7. For the following reactions, indicate the oxidation and reduction reactions and the electrode at which the reaction occurs. a. Ni+ (aq) + Mg (s) Ni (s) + Mg2+ (aq) b. Pb (s) + 2 Ag+ (aq) Pb+ (aq) + 2 Ag (s) 8. Sketch a galvanic cell for the following reaction. a. Label the anode and cathode. b. Write the half-reaction that occurs at each electrode and the species present in each compartment. Indicate the direction of flow of electrons. c. Calculate Ecell and indicate whether the reaction is spontaneous or not. Zn+ (aq) + Ni (s) Zn (s) + Ni+ (aq) 9. A piece of Ag is dipped in Cr (NO)); solution. Based on Eell indicate whether AgNO, will be formed or not? Show equations for the oxidation and reduction reactions. 10. Zinc is more active than cobalt and iron but less active than aluminum. Cobalt is more active than nickel but less active than iron. List the elements in order of increasing activity. 11. What reactions will take place if MgCl2 solution is put in a copper vessel? a. Write the half-cell reactions at each electrode for the cell Cu (s)| Cu+ (aq) ||Mg+|Mg (s). b. Calculate Ecell. Is the cell reaction spontaneous? Will copper dissolve in MgCl? 140