Abbreviation for common chemical elements in chemical equations. SUCH AS IRON FE!

Hydrogen H, Helium HE, Lithium Li, Beryllium BE, Boron B, Carbon C, Nitrogen N, Oxygen O, Fluorine F, Neon Neon, Sodium Na, Magnesium MG, Aluminum Al, Silicon Si, Phosphorus P, Sulfur S, Chlorine Cl, Argon Argon, Potassium K, Calcium Ca, Scandium SC, Titanium Ti, Vanadium V, Chromium Cr, Manganese MM, Iron Fe, Cobalt Co, Nickel Ni, Copper Cu, Zinc ZN, Gong Hg, Silver AG, Gold Au

Iron should not be burned in hydrogen, iron and hydrogen generally show reducibility, iron and hydrogen may react under special conditions, but they will not be combusted.

If you say that the chemical equation for the reaction of iron and hydrogen is.

fe+h2=feh2

At this time, hydrogen is -1 valence.

But I haven't heard of iron reacting with hydrogen, I've only heard of sodium reacting with hydrogen.

If a reducing agent can react with hydrogen, then the reducing agent should be very reducible, just like sodium is very reducible, so sodium will react with hydrogen under heating conditions, if the reducing agent is not strong, then the reaction is not easy to continue.

The element symbols that need to be mastered in junior high school are:

1 No. 20.

H hydrogen. HE helium.

Lithium. Beberlium.

b boron. c carbon.

n Nitrogen. o Oxygen.

F fluorine. neon.

Na sodium. mg magnesium.

al aluminum. Si silicon.

P phosphorus. Sulphur.

Cl chlorine. argon.

K potassium. CA Calcium.

The rest is also: Fe iron.

Cu copper. Au gold.

pt platinum. AG Silver.

There is a difference between O and O2, O refers to oxygen atoms, and O2 refers to oxygen or oxygen molecules. The 2 in the lower right corner indicates that there are 2 atoms in the molecule.

The element symbols that need to be mastered in junior high school are:

1 No. 20.

1 h hydrogen.

2 he helium.

3 li lithium.

4 be beryllium.

5 b Boron.

6 c carbon.

7 n nitrogen.

8 o Oxygen.

9 F fluorine.

10 ne neon.

11 na sodium.

12 mg magnesium.

13 al Aluminum.

14 si silicon.

15p phosphorus.

16 s sulfur.

17 cl chlorine.

18 ar argon.

19 k potassium.

20 ca calcium.

And the rest are:

Fe iron. Cu copper.

Au gold. pt platinum.

Ag Silver There is a difference between O and O2, O refers to the oxygen atom and O2 refers to oxygen or oxygen molecules. The 2 in the lower right corner indicates that there are 2 atoms in the molecule.

Hydrogen H, Helium HE, Lithium Li, Beryllium BE, Boron B, Carbon C, Nitrogen N, Oxygen O, Fluorine F, Neon Neon, Sodium Na, Magnesium MG, Aluminum Al, Silicon Si, Phosphorus P, Sulfur S, Chlorine Cl, Argon Argon, Potassium K, Calcium Ca, Scandium SC, Titanium Ti, Vanadium V, Chromium Cr, Manganese MM, Iron Fe, Cobalt Co, Nickel Ni, Copper Cu, Zinc ZN, Gong Hg, Silver AG, Gold Au

O represents the oxygen element or a single oxygen atom, and O2 is the product of the combination of two oxygen atoms - oxygen, which is a molecule.

From the position of the elements in the periodic table, it can be seen that they are Na, K, Mg, Ca, Al, C, O, Cl, Br, Ar, F, 1) The outermost layer of the noble gas is a stable structure, so the chemical properties of Ar are the least active, so the answer is: Ar;

2) The non-metallicity of the same period weakens from left to right, and the metallicity of the same main group is enhanced from top to bottom, so the metallicity K na al, the stronger the metallicity, the stronger the alkalinity of the hydrate corresponding to the most ** oxide, the strongest alkalinity of KOH, so the answer is: KOH;

3) The element is O, the hydride is H2O, and at room temperature it reacts with K and water to form KOH and hydrogen, and the reaction equation is: 2K+H2O=2K++2OH-+H2, so the answer is: H2O; 2k+h2o=2k++2oh-+h2↑；

4) The compound formed by Na and BR is NABR, which contains Na element, and the flame color is yellow when burning, so the answer is: NaBR; Yellow;

5) Aluminum hydroxide reacts with sodium hydroxide to form sodium metaaluminate and water, and the reaction equation is: Al(OH)3+NaOH Naalo2+2H2O, so the answer is: Al(OH)3+NaOH Naalo2+2H2O

fecu

mgo o2

The P2O5CO2 element symbol is usually represented by the first letter (uppercase) of the Latin name of the element, and if the first letter of several element names is the same, a lowercase letter can be added to distinguish it; According to the writing of the chemical formula of oxides: oxygen is on the right, another element is on the left, the number of atoms of each element is marked in the lower right corner, and the number of atoms can also be determined according to the valency algebra and zero

