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Changes Around Us: Physical and Chemical — Syllabus

CBSE · Class 7 · Science

What Changes Around Us: Physical and Chemical covers in CBSE Class 7 Science: 4 topics, for the 2026-27 session. Part of the CBSE Class 7 Science syllabus.

42 questions60 flashcards5 concepts

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4 Topics · CBSE Class 7 Science · 2026-27

Topics in Changes Around Us: Physical and Chemical

1

1. Types of Changes

  • A physical change affects only shape, size, or state.
  • No new substance is formed in a physical change.
  • A chemical change forms one or more new substances.
2

2. Examples of Physical and Chemical Changes

  • Melting ice cubes is a physical change.
  • Chopping vegetables is a physical change.
  • Boiling water is a physical change.
3

3. Chemical Change Indicators

  • Formation of a new substance shows a chemical change.
  • Lime water turns milky when carbon dioxide is passed through it.
  • Bubbling and fizzing may indicate a gas is being formed.
4

4. Combustion and Fire Triangle

  • Combustion needs fuel, oxygen, and heat.
  • Oxygen is the part of air that supports combustion.
  • A candle covered with a glass tumbler stops burning after some time because air is not supplied continuously.

Key Concepts

Central concept: Changes Around Us

Physical ChangesChemical ChangesCombustionReversible and Irreversible ChangesDesirable and Undesirable ChangesWeathering of RocksErosionMichael Faraday

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Frequently Asked Questions

What are the important topics in Changes Around Us: Physical and Chemical for CBSE Class 7 Science?
Key topics in Changes Around Us: Physical and Chemical include Types of Changes, Examples of Physical and Chemical Changes, Chemical Change Indicators, Combustion and Fire Triangle. Study these first, then practise questions on each for Class 7 exams.
How should I revise Changes Around Us: Physical and Chemical for Class 7 exams?
Learn the core ideas first, then work through the 42 practice questions on Changes Around Us: Physical and Chemical. 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.

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