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Physical and Chemical Changes — Revision Notes

ICSE · Class 7 · Chemistry

Physical and Chemical Changes revision notes for ICSE Class 7 Chemistry: 4 topics in quick points. 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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Key Topics to Revise

1

Types of Changes

  • Changes can be classified as slow or fast, natural or man-made, periodic or non-periodic, desirable or undesirable, reversible or irreversible, and physical or chemical.
  • Slow changes take a long time to complete, such as rusting of iron, growth of a plant, or evaporation of water from a lake.
  • Fast changes happen in a short time, such as burning of paper, bursting of a cracker, or lighting of an electric bulb.
2

Physical Changes

  • A physical change is temporary.
  • No new substance is formed in a physical change.
  • Only physical properties like colour, state, shape, size, hardness, or smell may change.
3

Chemical Changes

  • A chemical change is permanent.
  • One or more new substances are formed in a chemical change.
  • The properties of the new substance are different from those of the original substance.
4

Important Reactions and Examples

  • Burning of paper gives ash and smoke; it is a chemical change.
  • Burning of sugar first melts the sugar, then turns it brown and finally black; the black residue is charcoal.
  • Charcoal is a form of carbon, an element.

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Full Notes

Key Concepts

A physical change is a temporaryA chemical change is a permanentA reversible change can be changedEvaporation is the slow changeMelting point is the temperature at

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 Revision Notes

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