Redox reaction electron transfer, representation of electron transfer in redox reactions

In redox reactions, considering the conservation of electron numbers, the total valence state of the increase in the reaction should be equal to the total valence state of the decrease. In the beginner stage, you are relatively safe and less prone to mistakes after you have leveled. After the balancing, the amount of the substance transferred by electrons is calculated as long as the total number of valency increases or decreases is fully fixed, which is the amount of substances transferred by electrons.

The amount of the substance to be reduced is how many moles of the compound or element in which you see the valence of the element being reduced is reduced.

For 3Fe + Hno3 = 3Fe(NO3)2 + 2No + 4H2O, you first have no trim in the equation. It should be.

3fe+8hno3=3fe(no3)2+2no+4h2o.Then let's look at nitric acid is a total of 8 moles, of which n element is a total of 8 moles. After the reaction, the valency of the n element does not change at 6 moles, and the valency of the n element at 2 moles changes, so the nitric acid participating in the reaction is 2 moles.

Hope it helps. :>

The transferred electrons have nothing to do with the lower corner mark of the product, but only the number and proportion of atoms.

In fact, it is necessary to balance, and the amount of the reduced substance depends on the change of its outer electrons to determine that it is the reduced substance, and then the relative atomic mass is OK.

The number of electrons gained and lost should be equal.

But you don't think it's a metathesis reaction,,, not a redox reaction.

The representation of electron transfer in redox reactions refers to the single-wire bridging method.

In the redox reaction, there is a transfer of electrons (gain or loss or offset), that is, there are element electrons in the reactant to gain or lose or shift, then use a broken line with an arrow to point to the element that has lost electrons from the element that has lost electrons, and mark the number of electrons transferred on the "bridge", this representation method is called single-line bridge method. (The single-line bridge method represents the transfer of electrons between the same or different elements in the reactant, i.e., the direction and number of electron transfers.) ）

Redox reactions.

Step: Tag status.

1. Correctly mark the valency of each element before and after the reaction.

2. Clarify the valence rise and fall relationship of valence elements.

Connecting a single line: A line starts from the element in the reducing agent with an increased valency and ends with the element with a reduced valency in the oxidant.

Labeling gains and losses: Marking the total number of transferred electrons, here there is no need to directly mark the total number of electrons like a two-line bridge.

Single-line bridge method. Notes:

1) Must not be indicated"Yes"or"lost", otherwise it is wrong.

2) The arrow indicates the direction of electron transfer, pointing to the oxidant.

Note: For the sake of specification, it is best not to use the single-line bridging method for autoredox reactions, because that labeling will make the fate of electrons in the reaction unclear, so it is best to use the two-line bridging method to represent electron transfer in the autoredox reaction equation.

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.

Single-line bridge method. The arrow points from the oxidized element in the reducing agent to the reduced element in the oxidant, and the direction of the arrow is the direction of electron transfer. The total number of transferred electrons is indicated on the bridge.

Two-line bridge method.

The arrows point to the reduction product by the oxidant, and the reducing agent points to the oxidation product, respectively. The arrows refer to the same element at both ends; The arrows do not indicate the direction of electron transfer, only the change before and after electron transfer. Indicate the number of electrons gained and lost on the bridge; The total number of electrons gained and lost is equal.

Example: Copper and oxygen reflect to form copper oxide, copper is bivalent, the number of the previous is 2, and the number of electrons transferred is 2*2e=4e.

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.

Electron pair shift is the phenomenon of electron pair shift due to the different ability of the two elements to attract electrons when two different elements form a covalent bond.

For example, in the redox reaction H2+Cl2= =2HClIn HCl, the electron pair is biased towards chlorine, which has a stronger ability to attract electrons.

The change in the valency of each element before and after the reaction has been calculated by stoichiometric numbers using the principle of conservation of electrons gained and lost.

The number of atoms that react with an element The number of atoms that react with the element Coefficient = The number of atoms that react with an element The number of atoms that react with the element Coefficient.

The above two coefficients are the numbers that make the two sides of the equation equal, that is, the least common multiple.

1molCl2 becomes Cl ion, which is 2mol. Electron transfer is calculated as how many electrons are transferred by each atom, and the multiplication coefficient is for the conservation of atoms.

I don't know if that's what it means, why don't you send the title?

