The difference between chemical dissolution reaction and chemical reaction in the third grade.

Defuse the reaction? Is it a decomposition reaction Decomposition reaction, which is one of the common types of chemical reactions, is the reverse reaction of chemical reactions. It refers to the decomposition of a compound into two or more simple elements or compounds under specific conditions (such as heating, direct current, catalyst, etc.), which is called a decomposition reaction Chemical reaction refers to the reaction of two or more substances to produce a new substance.

When remembering, it can be recorded as "changeable one") Chemical reactions are generally accompanied by luminescence, heat release and other energy release phenomena. According to this definition, the chemical reactions that are exposed to in junior high school chemistry are as follows: 1 Metals Oxygen Metal oxides Many metals can be directly combined with oxygen.

For example, when the common metal aluminum comes into contact with air, a dense oxide film can be immediately formed on its surface, which can prevent the inner layer of aluminum from being oxidized. 4Al+3O2===(ignition) 2Al2O3 2 Non-metal Oxygen Non-metallic oxide After ignition, many non-metals can be burned in the air, such as: Ignition C+O2—— CO2 3 Metal Non-metal Oxygenate Many metals can be directly combined with non-metallic chlorine, sulfur, etc. to synthesize anoxic.

Such as ignition Na+Cl - NaCl 4 hydrogen Non-metallic gaseous hydride Because the nature of hydrogen is relatively stable, the reaction generally needs to be carried out under ignition or heating conditions. For example, ignition 2H2+O2 - 2H2O 5 alkaline oxide water alkali Most alkaline oxides cannot be directly combined with water. To judge whether an alkaline oxide can be directly combined with water, the general method is to look at the solubility of the corresponding alkali, and if the corresponding alkali is soluble or slightly soluble, the alkaline oxide can be directly combined with water.

For example, the alkali corresponding to Na2O+H2O—— 2NaOH2 is insoluble, and the alkaline oxide cannot be directly combined with water. For example, Cuo and Fe2O3 cannot be directly combined with water.

6 Acidic oxides Water Oxygenated acids With the exception of SiO2, most acidic oxides can be directly combined with water to synthesize oxygenated acids. Such as: CO2+H2O—— H2CO3 7 Basic Oxides Acidic Oxides Oxygenates Na2O+CO2—— Na2CO3 Most basic oxides and acidic oxides can carry out this reaction.

The stronger the alkalinity corresponding to the alkaline oxide, and the stronger the acidity corresponding to the acidic oxide, the easier the reaction will be. Such as: KOH+HCl—— KCl+H2O8 ammonia acid ammonium salt Ammonia is easy to be acidified to synthesize ammonium salt.

Such as: NH3+HCl—— NH4Cl 9Sulfur dioxide is formed when sulfur and oxygen are re-ignited 10 In addition to the above types of chemical reactions, the following chemical reactions are also exposed to in junior high school chemistry.

The formula is: a+b+c+.d If it's okay, go to the encyclopedia.

The decomposition reaction is a polymorphic chemical reaction that is polymorphic one.

c+o2=co2

2h2+o2=2h2o

2mg+o2=2mgo

There are a lot of them like this, mainly reacting with O2.

Carbonate is added with acid to produce water and carbon dioxide.

Acid-base neutralization reaction in junior high school chemistry experiments.

1. Hydrochloric acid and caustic soda react: HCl+Naoh==NaCl+H2O

2.Hydrochloric acid and potassium hydroxide reaction: HCl+KOH==KCl+H2O

3 Hydrochloric acid and copper hydroxide reaction: 2HCl+Cu(OH)2==CuCl2+2H2O

4.Hydrochloric acid and calcium hydroxide reaction: 2HCl + Ca(OH)2==CaCl2+2H2O

5.Hydrochloric acid and iron hydroxide reaction: 3HCl + Fe (OH) 3 = = FeCl3 + 3H2O

6.Aluminum hydroxide drug**Hyperacidity: 3HCl + Al(OH)3==ALC3+3H2O

7.Sulfuric acid and caustic soda reaction: H2SO4 + 2NaOH = = Na2SO4 + 2H2O

8.Sulfuric acid and potassium hydroxide reaction: H2SO4 + 2KOH = = K2SO4 + 2H2O

9.Sulfuric acid and copper hydroxide reaction: H2SO4 + Cu(OH)2==CuSO4 + 2H2O

10.Sulfuric acid and iron hydroxide reaction: 3H2SO4 + 2Fe(OH)3==Fe2(SO4)3+ 6H2O

11.Nitric acid and caustic soda reaction: HNO3 + NaOH = = nano3 + H2O

Carbon burning in the air, hydrogen reduction of copper oxide to copper, and the water dust chain of Paichunsun

In junior high school, oxidation reaction refers to the reaction between a substance and oxygen (not only oxygen, but oxygen), which is called oxidation reaction. So, the oxidation reaction can be a chemical reaction or it may not be a chemical reaction. For example:

Carbon is burned in the air to produce carbon dioxide, which is an oxidation reaction and a chemical reaction. The reduction of copper oxide by hydrogen to copper and water is an oxidation reaction, but it is not a chemical reaction. Therefore, there is no necessary connection between oxygen reaction and chemical reaction reaction, but there is a difference.

A chemical reaction is a chemical reaction in which two or more substances undergo a chemical reaction to produce a substance, which is called a chemical reaction.

co2+h2o=h2co3

cao+h2o=ca(oh)2

The chemical reaction between the two compounds does not belong to the oxidation reaction in a broad sense.