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Changes Around Us: Physical and Chemical

CBSE · Class 7 · Science

Step-by-step guide to study Changes Around Us: Physical and Chemical in CBSE Class 7 Science. Topics to cover, practice strategy, and time allocation.

42 questions60 flashcards5 concepts

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Study Plan

1
Day 1–2

Learn the Theory

Read the textbook chapter carefully. Note down definitions, formulas, and key concepts.

2
Day 3

Practice Problems

Solve textbook exercises and additional practice questions. There are 42 questions available for this chapter.

3
Day 4

Revise & Test

Revise key formulas and concepts without looking at notes. Take a practice quiz to test your understanding. Mark weak areas for re-revision.

4
Day 7

Spaced Revision

Revisit Changes Around Us: Physical and Chemical after a week. Use flashcards for quick recall. Solve previous year questions from this chapter.

What to Focus On

  • Changes can be seen, smelled, touched, heard, or tasted.
  • Some changes affect only appearance.
  • Some changes produce new substances.

  • No new substance is formed in a physical change.
  • Shape, size, or state may change.
  • Some physical changes can be reversed.

  • New substances are formed in a chemical change.
  • Chemical changes happen through chemical reactions.
  • Gas formation, heat, light, colour change, or deposit formation may be signs.

Common Mistakes to Avoid

Any change in appearance is a physical change.

Rusting is only a surface colour change, so it is a physical change.

Burning a candle is completely a chemical change.

Memory Tips

Physical change definition

Chemical change definition

Lime water test for carbon dioxide

Reaction of lime water with carbon dioxide

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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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