If you put a piece of iron in an aqueous solution of blue Cu²⁺ ions, the spontaneous redox reaction 

Fe + Cu²⁺ → Fe²⁺ + Cu will occur. 

An aqueous solution of Fe²⁺ ions is red-brown.

(a) What is oxidized?

(b) What is reduced?

(c) What is the oxidizing agent?

(d) What is the reducing agent?

(e) What will happen to the piece of iron over time?

(f) Do the electrons move from the oxidizing agent to the reducing agent or from the reducing agent to the oxidizing agent?

(g) How could you use this reaction to make a battery? (Explain and show your battery in a diagram, using a nail and a penny as your source of iron and copper, respectively.)