Answer:
Rusting
I guess
Explanation:
Cause in iron if a brown coating appears it is called rusting
If your findings disproves your hypothesis then your hypothesis is probably wrong.
It's not chemical because it would have to react to something to change so it is physical change because it is the same thing but it just smells I hope this helped
<h3>Sulfate takes two Copper atoms and gains negative valence charge,whereas the Copper gains a positive valence charge.The Sulfate is bonded in covalent bonds of polarity, Oxygen having the higher electronegativity, and therefore pulling the electrons closer to it's nucleus than to Sulfur's nucleus.</h3>
