Changes Around Us | Class 7 Science Notes
By ConceptScroll Team · Published on 17 July 2026 · 2 min read
Changes Around Us – this guide gives you a concise, exam-ready overview of Changes Around Us from Class 7 Science, written by ConceptScroll editors and reviewed against the latest NCERT textbook.
Physical Changes
Physical changes are changes in which the form or appearance of a substance changes, but its chemical composition remains the same. These changes are usually reversible. Examples include changes of state such as melting, freezing, evaporation, condensation, and sublimation. When ice melts to water, the water molecules remain the same; only their arrangement changes. Similarly, water boiling to steam is a physical change where water changes from liquid to gas. Physical changes also include breaking, tearing, or crushing of materials, where the substance remains chemically unchanged. These changes can be reversed by applying suitable methods, such as cooling melted wax to solidify it again. Physical changes do not involve energy changes that alter the chemical bonds of substances. Understanding physical changes helps in recognizing that matter can change its state or shape without changing its identity.
📊 Diagram: Diagrams show the melting of ice to water, evaporation of water from a surface, and condensation of steam into water droplets, illustrating physical changes of state.
🧪 Activity: Activity: Heating ice cubes and observing the change from solid to liquid, then cooling water to observe freezing.
🔗 Connection: This section leads to the next, which discusses chemical changes and how they differ from physical changes.
Frequently asked questions
Which of the following is an example of a physical change?
Melting of ice
What is a chemical change? Give one example from daily life.
A chemical change is a change in which one or more new substances with different properties are formed. For example, burning of wood is a chemical change because it produces ash, carbon dioxide, and water vapor which are different from wood.
Which of the following changes is irreversible?
Burning of paper
Explain why melting of ice is considered a physical change.
Melting of ice is a physical change because it involves a change in state from solid to liquid without changing the chemical composition of water. The water molecules remain the same, only their arrangement changes.
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