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Questions and Answers
Which type of cell uses electrical energy to carry out non-spontaneous chemical reactions?
Which type of cell uses electrical energy to carry out non-spontaneous chemical reactions?
What is the Nernst equation used for in the context of electrochemical cells?
What is the Nernst equation used for in the context of electrochemical cells?
What property of a solution does resistivity (ρ) and conductivity (κ) of ionic solutions depend on?
What property of a solution does resistivity (ρ) and conductivity (κ) of ionic solutions depend on?
What does molar conductivity at zero concentration or infinite dilution (Λ°m) represent?
What does molar conductivity at zero concentration or infinite dilution (Λ°m) represent?
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What law enunciates the variation of molar conductivity with concentration for electrolytic solutions?
What law enunciates the variation of molar conductivity with concentration for electrolytic solutions?
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Which process can be explained as an electrochemical process involving the gradual destruction of metals by chemical or electrochemical reaction with their environment?
Which process can be explained as an electrochemical process involving the gradual destruction of metals by chemical or electrochemical reaction with their environment?
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What is the function of a galvanic or voltaic cell?
What is the function of a galvanic or voltaic cell?
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In electrochemical cells, when the external potential exceeds 1.1 V, the cell functions as:
In electrochemical cells, when the external potential exceeds 1.1 V, the cell functions as:
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What is the main difference between a galvanic cell and an electrolytic cell?
What is the main difference between a galvanic cell and an electrolytic cell?
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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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What happens when the opposing voltage applied in a galvanic cell reaches 1.1 V?
What happens when the opposing voltage applied in a galvanic cell reaches 1.1 V?
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What is the importance of studying electrochemistry?
What is the importance of studying electrochemistry?
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What are some products that can be produced by electrochemical methods?
What are some products that can be produced by electrochemical methods?
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What is the electrical potential of a Daniell cell when the concentration of Zn2+ and Cu2+ ions is unity?
What is the electrical potential of a Daniell cell when the concentration of Zn2+ and Cu2+ ions is unity?
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What happens when Eext < 1.1 V in a galvanic cell?
What happens when Eext < 1.1 V in a galvanic cell?
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What is the function of an electrolytic cell?
What is the function of an electrolytic cell?
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Study Notes
Electrochemical Cells
- Electrolytic cells utilize electrical energy to drive non-spontaneous chemical reactions.
- The Nernst equation calculates the cell potential based on concentrations of reactants and products.
- Resistivity (ρ) and conductivity (κ) of ionic solutions depend on the concentration of ions and their mobility.
Molar Conductivity
- Molar conductivity at infinite dilution (Λ°m) indicates how well an electrolyte conducts electricity per mole at very low concentrations.
- The Debye-Hückel theory describes the variation of molar conductivity with concentration for electrolytic solutions.
Corrosion and Electrochemical Processes
- Corrosion is the gradual destruction of metals due to chemical or electrochemical reactions with their environment.
- Galvanic or voltaic cells convert chemical energy into electrical energy through spontaneous reactions.
Cell Functions and Conditions
- When external potential exceeds 1.1 V, the galvanic cell operates as an electrolytic cell.
- The main difference between galvanic and electrolytic cells lies in their spontaneity: galvanic cells produce electricity spontaneously, while electrolytic cells require external energy.
Salt Bridge and External Voltage
- A salt bridge maintains electrical neutrality by allowing ions to flow between the anode and cathode compartments.
- When opposing voltage in a galvanic cell reaches 1.1 V, the cell may cease to produce current and behave like an electrolytic cell.
Importance of Electrochemistry
- Studying electrochemistry is critical for understanding energy conversion, storage, and corrosion processes.
- Electrochemical methods can produce various products, including metals, gases, and chemical compounds.
Daniell Cell and External Potential
- The electrical potential of a Daniell cell with Zn2+ and Cu2+ ions at unity concentration is a standardized measure of its voltage output.
- If the external potential (Eext) is less than 1.1 V in a galvanic cell, it continues to function normally, generating current.
Function of Electrolytic Cell
- An electrolytic cell facilitates non-spontaneous reactions through the application of an external power source, allowing for chemical changes that wouldn't occur naturally.
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Description
Test your understanding of electrochemical cells, Nernst equation, standard potential, Gibbs energy, resistivity, conductivity, and molar conductivity of ionic solutions with this quiz.
