Q1
What is a physical change?
AA change without new substances forming
BA change creating new substances
CNo change at all
DOnly a size change
ICSEClass 8 (ICSE)ScienceCh 10 · Topic 1
Physical and Chemical Changes
Physical changes alter appearance without forming new substances, while chemical changes create new substances with different properties.
Core concept
Physical changes, like dissolving sugar in water or cutting paper, don't create new substances and are often reversible.
How it works
Chemical changes, like burning, rusting, or fermentation, form new substances with different properties and are usually irreversible.
Why it matters
Signs of chemical change include gas formation, colour change, precipitate formation, temperature change, and the production of light or sound.
Key detail
Distinguishing physical from chemical changes is fundamental to understanding chemical reactions and predicting substance behaviour.
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• Physical changes don't create new substances.
• Examples: dissolving sugar, cutting paper.
• Physical changes are often reversible.
• Chemical changes create new substances.
• Examples: burning, rusting, fermentation.
• Chemical changes are usually irreversible.
• Signs include gas formation and colour change.
• Distinguishing these is fundamental to chemistry.