How to judge the number of electrons transferred in a chemical reaction

After the trim equation, look at the valency change.

Observe how many moles of electrons are transferred for each mole of the redox reaction, and then multiply this value by how many moles the chemical reaction takes place.

The valency of each element is marked in the chemical carry-on equation, and then the number of transferred electrons is judged by the change of valency before and after the reaction.

The change in valency is multiplied by the foot code of the element that is varied and then multiplied by the number of measurements before the chemical formula.

For example, iron and chlorine gas reflect the formation of ferric chloride, iron increases the trivalent, the number of the front is 2, and the number of electrons transferred is 2*3e=6e.

The movement of electrons between two atoms or other chemical substances like molecules, etc. Electron transfer is a redox reaction that changes the oxidation state of two reactants.

Number of electrons transferred = number of electrons lost by reducing agent = number of electrons gained by oxidant.

2al+6hcl====2alcl₃+3h₂

For example, in this reaction, the number of electrons transferred = the number of electrons lost in aluminum = h + the number of electrons gained.

Aluminum lost electron number: One aluminum atom loses three electrons to become aluminum ion, two aluminum atoms lose six electrons to become two aluminum ions, aluminum lost electron number = 6

H+ Electron Number: Two hydrogen ions get 2 electrons to become one hydrogen molecule, six hydrogen ions get 6 electrons to become 3 hydrogen molecules, H+ gets electron number = 6

The number of electrons is the number of electrons. An electron is a fundamental particle, and in chemistry, the number of electrons generally refers to the number of electrons outside the nucleus of an atom or ion.

Total number of transferred electrons = total number of electrons obtained from oxidant = reducing agent.

Total number of lost electrons.

For example, the total number of electrons lost by hydrogen in 2H2+O2=2H2O is 4E-, and the total number of electrons obtained by oxygen is 4E-, so the total number of electrons transferred is 4E-

Taking 2HCl+Zn=ZnCl2+H2 as an example, it is known that 1mol of zinc participates in the reaction, and the zinc element is converted into zinc ions, and two electrons are lost, then the number of electrons transferred is 1mol multiplied by 2=2mol, that is, the number of electrons transferred by a substance multiplied by the amount of a substance.

Number of electrons transferred = number of electrons lost by reducing agent = number of electrons gained by oxidant.

2al+6hcl===2alcl3+3h2

For example, in this reaction, the number of electrons transferred = the number of electrons lost in aluminum = h + the number of electrons gained.

Aluminum lost electron number: One aluminum atom loses three electrons to become aluminum ion, two aluminum atoms lose six electrons to become two aluminum ions, aluminum lost electron number = 6

H+ Electron Number: Two hydrogen ions get 2 electrons to become one hydrogen molecule, six hydrogen ions get 6 electrons to become 3 hydrogen molecules, H+ gets electron number = 6

The atom, the basic unit of matter, is made up of electrons, neutrons, and protons. Neutrons are not charged, protons are positively charged, and atoms are not electrically charged to the outside. Relative to the nucleus of neutrons and protons, the mass of electrons is extremely small.

The mass of a proton is about 1840 times that of an electron.

When electrons are free from their nuclei and move freely in other atoms, the net flow phenomenon is called an electric current.

The ability of various atoms to bind electrons is different, so they become positive ions due to the loss of electrons, and become negative ions when they gain electrons.