Is Matter Around Us Pure (Chapter 2): CBSE Class 9 Science (Chemistry) | Part 1

Is Matter Around Us Pure (Chapter 2): CBSE Class 9 Science (Chemistry) | Part 1
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Here we describe the topic of Is Matter Around Us Pure from class 9 science chemistry.

Let’s jump into it,
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.

What is Pure substance?

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.


What is Matter?
Anything which occupies space and has mass is called “matter” or anything which has volume and mass is called “matter”.

For example. Mobile, mountains, ball pen, air, water etc.

Basic types of matter are solid, liquid and gas.
The fundamental difference between these types is the gap between particles.

Properties of matter:

– The matter is made up of small particles.
– These small particles are very small.
– These small particles have space between them.
– These particles are doing random motion.
– When particles made move in random motion or way, it called Random motion or Brownian motion.
– These particles attract each other.

There are mainly three (3) types of matter.

1) Elements
For ex. Gold, Silver

2) Compounds
For ex. Water, Salt

3) Mixtures
For ex. Soil, Coke

All the atoms in an element are identical to each other.
Simple examples are Iron, Copper, Carbon, Oxygen, Aluminum, Gold, Silver, Neon etc.

The compound is a pure substance made up of two or more elements combined chemically in a definite ratio.

All the atoms in a compound are not identical to each other.
1) A compound is made up of atoms from two or more elements.
2) In a compound, atoms form a group called “molecule”.
3) There are many molecules in a compound.
4) Atoms in a molecule are tightly bound to each other.

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