Changes Around Us: Physical and Chemical — Chapter Summary
CBSE · Class 7 · Science
Summary of Changes Around Us: Physical and Chemical for CBSE Class 7 Science. Part of the CBSE Class 7 Science syllabus.
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Overview
Changes happen all around us in everyday life. Some changes alter only the shape, size, or state of a substance, while others form new substances with different properties. Understanding these two types of changes helps in identifying what is reversible, what is irreversible, and how different proce
Key Concepts
A physical change is a change
A physical change is a change in shape, size, or state in which no new substance is formed. Examples include melting ice cubes, folding paper, inflati
A chemical change is a change
A chemical change is a change in which one or more new substances are formed through a chemical reaction. Examples include rusting, burning magnesium
When carbon dioxide is passed through
When carbon dioxide is passed through lime water, the lime water turns milky or cloudy because calcium carbonate is formed. This reaction is used as a
Combustion is a chemical reaction
Combustion is a chemical reaction in which a substance reacts with oxygen and produces heat and/or light. Wood, paper, cotton, and kerosene are combus
Ignition temperature is the lowest temperature
Ignition temperature is the lowest temperature at which a substance catches fire. Oxygen alone is not enough for burning; heat must raise the fuel to
Learning Objectives
- Identify physical changes and chemical changes
- Explain that physical changes do not form a new substance
- Explain that chemical changes form one or more new substances
- Recognise combustion, rusting, and lime water test as examples of chemical change
- Understand ignition temperature and the three requirements for combustion
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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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