5. Physical and Chemical Changes

Changes are a fundamental aspect of our daily lives which happen in various forms around us. 

What are Changes?

Changes refer to the transformation in the state or properties of a substance.

These transformations can be temporary or permanent, reversible or irreversible.

Examples:

1. When we make lemon juice we dissolve salt, sugar & lemon juice in water.
2. Making curd from milk.
3. Converting of ice to water on melting and then to water vapour on boiling water.
4. Cooking food (raw rice or dal is cooked to edible form).
5. Cutting paper for various craft activities.

These are some changes which we observe everyday around us.

Importance of understanding changes:

1. It helps us comprehend the world around us.
2. It allows us to predict the outcomes of certain processes.
3. It is essential for scientific studies & applications in fields of chemistry, biology & environmental science.

To Remember:

• Changes are all around us.

• Changes means change in state or property of a substance.

Changes are classified into two types:

They are:

Let's understand each change in detail.