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.
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Topics in Changes Around Us: Physical and Chemical
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. 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. 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. 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.
Key Concepts
Central concept: Changes Around Us
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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