Chap 6 Electrochemistry
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Chapter 6

Electrochemistry

[16 periods]

 

Electrolysis

bulletFamiliarize yourself  with the terms electrolytes, non electrolytes, electrolysis, anode* and cathode**[p97-98, TB].

 

bulletLearn the description for the electrolysis of molten Lead(II) Bromide[p98,TB] and aqueous copper(II) sulphate[p100-101,TB][p61,p70 PB].

 

bulletThere are three factors that influence the formation of products if electrolysis[p100,TB][Exp.6.2 p65; Exp 6.3 p67-69, PB].

 

bulletThe factor “type of electrodes”is the concept used in purification of metals [p102 TB] and electroplating of metals[p103, Tb].

 

bulletAll half equations must be written with the plus sign before the electrons, e, example
bullet 
M+ + e   ----> M  and     X- ------->  X + e

 

      Chemical cell

bulletVoltaic cells use two different types of metal electrodes.

 

bulletTerms such as voltaic cell, galvanic cell and chemical cell are used interchangeably.

 

bulletWhereas Daniel cell is specifically for chemical cell with the copper and zinc electrodes.

 

bullet[Figure 6.7, p105 TB] show the position of metals in the order of increasing electropositivity. When any two metals are connected, electrons flow from the more electropositive metal to less electropositive metal, through an external circuit.

 

bulletThe terminals are determined from the direction of the flow of electrons. [Exp 6.7,6.8,p76-79, PB] are to determine the position of metals in the electrochemical series.

 

bullet*,** The terms anode being positive and cathode being negative are not their correct definitions. Anode is defined as the electrode where the oxidation process takes place whereas cathode being the electrode where the reduction process takes place.

 

bulletOxidation and Reduction will be taught in Form 5.

 

bulletPlease take note of the terminals of the electrode in electrolysis and voltaic cells

 

 

Electrolysis

Voltaic Cell

Anode

+

-

Cathode

-

+

 

If you have any problems, email to the address below. State your name and class so that your chemistry teacher can guide you to solve your problem.

tjpereira@smkrajaperempuanipoh.com