How can we see how many electrons are transferred in the chemical reaction equation?

Answer: the essence of the chemical equation is the gain and loss of electrons. The increase or decrease of chemical and valence represents the gain and loss of electrons. For example, 2 H2 + O2 = 2H2O. In the reactant, both H2 and O2 have zero valence. In the product, H becomes negative 1 valence and o becomes positive 2 valence. That is to say, both h and O transfer four electrons (the chemical and valence of hydrogen is positive 1 valence, hydrogen is composed of two hydrogen atoms, and the coefficient before hydrogen in the equation is 2, Therefore, the number of transferred electrons = 2 times 2 times 1 = 4 can also be deduced from oxygen. Oxygen is composed of two oxygen atoms. The coefficient in front of the equation oxygen is 1. The number of transferred electrons = 2 times 1 times 2 = 4). It should be noted that the number of gained and lost electrons in the equation is the first balance, that is, the number of positive and negative electrons, etc; It's a reduction reaction

On the problem of electron transfer in chemical equation
NH4NO3——HNO3+H2O+N2↑
KClO3+HCl——KCl+Cl2↑+H2O
How do the electrons transfer in these two reactions,

5nh4no3 = = 2hno3 + 9h2o + 4n2 ↑ there are three valence changes in the five nitrate radicals, two of which have no change and are converted into nitric acid. The number of transferred electrons: 3NO3 ------ > 3 / 2n2, 3 * 5 = 15 electrons are obtained. 5nh4 + --- > 5 / 2n2, 5 * 3 = 15 electrons are lost, KClO3 + 6hcl = = = KCl + 3cl2 ↑ + H2O KClO3 -

Judgement on the number of electron transfer in the chemical equation of redox reaction in grade one
What I fear most is that the same substance in the chemical formula acts as oxidant or oxidation product, reductant or reduction product
For example: KClO3 + 6hcl = KCl + 3cl2 ↑ + 3H2O
Why does that chlorine have to be divided?
I know that "the loss of oxygen increases. The decrease is still good." but in this question, I don't understand why 6hcl is divided into 1kcl and 5cl2

Have you studied chemical price? If you know that, it's easy
Remember a doggerel, rise lose oxygen, fall still
That is to say, as the valence increases, electrons will be lost, oxidized and used as reducing agent
When the valence is reduced, electrons are obtained, which are reduced and used as oxidants
Most people can use this method to judge the number of transfers: it depends on how much the valence has changed, and then it is multiplied by the coefficient in front of the substance

Multiply a fraction by an integer, using the number of fractions And Product of multiplication , denominator ．

In the calculation method of multiplying a fraction by an integer, the numerator is the product of the numerator of the fraction and the integral, and the denominator is unchanged. Therefore, the answer is: numerator, integer, numerator and invariant

Why is it that the numerator of a fraction is multiplied by an integer, but the denominator does not have to be multiplied by the integer?

This... Because the multiplication rule of fraction multiplied by fraction is: numerator multiplied by numerator, denominator multiplied by denominator. The denominator of integer is 1, so numerator multiplied by integer, denominator multiplied by 1. In those days, paper and pen were expensive, so it was abbreviated as numerator multiplied by integer, denominator unchanged

The product of (1) and (2) of fractions multiplied by integers is used to make (3) and (4) unchanged, and those that can be reduced must be reduced first and then multiplied
Another question:
The multiplication of fraction and fraction is made by the product of molecular multiplication (5) and the product of denominator multiplication (6)
①：②：③：④：⑤：⑥：

① : molecule
② : integer
③ : molecule
④ : denominator
⑤ : molecule
⑥ : denominator

Multiply a fraction by an integer, using the number of fractions And Product of multiplication , denominator ．

Fraction times fraction, using The product of multiplication is used as a molecule The product of multiplication is the denominator

When a fraction is multiplied by a fraction, the product of multiplication of molecules is used as the molecule and the product of multiplication of denominators as the denominator

How to calculate the integral number of fractions? When calculating, how to calculate more easily?

If you divide the denominator by an integer, you will get an integer and become a numerator; if you get a fraction, you will get an integer and become a numerator directly

The meaning of multiplying a fraction by an integer is the same as that of an integer, which is a simple operation for finding [?

6*3/5

How can we see how many electrons are transferred in the chemical reaction equation?