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CBSE Notes
Class 7
Science
Chapter 5 Changes around us: physical and chemical

CBSE Notes Class 7 Science Chapter 5 Changes Around Us: Physical and Chemical

In our daily life, we observe many changes happening around us. Some changes are temporary, while others are permanent. This chapter helps students understand the difference between physical and chemical changes and how they affect substances.

A physical change is a change in which no new substance is formed. These changes are usually reversible, which means we can get the original substance back. A chemical change, on the other hand, results in the formation of a new substance with different properties. These changes are usually irreversible.

Students learn how to identify these changes based on certain signs such as change in color, formation of gas, release of heat or light, and formation of a new substance. Understanding these changes helps students relate science to everyday life. It also develops their ability to observe carefully and think logically.

1.0Download CBSE Class 7 Science Chapter 5 Notes: Free PDF
 

Download the PDF of the CBSE Class 7 Science Chapter 5—Changes Around Us: Physical and Chemical Notes to learn more about the different kinds of changes. These notes explain important ideas in simple terms and give real-life examples. Great for quickly going over important subjects.

Changes Around Us: Physical and Chemical

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2.0Key Features of Chapter 5: Changes Around Us: Physical and Chemical

  • Types of Changes: Distinguishes between physical changes (no new substance created) and chemical changes (new substance created).
  • Reversible and Irreversible Changes: This section talks about which changes can be undone and which can't.
  • Signs of a chemical change include a change in colour, the formation of gas, and the release of heat.
  • Everyday Examples: Ties ideas to cooking, burning, rusting, and digestion.
  • Conservation of Matter: This explains how matter stays the same even when things change.
  • Changes are important because they are a part of natural processes and human activities. 

Frequently Asked Questions

A change in the physical properties (shape, size, state) of a substance where no new substance is formed.

A change in which one or more new substances with different chemical properties are formed.

The process of depositing a layer of zinc on iron to protect it from rusting.

It is a method to obtain pure crystals of a substance from its solution without changing the chemical identity of the substance.

Signs include the evolution of gas, change in color, production of heat or light, and formation of a precipitate.

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CBSE Chapter-wise Notes for Class 7 Science

Class 7 Science Chapter 1 - The Ever-Evolving World of Science Notes

Class 7 Science Chapter 2 - Exploring Substances – Acidic, Basic and Neutral Notes

Class 7 Science Chapter 3 - Electricity: Circuits and Components Notes

Class 7 Science Chapter 4 - The World of Metals and Non-Metals Notes

Class 7 Science Chapter 5 - Changes Around Us: Physical and Chemical Notes

Class 7 Science Chapter 6 - Adolescence: A Stage of Growth and Change Notes

Class 7 Science Chapter 7 - Heat Transfer in Nature Notes

Class 7 Science Chapter 8 - Measurement of Time and Motion Notes

Class 7 Science Chapter 9 - Life Processes in Animals Notes

Class 7 Science Chapter 10 - Life Processes in Plants Notes

Class 7 Science Chapter 11 - Light: Shadows and Reflection Notes

Class 7 Science Chapter 12 - Earth, Moon and the Sun Notes


NCERT Solutions for Class 7 Science : All Chapters

Chapter 1 : The Ever-evolving World of Science

Chapter 2 : Exploring Substances - acidic, basic and neutral

Chapter 3 : Electricity: Circuits and Components

Chapter 4 : The World of Metals and Non-Metals

Chapter 5 : Changes Around Us: Physical and Chemical

Chapter 6 : Adolescence: A Stage of Growth and Change

Chapter 7 : Heat Transfer in Nature

Chapter 8 : Measurement of Time and Motion

Chapter 9 : Life Processes in Animals

Chapter 10 : Life Processes in Plants

Chapter 11 : Light: Shadows and Reflection

Chapter 12 : Earth, Moon and the Sun