Questions and Answers
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?
MnO2
What is the anode in an alkaline battery?
Zn powder
What is the cathode in the hydrogen fuel cell?
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In a lead-acid battery, what is the anode?
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What is one of the differences between a voltaic cell and an electrolytic cell?
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What is the term for the gain of electrons by an element?
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What is the electrode at which oxidation occurs called?
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In a voltaic cell, electrons flow from the ________ to the _____________.
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The more _______ the value of Ered, the greater the driving force for reduction.
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Galvanized iron is coated with __________.
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What retards corrosion of iron?
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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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Description
Test your knowledge of key concepts in electrochemistry with these flashcards. This quiz includes definitions and roles of components such as salt bridges, cathodes, and anodes specific to various types of batteries and fuel cells. Perfect for students looking to reinforce their understanding of electrochemical processes.
