Q1
What is a physical change?
AA change in form without changing composition
BA change creating a new substance
CNo change at all
DOnly a colour change
ICSEClass 7 (ICSE)ScienceCh 9 · Topic 1
Physical and Chemical Changes
A physical change alters a substance's form without changing its composition, while a chemical change forms a new substance with different p
Core concept
Physical changes, like melting, freezing, or cutting, change appearance or state but don't alter the substance's chemical makeup.
How it works
Chemical changes, like burning, rusting, or cooking, create entirely new substances with different chemical properties.
Why it matters
Signs of chemical change include colour change, gas production, temperature change, precipitate formation, or a permanent change.
Key detail
Distinguishing between physical and chemical changes helps us understand and predict how substances behave and interact.
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Quick notes
• Physical changes alter form, not chemical makeup.
• Examples: melting, freezing, cutting.
• Chemical changes create new substances.
• Examples: burning, rusting, cooking.
• Signs include colour change and gas production.
• Temperature change can indicate chemical change.
• Precipitate formation is another sign.
• Distinguishing changes helps predict behaviour.