Equations for various chemical reactions, 150 points are added if you are in a hurry

1 Metal + Oxygen Metal oxide (or basic oxide) Magnesium burns in air: 2mg + O2 ignition 2mgo Iron burns in oxygen: 3Fe + 2O2 ignition Fe3O4 Copper heats in air:

2Cu + O2 Heating 2Cuo 2 Metal + Acid Salt + Hydrogen Zinc and dilute sulfuric acid Zn + H2SO4 = ZnSO4 + H2 Iron and dilute sulfuric acid Fe + H2SO4 = FeSO4 + H2

Solution: These chemical formulas do not react with each other.

Here are some similar chemical reactions:

Fe can react with FeCl3.

Fe+2FeCl3==3FeCl2 (this reaction is used to prevent the deterioration of FeCl2 solution into FeCl3).

Fe and CuO2 can react with HCL2.

fe+2hcl==fecl2+h2↑

cuo+2hcl==cucl2+2h2o

Cu(OH)2 and BaCl2 can react with H2SO4 Cu(OH)2+H2SO4===CuSO4+2H2OBACl2+H2SO4==BaSO4 +2HCl (refractory volatile acids to volatile acids).

Solution: Copper is a metal that is weak and does not react with non-strong oxidizing acids (e.g., hydrochloric acid) Sulfur dioxide is an acidic oxide that does not react with acids.

It can react with hydrochloric acid: magnesium hydroxide, barium carbonate, sodium oxide, silver nitrate.

The reaction formula is as follows:

mg(oh)2+2hcl=mgcl2+2h2obaco3+2hcl===bacl2+h2o+co2↑na2o+2hcl==2nacl+h2o

agno3+hcl==agcl↓+hno3

Hello, the first question is fe+2hcl===fecl2+h2 cuo+2hcl==cucl2+2h2o

Cu(OH)2+H2SO4===CuSO4+2H2OBaCl2+H2SO4==BaSO4 +2HCl2 Second Q: mg(OH)2+2HCl=MGCL2+2H2OBaCO3+2HCl===BaCl2+H2O+CO2 NA2O+2HCl===2NaCl+H2OAGN3+HCl===AGCL +HNO3 Thank you.

fe+2hcl===fecl2+h2↑

cuo+2hcl==cucl2+2h2o

Cu(OH)2+H2SO4===CuSO4+2H2OBaCl2+H2SO4==BASO4 +2HClMG(OH)2+2HCl=MGCl2+2H2OBaCO3+2HCl===BaCl2+H2O+CO2 NA2O+2HCl===2NaCl+H2OAGNO3+HCL===AGCL +HNO3 Good luck in the exam.

The text above does not react, and the fe+2HCl===feCl2+H2 cuO+2HCL==CuCl2+2H2O

cu(oh)2+h2so4===cuso4+2h2obacl2+h2so4==baso4↓+2hclmg(oh)2+2hcl=mgcl2+2h2obaco3+2hcl===bacl2+h2o+co2↑na2o+2hcl===2nacl+h2oagno3+hcl===agcl↓+hno3

agno3+hcl===agcl↓+hno3mg(oh)2+hcl=mgcl2+h2obaco3+hcl=bacl2+h2o+co2↑cuo+2hcl==cucl2+2h2o

Cu(OH)2+H2SO4===CuSO4 +2H2OFE and FeCl2 do not react in order to prevent oxidation.

cuo +cucl2=

BACl2 + BASO4 == does not react.

Choose AFE+2HCl=FeCl2+H2 where FeCl2 is soluble in water, C does not react with acid and is insoluble in water, and C can be obtained by filtering and washing.

B. Ba(OH)2+2HCl=BACl2+2H2O After the reaction, BaCl2 is also soluble in water, and new impurities are introduced.

c. Soda lime does not react with impurity CO, but reacts with substance CO2. co2+2naoh=na2co3+h2o, co2+cao=caco3

D, Ca(OH)2+K2CO3=CaCO3+2KOH reaction to form KOH is also soluble in water, introducing new impurities.

