Iwill give brainiest answer to whoever me, also this problem is worth 20 points

an iron nail (fe) is placed into a solution of copper (ii) sulfate (cuso4). after some time, the blue color of the copper (ii) sulpate disappears and some copper-colored solid (cu) is pound on the surface of the nail. the solution now contains iron (ii) sulfate (feso4), and the container feels warmer than before the reaction.

does this reaction absorb or release energy? how do you know?

what do the color changes in the reaction above indicate?