The redox reaction is a reaction in which the valency of an element changes before and after the reaction, and the change in the valency of the element is closely related to the transfer of electrons. Electrons are obtained, and the valency of the element decreases; With the loss of electrons, the valency of the element increases. The number of electrons transferred is equal to the total number of electrons gained, and it is also equal to the total number of electrons lost.

When calculating the number of transferred electrons, first calculate the number of electrons gained or lost by an atom, the number of electrons gained and lost by an atom is equal to the difference between the valency of the element before and after the reaction, and then observe the change of the valency of several atoms before and after the reaction, and the total number of transferred electrons is obtained by multiplying the two.

For example, the reaction of iron smelting in industry is Fe2O3+3CO=2Fe+3CO2, and the iron changes from +3 valence to 0 valence, and the difference in valency is 3, that is, one iron atom gets 3 electrons, and the valency of 2 iron atoms changes, so the total number of electrons obtained is 3 2 = 6. In the same way, carbon changes from +2 valence to +4 valence, one carbon atom loses 2 electrons, and 3 carbon atoms change in valence, and the total number of electrons lost is 2 3 = 6. So the reaction transfers 6 electrons, 1 mole of iron oxide participates in the reaction, and 6 moles of electrons are transferred.

The number of valence atoms * the change valence state.

The valency of each element changes by x, we say that each atom of that element has transferred x electrons, and there are n atoms of electrons that have transferred nx electrons.

The 2 in the lower right corner of H2 means that there are 2 hydrogen atoms in 1 hydrogen molecule, for example, Zn + 2HCl = ZnCl2 + H2 The valency of the hydrogen element changes from +1 to 0, and the valency changes by 1, which means that each hydrogen atom has transferred 1 electron.

And there are 2 hydrogen atoms with a change in valency, so the total transfer of 2 electrons is made.

The following corner mark refers to the number of atoms contained in each molecule, and when looking at how many atoms there are, of course, you have to look at the corner mark.

For example, H2 + Cl2 = 2HCl

The elements with valency change in it are hydrogen and chlorine, and the 2 in the lower right corner of hydrogen h2 means that there are 2 hydrogen atoms in 1 hydrogen molecule, so we say that each hydrogen atom loses 1 electron, but there are 2 hydrogen atoms, so a total of 2 electrons are lost.

The redox reaction, as opposed to the displacement reaction, is the sum of the whole.

Relationships between individuals.

All chemical reactions with electron gain and loss, or valency changes, are redox reactions.

The displacement reaction is a reaction in which an element reacts with a compound to generate another element and another compound, which must have a change in the gain and loss of electrons, so the displacement reaction must be a redox reaction.

But not all redox reactions are displacement reactions. For example, the chemical reaction and the decomposition reaction of the silver will also have a grinding redox reaction.

Reducer. Oxidant.

Oxidation products. Reduction products.

Generally speaking, the reducing product in the same reaction is weaker than the reducing agent, and the oxidation of the oxidation product is weaker than the oxidant, which is the so-called "strong reducing agent to weak reducing agent, strong oxidant to weak oxidant".

Summary: The oxidant undergoes a reduction reaction, electrons are obtained, the valency is reduced, it is oxidized, it is reduced, and the reduction product is generated.

The reducing agent undergoes an oxidation reaction, loses electrons, increases the valency, has reducibility, is oxidized, and generates oxidation products.

Explanation:1The valency increases, electrons are lost, and the oxidation reaction occurs in Yanqing, which acts as a reducing agent, and the product has a weaker oxidation than the oxidant in the reactant.

2.The valency is reduced, electrons are obtained, a reduction reaction occurs, and the product is weaker than the reducing agent in the reactant before filling the ridge.

Redox reactions.

embodied in: Reactant.

Valency. but its essence is the gain or loss of electrons.

Shared electronic debate cars.

offset. Electron transfer means that the outermost electrons of reactants may be transferred from one atom (element) to atoms (elements) in another reaction component during the reaction, or the shared electron pairs are shifted, which changes the valency of the reactants from the sail and the appearance.

All redox reactions are accompanied by the migration of Songxiang electron field stoves, and there are amol substances involved in the reaction, and the valence of ABol increases (decreases) B, and there is ABMOL of electric banquet eggplant transfer. If there is 1molCu involved in the reaction.

Cu+Cl2===CuCl2, then the electron transfer is 2mol.