Difference between pure substance and mixture

Main difference

Everything in this world that occupies space is defined as matter. The matter can be divided into two main categories, pure substance or mixture. A pure substance is made up of the same types of molecules, elements and compounds are the basic examples of such matter, while the mixture is made up of two different types of molecules, homogeneous mixtures and heterogeneous mixtures are the main types of mixtures. . The Pure Substance as its name refers to exists in the purest form possible, it has no impurities inside and the same composition and properties everywhere, and on the other hand, the mixture is the combination of two or more different molecules, and each of the constituents tries to retain its identity in them. Furthermore, mixtures are formed without any chemical reaction between the substances;

Comparative chart

Pure substance Mixture
Definition A pure substance is made up of the same type of molecules. The mixture is made up of two different molecules.
Properties and composition Pure substances have similar properties and composition throughout. In mixtures, the properties and composition vary since the constituents are mixed in an indefinite proportion.
Impurities A pure substance is in the purest form and has no impurities. The mixture has impurities or is made up of two or more substances.
Melting and boiling point Pure substances have a sharp melting and boiling point and a standard melting or boiling point. The boiling and melting points of the mixtures vary according to the proportion of components.
Example Water is an example of a pure substance. Salt mixed with water is an example of a mixture.

What is the pure substance?

Pure substances are the type of matter that is made from the same type of molecules. They have a sharp melting and boiling point, as they exist in the purest form. To determine whether the substance is pure or not, the chemical method to verify purity is applied. Pure substances have similar properties and composition throughout. As they are in their purest form, they cannot be divided into different components even through the use of chemical or physical processes. Pure water is one of the basic examples of a pure substance, although this water becomes a mixture sooner when impurities or other substances mix in it.

What is mixing?

A mixture is the combination of two or more pure substances in such a way that they are not chemically linked. The entry of each pure substance into the mixture influences the mixture, as it manifests itself in the type of properties. For example, when making a mixture of sugar and water, the solution obtained will have a sweet taste due to the presence of sugar, which has the property of sweetness. When mixtures are made, they can be mainly of two types; homogeneous mixture and heterogeneous mixture. Homogeneous mixture is the combination of two or more pure substances so uniformly that each of the substances is indistinguishable from the other substance. On the other hand, pure substances in heterogeneous mixtures are not uniformly distributed and result in the formation of a non-uniform composition.

Pure substance versus mixture

  • A pure substance is made up of the same type of molecules, while the mixture is made up of two different molecules.
  • Pure substances possess similar properties and composition throughout, on the other hand, in mixtures, the properties and composition vary as the constituents are mixed in an indefinite proportion.
  • A pure substance is in the purest form and has no impurities, while the mixture has impurities or is made up of two or more substances.
  • Pure substances have a sharp melting and boiling point and a standard melting or boiling point, contrary to this, the boiling and melting points of mixtures vary according to the proportion of constituents.
  • Water is an example of a pure substance, on the other hand, salt mixed with water is an example of a mixture.

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