Schmidt Parry
04/07/2024 · High School
2.4 Use the Mg | 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 (Mg) to the cathode (Pb) through an external circuit.
(b) Anode: Mg (s) → Mg2+ (aq) + 2e-, Cathode: Pb2+ (aq) + 2e- → Pb (s)
(c) Net cell reaction: Mg (s) + Pb2+ (aq) → Mg2+ (aq) + Pb (s)
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