Electrochemistry — Flashcards

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Electrochemistry is the branch of chemistry that deals with the study of the conversion of chemical energy into electrical energy or vice versa and their mutual relationship.

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A galvanic cell is a device that converts chemical energy into electrical energy through a spontaneous redox reaction. Examples include Volta cell, Daniell cell, Leclanche cell, and dry cell.

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An electrolytic cell is a device that converts electrical energy into chemical energy by passing D.C. current through an electrolyte or fused salt to cause a non-spontaneous redox reaction.

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Balanced cell reaction: Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s). At the anode, Zn is oxidised: Zn(s) → Zn2+(aq) + 2e−. At the cathode, Cu2+ is reduced: Cu2+(aq) + 2e− → Cu(s).

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Oxidation occurs at the anode and reduction occurs at the cathode. Zinc loses electrons more easily, so it is oxidised: Zn(s) → Zn2+(aq) + 2e−. Copper ions gain electrons, so reduction occurs at coppe…

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In a galvanic cell, anode is of negative polarity and cathode is of positive polarity. Electrons flow from anode to cathode through the external circuit.

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A salt bridge completes the electrical circuit by allowing ions to flow from one half cell to another and maintains electrical neutrality in the two half cells. It does not take part in the redox reac…

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The Daniell cell is represented as: Zn | Zn2+(aq) || Cu2+(aq) | Cu. The left side is the anode and the right side is the cathode.