2. MS FARZANA MEHBOOB D.A.NEELUM HIGH SCHOOL
Instructional Lesson on
ELECTROCHEMISTRY
MS FARZANA MEHBOOB D.A.NEELUM HIGH SCHOOL

3. Overview Electrochemistry introduction Cell &Batteries
Electrolysis & its Application

4. ELECTROCHEMISTRY
FARADAY
DANIELL F O U N D E R S
From Wikipedia

5. ELECTRON TRANSFER REACTIONS
ELECTROCHEMISTRY
ELECTRON TRANSFER REACTIONS
ELECTRIC CURRENT
is a
Branch of Chemistry
involves
also
called
Redox reactions
generate
cause OR

6. Electrochemical reactions
CONCEPT MAP
REDOX REACTIONS
Redox reactions
Electrochemical reactions
Spontaneous
Galvanic cells
Batteries
Non spontaneous
Electrolytic cells

7. The loss of electrons is called oxidation,
A redox reaction can be divided into two Half Reactions:
an oxidation reaction
a reduction reaction.
The loss of electrons is called oxidation,
The gain of electrons is reduction.
REDUCING OXIDIZING
AGENT AGENT

8. OIL, Oxidation Is Loss, RIG, Reduction Is Gain
This can be easily remembered through:
OIL,
Oxidation Is Loss,
RIG,
Reduction Is Gain
“ An OIL RIG"

9. Oxidation-Reduction Reactions
OXIDATION = loss of electrons
Examples:
Examples:
Na  Na+ + e-
Al  Al3+ + 3e-
S2-  S + 2e-
Na  Na+ + e-
Al  Al3+ + 3e-
S2-  S + 2e-
OXIDATION = increasing the oxidation number
(more positive)
Example:
NO  NO2
Oxid. Nos: +2 -2 +4 -2
change = +2
+2 to +4 : N is oxidized

10. OXIDATION-REDUCTION REACTIONS
Direct Redox Reaction
Oxidizing and reducing agents in direct contact.
Cu(s) Ag+(aq) ---> Cu2+(aq) + 2 Ag(s)

11. OXIDATION-REDUCTION REACTIONS
Indirect Redox Reaction A battery Oxidizing and reducing agents are not in direct contact

12. Why do reduction-oxidation reactions occur?
It is all about energy. 
Reduction and = an analogous flow oxidation of electrons.
The energy of a chemical system drives the charges to move. E

13. CONCEPT MAP OF GALVANIC CELL
Galvanic cells
Electrochemical cells
Chemical energy
Electrical energy
Daniell cell
Redox reaction take place
Voltaic cells
1.1 voltage
used to convert
into
are
in simplest form
in which
has
also called

14. Parts of a Galvanic cell
Two electrodes of different metals
Electrolyte
An electrical
wire
A salt bridge

15. Cathode compartment The compartment in which reduction occurs.
The reaction at the cathode:
Cu2+ (aq)  +  2e- --->  Cu (s)
Cathode electrode Cu
Electrolyte (CuSO4)

16. Anode compartment The compartment in which oxidation occurs
anode electrode Zn
Electrolyte (ZnSO4)
The compartment in which
oxidation occurs 
The reaction at the anode :
Zn (s)  --->Zn2+ (aq)  +  2e-

17. Story of An Ox & Red Cat

18. Story of An Ox Red Cat AND ANODE NEGATIVE DANIEL ANode OXidation
REDuction CAThode

19. electricity Break apart Electrolysis Electro lysis
WHAT IS ELECTROLYSIS
Electrolysis
Latin word
Electro
electricity
and
lysis
Break apart
through

20. TYPES OF ELECTROLYTE

21. GENERAL TERMS USED IN ELECTROLYSIS
Electrolytic cell
It has three component parts:
An electrolyte
Two electrodes (a cathode and an anode).
A battery

22. VIDEO OF ELECTROLYSIS

23. PREPARATION OF ALKALI & CHLORINE GAS
ELECTROPLATING
EXTRACTION OF METALS
ANODIZING
ELCTROREFINING
PREPARATION OF ALKALI & CHLORINE GAS
Industrial
Application of electrolysis

24. Electrolysis of molten Alumina

25. VIDEO

26. Gold plating cathode: Au+(aq) +e-→Au anode: Au→Au+(aq) +e-
external power source
external power source Au Au
Au+(aq)
Au+(aq)
cathode:
Au+(aq) +e-→Au
anode:
Au→Au+(aq) +e-

27. VIDEO
COPPER REFINING

28. 30/09/99
SUMMARY

29. Concept Map

30. 30/09/99
The End

31. PRESENTER MS FARZANA MEHBOOB
D.A.Neelum High School