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Questions and Answers
What is the purpose of a salt bridge in an electrochemical cell?
What is the purpose of a salt bridge in an electrochemical cell?
maintain electrical neutrality in the half-cells via migration of ions
What is the cathode in an alkaline battery?
What is the cathode in an alkaline battery?
MnO2
What is the anode in an alkaline battery?
What is the anode in an alkaline battery?
Zn powder
What is the cathode in the hydrogen fuel cell?
What is the cathode in the hydrogen fuel cell?
In a lead-acid battery, what is the anode?
In a lead-acid battery, what is the anode?
What is one of the differences between a voltaic cell and an electrolytic cell?
What is one of the differences between a voltaic cell and an electrolytic cell?
What is the term for the gain of electrons by an element?
What is the term for the gain of electrons by an element?
What is the electrode at which oxidation occurs called?
What is the electrode at which oxidation occurs called?
In a voltaic cell, electrons flow from the ________ to the _____________.
In a voltaic cell, electrons flow from the ________ to the _____________.
The more _______ the value of Ered, the greater the driving force for reduction.
The more _______ the value of Ered, the greater the driving force for reduction.
Galvanized iron is coated with __________.
Galvanized iron is coated with __________.
What retards corrosion of iron?
What retards corrosion of iron?
Flashcards
Salt Bridge Purpose
Salt Bridge Purpose
Maintains electrical neutrality in half-cells by allowing ion migration.
Alkaline Battery Cathode
Alkaline Battery Cathode
Manganese dioxide ((MnO_2)).
Alkaline Battery Anode
Alkaline Battery Anode
Zinc powder.
Hydrogen Fuel Cell Cathode
Hydrogen Fuel Cell Cathode
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Lead-Acid Battery Anode
Lead-Acid Battery Anode
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Voltaic vs. Electrolytic Cells
Voltaic vs. Electrolytic Cells
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Reduction
Reduction
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Electrode Where Oxidation Occurs
Electrode Where Oxidation Occurs
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Electron Flow in Voltaic Cell
Electron Flow in Voltaic Cell
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Ered and Reduction Force
Ered and Reduction Force
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Coating on Galvanized Iron
Coating on Galvanized Iron
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Conditions That Retard Iron Corrosion
Conditions That Retard Iron Corrosion
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Study Notes
Salt Bridge Function
- Maintains electrical neutrality in electrochemical cells through ion migration.
Alkaline Battery Components
- Cathode material: Manganese dioxide (MnO2).
- Anode material: Zinc powder (Zn).
Hydrogen Fuel Cell
- Cathode material: Potassium hydroxide (KOH).
Lead-Acid Battery
- The anode is made of lead (Pb), with electrodes consumed during operation.
Cell Types
- Voltaic cells generate spontaneous reactions; electrolytic cells force nonspontaneous reactions.
Reduction Process
- Gain of electrons by an element defines reduction.
Oxidation Location
- Oxidation occurs at the anode in an electrochemical cell.
Electron Flow in Voltaic Cells
- Electrons flow from the anode to the cathode.
Reduction Driving Force
- A more positive Ered value indicates a greater driving force for reduction.
Galvanization
- Iron is protected against corrosion by coating with zinc (galvanized iron).
Corrosion Prevention
- High pH conditions help retard the corrosion of iron.
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