Free Iron Elemental Iron Free Iron Free Fe2O3 What? 5

Free iron: It is elemental iron. The free state of an element refers to the elemental form of the element.

The iron in Fe2O3 is 3-valent and is called iron oxide, which is chemically called ferric oxide, commonly known as iron red.

The iron in Fe0 is 2-valent and is called ferrous oxide. Its mineral form is galena.

Common ferrites also include Fe3O4, which is called ferric tetroxide. It is also known as iron oxide black, magnet, magnet, and black iron, which is a magnetic black crystal, so it is also called magnetic iron oxide.

Free iron is elemental iron.

The iron in Fe2O3 is 3-valent and is called iron oxide;

The iron in Fe0 is 2-valent and is called ferrous oxide.

2-valent iron is ferrous iron.

Free iron is elemental iron, and free iron oxide is pure iron oxide.

There are two states of iron elements, namely chemical state and free state. The one that exists in the form of a single substance is the free state, and the chemical state is the one that exists in the form of a compound. In elemental matter, the valency of the element is 0

The valency of iron in iron oxide is +ferrous oxide) and the valency of iron is +2When the valency is +3, it is read as iron, and when the valency is +2, it is read as iron. Therefore, you can know its valency from the reading.

Free iron: It is elemental iron. The free state of an element refers to the elemental form of the element.

The iron in Fe2O3 is the 3-valent iron oxide, which is chemically called ferric oxide, commonly known as iron red.

The iron in Fe0 is 2-valent and is called ferrous oxide. Its mineral form is galena.

Common ferrites also include Fe3O4, which is called ferric tetroxide. It is also known as iron oxide black, magnet, magnet, magnet, black iron, which is a magnetic black crystal, so it is also called magnetic iron oxide.

Question 1: What color are iron ions pale yellow.

Question 2: What is the main component of iron ions hemoglobin, hope.

Question 3: What is the color of 2-valent iron ions and 3-valent iron ions Fe2+ is light green, and Fe(OH)2 is generally considered white.

Fe3+ varies from light yellow to dark yellow and even brownish yellow depending on the concentration, the higher the concentration, the darker the color, and this is actually the result of the hydrolysis of iron ions.

The true hydrated iron ion [Fe(H2O)6]3+ is light purple, and the solution of iron salt can be seen in the case of strong acidity and no Cl- combination. But don't write that in middle and high school! Don't blame me for not reminding you, whether you want to divide or the truth, you weigh it yourself.

Question 4: Are iron ions and iron both iron elements The classification of elements only depends on the number of protons in the nucleus, that is, the charge number of the nucleus, and the difference between iron ions, ferrous ions and iron atoms is only the number of electrons outside the nucleus, or the difference between the number of positive charges and the number of negative charges, that is, the external appearance of electricity.

Question 5: What is the color of the solution of iron ions and ferrous ions The color of the solution containing Fe3+ is not certain, and the formation of different complexes [Fe(H2O)6]3+ is light purple, while [FeCln]3-N(n=1 4) is yellow, which is generally considered yellow by secondary schools.

Fe2+ ferrous ions are generally light green in color. Look

(1) The valency of FE element in the element is reduced, and Fe3+ is used as an oxidant, so the answer is: oxidation;

2) Taking vitamin C can convert Fe3+ in food into Fe2+", the valence of Fe elements in the reaction is reduced and reduced, which means that vitamin C is reducible and can be tested with oxidants such as potassium permanganate, so the answer is: reduction; Restore; c．

It is shown that iron has changed from a free state to a chemical state.

The iron in the original sample may be oxidized to ferrous oxide, iron oxide, ferric oxide.

Since iron is a solid, the sample must be tested as a solid.

If it contains iron oxide Fe2O3 or ferric tetroxide Fe0·Fe2O3, a small amount of iron sample (preferably ground into powder) can be dissolved in excess of dilute hydrochloric acid, because the dissolution of iron oxide takes a certain amount of time, it can be properly heated, and after the iron is completely dissolved, add KSCN solution (can identify the +3 valence of iron ions from Jianxiang), if the solution is blood red, the iron has become a chemical state.

If it doesn't turn blood red (there is also a possibility that FE part becomes FEO), I can't think of a better way for this, so I have to use a quantitative test, take another 56g iron sample, add a sufficient amount of dilute sulfuric acid to dissolve, collect the generated gas H2, and measure the volume under standard conditions, if the calculated H2 mass after measurement is less than 2g, the iron has deteriorated.

Of course, the experimental error can not be ignored, but I can't think of a better way to feast for a while) For iron salts and ferrous salts, the above methods can also be used, if it is a theoretical operation, it is better to use quantitative experiments.

Iron reacts with non-oxidizing acids to form ferrous ions.

Fe +2HCl == FeCl2 + H2 ferrous ions converted into iron elemental Fe2+ +Zn == Fe + Zn2+ iron in chlorine. The ferric ion 2Fe +3Cl2 === 2FeCl3 is formed in combustion

Ferrite is converted to iron Fe2O3+3Co=2Fe+3CO2 iron ions are converted to ferrous ions 2Fe3+ +Fe ===3 Fe2+ ferrous ions are converted to iron ions 2Fe2+ +Cl2 === 2Fe3+ +2Cl-