Perform g h t s electrode the two solid metals that

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Unformatted text preview: s redox reaction can be used spontaneous to perform electrical work. perform ∆ G = ∆ H − T ∆S Electrode: The two solid metals that are connected by external circuit Voltaic or Galvanic cells are devices in which electron transfer occurs via an external circuit rather than directly between reactants. The actual charge on the the electrode are zero. zero Anode: the electrode at which the oxidation occurs Cathode: the electrode at which the reduction occurs Voltaic Voltaic Cells (Galvanic Cells) Salt bridge: to complete the electrical circuit. Cations move to Cations from anode to cathode, Anions move from cathode to anode anode cathode Anions cathode anode Anode: * Loses electrons and mass *Oxidation takes place * Electrons are released to the ex. circuit Cathode: * Gains electrons Gains electrons and mass *Reduction takes takes place * Electrons are received from ex. circuit. Voltaic Voltaic Cells Salt bridge Porous disc Voltaic cell (Galvanic Cells): an electrochemical cell in which the spontaneous reaction is used to generate electricity. The The Notation of Cell A Vertical line: interface interface between different phase (−) Zn( s) | Zn 2+ (aq, cZn2+ ) || Cu 2+ (aq, cCu 2+ ) | Cu ( s)(+) (−) Zn( s) | Zn 2+ (aq) || Cu 2+ | Cu ( s)(+) Physical Physical state Double Vertical line: salt bridge or porous disc or Anode Oxidation cathode Reduction The The Notation of Cell (a) Write a notation for a cell with hydrogen electrode on the left...
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