Is Matter Around Us Pure?

Class 9 Science Chapter Explained

What is Matter?

Matter is anything that has mass and occupies space. Examples include air, water, sugar, and more. Matter exists in three states:

• Solid
• Liquid
• Gas

Classification of Matter

Matter can be broadly classified into Pure Substances and Mixtures.

1. Pure Substances

A pure substance is made of only one type of particle. It has uniform composition and properties.

• Elements: Consist of only one type of atom. Examples: Gold, Oxygen.
• Compounds: Formed by chemically combining two or more elements in a fixed ratio. Examples: Water, Carbon dioxide.

2. Mixtures

A mixture contains two or more substances physically combined. It is further divided into:

• Homogeneous Mixtures: Uniform composition throughout. Examples: Saltwater, air.
• Heterogeneous Mixtures: Non-uniform composition. Examples: Sand and water, oil and water.

Types of Mixtures

• Solution: A homogeneous mixture where solute is dissolved in solvent (e.g., salt in water).

• Suspension: A heterogeneous mixture where solid particles are dispersed in a liquid but do not dissolve (e.g., chalk powder in water).

• Colloid: A heterogeneous mixture that appears homogeneous to the naked eye (e.g., milk, fog).

Physical vs Chemical Changes

Physical Change	Chemical Change
No new substance is formed.	New substance is formed.
Reversible process.	Irreversible process.
Example: Melting of ice.	Example: Rusting of iron.

Matter Chart Diagram

Conclusion: The matter around us can be pure or impure. Understanding this helps in everyday applications like purification and separation techniques.

For more Class 9 Science topics, stay tuned!