The word ” mixture “ is used to refer to the combination of at least two different substances, without there being a chemical reaction between them. Nevertheless, each of the substances maintains its chemical properties, that is, there are no chemicals CHANGES at all.
Two types of mixtures can be identified: homogeneous and heterogeneous :
- Heterogeneous mixtures : These are those in which the substances that make up the mixture (eg oil and water ) can be distinguished at first glance . That is why it is said that they are not uniform. since the substances do not combine. The same goes for a salad of, for example, lettuce and tomato.
- Homogeneous mixtures : On the other hand, they are characterized by being uniform. That is to say, that the human being will not be able to easily identify that it is at least two substances combined, since there is no discontinuity between them . Eg wine , gelatin , beer , coffee with milk .
Examples of homogeneous mixtures
- Wine: this substance, which contains water, sugar, yeast and fruits that are mixed uniformly is another example of homogeneous mixtures.
- Preparation of cake : this mixture can be composed of flour, milk, butter, eggs and sugar but, if we observe it with the naked eye we will not be able to identify all these ingredients, but we will see the preparation as a whole.
- German silver: this solid mixture is made up of zinc, copper and nickel, all substances that the naked eye can not detect.
- Coffee with milk: when we prepare a coffee with milk, it is like a homogeneous liquid mixture in which coffee, water and milk can not be identified at a glance. But we see it as a whole.
- White gold: this solid mixture is composed of at least two metallic substances. It is usually manufactured from nickel, silver and gold.
- Flour with icing sugar: this mixture that we use for cooking is also homogeneous. At first glance, both ingredients can not be detected.
- Air: this mixture is composed of various gaseous substances, such as carbon dioxide, nitrogen, oxygen and ozone, among other gases.
- Water with salt: in this case, the salt is diluted in water, so it is not possible to detect both substances separately, but they are seen uniformly.
- Mayonnaise: this dressing contains substances such as egg, lemon and oil, which combine evenly.
- Pizza mass: this dough, which contains flour, yeast, water, salt, among other ingredients, is homogeneous as they are mixed uniformly.
- Bronze: this alloy is an example of homogeneous substances since it is composed of tin and copper.
- Milk : this mixture that we see in a uniform way is composed of substances such as water and fats.
- Artificial juice : the powdered juices that are prepared with water are one more example of the homogeneous mixtures since they are united in a uniform way.
- Water and alcohol: no matter how hard we try, at first glance this liquid mixture is seen as a whole since water and alcohol mix uniformly.
- Steel: in this solid mixture it is an alloy of carbon and iron, which are mixed continuously.
- Gelatin: this preparation containing gelatin powder and water is homogeneous since both substances are mixed uniformly.
- Detergent and water: when dissolving detergent in water we are faced with a homogeneous mixture since a single base is identified.
- Chlorine and water: when these substances are placed in the same container it is impossible to detect them with the naked eye since they are formed in a single phase.
- Invar: this alloy can also be considered homogeneous since it is composed of nickel and iron.
- Alnico: it is an alloy composed of cobalt, aluminum and nickel.