How to judge the metal activity of iron, magnesium, manganese 20

The metallicity of the element is often consistent with the order of metallic activity of the element

1. According to the metal activity sequence table (except for a very few). The higher the position, the more metallic it is.

2. The difficulty of reacting with water at room temperature. The easier it is to react with water, the stronger the metallicity.

3. The difficulty of reacting with acid at room temperature. The easier it is to react with acids, the stronger the metallicity.

4. Displacement reaction between metal and salt solution. Metals with strong metallicity can replace metals with weak metallic properties.

5. The oxidation of metal cations (except for a very few). The stronger the oxidation of the cation, the weaker the metallicity of the corresponding metal.

6. The alkalinity of the most ** oxide corresponds to the hydrate. The more alkaline it is, the stronger the metallicity of the corresponding element.

7. In the same period, from left to right, with the increase of the number of nuclear charges, the metallicity weakens. In the same main group, from top to bottom, with the increase of the number of nuclear charges, the metallicity increases.

In summary: Mg>Mn>Fe

1: Take manganese chloride in a test tube, put magnesium and iron respectively, and observe whether there is solid precipitation.

2: Brass is a copper-zinc alloy, indicating that zinc contains 3g

Zn+H2SO4====ZnSO4+H2 ZNSO4 is calculated to give about g solute fraction g 10g+3g

A: ......

Put it into dilute sulfuric acid or dilute hydrochloric acid respectively, observe the reaction rate, the fastest reaction is the most active, followed by the second, and the slowest means the weakest activity.

Metal activity order table, potassium, sodium, barium, calcium, magnesium, aluminum, zinc, iron, tin, lead, hydrogen, copper, mercury, silver, platinum.

A more reactive metal can be replaced from a less reactive metal salt solution.

1.Take two test tubes, add the same amount of dilute sulfuric acid, and then put two metals separately. There is no phenomenon in copper, and gas is produced in iron and aluminum, which is proven.

Copper is the least lively.

In summary, the activity of metals can be obtained: copper and iron.

2 In each of the three metals, dilute hydrochloric acid with the same mass fraction was added to observe the magnitude of the bubble production velocity, and in this experiment, gas was generated.

The greater the bubble velocity, the more active the metal is. If it is an experimental operation test, it should be noted that when the metal is put into the test tube, the "one horizontal" is to pick up the test tube horizontally, the "second send" uses tweezers to put the metal into the middle of the test tube, and the "three tilts" tilt the test tube at a certain angle to make the metal slowly slide to the bottom of the test tube. When pouring dilute hydrochloric acid, pay attention to the contact between the mouth of the fine-mouth bottle and the mouth of the test tube, the label towards the palm, the stopper upside down on the table, and the test tube slightly tilted.

3 Iron, copper, silver element.

Take the same amount of the following solution: ferrous nitrate, copper nitrate, silver nitrate solution, and then take the same amount of three metal inputs.

Copper is put into a silver nitrate solution and a silvery-white solid is generated: copper and silver.

Iron is put into a solution of copper nitrate and a red solid is formed: iron copper.

Iron is put into a solution of silver nitrate and there is a silvery-white solid to form: iron silver.

To sum up, iron, copper, silver.

4 Brass is reacted with heated concentrated nitric acid.

The color changes to blue.

The phenomenon is obvious.

And ** does not react with concentrated nitric acid.

That's the difference.

1: It can be violently reflected with weak acids, such as magnesium and weak acids.

Iron and weak acid reactions.

Cu and weak acids are not reflected.

3: You can use the method of substitution, for example.

Iron is put into a solution of copper sulfate, and soon the iron is replaced with copper.

However, silver does not react, which proves that Fe is lively, Cu is second, and silver is the most stable4: Speak ** and brass in dilute sulfuric acid.

Brass reflects the release of bubbles, ** does not react.

The metallicity of Mg>mn>Fe>Cu elements is often consistent with the order of metal activity of the element, which is the basis for judging the strength of metallicity.

1. According to the metal activity sequence table (except for a very few). The higher the position, the more metallic it is.

2. The difficulty of reacting with water at room temperature. The easier it is to react with water, the stronger the metallicity.

3. The difficulty of reacting with acid at room temperature. The easier it is to react with acids, the stronger the metallicity.

4. Displacement reaction between metal and salt solution. Metals with strong metallicity can replace metals with weak metallic properties.

5. The oxidation of metal cations (except for a very few). The stronger the oxidation of the cation, the weaker the metallicity of the corresponding metal.

6. The alkalinity of the most ** oxide corresponds to the hydrate. The more alkaline it is, the stronger the metallicity of the corresponding element.

7. In the same period, from left to right, with the increase of the number of nuclear charges, the metallicity weakens. In the same main group, from top to bottom, with the increase of the number of nuclear charges, the metallicity increases.

The order of activity of metals from strong to weak is mg, mn, fe, cuYou can put it in hydrochloric acid to compare the speed of the bubbles.

The order of activity of metals from strong to weak is mg, mn, fe, cu

The reactive nature of metals, i.e. how easily a metal loses electrons and is oxidized.

The following experimental verification can be designed:

The same mass of magnesium, zinc, copper, iron into the same mass and concentration of hydrochloric acid or sulfuric acid solution, interval time, weighing, the smaller the weight, the more active. (Reason: The more active and the more intense the reaction, the more gas is lost after the same reaction time, so the weight is smaller).

Hope the above experiments are helpful to you.

Mn elemental is able to displace iron from the salt solution of iron, proving that the metal activity of manganese metal is stronger than that of iron. The first reaction produces more bubbles than the second reaction. It is proved that the metal activity of manganese metal is stronger than that of iron.

Mn+4HCl=MnCl4+2H2 Fe+2HCl=FeCl2+H2 The bubble velocity produced by the first reaction is much faster than that of the second reaction. It is proved that the metal activity of manganese metal is stronger than that of iron.