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Questions and Answers
What is the process of converting electrical energy into chemical energy?
What is the process of converting electrical energy into chemical energy?
Oxidation occurs at the anode.
Oxidation occurs at the anode.
True
What is the primary application of electrochemical cells?
What is the primary application of electrochemical cells?
Generating electricity
Match the following terms with their definitions:
Match the following terms with their definitions:
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The electrode at which reduction occurs is called the __________.
The electrode at which reduction occurs is called the __________.
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What is the purpose of a salt bridge in an electrochemical cell?
What is the purpose of a salt bridge in an electrochemical cell?
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Electrolysis is a spontaneous process.
Electrolysis is a spontaneous process.
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What is the direction of electron flow in an electrochemical cell?
What is the direction of electron flow in an electrochemical cell?
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The __________ is the electrode at which oxidation occurs.
The __________ is the electrode at which oxidation occurs.
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Match the following terms with their respective electrode processes:
Match the following terms with their respective electrode processes:
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Study Notes
Electrochemistry
- Electrolysis: A process of decomposition of a substance using an electric current.
- Electrolyte: A substance that conducts electricity when dissolved in water or melted.
- Electrodes: Rods or plates immersed in an electrolyte, through which electric current is passed.
Types of Electrodes
- Anode: The electrode at which oxidation occurs, and electrons are lost.
- Cathode: The electrode at which reduction occurs, and electrons are gained.
Electrolysis of Water
- Hydrogen evolution: The process of hydrogen gas formation at the cathode during electrolysis of water.
- Oxygen evolution: The process of oxygen gas formation at the anode during electrolysis of water.
- 2H2O → 2H2 + O2: The overall reaction of electrolysis of water.
Electrochemical Cell
- Galvanic cell: A cell that generates electricity through a spontaneous redox reaction.
- Voltaic cell: Another name for a galvanic cell.
- Anodic oxidation: Oxidation at the anode in a galvanic cell.
- Cathodic reduction: Reduction at the cathode in a galvanic cell.
Daniell Cell
- A commercially available galvanic cell: Consists of a copper pot and a zinc rod immersed in a copper sulfate solution.
- Zn → Zn2+ + 2e- (at anode) and Cu2+ + 2e- → Cu (at cathode): The half-cell reactions in a Daniell cell.
Nernst Equation
- E = E° - (RT/nF) * ln(Q): The equation that relates the cell potential (E) to the standard potential (E°), temperature (T), and reactant concentrations (Q).
- E°: The standard potential of a cell at standard conditions (1M concentrations, 298K, 1 atm).
- R: The gas constant, T: Temperature in Kelvin, n: Number of electrons transferred, F: Faraday's constant, Q: Reactant concentrations.
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Description
Test your understanding of electrochemistry with this quiz, covering topics such as electrolysis, batteries, and more. Suitable for 12th class students in Maharashtra.
