Electrochemistry

SenSna/Smksr/chem./

Electrochemistry 1. Diagram shows two types of cells.

(a) Write the ionic formulae of all cations in copper (II) sulphate solution. ………………………………………………………………………………………………… (b) State the energy changes in cell P and cell Q. Cell P :……………………………

Cell Q

:..........…………………………..

(c) Write the half equation for the reaction that occurs at the cathode in cell P. …………………………………………………………………………………………………... (d) (i) Is there any colour change of the copper(II) sulphate solution in cell P? …………………………………………………………………………………………………... (ii) Explain your answer in (d)(i). ……………………………………………………………………………………………………………..

(e) State the negative terminal in cell Q. …………………………………………………………………………………………………

(f) If the zinc plate is replaced with a magnesium plate, what will happen to the voltmeter reading in cell Q? ………………………………………………………………………………………… 2. The diagram below shows the set up of apparatus to investigate the electrolysis of dilute silver nitrate with carbon electrode and dilute copper(II) sulphate copper electrode.

a) In the electrolysis of Cell 1 (i) What is the observation at electrode B? …………………………………………………………………………………………………………………… (ii) Write the half equation for the reaction at electrode B …………………………………………………………………………………………………………………… d) In the electrolysis of Cell 2 (i) What is the observation at electrode C? …………………………………………………………………………………………………………………… (ii) Write the half equation for the reaction at electrode C …………………………………………………………………………………………………………………… f ) A student intend to electroplate an iron ring with silver . Draw a label diagram to show the set up of apparatus to electroplate the iron ring.