CIE Nov 2015 v1 Paper 4 Q5

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X is a metallic element. (a) (i) Draw a fully labelled diagram to show how the standard electrode potential, E o, of X2+(aq) / X(s) could be measured. PMT [4] (ii) What are the conditions needed for the value measured to be a standard electrode potential?[1] (iii) State the charge carriers that transfer current through the solutions,the wire.[1]UCLES 2015 9701/41/O/N/15<br /> PMT (b) An electrochemical cell was set up consisting of an X2+(aq) / X(s) half-cell (E o = 0.40 V) and an Ag+(aq) / Ag(s) half-cell (E o = +0.80 V). (i) Write an equation for the reaction that would take place if the electrodes of this cell were connected by a wire.[1] When the current was allowed to pass for a period of time,the Ag electrode gained 1.30 g in mass, the electrode made of metal X lost 0.67 g in mass. (ii) Calculate the Ar of metal X; hence suggest an identity for X. Show all your working. Use of the Data Booklet is relevant to this question. Ar =X is[4] [Total: 11]UCLES 2015 9701/41/O/N/15 [Turn over<br />

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