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Physical and Chemical Changes — Chapter Summary

ICSE · Class 7 · Chemistry

Summary of Physical and Chemical Changes for ICSE Class 7 Chemistry. Part of the ICSE Class 7 Chemistry syllabus.

45 questions30 flashcards5 formulas & key relations5 concepts

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A flowchart illustrating the processes by which matter changes from one state to another (solid, liquid, gas) and the conditions (temperature, pressure) that facilitate these changes.
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Overview

Matter changes all around us in different ways. Some changes are temporary and affect only the form, while others are permanent and form new substances with different properties. Changes may happen slowly or quickly, naturally or because of human activity, and they may be desirable or undesirable. T

Key Concepts

A physical change is a temporary

A physical change is a temporary change in which no new substance is formed and the chemical composition remains the same. Only physical properties su

A chemical change is a permanent

A chemical change is a permanent change in which new substance(s) are formed. The new substance has properties that are completely different from the

A reversible change can be changed

A reversible change can be changed back by changing conditions, often by simple methods. An irreversible change cannot be brought back to the original

Evaporation is the slow change

Evaporation is the slow change of a liquid into vapour at any temperature below its boiling point, and it happens only from the surface. Boiling is a

Melting point is the temperature at

Melting point is the temperature at which a solid changes into a liquid. Freezing point is the temperature at which a liquid changes into a solid. For

Learning Objectives

  • Differentiate between physical and chemical changes
  • Recognise reversible and irreversible changes
  • Identify signs of a chemical change such as colour change, gas formation, and energy change
  • Understand evaporation, boiling, melting, freezing, condensation, and sublimation
  • Classify everyday examples like rusting, burning, dissolving, and curd formation

Frequently Asked Questions

What are the important topics in Physical and Chemical Changes for ICSE Class 7 Chemistry?
Key topics in Physical and Chemical Changes include Types of Changes, Physical Changes, Chemical Changes, Important Reactions and Examples. Study these first, then practise questions on each for Class 7 exams.
How should I revise Physical and Chemical Changes for Class 7 exams?
Learn the core ideas first, then work through the 45 practice questions on Physical and Chemical Changes. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for Physical and Chemical Changes

All ICSE Class 7 Chemistry Chapter Summary

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