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Chemistry CBSE Live product
Class 7 (2025-26)
Changes around us: Physical and chemical changes
Revision III - Physical and chemical changes
6.
Type of changes
Question:
2
m.
Answer the following questions briefly:
Help Banu to identify the given change as a physical or chemical change. Justify the answer with a reason.
The lighting of firecracker
i. Type of change:
Chemical reaction
Dissolution
Physical change
Melting
ii. Reason:
Firecrackers undergo a temporary change by releasing heat and light
Firecrackers only undergo a physical change
No change in composition and no energy is released
Firecracker burns to form new substances along with heat and light
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