OxScience

Pure substance

It is a substance that has an invariable and homogeneous chemical composition. It can appear in different phases: solid, liquid, and gas depending on the pressure and temperature to which it is subjected. It can also occur in two or three phases at the same time.

Although it sounds surprising, there are several situations in which two phases of a substance can coexist in equilibrium.

Mixture

Mixtures are materials formed by the union of two or more components that have not been chemically united. This means that in a mixture there are no chemical reactions and each of its components maintains its properties and its identity.

Mixtures do not have chemical reactions, but they can be reactive, that is, their components can react if they are subjected to certain environmental conditions.

The mixture is considered to be the physical combination of two or more substances that maintain their identities. A mixture is the result of the mechanical mixing of chemical substances without these forming bonds or reactions.

Mixtures can be separated into their components by physical or thermal processes.

Mixtures can be classified into:

• Homogeneous: They can be classified into coarse mixtures, suspensions, colloidal dispersion, and chemical suspension.
• Heterogeneous.

suggested video:  Pure Substance and Mixture

Differences between Pure Substance and Mixture

• Pure substances are those that have a uniform or fixed composition. It has chemical and physical properties and has characteristic properties.
• A mixture is the union of different molecules that do not react chemically with each other. They can be formed by sets of compounds or elements.
• The mixtures do not have specific melting or boiling points, that is, they do not have characteristic properties. They can react if they are subjected to certain conditions.