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 Form 4 Electrochemistry Topical Questions and Answers

(a) What is an electrolyte?
(b) State how the following substances conduct electricity:
(i) Molten calcium chloride
(ii) Graphite.
(c ) The diagram below shows a set up that was used to electrolyze aqueous magnesium sulphate.
figelectrochemistry23420201743.JPG
(i) On the diagram above, using an arrow, show the direction of flow of electrons.
(ii) Identify the syringe in which hydrogen gas would be collected. Explain.
(d)Explain why the concentration of magnesium sulphate was found to have increased at the end of the experiment.
( e) During the electrolysis, a
current of 0.72 A was passed through the electrolyte for 15 minutes. Calculate the volume of gas produced at the anode. ( 1 Faraday=96500 coulombs; molar gas volume is 24000# cm^3# at room temperature).

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