The chemical reaction must have oxygen involved, so the chemical reaction is an oxidation reaction

Wrong! Many chemical reactions do not involve oxygen. For example:

Cu+Cl2==CuCl2 (Ignition is written above the equal sign) Cl2+PCL3==PCL5 As long as it is a reaction in which two or more substances produce another substance, it is called a chemical reaction. The chemical reaction is a redox reaction. I don't know if you are in the third year of junior high school or high school, have you ever learned this concept?

The redox reaction does not necessarily involve oxygen, as long as there is electron gain and loss, or valency change, it belongs to the redox reaction. Also, I see you in another question, "Why do you say that water contains hydrogen molecules and oxygen molecules, but not hydrogen atoms and oxygen atoms?" This statement is not true.

For the correct expression of water, there can be the following two statements: 1. Water is composed of hydrogen and oxygen; 2. A water molecule is composed of two hydrogen atoms and one oxygen atom. Is my group helpful to you?

If satisfied, oh.

Both phrases are problematic. First, there is the question of concept: a chemical reaction is the chemical reaction of two or more substances to produce a substance.

The basic expression is A+B = C The next is the deviation of understanding, the chemical reaction does not have to have oxygen to participate, for example, the reaction to generate NaCl: 2Na + Cl2 = 2NaCl to generate HCl (H2, Cl2) and so on It is not necessary to have oxygen, so the statement in the first half of the sentence is wrong, and the conclusion of the second half of the sentence is also wrong.

The participation of oxygen is not necessarily an oxidation reaction: for example, the conversion between oxygen and ozone is a reaction with the participation of oxygen, but the valency of oxygen in this reaction does not change, so it is not a redox reaction.

Why is it said that oxidation reaction does not necessarily involve oxygen: the scope of redox reaction is very broad, and it is not necessary to participate in oxygen, such as: the reaction of metal elements and acids, the catalytic oxidation of alcohols and aldehydes, etc., are all redox reactions that can be participated without oxygen.

Oxidation reaction in the narrow sense refers to the combination of substances and oxidation; A reduction reaction is the action by which a substance loses oxygen. The oxidation value increases during oxidation; The oxidation value decreases when reduced. Oxidation, reduction both refer to reactants (molecules, ions, or atoms).

Oxidation is also known as oxidation reaction. When organic matter reacts, the effect of introducing organic matter into oxygen or removing hydrogen is called oxidation; The action of introducing hydrogen or losing oxygen is called reduction. The oxidation of a substance that reacts slowly with oxygen and slowly heats up without emitting light is called slow oxidation, such as metal rust, biological respiration, etc.

Intense luminous oxidation is called combustion.

1. Potassium permanganate (KMNO4).

Potassium permanganate has strong oxidation, and can oxidize alkyls, aldecordehydes, and aryl groups of primary alcohols, aldehydes, and aromatic ring side chains into acids.

2. Manganese dioxide (mnO2).

Manganese dioxide is a milder oxidizing agent that oxidizes methyl groups in the side chains of aromatic rings to aldehydes.

3. Chromium trioxide (CRO3).

The pyridine complex of chromium trioxide is a relatively mild oxidizing agent that can oxidize primary alcohols to aldehydes without breaking carbon-carbon double bonds and other groups.

The reactions between substances and oxygen are all oxidation reactions, but oxidation reactions are not always with oxygen.

The oxidation reaction is the reaction between the substance and the oxygen, and the oxygen here refers to the oxygen element and does not refer to the elemental element of oxygen, so the reaction between the substance and the oxygen must be an oxidation reaction, but the oxidation reaction does not necessarily involve oxygen.

The reaction in which a substance loses electrons when it undergoes a chemical reaction is an oxidation reaction; The function of gaining electrons is called reduction.

Oxidation in the narrow sense refers to the combination of substances and oxidation; Reduction refers to the action of a substance losing oxygen. The oxidation value increases during oxidation; The oxidation value decreases when reduced. Oxidation, reduction both refer to reactants (molecules, ions, or atoms).

Oxidation is also called oxidation or oxidation reaction, and the action of introducing organic matter into oxygen or removing hydrogen during the reaction of organic matter is called oxidation; The effect of introducing hydrogen or losing oxygen is called reduction, and the oxidation of substances that reacts slowly with oxygen and slowly heats up without emitting light is called slow oxidation, such as metal rust, biological respiration, etc. In the redox reaction, the reaction in which the valency of one or some elements contained in the reactant increases is called oxidation reaction.

