CBSE Class 6 Science Revision Notes Chapter 5 – Separation of Substances

Learn from School Connect Online in this chapter we will learn the things,like We all have seen our ancestors separating small stones or pebbles from the rice grains, pulses, filtering tea leaves before serving tea and lot more. The practice of separation of substances is usually required to remove or separate the required substances from their mixtures.CBSE Class 6 Science Revision Notes Chapter 5 – Separation of Substances

The different topics covered in CBSE Class 6 Science Chapter 5 are tabulated below:

Ex : 5 – Separation of substances

There are many instances when we notice a substance being separated from a mixture of materials.

Ex : Tea leaves are separated from the liquid with a strainer, while preparing tea.

Separation :

We carry out the separation of the components of a mixture or an impure substance with the following purposes:

• To remove the unuseful or harmful component.
• To obtain the useful component.
• To remove impurities for getting a pure sample.

Ex : 5.1 – Methods of Separation

Handpicking, winnowing, sieving, magnetic separation, sedimentation, decantation, loading, filtration, evaporation, sublimation, distillation, churning, etc., are some common methods of separation.

Sedimentation :

It is the process of settling heavy solid particles in a mixture at the bottom of the vessel.

Decantation :

It is the transfer of clean liquid from one vessel to the other without disturbing the settled (sedimented) particles.

Evaporation :

It is the process of removing water (or moisture) from a mixture either by heating on flame or direct sunlight. For example, salt from sea water is obtained by this method.

Condensation :

The process of conversion of water vapour into its liquid form is called condensation.

Solution :

When a soluble substance is dissolved completely in a liquid (say sugar in water), a homogeneous mixture is formed. It is known as a solution.

Saturated solution :

A solution in which no more soluble substance can be dissolved at room temperature is called saturated solution.

Churning (or Centrifugation):

It is the process of separation of the lighter particles of a suspended solid from a liquid. For example, to obtain butter from the curd or milk.

Filtration:

The process by which two substances (an insoluble solid and a liquid) are separated by passing the mixture through a filtering device is called filtration.

Hand-picking:

Rice, wheat, pulses, etc., that we buy from the market may contain impurities (unwanted or harmful particles) in the form of small stones, unwanted grains, etc. Often, these impurities look very different from the food item and can be spotted easily.

Winnowing:

The method used to separate chaff from the grain by wind or blowing air is called winnowing.

Conclusion :

In the chapter : Separation of Substances we learned that because of the different physical and chemical properties of mixtures, it is possible for us to separate a solution into its original components.

CBSE Notes for Class 6 Science Free Download for All Chapters

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