The process of conduction of electrolyte solution, is the conduction of electrolyte solution a chemi

Conductivity of solutions in junior high chemistry.

First of allElectrolyte solutionConduction is a physical reaction because it is just the directional motion of ions.

Secondly, the electrolysis of any electrolyte such as NaCl, MgCl2 is a physical change because no new species are formed.

Because solid NaCl actually has sodium ions.

and chloride ion group segments, there is no such thing as a sodium chloride molecule. After electrolysis, sodium ions and chloride ions are still present in the solution.

And the total amount of ions does not change, which also implies that it is a physical reaction. Salt water is a mixture of table salt and water, and the mixture cannot be called an electrolyte. The main electrolyte is NACL in table salt.

If you want to add a small amount of AgNO3 to the salt water, then it is a chemical change, because the Ag+ and Cl- ions form a precipitate.

Moreover, the amount of Cl- ions in the original solution is reduced, because the precipitated AGCL will not be ionized into AG and Cl ions, which is more certain that the formation of the precipitate is a chemical change.

In the process of conducting electricity, it is accompanied by chemical reactions.

A redox reaction occurs on the cathode and anode.

For example, a sodium chloride solution.

Energized, under the action of the electric field, chloride ions move towards the anode, sodium ions move towards the cathode, and chloride ions lose electrons on the anode.

The reaction produces chlorine gas.

Although sodium ions accumulate at the cathode, it is not it that gets electrons, but H+, and the reaction becomes hydrogen. Finally, there will be a large number of large hydroxide excitons near the cathode.

The electrolyte solution conducts electricity, which is a physical change, not a chemical change. Chemical change, from the point of view of junior high school, is whether or not a new substance is produced. When I entered a new layer of high school, the criterion for judging was whether there was a break of the old bond and the formation of a new one.

Therefore, from the perspective of this filial piety standard, it is obvious that it is not a change in the study of empty space.

The electrolyte solution conducts electricity because it can ionize anions and cations in an aqueous solution, so it is a chemical change.

The electrolyte solution conducts electricity and is a physical change. Acting like a conductor conducts electricity, there are freely moving electrons. The electrolyte solution conducts electricity because there are freely moving ions in the solution when it is not rented. There is no new substance in this process, so it is a physical change.

No, the conduction of an electrolyte solution is a physical change. It is only a directional movement of the ions of the electrolyte, but there is no material change of the excitation on the essence of the Ming Dynasty. But the dust removal electrolysis reaction itself is a chemical change. Conductive electricity is not.

Conduction is a physical change, and the essence of a chemical change is the creation of new substances.

The conductivity of an electrolyte solution is a chemical change!! And it involves redox reactions. How to explain the physical change of copper sulfate solution electrode with copper elemental element?

1. Anode: 2Cl--2E-=Cl2 (up arrow) Cathode: Cu2+ +2E— =Cu

CuCl2 == Electrolysis ==Cu + Cl2 (up arrow).

2. Anode: 2Cl - 2e - Cl2 (up arrow) Cathode: 2Na+ +2E- = 2Na

2NaCl (melted) == Electrolysis ==2Na + Cl2 (up arrow).

3. Anode: 2Cl— —2E— =Cl2 (up arrow) Cathode: 2H+ +2E— =H2 (up arrow).

2 kCl + 2H2O) = Electrolysis = = 2koH + Cl2 (up arrow) + H2 (up arrow).

4. Anode: 4oh--4e— =2ho2 + o2 (up arrow).

Cathode: Cu2+ +2E— =Cu

2CuSO4 + 2H2O == Electrolysis == 2H2SO4 + 2Cu + O2 (up arrow).

5. Anode: 4oh--4e— =2ho2 + o2 (up arrow).

Cathode: 2h+ +2e— =h2 (up arrow).

2H2O == Electrolysis == 2H2 (up arrow) + O2 (up arrow).

Electrolytes are compounds that are capable of conducting electricity in an aqueous solution or in a molten state, such as acids, bases, and salts. Compounds that cannot conduct electricity under the above circumstances are called non-electrolytes, such as sucrose, alcohol, etc.

To determine whether a compound is an electrolyte, it is not only based on whether it conducts electricity in aqueous solution, but also needs to further investigate its crystal structure and the properties of chemical bonds. For example, to determine whether barium sulfate, calcium carbonate, and iron hydroxide are electrolytes. Barium sulfate is poorly soluble in water (20

The solubility in water is.

g), the ion concentration in the solution is very small, and its aqueous solution is non-conductive and appears to be a non-electrolyte. However, the small fraction of barium sulfate dissolved in water is almost completely ionized (20

The degree of ionization of barium sulfate saturated solution is. Thus, barium sulfate is an electrolyte. Calcium carbonate and barium sulfate have a similar situation and are also electrolytes.

