3. Determine whether each of the following change is physical or
chemical. Give reason for your answer.
(i) A balloon filled with hydrogen gas explodes upon contact with the
spark.
(ii) Copper turns green on exposure to air and water.
(iii) A metal surface becomes dull because of continued abrasion.
Mates plz help
Answers
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Answer: 2 an 3 are chemical change whereas 1 is physical change
Explanation:
The physical properties of the balloon change on exploding in case 1 whereas chemical property of copper changes in case 2 and the chemical property of metal changes in case 3
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