Sandoval Bradley
01/02/2023 · Junior High School
B: Voltaic cells - measuring cell potentials. 2.4 Use the \( \mathrm{Mg} / \mathrm{Pb} \) electrochemical cell to answer the following questions: (a) If electricity is a flow of electrons, explain how the flow of electrons occurs. (2) (b) Write down the half-reactions occurring at each electrode (anode / cathode) (2) (c) What is the net cell reaction? (1)
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(a) Electrons flow from the anode to the cathode in a voltaic cell due to the difference in potential energy between the electrodes.
(b) Anode: \(\mathrm{Mg (s) \rightarrow Mg^{2+} (aq) + 2e^-}\); Cathode: \(\mathrm{Pb^{2+} (aq) + 2e^- \rightarrow Pb (s)}\).
(c) Net cell reaction: \(\mathrm{Mg (s) + Pb^{2+} (aq) \rightarrow Mg^{2+} (aq) + Pb (s)}\).
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