Perform the following reactions and classify them as physical or chemical changes:

1. Iron with copper sulphate solution in water
2. Burning of magnesium ribbon in the air
3. Zinc with dilute sulphuric acid
4. Heating of copper sulphate crystals
5. Sodium sulphate with barium chloride in the form of their solutions in water

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) Perform the following reactions and classify them as physical or chemical changes: a) Iron with copper sulphate solution in water b) Burning of magnesium ribbon in air c) Zinc with dilute sulphuric acid d) Heating of copper sulphate crystals e) Sodium sulphate with barium chloride in the form of their solutions in water