What are the main properties of oxides?
From the school chemistry program to each of usit is known for sure that oxides are rather complex chemical substances, which are compounds of fairly simple elements with a gas such as oxygen. There are salt-forming oxides and oxides that do not form salt. The former are further divided into three categories: acidic, basic and amphoteric. Let's look at the chemical properties of oxides.
To this type of oxides are complexchemical substances that are capable of forming salts upon reaction with acids or oxides, but do not react with basic oxides or bases. For example, the following are the main oxides: potassium oxide, calcium oxide, ferrous oxide.
Now, let's take an example of the properties of the basic oxide.
1. Reaction with water. Entering the interaction in H2Oh, the basic oxide forms alkali. For example, the reaction of quenching lime. CaO + H2O = Ca (OH)2.
2. Reaction with acids. By reacting with acids, water and salts are formed, for example CaO + H2SO4= CaSO4+ H2O.
3. Reaction with acidic oxides. When interacting with acid oxides, salt is formed. For example, CaO + CO2= CaCO3- education formulachalk.
This is the so-called complex chemicalsubstances that refer to oxides and interact with basic oxides or bases, form salts. An example is carbon dioxide CO2,sulfur trioxideSO3.The properties of the oxides are as follows:
-acid oxides can react with water. For example, it is in this way that carbonic acid CO2+ H2O = H2CO3.
- with alkalis or bases. An example is the following CO2+ NaOH = Na2CO3. As a result, there should be nothing else butcalcined or washing soda. It is an excellent remedy for removing dirt and grease from the surface of pans. Also with the help of this tool, some landladies remove burnt areas.
- reaction with basic oxides. Example - CO2+ MgO = MgCO3, the production of magnesium carbonate.
Such oxides are called complex chemicalsubstances that can also be attributed to oxides that form nothing more than salts in the process of chemical reaction with acids or bases. Most often we are accustomed to using the word "amphoteric" when talking about metals. In part this is correct, because in this case oxides are called amphoteric, because they react with metals.
As an example of an amphoteric oxide, zinc oxide ZnO, which is widely used in medicine or aluminum oxide Al2O3.
The main properties of oxides reacting with metals are that they are able to react not only with acids, but also with bases.
An example is the interaction of an amphoteric oxide with an oxygen oxide, which results in ZnO + H2CO3= ZnCO3+ H2O.
In the same way, a double salt of zinc and sodium is also obtained. Such reactions usually occur with increased energy release.
In order to understand what this or that reaction looks like, there is not enough one description, it is necessary to do it yourself in the laboratory.