Iron is silvery white, why is the iron produced by carbon monoxide reduced iron oxide black?

The iron you mentioned refers to the iron products that we commonly see in our daily life, and Fe3O4 is usually powdered, and the iron powder is black, so the powdered iron that Fe3O4 is reduced is naturally black.

The iron produced by reducing the powder of iron oxide with carbon monoxide is in powder form, which reflects less light and absorbs visible light, so it is black when seen, which is related to the reflection of light. The surface of the iron products in life is very smooth, the structure is relatively tight, and there is a strong reflection of light, so what you see is silvery white.

Iron oxidizes and turns black. Because of the ironChemical propertiesIt is more lively, coupled with the fact that iron generally contains carbon impurities, and iron carbon will form miniature galvanic cells, resulting inGalvanic corrosion。In addition, the rust is fluffy and absorbs water, and once the iron rusts, it will accelerate the oxidation of the rest of the iron.

Iron is susceptible to rust not only because of its chemical activity, but also because of external conditions. Moisture is one of the substances that makes iron rust easily. However, only water does not rust iron, and iron oxide is formed only when oxygen in the air is dissolved in water, and the oxygen reacts with iron in the presence of water.

Stuff, that's rust.

Iron:

Iron is one of the most widely used metals by humans and one of the metals that have been used for the longest time. Iron is flexible and malleable.

of silvery-white metal. Iron is one of the most widely distributed metals on Earth, accounting for about the mass of the Earth's crust, ranking fourth in the sequence of elemental distributions, after oxygen, silicon and aluminum.

Iron-carbon alloy voltification town containing 2% carbon content.

Called pig iron. Pig iron is hard and brittle, but it is pressure and wear-resistant. According to the different forms of carbon in pig iron, it can be divided into white iron, gray iron and ductile iron.

The fracture of white iron is silvery-white, hard and brittle, and cannot be machined, so it is the raw material for steelmaking, so it is also called steelmaking pig iron. Carbon is distributed in the form of flake graphite, which is called gray iron, with silver-gray fractures, easy to cut, easy to cast, and resistant to coarse wear.

The above content reference: Encyclopedia - iron.

The color of iron oxide is reddish-brown. Iron oxide is ferric oxide, the chemical formula is Fe2O3, and it is a reddish-brown powder. Iron oxide is insoluble in water.

It has strong hiding power and tinting strength, and is free of oil and water permeability. Iron oxide is stable in the atmosphere and sunlight, resistant to dirty gases, high temperature and alkali.

Iron oxide is the main component of rust and hematite. The main cause of rust is the rust of iron metal in the presence of impurity carbon, which reacts with water and oxygen in the environment.

As a commonly used colorant in glass production, iron oxide-colored glass can absorb both ultraviolet and infrared rays, so it is widely used in the manufacture of heat-absorbing glass, sunglasses glass, industrial protective glasses glass and military anti-infrared coatings. At the same time, it has the function of low price, absorption and ultraviolet rays.

In addition, iron oxide pigments are also widely used as colorants and protective agents for wood coating. The use of transparent iron oxide pigments instead of traditional pigments preserves the clear grain of the wood, and the high lightfastness of the furniture makes the color of the furniture unchanged for a long time.

There are three common oxides composed of iron: Feo (ferrous oxide), Fe2O3 (ferric oxide), and Fe3O4 (ferric tetroxide). Both ferrous oxide and Fe3O4 are black.

The phenomenon of carbon monoxide reducing iron oxide is that the red powder does not turn black, and the clarified lime water becomes turbid.

Carbon monoxide reduces iron oxide: 3CO + Fe2O3 = high temperature = 2Fe + 3CO2, phenomenon: red powder does not turn black, clarified lime water becomes turbid. (The main reaction principle of iron smelting).

Iron is made by reducing iron oxide with carbon monoxide, mainly by using the reducibility of CO to react with iron oxide at high temperature to produce iron and carbon dioxide. When burned, it emits a blue flame and emits a large amount of heat. The carbon monoxide molecule is an unsaturated metastable molecule that is chemically stable in terms of decomposition.

At room temperature, carbon monoxide does not react with acids, alkalis, etc.

However, it can be mixed with air to form a first-class mixture, which can cause combustion in case of open flame and high temperature, which is a flammable and explosive gas. Because the valency of carbon in the carbon monoxide molecule is 2, it can be oxidized to 4 valence, which is reducible; And it can be reduced to a low-valence state, which has oxidizing properties.

Chemistry Experiment Operation:

Chemical experiment operation, specifically refers to the laboratory drug take, storage, instrument connection assembly and washing, etc., mainly introduces the principles and steps that must be followed in the operation, in the specific experiment should be strictly followed these steps to carry out the experiment, in order to prevent accidents or lead to experimental errors.

Do not touch the medicine with your hands, do not put your nostrils to the mouth of the container to smell the smell of the medicine (especially gas), if you need to know the smell of the medicine, you can use your hand to gently fan the smell of the medicine. Do not taste any medicines. Pay attention to saving medicines.

