High School Chemistry Compulsory 1 Formula Classification, High School Compulsory 1 Chemical Equatio

Displacement reaction is a chemical reaction in which an element reacts with a compound to form another element and a compound, and any displacement reaction belongs to a metathesis reaction, including the reaction between metals and metal salts, and the reaction between metals and acids. For example, iron and sulfuric acid react to form iron sulfate and hydrogen.

Decomposition reaction, which is one of the common types of chemical reactions, is the reverse reaction of chemical reactions. It refers to the reaction in which a compound is broken down into two or more simple elements or compounds under specific conditions (such as heating, direct current, catalyst, etc.). For example, sodium bicarbonate is heated to produce carbon dioxide, sodium carbonate and water.

The reaction in which two compounds exchange components with each other to form two other compounds is called metathesis. Its essence is: the two substances that undergo metathesis reaction exchange ions with each other in the aqueous solution, and combine into substances that are difficult to ionize--- precipitation, gas, and water, so that the ion concentration in the solution is reduced, and the chemical reaction is carried out in the direction of the reduction of ion concentration.

It can be abbreviated as ab cd = ad cb. For example, silver nitrate reacts with hydrochloric acid to produce nitric acid and white precipitated silver chloride that is insoluble in nitric acid.

Redox reaction is a chemical reaction in which the valency of an element before and after the reaction has a corresponding rise and fall change. A chemical reaction in which there is a change in the valency of an element during the reaction is called a redox reaction. This reaction can be understood as consisting of two halves, namely oxidation and reduction.

All such reactions observe conservation of charge. In redox reactions, oxidation and reduction must be carried out in equal quantities at the same time.

There are many such reactions, such as the displacement reaction, which is a redox reaction.

Organic reactions, i.e., chemical reactions involving organic compounds, are the basis of organic synthesis. The basic types of reactions are: addition, elimination, substitution, pericyclic reaction, rearrangement reaction, and redox reaction.

Chemical reaction: multi-change one, decomposition reaction: one becomes many displacement reaction: elemental and compound reaction to form new elemental and new compounds, metathesis reaction: two compounds exchange components with each other to form two new compounds.

Compounding reaction: a+b=c

Decomposition reaction: c=a+b

Displacement reaction: elemental + compound = another elemental + another compound.

Metathesis reaction: A+B=C+D, where gases, precipitates, or weak electrolytes (e.g., water) must be formed and ABCD is a compound.

Redox reaction: a+b=c+d, the elements with increased valency undergo oxidation reactions, and the elements with reduced valency undergo reduction reactions, and these two reactions exist in the same chemical reaction. Redox reactions are not the basic type of reactions. ）

All of the above are good, and you take the four types of reactions and find corresponding examples in the textbook.

For example, h2+o2=h2o, which is the chemical reaction, and then you can put together the equation that you learned like a+b=c.

Why isn't the other (and that's a very strict definition) because you can see it when you compare it, so what other type does it belong to? And then put the rest neat.

Don't worry, not now, probably just getting into chemistry, it's normal to start a little struggling, take more time on your own, memorize concepts, look for examples, and you'll remember it quickly (what classification you encounter in the future, it's very effective to remember it like this) Hehe, come over.

They've all said it all...

Let's do more questions on your own, I think it will be more understandable.

1. Reaction between sodium oxide and acid: Na2O+2HCl=2NaCl+H2O

2. The chemical equation of sodium metal and hydrochloric acid: 2Na+2HCl=2NaCl+H2

3. Reaction between sodium peroxide and acid: 2Na2O2+4HCl=4NaCl+2H2O+O2

4. The chemical equation of sodium metal and hydrochloric acid: 2Na+2HCl=2NaCl+H2

5. The reaction equation between chlorine and iron: 2Fe + 3Cl2 = 2FeCl3

6. Turbid lime water becomes clear: CO2 + CAC3 + H2O = CA (HCO3) 2

7. Sodium bicarbonate is easy to decompose when heated: 2NaHCO3 = Na2CO3 + CO2 + H2O

8. Reaction between ammonia and hydrochloric acid: NH3+HCl=NH4Cl

9. Industrial production of water and gas: C+H2O(G)=Co+H2

10. Thermal decomposition of ammonium chloride: NH4Cl=NH3 + HCl

1. Iron and water vapor reaction: 3Fe + 4H2O (G) = F3O4 + 4H2

2. Reaction between aluminum and sodium hydroxide solution: 2Al + 2NaOH + 2H2O = 2Naalo2 + 3H2

3. Calcium oxide reacts with water: CaO+H2O=Ca(OH)2

4. Iron oxide reacts with hydrochloric acid: Fe2O3+6HCl=2FeCl3+3H2O

5. Reaction between alumina and hydrochloric acid: Al2O3+6HCl=2ALC3+3H2O

6. Reaction between alumina and sodium hydroxide solution: Al2O3+2NaOH=2Naalo2+H2O

7. Reaction of ferric chloride with sodium hydroxide solution: FeCl3 + 3NaOH = Fe (OH)3 + 3NaCl

8. Ferrous sulfate reacts with sodium hydroxide solution: FeSO4 + 2NaOH = Fe(OH)2 + Na2SO4

9. Ferrous hydroxide is oxidized to iron hydroxide: 4Fe(OH)2+2H2O+O2=4Fe(OH)3

10. Thermal decomposition of iron hydroxide: 2Fe(OH)3 Fe2O3+3H2O

1. Sulfur dioxide reacts with water: SO2+H2O H2SO3

2. Nitrogen and oxygen react under discharge: N2+O2 discharges 2NO

3. Nitric oxide reacts with oxygen: 2NO+O2=2NO2

4. Nitrogen dioxide reacts with water: 3NO2+H2O=2HNO3+NO

5. Sulfur dioxide reacts with oxygen under the action of catalyst: 2SO2 + O2 catalyst 2SO3

6. Sulfur trioxide reacts with water: SO3 + H2O = H2SO4

7. Concentrated sulfuric acid reacts with copper: Cu + 2H2SO4 (concentrated) CuSO4 + 2H2O + SO2

8. Concentrated sulfuric acid reacts with charcoal: C+2H2SO4 (concentrated) CO2 +2SO2 +2H2O

9. Hydrochloric acid reacts with silver nitrate solution: HCl + AGnO3 = AGCL + HNO3

10. Bleaching powder is exposed to the air for a long time: Ca(CLO)2+H2O+CO2=CAC3 +2HCO

n=n/na=m/m=v/vm=cv

At the same temperature and pressure, for gas: n1 n2=v1 v2=n1 n2 1 2=m1 m2

At the same temperature and capacity, for gas: p1 p2 = n1 n2 solution dilution rule c (concentrated) v (concentrated) = c (dilute) v (dilute).