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Revision Notes

Changes Around Us: Physical and Chemical

CBSE · Class 7 · Science

Quick revision notes for Changes Around Us: Physical and Chemical — CBSE Class 7 Science. Key concepts, formulas, and definitions for last-minute revision.

42 questions60 flashcards5 concepts

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Key Topics to Revise

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.

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Full Notes

Key Concepts

A physical change is a changeA chemical change is a changeWhen carbon dioxide is passed throughCombustion is a chemical reactionIgnition temperature is the lowest temperature

Frequently Asked Questions

What are the important topics in Changes Around Us: Physical and Chemical for CBSE Class 7 Science?
Changes Around Us: Physical and Chemical covers several key topics that are frequently asked in CBSE Class 7 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Changes Around Us: Physical and Chemical — CBSE Class 7 Science?
Understand the core concepts first, then work through the 42 practice questions available for this chapter. Revise formulas and 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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