Is Matter Around Us Pure l Part 1 - Introduction l Class 9 chemistry ll

Опубликовано: 02 Апрель 2025
на канале: CBSE বাংলা

Is Matter Around Us Pure l Part 1 l Class 9 chemistry ll #cbseবাংলা #chemistry

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Welcome to cbse বাংলা . In this video I will explain class 9 chemistry chapter 2, Is Matter Around Us Pure.

How do we judge whether milk, ghee, butter, salt, spices, mineral water or juice that we buy from the market are pure?

Have you ever noticed the word ‘pure’ written on the packs of these consumables? For a common person pure means having no adulteration. But, for a scientist all these things are actually mixtures of different substances and hence not pure. For example, milk is actually a mixture of water, fat, proteins etc. When a scientist says that something is pure, it means that all the constituent particles of that substance are the same in their chemical nature. A pure substance consists of a single type of particles. In other words, a substance is a pure single form of matter. As we look around, we can see that most of the matter around us exist as mixtures of two or more pure components, for example, sea water, minerals, soil etc. are all mixtures.

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 of evaporation. 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.

TYPES OF MIXTURES:
Depending upon the nature of the components that form a mixture, we can have different types of mixtures.
They are Homogeneous mixture and Heterogeneous mixture.

The mixture which has a uniform composition throughout. Such mixtures are called Homogeneous mixtures or solutions.
Example of Homogeneous mixture are alloy, sugar water, lemonade etc.

The mixtures, which contain physically distinct parts and have non-uniform compositions. Such mixtures are called heterogeneous mixtures.
Example of Heterogeneous mixture are sand water, soil water etc.

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