Question 78
Bibi carefully measures the mass of an iron nail and records that it is 12.6 g. She then puts the nail into a beaker of copper sulfate solution that has a mass of 274.3 g. After a week, the nail turns reddish. When it has dried, Bibi measures its mass again and finds that it is 13.3 g.
Is the change in the nail physical or chemical? How do you know?
Is the change in the nail physical or chemical? How do you know?
