NCERT Science 2nd Chapter (IS MATTER AROUND US PURE?)

NCERT Science 2nd Chapter

(IS MATTER AROUND US PURE?)

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2.1 What is a Mixture?

Mixtures are constituted by more than one

kind of pure form of matter. We know that

dissolved sodium chloride can be separated

from water by the physical process ofevaporation. However, sodium chloride is itself

a pure substance and cannot be separated by

physical process into its chemical constituents.

Similarly, sugar is a substance which contains

only one kind of pure matter and its

composition is the same throughout.

Soft drink and soil are not single pure

substances. Whatever the source of a

pure substance may be, it will always have

the same characteristic properties.

Therefore, we can say that a mixture

contains more than one pure substance.

2.2 What is a Solution?

A solution is a homogeneous mixture of two

or more substances. You come across various

types of solutions in your daily life. Lemonade,

soda water etc. are all examples of solutions.

Usually we think of a solution as a liquid that

contains either a solid, liquid or a gas

dissolved in it. But, we can also have solid

solutions (alloys) and gaseous solutions (air).

In a solution there is homogeneity at the

particle level. For example, lemonade tastes the

same throughout. This shows that particles of

sugar or salt are evenly distributed in the

solution.

Sl. no.	Dispersed phase	DispersingMedium	Type	Example
1	Liquid	Gas	Aerosol	Fof, Cloud, Mist
2	Solid	Gas	Aerosol	Smoke, automobile exhaust
3	Gas	Liquid	Foam	Shaving cream

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