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When we look at the things around us such as water, beverages, oil, food, etc we always wonder what they are constituted with. All the substances around us can be broadly divided into two main categories that are pure substances and mixtures.
Pure Substance vs Mixture
The difference between pure substance and mixture is that the pure substance consists of one kind of component present in the definite composition whereas the mixture is the substance that consists of more than one component which does not exist in the fixed composition.
The pure substances are the substances that are made up of similar kinds of particles and cannot be broken down further into different substances with the physical or the chemical processes.
Mixtures are the substances that are made up of the combination of two or more substances and these substances can be separated by the physical and the chemical processes.
Some of the examples of pure substances can be pure water, gold, platinum, etc whereas some of the examples of the mixtures can be carbon dioxide gas, sugar, alcohol, etc.
Comparison Table Between Pure Substance and Mixture (in Tabular Form)
|Parameters of comparison||Pure Substance||Mixture|
|Definition||Pure substances are those substances that are made up of only one component present in the fixed proportion.||Mixtures are the substances that are made up of the combination of two or more substances in different proportions.|
|Properties||The chemical and the physical properties of the pure substances remain the same throughout.||The chemical and the physical properties generally vary due to the presence of more than one compound.|
|Categories||A pure substance can generally be categorized in the form of solids, liquids, or gases.||The mixtures are broadly divided into homogeneous and heterogeneous mixtures.|
|Melting and Boiling Points||The melting point and the boiling points of the pure substances remain the same because of the one component.||The melting point and the boiling point of the mixtures depend on the presence of the different compounds.|
|Examples||Examples of pure substances can be H2 gas, oxygen gas, gold, pure water, etc||Examples of the mixture can be- sugar, sand, alcohol, ammonia, etc.|
What is Pure Substance?
A pure substance is a substance that comprises of only one kind of components present in the definitive ratio. These components cannot be separated by any physical or chemical processes. The color, texture, and size of all the components present in the substance are the same.
These substances can be categorized into solids, liquids, and gases depending on the nature of the particles present. The melting point and the boiling point of these substances remain the same throughout because all the constituent particles have similar properties.
Elements and molecules are pure substances because they are made up of identical particles. Some examples of elements are gold, silver, etc and that of molecules are H2 (Helium gas), O2 (oxygen gas), etc.
Some of the properties of the pure substance are listed below;
- They are made up of similar kinds of particles present in the fixed ratio.
- They have consistent melting and boiling points.
- The conductivity of such particles depends on their purity.
What is Mixture?
A mixture is a substance made up of the combination of two or more substances together present in different ratios. These substances are not bonded chemically and never show similar chemical and physical properties. Such substances are usually called impure substances because of the presence of different particles.
The components in the mixtures are separated by various physical and chemical processes. Some of the methods of separation are- filtration, sedimentation, distillation, centrifugation, etc.
The melting point and the boiling point of the mixture is different depending on the particles present in it. Some of the examples of the mixture are – cold drinks, alcohol, sand, water, sugar, etc.
Mixtures can further be divided into the homogeneous and heterogeneous mixture. This is depicted as follows:
- Homogeneous Mixture: It is the type of mixture where the particles are present in the uniform composition and are not visible with the naked eye. Example- salt and water solution
- Heterogeneous Mixture: It is the type of mixture where the particles are not present in the uniform composition and are visible through the naked eye. Example- different nuts put together in a bowl.
Main Differences Between Pure Substance and Mixture
- A pure substance is a substance made up of one component whereas a mixture is a substance that is made up of the combination of two or more components.
- The chemical and the physical properties of the pure substance remain the same throughout but they change in a mixture.
- The components of the pure substance can’t be separated by the physical and the chemical processes because they are bound chemically whereas components of a mixture can be separated.
- The melting and boiling points of the pure substance do not change whereas they vary in a mixture.
- The pure substance can be differentiated as solids, liquids, and gases whereas a mixture can be categorized as a homogeneous or heterogeneous mixture.
In our everyday mundane routine, we come across several substances that can be categorized as pure substances or the mixture. The pure substances are those substances that consist of similar particles in a constant proportion. The mixtures are the substances that are made up of two or more components mixed in different proportions.
The components of the mixtures can be separated by the physical and the chemical processes whereas the components of the pure substance are chemically bound and cannot be separated. The physical and the chemical properties such and melting and the boiling points of the components of the pure substance remain the same whereas they vary differently in a mixture.
Some of the examples of pure substances are gold, platinum, copper, nitrogen gas, oxygen gas, pure water, etc. whereas that of the mixture is sugar syrup, alcohol, sand, oil, etc.
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