Chapter 02 Is Matter Around Us Pure? Questions-03
Questions
1. Classify the following as chemical or physical changes:
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cutting of trees,
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melting of butter in a pan,
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rusting of almirah,
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boiling of water to form steam,
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passing of electric current, through water and the water breaking down into hydrogen and oxygen gases,
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dissolving common salt inwater,
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making a fruit salad with raw fruits, and
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burning of paper and wood.
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Answer
Physical Change :
Cutting of trees
Melting of butter in a pan
Boiling of water to form steam
Dissolving common salt in water
Making a fruit salad with raw fruits
Chemical Change :
Rusting of almirah.
Passing of electric current, through water and the water breaking down into hydrogen and oxygen gases.
Burning of paper and wood.
2. Try segregating the things around you as pure substances or mixtures.
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Answer
(a) Mixture
(b) Mixture
(c) Mixture
(d) Pure substance
(e) Pure substance
(f) Compound/mixture
(g) Mixture
(h) Pure substance