Choose A. Reason; c does not react with hydrochloric acid. Item B introduces another impurity, item C, CO2 reacts with NaOH, and item D introduces K ions.

I choose AA. fe+2hcl*****h2↑+fecl2b。Ca2+ +2 OH- *****Ca(OH)2 Because Ca(OH)2 has a very low solubility in water, Ca2+ is partially deposited.

c。2NaOH + CO2 ====Na2CO3 + H2O reacts with reagents without reacting with impurities.

d。Ca(OH)2 + K2CO3 ====CaCO3 +2KOH introduces impurities KOH, which does not achieve the purpose of removing impurities.

The answer is a

Fe+2HCl=FeCl2+H2 where FeCl2 is soluble in water, it can be washed away with water, and hydrogen gas runs away. The rest of the c is clean.

b The impurities form BaCl2, which is also soluble in water and cannot be removed. ba(oh)2+2hcl=bacl2+2h2o

c. Soda lime does not react with impurity CO, but reacts with substance CO2. co2+2naoh=na2co3+h2o, co2+cao=caco3

D Ca(OH)2+K2CO3=CaCO3+2KOH A new impurity KOH was introduced

Fe+2HCl=FeCl2+H2O.

Ba(OH)2+2HCl=BACl2+2H2O, the introduction of barium chloride does not work, carbon dioxide will react with sodium hydroxide, and it will not work.

The reaction of calcium hydroxide and potassium carbonate results in the formation of potassium hydroxide, which introduces a new journal A

Choose A. b. HCL is removed after the addition of Ba(OH)2, but BA(OH)2 will react with CaCl2; The mixture of C, CaO, and NaOH will only react with CO2; d. K2CO3 can remove Ca(OH)2, but at the same time, K2CO3 will be introduced, and the final solution is still impure, so it is not compliant.

The choice of AB is mixed with impurities.

c removes CO2.

d is also mixed with impurities.

1. In alkaline solution, +1-valent chlorine (clo-) and -1-valent chlorine (cl-) are more stable than chlorine. Therefore, chlorine gas is prone to disproportionation reaction in alkaline solution.

2. The acidity of carbonic acid is stronger than that of hypochlorous acid, so hypochlorite can react with CO2 and H2O (equivalent to carbonic acid) to obtain hypochlorous acid.

3. Same as question 1.

4. Same as question 2. The fact that hydrochloric acid is more acidic than hypochlorous acid is the essential reason.

5. Same as question 2. The fact that carbonic acid is more acidic than hypochlorous acid is the essential reason.

6. The proposition is incorrect! The yellow-green chlorine color is produced by the Cl2 molecule. It reacts with water only in small amounts to form hydrochloric acid and hypochlorous acid. The main reasons for the yellow-green color disappearance of the NaOH solution are:

2naoh + cl2 = naclo + nacl + h2o

Since the product is colorless, the color of the solution fades. It has nothing to do with the hypochlorous acid molecule.

If the magenta solution is added to fade, it can be proved that this is because the Cl2 molecule can't do it and the HClo molecule can.

Conditional light.

Condition ignition. Conditional catalysts.

Conditional catalysts.

Condition benzene) + Hno3 C6H5-NO2 + H2O condition heating, benzene is best written as a structural formula, because it is not easy to write on the Internet, so it is not written.

benzene) + br2 c6h5br + hbr

Because the generated HBR is not obvious, so there is no need to carry a gas symbol, because many reactions are related to temperature and the amount of matter, so some reactions are not unique, I only wrote the main one, if there is a mistake, please understand, for the sake of hard work, right!

light) ch3cl

br2__ch2brch2br.

