Why is there a part of metathesis reactions that are not non redox reactions, high school chemistry

Because redox reaction refers to a reaction with electron gain and loss (or electron transfer). That is, a reaction in which the valence of an element changes before and after the reaction of a substance participating in a chemical reaction).

The metathesis reaction is carried out in solution, the ions exchange components with each other, and there is no change in the valency of the elements in the substance before and after the reaction, or there is no electron gain or loss or transfer. So the metathesis reaction is not a redox reaction.

The metathesis reaction will not be accompanied by the rise and fall of the valency of the element, and the necessary conditions for its occurrence are: 1There is weak electrolyte production.

2.There is gas generation. 3.

There is precipitation generation. The essential reason for this is to reduce the total energy of the system and bring it closer to a steady state.

The judgment method is for the formation of water (the most common), the formation of weak acid (like H2SO3, but in general, it is directly decomposed into SO2 and H2O), and so on.

The redox reaction must be accompanied by the rise and fall of valence, and its essential reason is the gain and loss of electrons. The macroscopic manifestation is that the electron valency decreases, and the electron loss valency (decreased) increases (oxidized). Moreover, an increase in the valency of an element in a redox reaction must lead to a decrease in the valency of another element, for example.

Zn+2HCl=ZnCl2+H2This is a very typical redox reaction, the valency of Zn increases (from 0 to +2) and the valency of H+ decreases (from +1 to 0), so as long as the valency of the main element changes, it can be distinguished whether it is a redox reaction or a metathesis reaction.

In the case of metathesis reaction, then there is gas or precipitate in the product or gas and precipitate at the same time.

The decomposition reaction is the exchange of atoms or clusters between reactants, and the gas or precipitate is produced in the product after the exchange, or the gas and the precipitate are produced at the same time, and the valency does not change. Therefore, the metathesis reaction must not be a redox reaction.

Did you make a mistake? It's not Gafei, that's not for sure! And it's a redox reaction! It is recommended that you take a good look at the definition of redox reaction, explain: 2NaHCO3==Na2CO3

H2OCo2, in this reaction, there is no change in the valence of the elements in the substance, so part of the metathesis reaction is not a redox reaction, the same way: there is a change in the valency of the elements in the reaction, that is, a redox reaction!

Metathesis reaction is not a redox reaction.

So all metathesis reactions are not redox reactions because the chemical equation of metathesis reactions. The valency of the same element of reactants and products remains unchanged, so the metathesis reaction is not a redox reaction, such as: 1. Na2CO3 2HCl=2NaCl CO2.

In this reaction in 1 above, the valencies of Na, C and O in Na2CO3 in the reactant are 1, 4 and 2 respectively, the valency of H and Cl in HCL is 1 and 1 respectively, and the valency of NaCl, CO2 in the product and Na, Cl, C, O and H in H2O are 1, 1, 4, 2 and 1 respectively.

The valency of the same element on the left and right of the equation does not change, which is a metathesis reaction, not a redox reaction. The valencies of Ca(HCO3)2 in 2 and Ca, H, C, O, and Cl in HCL are 2, 1, 4, 2, and 1, respectively.

The valencies of Ca, Cl, C, O, and H in CaCl2, Co2, and H2O in the products are 2, 1, 4, 2, and 1, respectively, and the valency of the same element does not change around the equation, which is a metathesis reaction, not a redox reaction.

Redox reaction: Step-by-step oxidation occurs when reacting with an oxidant, which is essentially the gain or loss of electrons or the shift of shared electron pairs. For example:

h2+cl2=2hcl。Hydrogen is oxidized from 0 valence to +1 valence, and chlorine is reduced from 0 valence to -1 valence. So this is a redox reaction.

False, the metathesis reaction must not be a redox reaction. There is no change in the valency of any element in the metathesis reaction, and there must be a change in the valency of one or more elements in the redox reaction.

No way. The essence of redox reaction is the gain, loss or shift of electrons, which is generally the change of the valency of an element.

The expression of the metathesis reaction AB+CD=AD+CB, for example, acid-base neutralization NaOH+HCl===NaCl+H2O, is only an ion exchange position, and does not change the valency, so it cannot be called a redox reaction.

Yes. Types of decomposition reaction products:

1 Broken down into two elemental elements.

Decomposition of gaseous hydrides, such as hydrogen iodide.

Silver chloride decomposes.

Electrolysis, such as electrolysis of water.

2 Breaks down into two compounds.

Decomposition of unstable salts, such as calcium carbonate pyrolysis.

Unstable decomposition of weak bases, such as aluminum hydroxide decomposition.

Unstable decomposition of weak acids. Such as carbonic acid decomposition.

Dehydration of salts containing crystalline water, such as weathering of sodium carbonate decahydrate.

First of all, it is important to understand that the metathesis reaction can be written in the following form:

ab+cd=ad+bc

It must be the ion exchange that occurs for the metathesis reaction.

Acidic oxide is a molecule, not an ion, and there is no way to exchange with the alkali flourishing ions, so it is not considered a metathesis reaction. In the same way, the reverse wheel side of acids and basic oxides is not a metathesis reaction.

So what type of reaction does this type of reaction belong to? Strictly speaking, it should be the sum of the chemical reaction and the metathesis reaction. Here's an example:

co2+2naoh=na2co3+h2o

Actually, it is: CO2 + H2O = H2CO3

The sum of these two reactions, H2CO3 + 2NaOH = Na2CO3 + 2H2O, contains Tongtan.

The decomposition reaction may be redox, such as hydrogen peroxide decomposition, in this reaction the oxidant and the reducing agent are both hydrogen peroxide, hydrogen is obtained by decreasing the valency, which is the reduction product, and oxygen is obtained by increasing the valency, which is the oxidation product, this example tells us that the oxidant and the reducing agent may be the same substance, and in the same way, in the chemical reaction, the oxidation product and the reduction product can also be the same substance.

Decomposition reactions may also not be redox, such as the decomposition of calcium carbonate.

The key is to see whether the valency rises and falls, and whether the electrons have gains and losses and shifts.

Hope to be able to help you, thank you.

Both decomposition and synthesis can be redox reactions.

For example, 2kClO3=2kCl+3O2

It may be, but not necessarily, it becomes 0, and the increased chemical valence is oxidized and the lower is reduced.

Hydrogen peroxide splits into water and oxygen is.

Carbonic acid decomposes into carbon dioxide and water is not.

Possibly2H2O2=2H2O+O2 The oxygen in the water is reduced, and the oxygen in the oxygen is oxidized.

CaCO3 = high temperature = Cao + CO2 is not oxygen also reaction.

One becomes more decomposition; Changeable one is compounded; The reaction of two salts produces two new salts, but the exchange of anions and cations is called metathesis; There is a change in valency for redox; The acid-base reaction is called neutralization, and the generation of a new element and compound is called displacement.