The symbol of the iron element is Fe; The copper element symbol is cu; Magnesium is +2 valence, oxygen is -2 valence, so the chemical formula of magnesium oxide is: MGO; Oxygen is made up of diatomic molecules, so the chemical formula of oxygen is O

2；The chemical formula of phosphorus pentoxide is P2O

5；The chemical formula of carbon dioxide is CO2.

feh2

so2fesfes2

fe2s3feo

fe2o3fe3o4

h2sh2o

h2o2so2

so3feso4

fe2(so4)3

feso3h2so4

h2so3feso4

7h2ofe(oh)2

fe(oh)3

Yu Fan guessed that the sedan track couldn't even seep out the subscript!

(1) The Al atom has 3 electron shells, and the number of electrons in the outermost shell is 3, which is in the third period A group in the periodic table, so the answer is: the third period A group;

2) The hydride of a certain element and the most advanced oxygen-containing acid of the element can react to form salt, then the element is the element N, the laboratory uses calcium hydroxide and ammonium chloride to prepare ammonia under heating conditions, and at the same time generates calcium chloride and water, the reaction equation is: Ca(OH)2+2NH4Cl

CaCl2+2NH3 +2H2O, so the answer is: Ca(OH)2+2NH4Cl

cacl2+2nh3↑+2h2o；

3) the smallest h atomic radius of all elements; f element is the most non-metallic; Si can be used in chip manufacturing, so the answer is: H; f；si；

4) If A is composed of two elements, it is liquid at room temperature, and the element that makes up elemental B is the largest atomic radius in a short period, then B is Na, A is H2O, and combined with the transformation relationship, it can be seen that C is sodium hydroxide, D is hydrogen, and E is oxygen, then the equation of the reaction is: 2Na+2H2O=2NaOH+2H2, so the answer is: 2Na+2H2O=2NaOH+2H2;

If B is the elemental element with the highest content of metal elements in the earth's crust, then B is Al, E is water, the reaction between D and E is carried out at high temperature, and the reaction between D and E is thermite reaction, then A is ferric oxide, C is alumina, D is Fe, and the chemical formula of A is Fe3O4, so the answer is: Fe3O4;

If B is a positive salt, its flame color reaction is yellow, containing Na element, and yellow-green gas A is introduced into the solution of B, and a yellow precipitate appears, it can be inferred that A is chlorine and B is Na2S, and the ion equation of the reaction is S2-+Cl2=S +2Cl-, so the answer is: S2-+Cl2=S +2Cl-

Fe with acid:

Fe + 2HCl = FeCl2 + H2 Fe + H2SO4 = FeSO4 + H2 2Fe + 6H2SO4 (concentrated) == == Fe2(SO4)3 + 3SO2 +6H2O

Fe + 4Hno3 (dilute) = Fe(No3)3 + No + 2H2O

Fe + 6Hno3 (concentrated) == == Fe(NO3)3 + 3NO2 +3H2O

Fe with salts: Fe + Cuso4 = Feso4 + Cufe with oxidizing substances:

3Fe + 2O2 == Ignition == Fe3O42Fe + 3Cl2 == Ignition == 2FeCl3Fe with Water: 3Fe + 4H2O = Fe3O4 + 4H2 Conversion of ferric iron to ferric iron:

2f2+ +cl2 = 2fe3+ 2cl-2fe3+ fe = 3fe2+

Identification of ferric ions.

Fe3+ +3SCN- = Fe(SCN)3Fe2+ +2OH- = Fe(OH)2 Fe3+ +3OH- = Fe(OH)3 Smelting of iron:

3CO+Fe2O3==High temperature== 2Fe+3CO2

1) B and C are elemental, B and C can react to produce Y, Y can generate B and C, then Y may be water, B and C may be hydrogen and oxygen, A is elemental, can generate B, then A may be iron, B is hydrogen noisy gas, C is oxygen, X is a compound, can generate A, then X may be carbon monoxide, so the answer to this question is: stupid mountain iron; h2

2) According to the inference, B is hydrogen, C is oxygen, the reaction between B and C is the reaction of hydrogen and oxygen, X is carbon monoxide, A is iron, carbon monoxide can react with oxygen to iron to form iron, so the answer to this question is: 2H2O2 ignites.

2h2o；②fe2

O33CO high temperature.

2fe+3co2

So the answer is: 1) iron; h2

2) 2H2O2 ignition.

2h2o；fe2o3

3CO high temperature.

2fe+3co2