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b) Silver metal is deposited on the spoon. A silver ion has a charge of +1. Write the half equation for this reaction. c) The voltage of a cell is 1.5V. Why does the voltage of the cell decrease when the cell is left connected in a circuit? d) Duralumin is an alloy of copper and aluminium. The table below shows the radii of aluminium and copper atoms. Answers: Explain why copper added to the aluminium to form the alloy will make the alloy stronger than pure aluminium. + - Ag + e Ag .................................................................................................................. .............................................................................................................................. ............................................................................................................................. Aluminium and copper atoms are a different size, and .................................................................................................................. this prevents the layers sliding over each other .................................................................................................................. 6V d.c. pure copper electrode 4. Impure copper can be purified by electrolysis using the Reactants are being used up -- copper. .................................................................................................................... b) Describe how each electrode will have changed at the end of the electrolysis process. .............................................................................................................................. ............................................................................................................................. apparatus shown . impure copper electrode copper sulphate solution a) Give the name of the electrode which is made from pure Cathode Metal Radius of atom/m aluminium 1.43 x 10-12 copper 1.27 x 10-12 Anode (impure copper) becomes smaller as copper atoms are .................................................................................................................. oxidised to form ions in the solution. .................................................................................................................. Cathode (pure copper ) becomes bigger as copper ions are .................................................................................................................. reduced and added to the electrodePDF Image | How to work with Electrolysis
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