Use the information below to answer the following questions. An iron nail (Fe) is placed into a solution of copper sulfate (CuSO4). After some time, the blue color of the copper sulfate disappears and some copper-colored solid (Cu) is found on the surface of the nail. The solution now contains iron sulfate (FeSO4), and the container feels warmer than before the reaction. (Use ^ for the subscripts)

List the reactants (use the chemical symbols).
List the products (use the chemical symbols).
Identify the solvent.
Is this reactions exothermic or endothermic?
Is the blue color disappearing a sign of a physical or chemical change?