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Questions and Answers
The Daniell cell operates by converting chemical energy into thermal energy.
The Daniell cell operates by converting chemical energy into thermal energy.
False
When an opposing voltage of 1.1 V is applied to the Daniell cell, the reaction stops and no current flows.
When an opposing voltage of 1.1 V is applied to the Daniell cell, the reaction stops and no current flows.
True
The reaction in a galvanic cell can continue indefinitely without external voltage applied.
The reaction in a galvanic cell can continue indefinitely without external voltage applied.
False
When the external voltage exceeds 1.1 V, the Daniell cell functions as an electrolytic cell.
When the external voltage exceeds 1.1 V, the Daniell cell functions as an electrolytic cell.
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Zinc is the cathode and copper is the anode in the Daniell cell.
Zinc is the cathode and copper is the anode in the Daniell cell.
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Study Notes
Daniell Cell Overview
- Converts chemical energy from redox reactions into electrical energy.
- Reaction: Zn(s) + Cu²⁺(aq) → Zn²⁺(aq) + Cu(s) with a potential of 1.1 V at 1 mol dm⁻³ concentration.
Types of Electrochemical Cells
- Galvanic/Voltaic Cell: Generates electrical energy from spontaneous reactions.
- When an external voltage is applied slowly, the reaction continues until the opposing voltage reaches 1.1 V.
- At 1.1 V, the reaction stops, and no current flows.
Electrolytic Cell Function
- Increasing external potential beyond 1.1 V reverses the reaction, turning the cell into an electrolytic cell.
- This setup uses electrical energy to force non-spontaneous chemical reactions.
Important Concepts
- Activity vs Concentration: While activity is preferable to use, in dilute solutions, activity approximates concentration.
- Future studies will elaborate on the relationship between activity and concentration.
Components of Daniell Cell
- Composed of zinc and copper electrodes immersed in respective salt solutions (ZnSO₄ and CuSO₄).
- Electron Flow: Electrons flow from copper to zinc.
- Current Flow: Conventional current flows from zinc to copper.
- Zinc is deposited at the zinc electrode while copper dissolves from the copper electrode.
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Description
This quiz explores the fundamentals of the Daniell Cell, including how it converts chemical energy into electrical energy and its operation as both a galvanic and electrolytic cell. Delve into the underlying reactions, potential, and important concepts like activity versus concentration.
