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

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Presentation on theme: "MS FARZANA MEHBOOB D.A.NEELUM HIGH SCHOOL Instructional Lesson on ELECTROCHEMISTRY."— Presentation transcript:

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

3 Overview Electrochemistry introduction Cell &Batteries Electrolysis & its Application

4 ELECTROCHEMISTRY FARADAY From Wikipedia FOUNDERSFOUNDERS DANIELL

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

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

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

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

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

10 OXIDATION-REDUCTION REACTIONS Direct Redox Reaction Oxidizing and reducing agents in direct contact. Cu(s) + 2 Ag + (aq) ---> Cu 2+ (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 Galvanic cells Electrochemical cells Chemical energy Electrical energy Daniell cell Redox reaction take place Voltaic cells1.1 voltage into used to convert in simplest form has CONCEPT MAP OF GALVANIC CELL are also called in which

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: Cu 2+ (aq) + 2e - ---> Cu (s) Cathode electrode Cu Electrolyte (CuSO 4 )

16 Anode compartment The compartment in which oxidation occurs The reaction at the anode : Zn (s) --->Zn 2+ (aq) + 2e - anode electrode Zn Electrolyte (ZnSO 4 )

17 Story of An Ox & Red Cat

18 Story of An Ox Red Cat AND ANode OXidation REDuction CAThode ANODE NEGATIVEDANIEL

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

20 TYPES OF ELECTROLYTE

21 GENERAL TERMS USED IN ELECTROLYSIS Electrolytic cell It has three component parts: 1.An electrolyte 2.Two electrodes (a cathode and an anode). 3.A battery

22 VIDEO OF ELECTROLYSIS

23 ELECTROPLATING EXTRACTION OF METALS ANODIZINGELCTROREFINING PREPARATION OF ALKALI & CHLORINE GAS Industrial Application of electrolysis

24 Electrolysis of molten Alumina

25 VIDEO

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

27 COPPER REFINING VIDEO

28 SUMMARY

29 Concept Map

30 The End

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


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