Phenomena and chemical equations of the reaction of metals with acids

1) By analyzing the reaction phenomena and activities of magnesium, zinc, iron, copper and acids, it can be known that the metal phenomenon is the chemical equation of the reaction.

Hydrochloric acid or dilute sulfuric acid.

Hydrochloric acid dilute sulfuric acid magnesium reacts violently, produces a large number of bubbles, the solution is still colorless mg+2HCl=mgCl2 +H2 mg+H2 SO4 =mgSO4 +H2 Zinc The reaction is not too violent, bubbles are produced, and the solution is still colorless Zn+2HCl=ZNCL 2 +H2 Zn+H2 SO4 =ZNSO 4 +H2 Iron The reaction is slow, bubbles are produced, and the solution changes from colorless to light green FeCl+2HCl=FeCl 2 +H2 Fe+H2 SO4 =FeSO4 +H2 Copper does not react 2) Through the comparison of experimental phenomena, it can be seen that the order of activity of the four metals of magnesium, zinc, iron and copper is: magnesium zinc and iron copper Therefore, the answer is: (1) The chemical equation of the metal phenomenon reaction hydrochloric acid or dilute sulfuric acid hydrochloric acid dilute sulfuric acid magnesium violently, a large number of bubbles mg+2HCl=mgCl 2 +H2 mg+H2 SO4 =mgSO4 +H2 zinc is not too violent, bubbles zn+2HCl=zNCL 2 +H2 zn+H2 SO4 =ZNSO 4 +H2 iron slow, Bubbles, light green FeCl+2HCl=FeCl2 +H2 Fe+H2 SO4=FeSO4 +H2 Copper Non-reactive (2) Magnesium >> Zinc >> Iron>> Copper

Chemical experiments Acids react with metal oxides.

An example of the chemical equation for the reaction of a metal and an acid is as follows:

1), Mg+2HCl=MgCl2+H2 (2), Zn+H2SO4=ZnSO4+H2 (3), Fe+4HNO3 (dilute) = Fe(NO3)3+NO+2H2O

There are many reactions of acids with metal oxides, and here are five of them:

1、fe3o4+8hcl==2fecl3+fecl2+4h2o；

2、zno+2hcl==zncl2+h2o；

3、al2o3+6hno3==2al(no3)3+3h2o；

4、fe2o3+3h2so4==fe2(so4)3+3h2o；

Wild Chong 5, MGO+H2SO4==MGSO4+H2O.

The acid reacts with metal oxides to form the corresponding salts and water. Among them, acid is a chemical compound, and the cations that ionize in an aqueous solution are all hydrogen ions. Metal oxide is a compound composed of metal elemental san slast and oxygen elements, including acid oxides, alkaline oxides, etc., which are generally solid at room temperature.

In chemistry, salt refers to a metal ion or a compound that combines ammonium ions with acid ions, and salts can be divided into single salts and combined salts. The ridge is thick.

The chemical equation for the reaction of metals and acids: 2Na + 2H2O = 2NaOH + H2.

Chemically, acid refers to compounds that are hydrogen ions produced when ionized in an aqueous solution, and can be divided into inorganic acids and organic acids. According to the acid-base proton theory, substances that can release protons are collectively called acids.

Lewis acid-base theory holds that either electrophiles or electron acceptors are Lewis acids.

Chemical equation for the reaction of metals with acids:

1. Metal element + salt (solution) - another metal + another salt.

Iron reacts with copper sulfate: Fe+CuSo4==Cu+FeSo4.

Phenomenon: The surface of the iron bar is covered with a layer of red substance, and the solution changes from blue to light green.

The ancient wet method of copper and "Zeng Qing got iron and turned copper" refers to this reaction).

Zinc tablets are placed in copper sulfate solution: CuSO4+ZN==ZNSO4+CU.

Phenomenon: The surface of the zinc sheet is covered with a layer of red substance, and the solution turns from blue to colorless.

Put the copper sheet in silver nitrate solution: 2agNO3+Cu==Cu(NO3)2+2AG.

Phenomenon: The surface of the copper sheet is covered with a layer of silvery-white substance, and the solution changes from colorless to blue.

2. Metal oxides, charcoal or hydrogen, metals, carbon dioxide or water.

Coke reduced iron oxide: 3C+2Fe2O3==High temperature 4Fe+3CO2.

Charcoal reduced copper oxide: c+2cuo==high temperature 2cu+CO2.

Phenomenon: The black powder does not turn red, and the clarified lime water becomes turbid.

1. Zinc reaction with dilute hydrochloric acid: Zn+

2hclzncl2+h2

Bubbles are formed, and the zinc particles gradually decrease.

2. Zinc reaction with dilute sulfuric acid: Zn+

h2so4znso4+h2

3. Iron reacts with dilute hydrochloric acid: Fe+

2hclfecl2+h2

There are bubbles produced and the iron gradually decreases.

4. Iron reacts with dilute sulfuric acid: Fe+

h2so4feso4+h2

The solution turns light green.

5、al+3h2so4

al2(so4)33h2al

6hcl2alcl3

3h2↑