Homogeneous is a term that refers to everything that belongs to or is linked to the same gender. The term comes from the Latin homogenĕus, although its oldest origin leads us to the Greek language.
The adjective refers to that which has the same characters. A mixture or a homogeneous substance, therefore, shows a uniform composition and structure. For example: “by dissolving a little salt in a jug of water, we obtain a homogeneous mixture by dissolving the first one”, “this substance is homogeneous: it is not possible to distinguish an element with the naked eye.
The homogeneous system is composed of a single phase. This means that, from the perspective of chemistry, they exhibit intensive properties of equal value in all their points of view.
The first step to follow to check if a mixture is homogeneous is the visualization: if it is not possible to distinguish different phases and components, the mixture complies with the homogeneity.
There are various classifications of homogeneous systems according to their characteristics, such as pure substances (composed of a single component) or solutions (a single visible phase is present, despite the fact that the system consists of at least one solvent and one solvent )
However, the presence of another series of homogeneous systems should not be overlooked as it would be in the case of open ones. As their name indicates, they are those systems that have the particularity that they allow the exchange of matter and energy with what would be the environment.
Second, there are those that are called closed. In this case, they are the ones that can exchange energy with the environment in which they are found, but they do not do the same with matter .
Similarly, lastly, it is necessary to highlight the existence of what are known as isolated systems. They are distinguished by the fact that no kind of exchange takes place in them.
In addition to all the above, it is important to determine that also at the scientific level there is what is known as homogeneous equilibrium. It is a term that is used to refer to all those reactions that arise when each and every one of the elements that intervene in them are in what would be the same phase, that is, in the same chemical states.
A clear example of a homogeneous equilibrium is what is called catalytic methanation. In contrast to the aforementioned, there is the heterogeneous equilibrium, it is the reaction that is generated when products and all kinds of reagents that intervene in it are not in the same phase. In this case we could consider that within that liquid, gases and even solids take center stage.
The opposite of homogeneity is heterogeneity related to the variety of chemical elements .
Examples of homogeneous mixtures
- White gold : this solid mixture is made up of at least two metallic substances. It is usually made from nickel, silver, and gold.
- Water with salt : in this case, the salt is diluted with the water, so it is not possible to detect both substances separately but rather they are displayed uniformly.
- Mayonnaise : this dressing is composed of substances such as egg, oil and lemon; that are evenly combined.
- Alpaca: this solid mixture is made up of zinc, nickel and copper, all substances that the human eye will not be able to detect with the naked eye.
- Wine: it is a substance that contains water, sugar, yeast and fruits that merge in a uniform way. It is a clear example of homogeneous mixtures.