Chapter 5 of 5
Syllabus
Physical and Chemical Changes — Syllabus
Gujarat Board · Class 7 · Science
What Physical and Chemical Changes covers in Gujarat Board Class 7 Science: 4 topics, for the 2026-27 session.
42 questions5 concepts
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4 Topics · Gujarat Board Class 7 Science · 2026-27
Topics in Physical and Chemical Changes
1
Physical Changes
- A physical change is a change in which only the physical properties of a substance change — such as shape, size, colour, or state.
- No new substance is formed in a physical change.
- Physical changes are generally reversible — the original substance can usually be recovered.
2
Chemical Changes
- A chemical change is a change in which one or more new substances are formed.
- A chemical change is also called a chemical reaction.
- Chemical changes are generally irreversible — the original substance cannot be easily recovered.
3
Rusting of Iron and Its Prevention
- Rusting is a chemical change in which iron reacts with oxygen and water to form rust (iron oxide, Fe₂O₃).
- Both oxygen and water (or moisture) are essential for rusting. If either is absent, rusting does not occur.
- High humidity (moisture in air) makes rusting faster.
4
Crystallisation
- Crystallisation is the process of forming large, pure crystals of a substance from its solution.
- It is a physical change because no new substance is formed — only the physical form changes.
- Salt obtained from evaporation of sea water is not pure, but crystallisation gives pure, large, well-shaped crystals.
Key Concepts
A physical change is a changeA chemical change is a changePhysical properties are characteristics ofChemical changes are often accompanied byRusting is a chemical change
Work through every topic in Physical and Chemical Changes with notes and quizzes
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What are the important topics in Physical and Chemical Changes for Gujarat Board Class 7 Science?
Key topics in Physical and Chemical Changes include Physical Changes, Chemical Changes, Rusting of Iron and Its Prevention, Crystallisation. 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 42 practice questions on Physical and Chemical Changes. Revise definitions regularly and use flashcards for quick recall before the exam.
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Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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