Middle School Chemistry Questions about stability

The more active the metal, the stronger the reducibility, the easier it is to be oxidized, so the more unstable it is.

Corrosion resistance has a certain relationship with stability, but not all, the better the stability, the less it will be oxidized, and the natural corrosion resistance is strong, but some metals have some special properties, such as the stability of aluminum is worse than iron, but aluminum can form a dense alumina film on the surface after reacting with oxygen at room temperature, preventing the internal from continuing to be oxidized, and iron cannot, so the corrosion resistance of aluminum is better than iron.

Sodium. Potassium. Minerals from metals such as magnesium are stable. Silver. The compounds of mercury are unstable", minerals and compounds are the chemical states of metals, not metal elements.

The more active the metal, the easier it is to be oxidized, and after being oxidized, it is in a stable state, and it is difficult to reduce it, so it is stable.

The metal with weak metal activity is not easy to be oxidized, and it is easy to be reduced to metal elements after oxidation, so it is unstable.

The more active it is, the more unstable it is.

The less stable it is, the easier it is to react with the outside world and the easier it is to be corroded.

The stronger it is, the more unstable it is, because it's not honest.

Stability has nothing to do with corrosion.

What is the activity of the metal, to put it bluntly, is the degree of activity, so the stronger the more unstable, as for the corrosion resistance is not necessarily, generally speaking, but the active metal like a donkey will form a dense oxide film, very corrosion-resistant, and passivation. Therefore, corrosion resistance is not so simple, it depends on the situation.

The more active you are, the more likely you are to react. There are many kinds of corrosion, and if only acid corrosion is considered, the greater the stability, the less likely it is to react, and the greater the corrosion resistance.

The stability of chemical substances generally refers to the degree of difficulty, stability, and ease of change of chemical substances in real conditions.

Most of these changes are chemical changes, such as: reaction with oxygen stove to call gas, natural decomposition, reaction with moisture in the air, etc.; There are also physical changes, such as: volatilization, precipitation, concentration, etc.; There are also biological changes, such as mold, etc.

In general, stability in what environment is indicated. For example, the stability of high temperature indicates that it is difficult to change at high temperatures.

Such as: no decomposition, combustion, explosion and no explosion. There is also an indication of chemical stability, which generally means that it does not change in the presence of acid, alkali, oxidant, etc.

The stability of a chemical substance generally refers to the ease with which a chemical substance changes in a real state, its stability, and whether it is easy to change.

Most of these changes are chemical changes, such as: reaction with oxygen, natural decomposition, reaction with moisture in the air, etc.; There are also physical changes, such as: volatilization, precipitation, concentration, etc.; There are also biological changes, such as mold, etc. Rent.

In general, it is necessary to indicate the stability in which ring macros are indicated. For example, the stability of high temperature indicates that it is difficult to change at high temperatures.

Such as: no decomposition, combustion, **, etc. There is also an indication of chemical stability, which generally means that it does not change in the presence of acid, alkali, oxidant, etc.

The stability reaction is the degree of ease with which a substance undergoes a chemical reaction under certain conditions. Chemical Properties: The properties of a substance that exhibit in a chemical change are called chemical properties.

Chemical change: When a substance changes, a new substance is formed, and this change is called a chemical change, also known as a chemical reaction.

It is the property of a substance that manifests itself in a chemical change. For example, the chemical properties of the substance category: acidic, alkaline, oxidizing, reducible, thermal stability and some other properties. Chemical properties and chemical changes are inherent properties of any substance.

Such as flammability, stability, macro qualitative, instability, thermal stability, acidity, alkaline, oxidation, flammability, reduction, complexity, toxicity, corrosiveness, gold search properties, non-metallic properties and the phenomenon of reaction with certain substances. The chemical properties of a substance can be known by the method of causing a chemical reaction of a substance.

The stability of a chemical substance generally refers to the degree of difficulty with which a chemical substance changes in a realistic state, with good stability and not easy to change. The so-called state of reality is also the environment in which we live. Most of these changes are chemical changes, such as:

reacts with oxygen, decomposes naturally, reacts with moisture in the air, etc.; There are also physical changes, such as: volatilization, precipitation, concentration, etc.; There are also biological changes, such as mold, etc.

In general, it is necessary to indicate the stability in which the environment is absolutely unstable. For example, high temperature stability, indicating that it is difficult to change at high temperatures, such as:

No decomposition, combustion, etc. There is also an indication of chemical stability, which generally means that it does not change in the presence of acid and alkali, Yin Hongkai oxidant, etc.

The water flows to the low place, and the low is the lack of wear stability of the water at the high place.

Combustion C usually produces CO2, so CO2 is stable, otherwise why not generate C2O2, C3O7?

Stability is a trend, it is in line with the laws of nature, there are N2 and O2 in the air, why is there no generation of NO, and the scum is NO2? Because N2, O2 is more stable in the air than them...

The ability of a substance to maintain its original physicochemical properties under the action of chemical factors.

For example: key guess the sedan car.

The chemical stability of a drug refers to the change in the content (or potency) and color of the drug due to chemical degradation reactions such as hydrolysis and oxidation. Including between drugs and drugs, between drugs and solvents, additives, impurities, containers, external substances (air, light, moisture, etc.), resulting in the decomposition and deterioration of the preparation of traditional Chinese medicine.

The chemical stability of an emulsion refers to the stability of an emulsion to the chemicals added. Most of the chemicals that have great destructive power to dispersions are water-soluble and can be divided into two categories: electrolytes and non-electrolytes, the former is generally inorganic salts, and the latter is generally polar organic compounds. In practical terms, it mostly refers to the stability of the added electrolyte, so in a narrow sense, it refers to the stability of the electrolyte.

Magnetochemical stability refers to the degree of oxidation and corrosion resistance of permanent magnet materials.

Carbon and carbon monoxide are relatively stable at room temperature, so they are correctly slippery;

Both carbon and carbon monoxide can be burned in the air, so it is correct;

Both carbon and carbon monoxide need to react with copper oxide under heated conditions; Therefore it is wrong;

Carbon transport wax resistance transport and carbon monoxide react with metal oxides to obtain oxygen, which is a reducing agent, with reducing properties, so it is correct;

Carbon and carbon monoxide are reducible in the reaction, so they are wrong;

Therefore, C

a. Oxygen can support combustion, but it cannot be burned; therefore a error;

b. Due to the inactive chemical properties of nitrogen, it generally does not react with other substances, so it is often used as a protective gas; Therefore b is correct;

c. Helium is a rare gas, the chemical properties are not active, and the density of the air in the small density can be used to fill the balloon, so C is correct;

d. Oxygen has the property of supporting combustion and can be used for oxygen-rich steelmaking; Therefore d is correct Therefore, it is selected: a