CHM 2046C Sample Module 14 Name: ___Answers_____

Part I: Batteries, Fuel Cell, Electrolysis 10 points

Dry Cell Battery

Match the following:

_B__1. Cathode

_A__2. Anode

_J__3. Zinc Can

_G__4. Carbon Rod

_ I__5. Porous Separator

_E__6. Wax seal

_D__7. Steel Cover

_F__8. Sand Cushion

_H__9. NH₄Cl, ZnCl₂, MnO₂ paste

_C__10. Insulating Washer

Reaction at Anode: ____Zn ---> Zn²⁺ + 2 e^1-________

Reaction at Cathode: _2 NH₄^{1+ +} 2 e^1- ---> 2 NH₃ + H₂____

Mercury Cell

__G___11. Cathode

__E___12. Anode

__A___13. Outer Steel

__B___14. Steel Cover

__C___15. Tin-Plated Inner Top

__D___16. Sealing and Insulated Gasket

__E___17. Zn (anode)

__F___18. KOH saturated with ZnO in absorbent Material

(electrolyte)

__G___19. HgO mixed with Graphite

__I___20. Barrier

Reaction at Anode: Zn(s) + 2 OH^1-(aq) ---> ZnO(s) + H₂O (l) + 2 e^1-

Reaction at Cathode: HgO(s) + H₂O(l) + 2e^1----> Hg(l) + 2 OH^1-(aq)

Lead Storage Battery

Reaction at Anode: Pb(s) + SO₄^2-(aq) ---> PbSO₄(s) + 2 e^1-

Reaction at Cathode: PbO₂(s) + 4 H¹⁺⁽aq) + SO₄^2-(aq) + 2e^1----> PbSO₄(s) + 2 H₂O (l)

Alkaline Battery :

Reaction at Anode: Zn(s) + 2 OH^1-(aq) ---> ZnO(s) + H₂O (l) + 2 e^1-

Reaction at Cathode: 2 MnO₂(s) + H₂O(l) + 2e^1----> Mn₂O₃(s) + 2 OH^1-(aq)

Fuel Cell:

Reaction at Anode: H₂(g) ---> + 2 H¹⁺(aq) + 2 e^1-

Reaction at Cathode: O₂(g) + 2 H₂O(l) + 4e^1----> 4 OH^1-(aq)