Is it necessary to have strong metallicity in a highly active metal? Or is it true that the other wa

The atoms of metallic elements usually show a tendency to lose electrons and become cations in chemical reactions. The strength of metallicity is usually measured by the ionization energy of the outermost electron of a metallic element atom (the energy required for a gaseous atom to lose electrons to become a gaseous cation).

The activity of the metal is to reflect the size of the tendency of the metal to form hydrated ions in the aqueous solution, that is, to reflect the difficulty of the oxidation reaction of the metal in the aqueous solution, it is based on the standard electrode potential of the metal, from the energy point of view, the standard electrode potential of the metal is not only related to the ionization energy of the metal element atoms, but also related to the sublimation energy of the metal (the energy required when the solid element becomes a gaseous atom), the hydration energy (the energy released when the metal cation is combined with hydration) and other factors.

Metallic elements are generally more active, but there are also inconsistencies. For example, the first ionization energy of sodium is smaller than that of calcium, so sodium is more metallic than calcium. However, calcium has a greater tendency to form hydrated ions in aqueous solution than sodium, that is, the standard electrode potential of calcium is more negative than sodium, so the metal activity of calcium is greater than that of sodium.

Copper and silver are in a similar vein. It can be seen that there is a difference between the concepts of metallicity and metal activity.

Certainly, established, is metallic liveliness, equivalent.

Potassium barium calcium sodium magnesium aluminum is followed by manganese, zinc, chromium, iron, nickel, tin, lead (hydrogen), copper, mercury, silver, platinum, gold. (K, BA, CA, NA, sensitive hands and mg, al, mn, zn, cr, fe, ni, sn, pb(h), cu, hg, ag, pt, au.) ）

The most active metal is lithium, and the strongest attribute of golden potato is cesium. Metal activity is a thermodynamic criterion that is determined by the electrode potential in the standard state.

Activity from high to low: potassium, calcium, sodium, magnesium, aluminum, zinc, iron, tin, lead (hydrogen), copper, mercury, silver, platinum, gold.

Homophonic notation: Marry that beauty, zinc and iron cherish a thousand catties, and child labor wins platinum.

The most metallic activity is potassium.

The common metal activity order is k, ca, na, mg, al, zn, fe, sn, pb, h, cu, hg, ag, pt, au; In the order of metal activity, the higher the position of the metal, the stronger the activity of the metal, and among the four metals of zinc, iron, copper and silver, zinc is the highest and has the strongest metal activity.

The activity of the metal reflects the tendency of the metal to form hydrated ions in the aqueous solution, that is, it reflects the difficulty of the oxidation reaction of the metal in the aqueous solution, which is based on the standard electrode potential of the metal. The metal activity sequence table is made of metals according to the strength of metal activity.

Metal:

Metals generally refer to substances that have a characteristic luster (i.e., a strong reflection of visible light), opacity, malleability, and thermal conductivity. The narrow concept of metal is the elemental substance composed of metallic elements. Pure metals are generally solid (except for mercury) at room temperature, and most of them are excellent conductors of electricity and heat, with higher density and higher melting points.

The earth's metal resources are widely found in the earth's crust and oceans, except for a few very inactive metals such as gold and silver, which exist in elemental forms, the rest exist in the form of chemical compounds.

Metals are widely present in nature, and are widely used in life, and are a very important and most widely used substance in modern industry.

Metallicity refers to the metallicity of an element refers to the ability of the atoms of an element to lose electrons. (Emphasis is placed on the oxidation and reduction of metal elements).

Metal activity refers to the activity of metals, and the strong activity of metals can be replaced from their salt solution. It reflects the tendency of the metal to form hydrated ions in the aqueous solution, that is, it reflects the difficulty of the oxidation reaction of the metal in the aqueous solution (emphasizing the stability and activity of the metal).

For example: 1) 2Na+2H2O==2NaOH+H2

Mg + 2H2O = Heat = Mg (OH) 2 + H2

It shows that the metal activity of Na is stronger than that of MG, because the reaction of Na in water is more violent than that of MG (the stability of Na is not as good as that of MG), and for example: Cu does not react with hydrochloric acid, but iron is easy to react with hydrochloric acid.

2) 4na+o2==2na2o

2k+o2=k2o2

Because K is more volatile than Na, K is more metallic than Na, and for example, Fe2+ is more oxidized than Na+, so Na is more metallic than Fe.

One more point: metal activity is derived from metallicity.

If you have a question, ask .........

Metallicity refers to the ability of the element to lose electrons, that is, the loss of electrons reflects the metallicity, and the metal activity reflects the ability of the metal to form hydrated ions in the aqueous solution, and the difficulty of the oxidation reaction to lose electrons in the aqueous solution, and the redox reaction in the aqueous solution shows the activity of the metal.

Metallicity does not necessarily refer to the metal (it is the size of the loss of electron ability of the substance, such as the periodic table, the first main group, from top to bottom, the metallicity is enhanced in turn,), the metal activity must refer to the metal, refers to the degree of metal activity, such as Na and water reaction is much more intense than Fe, here it is said that Na is more active than Fe, that is, the metal is more active.

Metallicity indicates the tendency of the atoms of the element to lose electrons, the stronger the metallicity of the element, the stronger its elemental reducibility, the stronger the non-metallic nature of the element, the stronger the oxidation of its element.

