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Physics Paper 2, Nov/Dec. 2009  
Questions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Main
General Comments
Weakness/Remedies
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Question 4
Part I:      Candidates were required to answer any five questions from this part.
  1. State:

    1. two applications of electrolysis in an industry;
    2. one application of electrolysis in a school laboratory
_____________________________________________________________________________________________________
Observation

This was one of the popular questions.  The candidates could not state the application of electrolysis in a school laboratory but could state those in industries.  This is an indication of lack of laboratory practices.

The expected answers are:
                                                                                     
(a)    In industry we use electrolysis for;
(i)     electroplating;
(ii)    extraction of some metals (e.g. aluminum);

  1. production of some gases (e.g. hydrogen);
  2. purification of some metals (eg. copper).

(b)        In the school laboratory, we use electrolysis to:

  1. calibrate ammeter;
  2. electrolyze acidified water.
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