CBSE Class 7 Changes Around Us Notes 2026-27 | Free PDF

Discover Class 7 science changes around us with this quick guide. Learn about physical and chemical changes, reversible and irreversible changes, and everyday examples in one place. These notes help students revise faster, understand the chapter better, and prepare confidently for school exams. This chapter becomes easier when students stop seeing change as just “something happening” and start noticing what kind of change it is. Some changes only affect shape, size, or state, while others form a new substance. That is why Class 7 science changes around us notes are useful. They bring the chapter into one clear flow and make revision less confusing before tests and exams.

Nikita Aggarwal26 Sept, 2026

What is Changes Around Us Class 7?

Changes Around Us Class 7 explains the different changes we observe in substances and objects in everyday life. The chapter focuses mainly on physical and chemical changes, along with examples of reversible and irreversible changes.

These Class 7 Science Changes Around Us notes help students understand the difference between these types of changes and revise important examples such as melting, rusting, burning and curd formation

Download Class 7 Science Changes Around Us Notes PDF

A Class 7 science changes around us notes PDF is useful because it keeps the main definitions, examples, and chapter points together in one place. It is especially helpful before a class test, while doing homework, or during final revision when students want short study material instead of long textbook explanations.

Changes Around Us Physical and Chemical Class 7 Notes

Changes happen around us all the time. Some changes affect only the shape, size or state of a substance, while others result in the formation of a new substance.

Physical Change

A physical change is a change in which the physical properties of a substance, such as its shape, size or state, change without forming a new substance.

Examples:

Melting of ice
Melting of wax
Cutting paper
Folding paper
Dissolving sugar in water

Chemical Change

A chemical change is a change in which one or more new substances are formed.

Examples:

Rusting of iron
Burning of wood
Curd formation from milk
Cooking food
Burning a candle

Physical and Chemical Changes: Difference

Physical Change	Chemical Change
No new substance is formed	A new substance is formed
Physical properties may change	Chemical composition changes
Example: melting ice	Example: rusting iron
Often easier to reverse	Usually difficult to reverse

Reversible and Irreversible Changes

Changes can also be described according to whether the original state can be obtained again.

Reversible Change

A reversible change is a change that can be reversed under suitable conditions so that the original state can be obtained again.

Examples:

Melting and freezing of ice
Stretching a rubber band
Folding a piece of paper

Irreversible Change

An irreversible change is a change that cannot easily be changed back to its original state.

Examples:

Burning paper
Cooking food
Rusting of iron
Curd formation from milk

A physical change can sometimes be reversible or irreversible. Similarly, chemical changes are generally difficult to reverse because new substances are formed. Therefore, physical/chemical and reversible/irreversible describe changes from two different perspectives.

Changes Around Us Class 7 Examples

The following examples make the classifications easier to remember:

Change	Type	Why?
Melting of ice	Physical	No new substance is formed
Freezing of water	Physical	The state changes from liquid to solid
Cutting paper	Physical	Only size and shape change
Rusting of iron	Chemical	A new substance, rust, forms
Burning wood	Chemical	New substances are produced
Curd formation	Chemical	Milk changes into curd with new properties
Stretching a rubber band	Physical	Its shape changes
Cooking food	Chemical	New substances are formed

Class 7 Science Changes Around Us Notes: Important Points

Changes take place continuously around us.
A physical change does not result in the formation of a new substance.
A chemical change results in the formation of one or more new substances.
Melting, freezing and cutting are examples of physical changes.
Rusting, burning and curd formation are examples of chemical changes.
A reversible change can be undone under suitable conditions.
An irreversible change cannot easily be changed back to its original state.
Physical and chemical changes should not be confused with reversible and irreversible changes.
Observing the properties of a substance before and after a change helps us understand what has happened.

Physical and Chemical Changes Class 7 Handwritten Notes: Quick Revision

For quick revision, students can remember the chapter using these two questions:

1. Is a new substance formed?
If no new substance is formed, the change is generally a physical change. If a new substance is formed, it is a chemical change.

2. Can the change be reversed?
If the original state can be obtained again under suitable conditions, it is a reversible change. If it cannot easily be reversed, it is an irreversible change.

This simple approach helps students classify common examples without memorising every example separately.