Class 7 Chapter 6 Physical and Chemical Changes

Introduction

• We notice many changes taking place around us on their own.
• For instance, flowers bloom and wither with time, and crop changes from time to time. Changes take place in our body also like an increase in height and weight etc.
• When one or more properties of a substance become different or something new is formed, it is known as a change.
• For example, the burning of fireworks, formation of curd, ripening of fruits, and drying of clothes.
• Changes are of two types: physical and chemical change.