science chemistry homework help please!!?
An iron nail (Fe) is replaced into a solution of copper (II) sulfate (CuSO4) after some time, the color of the copper (II) sulfate disappears and some copper-colored solid (Cu) is found on the surface of the nail. The solution now contains iron(II) sulfate(FeSO4) and the container feels warmer before the reaction. Q 1):does this reaction absorb or release energy? how do you know? . .Q 2): what do the color changes indicate?