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Chemistry CBSE Live product
Class 7 (2025-26)
Changes around us: Physical and chemical changes
Revision II - Physical and chemical changes
6.
Changes
Question:
3
m.
Answer the following:
Observe the picture containing a kettle it has salt water in it.
i.
Name two reversible changes shown in the image.
Cooking and evaportion
Burning and condensation
Evaporation and condensation
Evaporation and burning
ii.
Is the evaporation of water from salt water a physical or chemical change? Give reasons.
It is a chemical change, only the state of water changes from liquid to vapour
It is a physical change, the change is irreversible
It is a physical change, there is a formation of a new substance
It is a physical change, only the state of water changes from liquid to vapour
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