The activity of the genus is a reflection of the tendency of the metal to form hydrated ions in the aqueous solution, that is, it reflects the difficulty of the oxidation reaction of the metal in the aqueous solution, which is based on the standard electrode potential of the metal.

Details:

First of all, according to the metal activity table: potassium, calcium, sodium, magnesium, aluminum, zinc, iron, tin, lead, hydrogen, copper, mercury, silver, platinum. It can then also be analyzed by displacement reactions:

Method 1: Compare the activity of iron and zinc.

For example, if there are two metals, Fe, Copper and ZN, put the same mass of Fe, Copper and Zn into a sufficient amount of hydrochloric acid of the same concentration to compare the rate of hydrogen production. If Zn produces hydrogen faster than Fe, the activity of Zn is greater than that of iron, and copper does not react with acid, indicating that the activity of copper is less than that of iron and zinc.

Metal activity from strong to weak: Zn Fe Cu

Method 2: Compare the activity of iron and copper.

Put the iron nail into the salt solution of Cuso4, attach a layer of red metallic copper to the iron nail, and then put the copper into the solution of Feso4, there is no change, indicating that the activity of iron is greater than that of copper. fe＞cu

Magnesium is more likely to ignite in the air than aluminum, indicating that magnesium is more active than aluminum. (Aluminum is more corrosion-resistant than zinc, indicating that zinc is more active than aluminum; (The surface of the metal aluminum will oxidize in the air to form a dense oxide film, preventing the internal metal from continuing to be oxidized).

Copper sulfate and lime water are used to prepare pesticide Bordeaux liquid, and iron containers should not be used; (Yes, iron is more active than copper and displaces copper in solution).

The reaction rate of metal zinc and dilute sulfuric acid is moderate, which is more suitable for laboratory hydrogen production. (Yes, with too much activity such as magnesium, the rate of hydrogen production is too fast to be collected, and the rate of iron is too slow.)

Select C for this question

Analysis] Although magnesium is indeed more active than aluminum, it should not be concluded by the degree of flammability. Because there is an oxide film on the surface of AL, it has a flame retardant effect to a certain extent.

The first conclusion is wrong, obviously aluminum is more active than zinc, and aluminum is more resistant to corrosion because of the existence of an oxide film on the surface.

c This is the positive solution, Fe + CuSO4 ==== FeSO4 + Cu, the iron container is filled with Bordeaux liquid, and the displacement reaction will occur

At the same time, it also proves that the order of activity of iron is stronger than that of cu.

D is fine, but it only shows that zn is located in front of the hydrogen level, and its reaction rate is not clearly related to the order of activity.

Good luck with your studies

Magnesium metal is more easily ignited in the air than aluminum, indicating that magnesium is more active than aluminum, copper sulfate, lime water to prepare pesticide Bordeaux liquid, should not use iron containers These two are right, we have tested it monthly, 100%.

Your satisfactory adoption is the best encouragement to the respondents.

Copper sulfate and lime water are used to prepare pesticide Bordeaux liquid, and iron containers should not be used;

This is a displacement reaction, which leads to the conclusion that iron is more active than copper" The essence of this reaction is divided into four parts:

cuso4 + fe --feso4 + cucaco3 --cao + co2cao + h2o --ca(oh)2cuso4 + ca(oh)2 --cu(oh)2 + caso4

The function that determines the activity of a metal is the standard electrode potential of the metal and the standard Gibbs free energy that reacts with water, so the more negative the electrode potential, the greater the free energy and the stronger the activity;

One of the influencing factors of free energy is enthalpy change, when the metal monochrome socks form cations in water, it undergoes three steps of sublimation, ionization and hydration, and there are energy changes in these three steps, which determines the enthalpy of the total reaction, which has a great impact on the activity of the metal, so when analyzing the causes of metal activity, it is necessary to comprehensively consider the sublimation energy, ionization energy and hydration heat of the metal;

Generally speaking, the activity of the elements in the periodic table from top to bottom and from right to left has an increasing trend, and the essential reason is that with the increase of the metal radius, the number of excited electrons in the outermost trouser posture decreases, and its ionization energy and sublimation energy both decrease, although the hydration heat.

There are several ways to compare the activity of metals.

First, first of all, according to the metal activity table, potassium, calcium, sodium, magnesium, zinc, iron, tin, lead, hydrogen, copper, mercury, silver, platinum, you can judge the strength of metal activity.

Second, the activity of different metals can be roughly judged by whether the metal can react with oxygen, the conditions under which the reaction occurs and the intensity of the reaction.

Thirdly, by using whether the metal can react with the acid and the intensity of the reaction, the strength of the metal's active attack can be judged. This method is suitable for two situations, namely: the stronger the activity of the metal, the more intense the reaction with the acid; Metals that can react with acids are more active than metals that do not.

Fourth, the ability of one metal to displace another metal from its soluble compound solution can be used to determine the strength of the activity between certain metals. For the comparison of the activity between two metals that do not react with acid, or can have a displacement reaction with acid, you can choose a soluble compound solution of one metal and another metal to see whether the two can have a displacement reaction, and then judge.

Fifth, the activity of the metal is to compare the reducibility of the metal, which can be compared according to the degree of reaction between the metal and water, and the activity of the metal with a relatively large degree of reaction is relatively strong.