3O2 (ignited) 2CO2

h2o__ch3ch2oh.

o2_(cu)_2ch3cho

2na__2c3h7ona

hno3_(h2so4)_c6h5no2

br2_(febr2)_c6h5br

HBR should be that, and there may be something wrong.

The existing mixture of iron and copper is put into hydrochloric acid with a mass fraction, and the two are just completely reacted. (Copper does not react with hydrochloric acid and is not soluble in water).

1) The mass fraction of copper in a mixture of iron and copper.

2) The mass fraction of the solute in the solution after the reaction.

na2co3 + 2hcl === 2nacl + h2o + co2↑

HCl + NaOH ==== NaCl + H2O According to the equation, it can be seen that NaOH and Na2CO3 react with hydrochloric acid, and the mass ratio of sodium to chlorine can be seen according to the chemical formula of NaCl, so the mass of sodium can be solved according to the quality of chlorine

HCL mass 100 grams

CL quality.

na：cl=23：

The solution is x=na%=

It's simple, and the format is not so good for me to write, and it's time-consuming. It's good to give you an idea, so that you can do it later.

1. That is to say, CO2 is.

CaCO3 = High temperature = CO2 + CAO

1) Number of moles = mass of molar mass. Calculate the number of moles of caco3 and then you can calculate the mass of caco3, divide the obtained mass by the total mass, and you get the answer.

2. Zn+H2SO4=ZNSO4+H2 (gas standard).

1) Find the molar number of zn, then you can know the molar number of h2, and you can also find the h2 mass according to the above question (2).

2) In the same way, in question 1 (2), find the mass of sulfuric acid, and divide it by 100ml (you are wrong).

3) In the same way, find the mass of ZnSO4, divide by 100ml, and it's OK.

It's not difficult, and it's all the same method, read the textbook carefully, there are examples in the book.

3. According to the trilogy method, this one is too troublesome to write, I don't want to write it, and there are example questions in the book.

4、caco3+2hcl=cacl2+co2

1) Find the number of moles, you can find the answer, according to the above questions teach you to do.

2) Find the number of moles of hydrochloric acid with a mass fraction of 100%, and then find the mass, and then I don't need to teach you.

3) The solute after the reaction is CaCl2, so find the number of moles of CaCl2, then you can get its mass, and then divide by the answer obtained in question 2, and that's all OK.

To sum up, these questions are basically done in one way, you read the book yourself, and ask the teacher if you don't understand. Once you've found a pattern, you'll feel like it's nothing.

1.Solution: (1) Because the decomposed carbon dioxide runs into the air, subtracting the remaining amount by the total mass is the amount of carbon dioxide generated.

The mass of carbon dioxide m =

2）caco3=cao+co2

From the chemical equation, it can be seen that 1molcaCO3 produces 1molCO2, so the mass of calcium carbonate is:

The mass fraction was;

2 Solution: (1) H2SO4+Zn=Zns04+H298 65 2Y 13 x Zinc is completely reacted in this problem.

According to the equation, the mass of hydrogen is x=2*13 65=(2) Because 1mol of dilute sulfuric acid consumes 1mol of zinc, the amount of their substances is equal, i.e. The amount of substances of dilute sulfuric acid is: y=13g 65g mol=so the mass fraction is:

3) The amount of zinc sulfate produced by the reaction is:

Then the mass fraction of the solute in the solution is:

3.Solution (1) 2Fe+6HCl=2FeCl3+3H256*2 6* 3*2x 100* Y yields x=56*2*100*

So the mass fraction of iron is.

The mass fraction of copper is:

2) The total mass of the solute in the mixed solution is 10+100*The mass of the hydrogen produced is y=3*2*100*

So the mass of the solute in the mixed solution is (

4.Solution: (1) CaCO3+2HCl=CaCl2+CO2+H2O100 2*44 18

x y zx=（2）y=2*

So the quality of the hydrochloric acid solution is.

3) Then the mass fraction of solute solute in the solution after the reaction is (x+ 96%.