Electrochem

electrolytic capacitor Cell

LESSON 7

Electrolysis/Electrolytic Cells Section 11.



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Recall the galvanic cubicle: spontaneous overall reception cell effectiveness has a positive value converts chemical free efficacy into galvanising cipher electrons flow from a higher potential energy to a lower potential energy electrical energy passel be used to move electrons from a lower potential energy to a higher potential energy a cell that uses energy to do this is called an electrolytic cell

Electrolytic Cell
converts electrical energy into chemical energy process is called electrolysis overall reaction is non-spontaneous, requires E includes electrodes, at least one electrolyte, an external artificial lake of electricity, and external circuit possible for electrolytic cells to have the two half-reactions take place in the same container galvanic cell reactants products + electrical energy electrolytic cell

Galvanic Cell vs Electrolytic Cell
Spontaneous reaction Converts chemical energy to electrical energy Anode (negative): zinc Cathode (positive): copper Oxidation at anode: Zn ? Zn2+ + 2e diminution at cathode: Cu2+ + 2e ? Cu Cell reaction: Zn + Cu2+ ? Zn2+ + Cu Electrons move to cathode Anions move to anode Cations move to cathode Non-spontaneous reaction Converts electrical energy to chemical energy Anode (positive): copper Cathode (negative): zinc Oxidation at anode: Cu ? Cu2+ + 2e Reduction at cathode: Zn2+ + 2e ? Zn Cell reaction: Cu + Zn2+ ? Cu2+ + Zn Electrons move to cathode Anions move to anode Cations move to cathode

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Predicting products of electrolysis
bill 1: Make a list of all substances present. tick all possible oxidizing and reducing agents present. (Dont forget body of water for aqueous solutions) Step 2: Use the redox plank to diagnose the strongest oxidizing agent. Write the equation for the step-down half-reaction that occurs at the cathode, including the reduction potential, Step 3: Use the redox table to identify the strongest reducting agent. Write the equation...If you want to get a full essay, prepare it on our website: Orderessay



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