Write the chemical equations for the following reactions as required

1.Iron burns 2Fe +3Cl2 === 2FeCl3 in chlorine gas

Iron reacts with sulfur Fe + S === Fes

Iron reacts with water 3Fe + 4H2O === Fe3O4 +4H2

Iron reacts with non-oxidizing acids Fe +2HCl == FeCl2 + H2

Iron reacts with excess dilute nitric acid Fe + 4Hno3 (dilute) ==Fe(NO3)3 + No + 2H2O

Excess iron reacts with dilute nitric acid 3Fe + 8Hno3(dilute) == 3Fe(NO3)2 + 2NO +4H2O

2al+6hcl=2alcl3+3h2↑

As with acid roots, impurities are removed by displacement method for impurities with different metal activity. To remove copper sulfate impurities, but not to introduce new impurities in ferrous sulfate. Iron can be used to react with copper sulfate to convert copper sulfate to ferrous sulfate.

The specific operation is as follows: dissolve ferrous sulfate mixed with a small amount of copper sulfate impurities in water; Excessive FE powder is added to the solution (to expand the contact area); After the full reaction, the filtration and filter residue (solid on the filter paper) is a mixture of copper and iron, and the filtrate is ferrous sulfate solution; After evaporation and concentration, ferrous sulfate crystals can be obtained.

Fe+2O2===(ignition) Fe3O4

4fe+3o2==2fe2o3

AL+6HCl (dilute sulfuric acid and other acids are also OK) = 2ALC3+3H2 (gas symbol) 3, CuSO4+FE=Fes04+Cu

Upstairs must have copied a lot of answers and all of them were from high school.

Ideas for solving the problem of rolling reed: (1) Sen Bisun carbon dioxide makes the clarified lime water turbid: the reactants are carbon dioxide and calcium hydroxide, and the products are calcium carbonate and water, and the chemical formulas are written correctly;

2) Carbon monoxide reduction of hematite (the main component is iron oxide): reactants carbon monoxide and iron oxide, the products are carbon dioxide and iron, and the reaction conditions are high temperature;

3) The hydrogen peroxide solution is decomposed with manganese dioxide as a catalyst to produce oxygen: the reactant hydrogen peroxide, which produces water and oxygen in this chain, and the reaction conditions are manganese dioxide as a catalyst;

4) Soda ash is put into dilute hydrochloric acid: the reactants sodium carbonate and hydrochloric acid, the products sodium chloride, carbon dioxide, water, can write chemical equations

1) Know the reactants and products, so the chemical equation is CO2 + Ca(OH)2=CaCO3 + H2O;

2) Know the reactants, products, and reaction conditions, so the chemical equation is 3CO+Fe2O3

High temperature 3CO2+2Fe;

3) Know the reactants, products, and reaction conditions, so the chemical equation is 2H2O2

mno2 2h2o+o2↑；

4) Knowing the reactants and products, the chemical equation is Na2CO3 + 2HCl = 2NaCl + CO2 + H2O

Therefore, the answer is: (1) CO2 + Ca(OH)2 = CaCO3 + H2O;

2）3co+fe2o3

High temperature 3CO2+2Fe;

3）2h2o2

mno2 2h2o+o2↑；

4）na2co3+2hcl=2nacl+co2↑+h2o

2. Write the chemical equations of the following reactions as required:

1) Carbon dioxide makes the clarified lime water turbid: CO2+Ca(OH) 2=CaCo3 +H2OCo 2+Ca(OH) 2=CaCo3 +H2O;

2) Carbon monoxide reduction hematite (the main component is iron oxide): 3CO+Fe2O3 high temperature3CO2+2FE3CO+FE2O3 High temperature 3co2+2fe；

3) The hydrogen peroxide solution is decomposed with manganese dioxide as a catalyst to produce oxygen: 2H2O2 Mno2 2h2o+o2↑2h2o2 mno2 . 2h2o+o2↑；

4) Soda ash is put into dilute hydrochloric acid: Na2Co3+2HCl=2NaCl+CO2+H2ONA2CO3+2HCl=2NaCl+CO2+H2O

Problem Solving Ideas: Only by being familiar with reactants, products and reaction conditions, according to the two principles of the law of conservation of mass, can you write the correct chemical equation Only by being familiar with the concepts and characteristics of basic reaction types can you make correct judgments

1) Carbon dioxide and water react to form carbonic acid The reaction is composed of two oxides to form a substance, which meets the requirements of the topic The chemical equation of the reaction is: CO2 + H2O = H2CO3 2) Potassium permanganate reacts under heating conditions to produce potassium manganate, manganese dioxide and oxygen The chemical equation of the reaction is: 2kmNO4

k2mno4+mno2+o2↑．

3) Carbon dioxide reacts with calcium hydroxide to form calcium carbonate precipitate and water The chemical equation of the reaction is: CO2 + Ca(OH)2=CaCO3 +H2O 4) Carbon monoxide reacts with iron oxide at high temperature to form iron and carbon dioxide The chemical equation of the reaction is: 3CO+Fe2O3

