Solution:
When 2 drops of sulphuric acid are added to 1g of copper sulphate powder and dissolved in a small amount of hot water, beautiful crystals are formed. It is a physical change.Amorphous copper sulphate changes into a crystalline form which is a physical change. Changes that do not involve chemical reactions are known as physical changes. The real identity of the substance does not change in chemical change—the real identity of the substance changes. In biochemical change, many biological catalysts like enzymes are involved.
