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Questions and Answers
What is the process that occurs when a direct electric current flows through an electrolysis cell under a potential of several volts?
What is the process that occurs when a direct electric current flows through an electrolysis cell under a potential of several volts?
- Ionization
- Reduction
- Electrolysis (correct)
- Oxidation
What is oxidation in terms of chemical reactions?
What is oxidation in terms of chemical reactions?
- Combination with positive ions
- Removal of electrons (correct)
- Addition of electrons
- Discharge of negative ions
Where does reduction occur in an electrolysis cell?
Where does reduction occur in an electrolysis cell?
- Negative ions
- Cathode (correct)
- Positive ions
- Anode
According to the ionic theory, what happens to electrolytes in solution or in the molten state during electrolysis?
According to the ionic theory, what happens to electrolytes in solution or in the molten state during electrolysis?
What is the function of electricity in the process of electrolysis according to the ionic theory?
What is the function of electricity in the process of electrolysis according to the ionic theory?
In an electrolysis cell, where do negative ions carry electrons and discharge them?
In an electrolysis cell, where do negative ions carry electrons and discharge them?
What carries the current in a solution during electrolysis?
What carries the current in a solution during electrolysis?
What is added to a chemical species during reduction?
What is added to a chemical species during reduction?
Where do electrons enter the electrolysis cell from?
Where do electrons enter the electrolysis cell from?
Which of the following is a requirement for electrolysis to occur?
Which of the following is a requirement for electrolysis to occur?
What is the process called when electrons are removed from a chemical species?
What is the process called when electrons are removed from a chemical species?
Where do positive ions or cations combine with electrons during electrolysis?
Where do positive ions or cations combine with electrons during electrolysis?
What is the function of the anode in an electrolysis cell?
What is the function of the anode in an electrolysis cell?
What theory explains the process of electrolysis?
What theory explains the process of electrolysis?
What is the purpose of the external circuit in an electrolysis cell?
What is the purpose of the external circuit in an electrolysis cell?
What is the minimum potential difference required for electrolysis to occur?
What is the minimum potential difference required for electrolysis to occur?
Study Notes
Electrolysis
- Electrolysis occurs when a direct electric current flows through an electrolysis cell under a potential of several volts, resulting in a chemical reaction.
- Electrons enter the cell from the battery or generator at the cathode, combining with positive ions or cations in the solution, and the cations are reduced.
- Negative ions or anions carry electrons through the solution and discharge them at the anode, resulting in oxidation.
Mechanism of Electrolysis
- The process of electrolysis is explained by the theory of ionization.
- Electrolytes are present as ions in solution or in the molten state, and the function of electricity is to direct these ions to their respective electrodes.
- Electrolysis is possible in either molten state or in the form of a solution.
Reduction and Oxidation
- Reduction is the addition of electrons to a chemical species.
- Oxidation is the removal of electrons from a chemical species.
- Reduction occurs at the cathode, where electrons enter from the external circuit and are added to the chemical species in solution.
- Oxidation occurs at the anode, where electrons are removed from a chemical species in solution and go to the external circuit.
Current in a Solution
- The current in a solution consists of a flow of positive and negative ions toward the electrodes.
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Description
Test your knowledge on the chemical reaction that occurs during electrolysis when an electric current flows through an electrolysis cell. Learn about the roles of cathode, anode, cations, and anions in the process.
