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What reaction occurs at the Cathode?
Reduction
What reaction occurs at the Anode?
Oxidation
What direction do electrons flow in electrolysis and voltaic cells?
Anode → Cathode
Charge of Cathode (Electrolysis)
-
Charge of Anode (Electrolysis)
+
Charge of Cathode (Voltaic cell)
+
Charge of Anode (Voltaic cell)
-
Function of salt bridge in voltaic cells
Allow ions to flow between half-cells to balance the charge and complete the circuit
Where do cations flow towards?
Cathode
Where do anions flow towards?
Anode
Which electrochemical cells are reversible?
Secondary cells
Examples of secondary cells
Lead-acid and lithium-ion batteries
Advantages of Lead-acid batteries
Easy to manufacture, low cost and low self-discharge rates
Advantages of lithium-ion batteries
High energy density and low discharge rates
Disadvantages of lithium-ion batteries
Explosion risk and difficult to extinguish lithium fires
Energy change in electrolytic cell
Electrical to chemical
Energy change of voltaic cell
Chemical to electrical
Spontaneity of electrolytic cell
non-spontaneous
Spontaneity of voltaic cell
Spontaneous