The definition of chemical reaction is:

A reaction in which two or more substances produce one substance. If oxygen reacts with another substance, and there is more than one product, then it is not called a chemical reaction.

Oxygen is a kind of element, and the valence of reaction with other substances will inevitably change, so it is a redox reaction.

As long as the reaction with oxygen is an oxidation reaction.

But it cannot be said the other way around, the oxidation reaction is not necessarily a reaction with oxygen.

Introduction: Oxidation reaction: The reaction in which a substance transfers electrons between another substance and another or more different substances and gains electrons by itself is called an oxidation reaction.

Characteristics of the oxidation reaction:

1.There is a chemical transformation of the substance, and the result of the reaction is a completely different substance;

2.It must have been the acquisition of electrons, which were negative in writing;

3.There must be one or more other different substances involved in the reaction.

The answer is: d.

A: It may be a decomposition reaction, such as hydrogen peroxide decomposition.

B: The combustion of hydrogen in chlorine is also a chemical reaction.

C: The same reason for stupidity with B.

The following discussion of the concept of chemical reaction is correct.

da.Reactions with the participation of oxygen are chemical reactions.

True: The reaction of oxygen with methane to produce water and carbon dioxide is not a combination.

b.The chemical reaction must be an oxidation reaction.

No, CO2 + H2O = H2CO3 is not oxidation.

c.A chemical reaction is a chemical reaction in which oxygen must be present and the reaction of two buried materials to produce another material.

Wrong! CO2 + H2O = H2CO3 is.

Compounded, but without oxygen.

d.The reaction of two or more substances to produce another substance. That's right.

It is only required that there is more than one reaction product, and as long as the oxidized is not elemental, most of them meet the requirements.

Combustion of organic substances such as methane, ethane, ethanol, etc., to produce carbon dioxide and water as well, for example.

Hydrogen sulfide is generated by combustion.

so2+h2o

O2 is the oxidizing agent.

H2O is neither an oxidizing agent nor a reducing agent.

High temperature = cao + CO2 does not need to heat the substance energized = 4Al+3O2 does not need to heat the substance.

d Heating b. It can be reacted with normal temperature and water.

Answer A analysis: The reaction between the substance and oxygen belongs to the oxidation reaction;

Chemical reaction refers to the reaction of two or more kinds of substances to form another substance Answer: a. The reaction between charcoal and oxygen belongs to the oxidation reaction, and the generation of carbon dioxide, a substance, belongs to the chemical reaction A is in line with the topic

b. The reaction of carbon dioxide and water to form carbonic acid is a chemical reaction, but it is not an oxidation reaction c. The decomposition of carbonic acid to form carbon dioxide and water belongs to the decomposition reaction D. The vaporization of dry ice to produce carbon dioxide is a physical change

Therefore, choose a to sell seepage.

Comments: This question mainly examines the concept of chemical reaction and oxidation reaction, the chemical reaction with aerobic participation must be an oxidation reaction, and the oxidation reaction with only one kind of product is a chemical reaction

In general, the reaction of oxides with oxides is mainly between acidic oxides and basic oxides. Due to the different chemical activities of each, the reaction conditions are also different.

Below I will give a few typical examples for reference:

1) Cao H2O Ca(OH)2, Na2O H2O NaOH, these two reactions can react violently at room temperature, from these two reactions, it can be seen that the alkaline oxides corresponding to strong alkalis can generally be violently combined with water at room temperature, and the acidic oxides corresponding to strong acids can also react at room temperature, but because water is liquid, the relative surface area in contact with solids is large, so the reaction is faster than that of solid oxides and gas oxides.

2) Na2O+SiO2=Na2SiO3, the reaction between such solids and solids requires high temperature conditions, generally above 800 degrees Celsius before the reaction can obviously occur;

3) Na2O SO3 Na2SO4, Na2O SO2 Na2SO3, the reaction between this kind of solid and gas can generally occur under heating conditions, and in the acidic oxide that reacts with the same alkaline oxide, if the acid corresponding to the acidic oxide is weaker, the reaction condition is higher, that is, it is heated to a higher temperature before the obvious reaction can occur, but it is lower than the reaction temperature requirements between the solid and the solid, generally about 400 to 600 degrees Celsius.

4) The redox reactions between oxides and oxides are not included in this scope and should be discussed separately.