From a structural point of view, for other insoluble salts, as long as they are ionic compounds or strong polar covalent compounds, although they are insoluble, they are also electrolytes.

The case of iron hydroxide is more complicated, with the chemical bond between Fe3+ and OH- being covalent and less soluble than barium sulfate (20).

The solubility in water is.

g)；A small part of the part that falls on water may form colloids, and the rest can also be ionized into ions. But iron hydroxide is also an electrolyte.

Rainwater conducts electricity, so there are some electrolytes, but very little.

To determine whether the oxide is an electrolyte, a specific analysis should also be made. Non-metallic oxygen mergoteds, such as SO2, SO3, P2O5, CO2, etc., are covalent compounds that do not conduct electricity in liquid state, so they are not electrolytes. Some oxides are not electrolytes even if they conduct electricity in aqueous solutions.

Because these oxides react with water to form a new conductive substance, the conductive material in the solution is not the original oxide, such as SO2 itself cannot be ionized, but it reacts with water to form sulfurous acid, which is the electrolyte. Metal oxides such as Na2O, MGO, CaO, Al2O3, etc., are ionic compounds that are capable of conducting electricity in the molten state and are therefore electrolytes.

It can be seen that electrolytes include ionic or strongly polar covalent compounds; Non-electrolytes include weakly polar or non-polar covalent compounds. The aqueous solution of electrolytes conducts electricity because the electrolyte can be dissociated into ions. As for whether a substance can be ionized in water, it is determined by its structure.

Therefore, the identification of electrolytes from non-electrolytes by the structure of matter is the essence of the problem.

In addition, some substances that can conduct electricity, such as copper and aluminum, are not electrolytes. Because they are not electrically conductive compounds, they are elemental and do not meet the definition of electrolyte.

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Problem description: I hope to be able to answer how the positive and negative ions can continue to conduct electricity after moving to the poles to exchange charges.

Analysis: Na2SO4 conducts electricity in the solution, and sodium ions move, but instead of gaining an electron at the cathode to become sodium metal, a trace amount of hydrogen ions in the solution reaches the cathode, gaining an electron to become a hydrogen atom, and then combining in pairs to become hydrogen. The anode is hydroxide ion discharge, 4oh- -4e = 2h2o + o2, if there is a diaphragm in the electrolyzer, only sodium ions are allowed to pass through, then the reaction is final, the cathode region only has sodium hydroxide aqueous solution, and the anode region only has dilute sulfuric acid, and then the reaction stops.

However, when we do experiments, we generally do not add a diaphragm, and the sodium ions that reach the vicinity of the cathode often leave the cathode due to diffusion or convection, and the same is true for sulfate, and hydrogen ions and hydroxide ions will also be neutralized, so electrolysis can continue to know that the water is exhausted.

Summary. Dear, glad to answer for you! The conduction of electricity in the electrolyte solution is not a chemical change, but the movement of positive and negative ions.

However, the electrification process must lead to a chemical change in conducting electricity with NaCl. H2 and Cl2 are bound to be generated. But again, conduction itself is not due to chemical changes.

Dear, glad to answer for you! The conduction of electrolyte solution is not a chemical change, but the movement of positive and negative ions. However, the electrification process must lead to a chemical change in conducting electricity with NaCl.

H2 and Cl2 are bound to be generated. But again, the conduction itself is not due to chemical changes.

Dear, the expansion content is as follows<>

Influencing factors of electrolyte dissolution skin extraction conduction:1Degree of ionization, the ratio of the number of ionized electrolyte molecules to their total number of molecules when ionization equilibrium is reached, expressed as a percentage.

2.Conductance, the reciprocal of resistance, is consistent with the meaning of conductivity in electrical engineering. 3.

Ion mobility, the greater the ion mobility of the electrolyte, the greater its equivalent conductance. 4.Ion mobility number, the fraction of the amount of electricity transported by a certain ion migration, which accounts for the total amount of electricity through which liquid is dissolved, is also known as the fraction of ion transmission. Line nucleus.

The solution is just uncharged as a whole, but there are ions in the solution that move from the sun to the sun, and when an electric current passes, these ions can play the role of transferring electrons, so they can conduct electricity.

There are ions in the solution that can move freely, and when no voltage is added, that is, when no external electric field is added, the ions in it are evenly distributed, so the whole is not electrically visible; And once an external electric field is added, the ions will help carry the electrons, and they will conduct electricity at an early age.

The solution contains solutes, and solvents exist in a molecular or ionic state, and many solutes are dissolved and ionized into positively and negatively charged ions, and these free-moving ions can conduct electricity.