# NCERT Class 7 Science Chapter 5 Changes Around Us: Physical and Chemical Solutions: In-Text and Exercise Questions Explained | SwaVid

This page provides comprehensive solutions for the in-text and exercise questions from Chapter 5, "Changes Around Us: Physical and Chemical," of the CUR...

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# Changes Around Us: Physical and Chemical

## Find the gaps before this chapter finds them for you.

## Related chapters

Chapter 5 · Class 7 Science

This page provides comprehensive solutions for the in-text and exercise questions from Chapter 5, "Changes Around Us: Physical and Chemical," of the CURRENT NEW NCERT Class 7 Science textbook, "Curiosity." This chapter explores the fundamental differences between physical and chemical changes, their characteristics, and common examples encountered in daily life. It also delves into specific chemical changes like rusting and the process of crystallisation. Understanding these concepts is crucial for building a strong foundation in chemistry.

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Exercise Questions

Answer: (a) Melting of ice: Physical change (only state changes, no new substance formed).
(b) Burning of paper: Chemical change (ash and gases are formed, new substances).
(c) Rusting of iron: Chemical change (iron oxide is formed, a new substance).
(d) Dissolving sugar in water: Physical change (sugar molecules are still present, can be recovered).
(e) Cooking of food: Chemical change (new substances with different properties are formed, irreversible).

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- A physical change is a change in which only the physical properties of a substance change, and no new substance is formed. It is often reversible.
- A chemical change is a change in which new substances are formed with different properties. It is generally irreversible.
- Based on these definitions, we classify each change.
- NCERT Class 7 Science textbook: Curiosity : Chapter 5: Changes Around Us: Physical and Chemical

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