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6. (a) Justify each of the following statements:

(i) It is advisable to use an evaporating dish instead of a conical flask to evaporate a solution.

(ii) In the filtration process, the filtrate passes through the filter paper while the residue does not.

(iii) Melting of ice is regarded as a physical change.

(iv) Rusting of iron is regarded as a chemical change.

(v) Carbon is a non-metal.



Answer :

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Final answer:

In chemistry, classify changes as physical or chemical based on the given examples.


Explanation:

Physical or Chemical changes:

  1. Physical: A mirror breaking is a physical change.
  2. Chemical: An iron nail corroding in moist air is a chemical change.
  3. Physical: Copper metal melting is a physical change.
  4. Chemical: A catalytic converter changing nitrogen dioxide to nitrogen gas and oxygen gas is a chemical change.

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