Perform the following reactions and classifying 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.

A. when an iron nail is dipped in copper sulphate, a brown coating of copper is formed on the surface of the iron and the colour of copper sulphate solution changes from blue to light green. this reaction shows that iron is more reactive than copper as it displaces copper from its solution and iron passes into solution as Fe{||} ions and ferrous sulphate solution is formed. its a physical change as it would not change into a completely new substance with new properties.

Explanation:

the atomic mass is the bottom number on the element.

-steel jelly

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.