What are the chemical properties of metals ?
such thing as chemical properties of metals, very often used in the school curriculum.Let's try to consider, what are the most basic of their chemical properties.
solubility of metals
This is the name of the metal's ability to dissolve in a specially designated for this business solvent.Such a solvent may be a caustic alkali and strong acid.If we talk about the industry, the most popular are hydrochloric acid and nitric acid, and mixtures thereof, which is popularly referred to as the "aqua regia".The metal in the reaction time may not immediately "dissolve", only be subject to damage its upper layers.But sometimes after the reaction with such a solution turns into a metal powder.
For example, if you just need to get a smooth surface by means of etching, it is desirable to use a liquid to partially dissolve the metals.Oxidation
This property demonstrates the ability of certain metals to interact with a gas such as oxygen, as well as the ability to form oxides.Sometimes this property allows metals to get the full corrosion resistance for a long time, which is required for operation in adverse weather conditions.Also, oxidation is used in welding and brazing metal, so that the film interferes with the direct touch to the clean surface of the metal.We continue to consider what the general chemical properties of metals exist today.
Resistance to corrosion
This feature allows the metal to resist destruction under the adverse influence of the environment.If we look at the process from a chemical point of view, we can see that it is caused by a very important problem, as oxidation.When the moisture on the surface of the metal, oxygen reacts with the metal surface and act thereon corrosion.Reacting the metal with another metal, they form the so-called galvanic couple in which electromotive force is much greater than in each metal individually.When the metal reacting with the gases they create a complex process, which is directed towards equilibrium.
If we talk about the real world, in which the balance is rarely achieved, which is why the thermodynamic calculations, which relate to the determination of the equilibrium state, show only the direction of the interaction.
There are several cases when interacting with oxygen, alkali metals.The chemical properties similar to those of the general category properties.
If we talk about the interaction of alloys with gases, it may be noted three cases:
- absolute mutual intensity, which occurs during melt completely different metals in the environment of such gases, such as helium and argon.
- Gas completely dissolved in the metal.Such a reaction is observed during the reaction with the metal liquid droplets, which penetrate into the metal, and there it pollutes.
- gases in contact with the metal forming solutions.
reaction with oxygen
best thing any metals react with a gas such as oxygen.If we talk about low-melting metals, they can not be dissolved oxygen, all that they will do - is to obtain the oxide film on the surface of the metal itself.Chemical properties
alkaline earth metals allow oxygen to dissolve, but only in certain quantities and only after that the oxides are formed.
reaction with nitrogen
One of the most unusual endothermic process is the dissolution of nitrogen in nickel, manganese or iron.The result of this process will be the formation of gas porosity.
With regard to titanium, the nitrogen dissolved in it, and allocates a considerable amount of heat.The liquid metals dissolved nitrogen content in proportion to its other components.
If we consider metals such as tin and copper, for them is nothing but nitrogen as an inert gas.
reaction with water
The interaction may occur completely different reactions, depending on how the water reacts with the metal.The melt may be subjected to oxidation in a hydrogen atmosphere leaves or together hydrogen and oxygen dissolve and disappear.
These are the basic chemical properties of metals.Thus it is not so great that list, which is formed by the chemical properties of metals.Grade 9 is left behind, but thanks to this article, you will remember that at that time taught in school.