SBA # 9 - 22

9) Active metals are more difficult to process and refine than less active metals because they are more readily active then metals.

11) Most metals exist in nature as minerals rather than as pure metallic elements because they are more reactive.

12) a is more likely to occur.

13) b. because zinc is more reactive than silver

14) a) It would be a poor idea to stir a solution of lead (II) nitrate with an iron spoon because iron is more reactive.
     
15) Oxidation- the loss of at least 1 electron that causes a metal to become a cation or an aqueous solution
      Reduction- the gain or loss of electrons (causes a cation or aqueous solution to balance out makeing a metal)

16) a) Au 3- + 3E -> Au
      b) V -> v4+ + 4e- 
      c) Cu -> cu2+ +2E+

17) a) reduction
      b) oxidation
      c) reduction

21) a) electrometallugy uses electricity
      b) pyrometallurgy uses thermal hear
      c) hydrometallurgy uses water

22) a) electrometallurgy
      b) electrometallugy