The drug should be taken strictly according to the dosage specified in the experiment. If the dosage is not stated, the minimum amount should generally be used: 1 2 ml of liquid, and only the bottom of the tube should be covered with solids.

The remaining drugs from the experiment should not be put back in the original bottle, nor should they be discarded at will, let alone taken out of the laboratory, but should be placed in the designated container.

The color of iron oxide is red or crimson. Iron oxide is an inorganic substance, usually a red or dark red powder, with a relative density of 5 to 1565 degrees Celsius. Iron oxide is insoluble in water, but soluble in sulfuric acid or hydrochloric acid, and orange peel leak is slightly soluble in hydrochloric acid.

Iron oxide has strong tinting strength and covering power, and is free of oil and water permeability.

1. Physical properties: The properties of iron oxide are very stable in the atmosphere and sunlight, and iron oxide can withstand high temperatures, turbid gases and alkalis.

2. Chemical properties: iron oxide and acid can react to form salts, and iron oxide also has oxidizing and alkaline oxide properties.

3. Application field 1: Iron oxide can be used for magnetic purposes, such as computers, printing equipment, radio and television, radar navigation, etc.

4. Application field 2: Iron oxide is also round and rotten and can act on some relatively high-grade automotive coatings, and iron oxide is one of the better environmentally friendly coatings.

The experimental phenomenon of carbon monoxide reduction of iron oxide is that the red powder turns black, and the clarified lime water becomes turbid

Carbon monoxide is a reducing agent that can reduce many metal oxides to metal elements at high temperature or when heated, so carbon monoxide is usually used in metal smelting.

Carbon monoxide is reducible, and its properties determine that it is mainly used for metal smelting in life, and there are two reasons for carbon monoxide to reduce iron oxide:

One is to lay the foundation for the smelting of metals in the second volume of the ninth grade;

Second, because the inference questions of the high school entrance examination often test similar knowledge points of carbon monoxide reduction and metal oxides, and many students do not have a solid foundation, and there are often some small mistakes in the writing of chemical equations.

The idea is that students design on the basis of carbon reduction and carbon reduction of copper oxide, and write the products in the reaction according to the experimental phenomenon, so as to remember the chemical equation of carbon monoxide reduction of iron oxide more deeply.

Since the CO molecule is bound by a triple bond, the bond length of CO is shorter than that of the general carbon-oxygen double bond, and the bond energy is larger than that of the general carbon-oxygen double bond. At the same time, because the electronegativity of the O atom is higher than that of the C atom, the electron cloud should be biased towards the O atom, so that the Co molecule should have a larger dipole moment, but the electron pairs that form the coordination bond in the Co molecule are provided by the O atom alone, so that the electron cloud is fed back to the C atom, which compensates for the polarity caused by the difference in electronegativity between the O atom and the C atom to a certain extent, so that the dipole moment of the Co molecule is very small, which is consistent with the fact that the dipole moment of the Co molecule is very small.

To change oxidized iron back to its original color, you can take the following methods:

1.Mechanical removal of the oxide layer: Using tools such as sandpaper, wire brushes, or a slush machine, the oxide layer can be rubbed off from the surface. However, this method is only suitable for mildly oxidized iron, and does not work well for heavily oxidized iron.

2.Pickling: The oxidized iron is soaked in an acidic solution, such as hydrochloric acid or sulfuric acid.

The acidic solution dissolves the oxide layer, thus restoring the original color of the iron. But you need to be careful when using acidic solutions, make sure you do it in a well-ventilated area, and wear protective gloves and goggles.

3.Chemical reducing agent: Exposure of oxidized iron to a reducing agent can reduce the oxide and restore it to metallic iron.

Common reducing agents include hydrogen, hydrogen sulfide, sulfites, etc. When using chemical reducing agents, follow safe operating practices and take care to avoid the production of harmful gases.

4.Prevent the re-oxidation of the vertical potato: In order to maintain the original color of the ironware, the pure person can take preventive measures, such as applying anti-rust paint, lubricant or using anti-rust agent. This prevents air and moisture from coming into contact with the iron, reducing the occurrence of oxidation.

It is important to note that when performing the above methods, it is important to follow safe operating practices and protect your body and environment.

The iron oxide turns from reddish-brown to black, indicating that the iron oxide has been reduced to iron and silver collapsed, but the gas produced is not carbon monoxide, but carbon dioxide.

Spread a thin layer of iron oxide in the test tube, pass in carbon monoxide, and ignite the carbon monoxide discharged from the nozzle, heat the test tube with an alcohol blowtorch, the iron oxide will turn black, and the clarified lime water will become turbid, indicating that the gas generated is carbon dioxide, not carbon monoxide.

The color of the iron is the destruction of the silvery white seepage, but the iron of the powder shirt is black.

The equation for carbon monoxide to reduce iron oxide is 3CO+Fe2O3==Heat of residual residue in the plexing ==3CO2+2Fe

Iron oxide is reddish-brown and is reduced to iron, while the iron in the front is in a powder state, so it is black.