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When Zinc metal reacts with copper ions,zinc metal became zinc ions and copper ions became copper
metal due to transfer of electrons from zinc metal to the copper ion. To get electrical
energy these electrons must flow in an external conductor from the zinc to copper. The
potential or voltage will reflect the greater activity of zinc over copper. The current
flowing will depend on the extent and rate of the reaction.
2.84 Electrical energy from the displacement of copper by zinc
Put concentrated copper sulphate solution in a beaker. Connect copper foil to the positive
terminal of a 5 V voltmeter. Connect zinc foil to the negative terminal. Dip the two metals
briefly into the copper sulphate solution. Note any changes in the voltmeter reading. Note
the maximum reading. Note any changes at the copper foil and the zinc foil. The voltage
falls to zero after a short time because copper deposited on the zinc and caused the
reaction to stop.
sharon kalunda answered the question on April 12, 2019 at 09:08
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