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Class 7
Chapter 5 Class 7 - Changes Around Us: Physical and Chemical (Curiosit
Concepts

Concepts

Introduction

What are Physical Changes?

What are Chemical Changes?

How Do We Identify These Changes?

Are All Changes Around Us Obvious?

What Tools Help Us Study Changes?

5.1 A Substance May Change in Appearance but Remain the Same!

Activity: Observing Changes Around Us

Understanding Physical Changes Through Hands-on Activities

5.2 A Substance May Change in Appearance and Not Remain the Same!

Identifying Chemical Changes Through Lime Water Test

Chemical Reactions with Everyday Materials

5.3 Some Other Processes Involving Chemical Changes

5.3.1 Rusting

5.3.2 Combustion

5.4 Can Physical and Chemical Changes Occur in the Same Process?

Analyzing the Burning Candle Process

5.5 Are Changes Permanent?

Classifying Changes as Reversible or Irreversible

5.6 Are All Changes Desirable?

Identifying Desirable and Undesirable Changes

5.7 Some Slow Natural Changes

5.7.1 Weathering of Rocks

5.7.2 Erosion

Summary

Chapter at a Glance

You are here

Questions at the end of the chapter →

Class 7

Chapter 5 Class 7 - Changes Around Us: Physical and Chemical (Curiosit

Concepts
Questions at the end of the chapter

Chapter at a Glance

Last updated at April 25, 2026 by Teachoo

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Class 7
Chapter 5 Class 7 - Changes Around Us: Physical and Chemical (Curiosit

Concepts

Introduction

What are Physical Changes?

What are Chemical Changes?

How Do We Identify These Changes?

Are All Changes Around Us Obvious?

What Tools Help Us Study Changes?

5.1 A Substance May Change in Appearance but Remain the Same!

Activity: Observing Changes Around Us

Understanding Physical Changes Through Hands-on Activities

5.2 A Substance May Change in Appearance and Not Remain the Same!

Identifying Chemical Changes Through Lime Water Test

Chemical Reactions with Everyday Materials

5.3 Some Other Processes Involving Chemical Changes

5.3.1 Rusting

5.3.2 Combustion

5.4 Can Physical and Chemical Changes Occur in the Same Process?

Analyzing the Burning Candle Process

5.5 Are Changes Permanent?

Classifying Changes as Reversible or Irreversible

5.6 Are All Changes Desirable?

Identifying Desirable and Undesirable Changes

5.7 Some Slow Natural Changes

5.7.1 Weathering of Rocks

5.7.2 Erosion

Summary

Chapter at a Glance

You are here

Questions at the end of the chapter →

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CA Maninder Singh

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