Physical and Chemical Changes

In the Class 7 NCERT Science book “Science”, the chapter “Physical and Chemical Changes” helps you understand the difference between changes that only alter the appearance of a substance and those that form new substances. You learn how physical changes are usually reversible, while chemical changes are often permanent.

As you explore the chapter, you study important examples like rusting of iron and crystallization. You also understand how chemical changes involve the formation of new substances and may produce heat, light, or color change.

This chapter encourages you to observe changes happening around you and think scientifically about them. Through simple activities and real-life examples, you develop strong analytical skills and a deeper understanding of how substances transform in everyday life.