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Changes Around Us: Physical and Chemical

CBSE · Class 7 · Science

Complete topic list for Changes Around Us: Physical and Chemical in CBSE Class 7 Science. Key concepts, sub-topics, and what to focus on for board exams.

42 questions21 flashcards5 concepts

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4 Topics · CBSE Class 7 Science

Topics in Changes Around Us: Physical and Chemical

1

Types of Changes

  • Changes can be observed through our five senses - sight, smell, touch, hearing, and taste
  • All changes involve alteration in size, shape, smell, or other properties of substances
  • Changes are classified into two main types: Physical Changes and Chemical Changes
2

Physical Changes - Detailed Study

  • Examples: Folding paper, inflating balloon, crushing chalk, melting ice, boiling water
  • The original substance remains the same, only appearance changes
  • State changes (melting, freezing, evaporation, condensation) are physical changes
3

Chemical Changes - Detailed Study

  • New substances are formed with different properties
  • Examples: Rusting of iron, burning of magnesium, curdling of milk, cooking food
  • Usually irreversible changes
4

Combustion - Special Type of Chemical Change

  • Chemical reaction where substance reacts with oxygen producing heat and/or light
  • Three requirements for combustion: Fuel (combustible substance), Oxygen, Heat (ignition temperature)
  • Examples of combustible substances: wood, paper, cotton, kerosene, wax

Key Concepts

A change in which onlyA change in which oneA chemical reaction where a substanceThe minimum temperature at whichReversible changes can be undone

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?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision 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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