listen to the following.

hcl+naoh=nacl+h2o

Oxides are made up of two elements, and NaOH is made up of three elements!

2HCl+Na2CO3=H2CO3+2NaClCuSO4+2NAOH=Cu(OH)2+Na2SO4CaCl2+Na2CO3=CaCO3 +2NACL thinks that the upstairs are all from high school, so I gave the example of junior high school.

Metal 1 + Salt 1 Metal 2 + Salt 2

Fe + CuCl2 ***** FeCl2+ Cu metal oxides + non-metal oxide salts.

cao + co2 ====caco3

Acids + non-metal oxides + salts + water.

This should not be found in the junior high school range, the hydrates corresponding to non-metallic oxides are generally acids, unless those substances in an abnormal valence state, such as n...But this one is high school.

Salt 1 + Acid 1 Salt 2 + Acid 2

BaCl2 + H2SO4 === BaSO4 +2HCl Salt 1 + Alkali 1 Salt 2 + Alkali 2

Na2SO4 + BA(OH)2 = BaSO4 + 2NaOH Salt 1 + Salt 2 Salt 3 + Salt 4

na2so4+bacl2 ===baso4↓+2nacl

Metal + Non-Metal Salt 2Na + Cl2 = Ignition = 2NaCl Metal 1 + Salt 1 Metal 2 + Salt 2

Metal 1 cannot be filled except for K, NA, CA; Salt 1 should be soluble) Example: Fe+CuSO4=FeSO4+Cu

Metal oxides + non-metal oxide salts.

Example: cao+co2==caco3

Acids + non-metal oxides + salts + water.

Salt 1 + Acid 1 Salt 2 + Acid 2

Ba(NO3)2 + MGso2 = BASO4 + MG(NO3)2 salt 1 + base 1 salt 2 + base 2

MgSO4 + BA(OH)2 = MG(OH)2 + BASO4 Salt 1 + Salt 2 Salt 3 + Salt 4

2agno3+mgcl2=2agcl↓+mg（no3）2

Metal 1 + Salt 1 Metal 2 + Salt 2

mgcl2+cu=cucl2+mg

Metal oxides + non-metal oxide salts.

cao+sio2=casio3 (high temperature).

Acids + non-metal oxides + salts + water.

sio2+4hf=sif4+2h2o

Salt 1 + Acid 1 Salt 2 + Acid 2

Na2SiO3+2HCl=H2SiO3+2NaClSalt1+Base1Salt2+Base2

alcl3+

Salt 1 + Salt 2 Salt 3 + Salt 4

bacl2+na2so4=baso4+2nacl

1. The alkali undergoes a neutralization reaction to generate chloride and water.

HCl + NaOH = NaCl + H2O2 can react with active metal elements to form hydrogen.

fe+ 2hcl =fecl2+ h2↑

3.It can react with metal oxides to form salts and water.

cuo+2hcl=cucl2+h2o

mgo+2hcl=mgcl2+h2o

fe2o3+6hcl=2fecl3+3h2o4.It can react with salts to form new acids and salts.

2hcl+na2so3=so2↑+h2o+ 2naclna2s2o3+2hcl=2nacl+h2o+so2↑+s↓fes+2hcl=h2s↑+fecl2

5.It can react with most carbonates and bicarbonate (HCO3-) to generate carbon dioxide and water K2CO3 + 2HCl = 2KCl + CO2 + H2ONahCO3 + HCl = NaCl + CO2 + H2O In addition, hydrochloric acid can react with silver nitrate to generate silver chloride insoluble in dilute nitric acid, which is insoluble in water and produces precipitation. hcl+agno3===hno3+agcl↓

Hydrochloric acid is commonly used in laboratories to produce carbon dioxide.

caco3+2hcl=cacl2+h2o+co2↑

precipitation arrows) +H2O

high temperature) 2CO

precipitation arrows) +H2O

2Na2O2+2CO2=2Na2CO3+O2 FeCl3 + 3H2O = Fe(OH)3 +3HClC 3CuO+2NH3 = 3Cu+3H2O+N2 4CO+2NO2==N2+4CO2 4NA+3CO2=2NA2CO3+C Due to some conditions, it is difficult to type, please write it down yourself, I hope to adopt.