High temperature 2Fe+3CO2

5) Iron oxide reacts with dilute sulfuric acid to form iron sulfate and water

The chemical equation of this reaction is: 3H2SO4+FE2O3=FE2(SO4)3+3H2O

Therefore, the answer is: 1) CO2 + H2O = H2CO3

2）2kmno4

k2mno4+mno2+o2↑

3）co2+ca（oh）2=caco3↓+h2o4）3co+fe2o3

High temperature 2Fe+3CO2

5) 3H2SO4 + FE2O3 = FE2 (SO4) 3 + 3H2O Comments: Test points for this question: Writing chemical equations, text expressions, ionization equations Test center comments:

This question mainly examines the writing of chemical equations, the judgment and selection of oxides, the inspection of oxygen and carbon dioxide produced in the laboratory, the principles of industrial ironmaking, and the removal of rust from dilute sulfuric acid, which is slightly more difficult When writing chemical equations, the chemical formulas of substances must be written correctly, the chemical equations must be balanced, and the reaction conditions and gas precipitation symbols must be accurately marked

Problem Solving Ideas: Only by being familiar with reactants, products and reaction conditions, according to the two principles of the law of conservation of mass, can you write correct chemical equations or arguments Only by being familiar with the concepts and characteristics of basic reaction types can you make correct judgments

1) Carbon dioxide reacts with two oxides, water, to form carbonic acid

The reaction consists of two oxides reacting to produce a substance, which meets the requirements of the title

The chemical equation of this reaction is: CO2 + H2O = H2CO3

2) Potassium permanganate reacts under heating conditions to produce potassium manganate, manganese dioxide and oxygen

The chemical equation for this reaction is: 2kmNO4

k2mno4+mno2+o2↑．

3) Carbon dioxide reacts with calcium hydroxide to form calcium carbonate precipitate and water

The chemical equation of this reaction is: CO2 + Ca(OH)2 = CaCO3 + H2O

4) Carbon monoxide reacts with iron oxide at high temperatures to form iron and carbon dioxide

The chemical equation of this reaction is: 3CO+Fe2O3

High temperature 2Fe+3CO2 shirt is missing.

5) Iron oxide reacts with dilute sulfuric acid to form iron sulfate and water

The chemical equation of this reaction is: 3H2SO4+FE2O3=FE2(SO4)3+3H2O

Therefore, the answer is: 1) CO2 + H2O = H2CO3

2）2kmno4

k2mno4+mno2+o2↑

3）co2+ca（oh）2=caco3↓+h2o

4）3co+fe2o3

High temperature 2Fe+3CO2

5）3h2so4+fe2o3=fe2（so4）3+3h2o

2. Write the chemical equation about the reaction according to the following requirements:

1) There are two kinds of oxides involved in the chemical reaction

2) Oxygen from potassium permanganate 2kmno 4 k 2mno 4+mno 2+o 2 kmno 4 k 2mno 4+mno 2+o 2 ;

3) Test carbon dioxide gas with clarified lime water

4) The reaction of smelting iron metal in industry 3CO+FE2O3 high temperature2Fe+3Co2 3Co+Fe2O3 High Temperature 2fe+3co 2 ；

5) Remove rust from iron products with dilute sulfuric acid

(1) There is a neutralization reaction of precipitate formation: CuCl2+2NaOH=Cu(OH)2+2NaCl

2) There is a chemical reaction of alkali formation: Ba(OH)2+Na2CO3=2NaOH+BACO3

3) The simplest combustion of organic matter: CH4 + 2O2 = CO2 + 2H2O (4) Combustible oxide: Na2O

5) The acid contained in gastric juice: HCl

6) Salt for making building materials: caco3

Copper and oxygen Electrolysis of water Wood Carbon and bond silver or oxygen Phosphorus and oxygen Iron and oxygen Hydrogen peroxide splitting.

Zn+H2SO4=ZNSO4+H2 (upper arrow) C+2CuO(High temperature)=CO2 (upper arrow)+2CuCO2+Ca(OH)2=CaCO3 (lower arrow)+H2O2MG+CO2(ignition)=2MGO+C

NaOH+Cu(OH)2=Cu(OH)2 (down arrow)+Na2SO4FE+CuSO4=FeSO4+Cu

Sodium chlorite reacts with chlorine gas to form chlorine dioxide and sodium chloride 2Naclo2 + Cl2==2Cl2 +2NaCl Sodium carbonate reacts with barium chloride to form barium carbonate precipitate and sodium chloride Na2CO3 + BaCl2==BaCO3 +2NaCl Sodium carbonate reacts with dilute hydrochloric acid to produce sodium chloride, water and carbon dioxide Na2CO3 + 2HCl = = 2NaCl + H2O + CO2 Water reacts with calcium peroxide to produce oxygen and calcium hydroxide.

2cao2+2h2o==2ca(oh)2+o2↑n(o2)=

2cao2+2h2o==2ca(oh)2+o2↑144 1

2*x144/2x = 1/

x = so the mass fraction of calcium peroxide in the sample is 72%.