Electrochemical Cells
Physics ⇒ Electricity and Magnetism
Electrochemical Cells starts at 10 and continues till grade 12.
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See sample questions for grade 11
A cell is constructed with the following half-cells: Fe2+/Fe (E° = -0.44 V) and Pb2+/Pb (E° = -0.13 V). Which metal will act as the anode?
A student sets up a galvanic cell with Mg and Cu electrodes. The standard reduction potentials are: Mg2+ + 2e- → Mg (E° = -2.37 V), Cu2+ + 2e- → Cu (E° = 0.34 V). What is the standard cell potential?
Calculate the cell potential at 25°C for a cell with the following half-reactions: Ag+ + e- → Ag (E° = 0.80 V), Cu2+ + 2e- → Cu (E° = 0.34 V). Assume standard conditions.
Describe the flow of ions in the salt bridge of a galvanic cell.
Describe what happens to the mass of the anode and cathode in a galvanic cell during operation.
Explain the difference between a galvanic cell and an electrolytic cell.
Explain why a salt bridge is necessary in a galvanic cell but not in a single-compartment cell.
In a Daniell cell, zinc is used as the anode and copper as the cathode. Which metal is oxidized?
State the main function of the salt bridge in a galvanic cell.
The cell potential (Ecell) of a galvanic cell is calculated as Ecell = Ecathode - Eanode. If Ecathode = 0.34 V and Eanode = -0.76 V, what is the cell potential?
The standard cell potential for a cell is positive. What does this indicate about the cell reaction?
A certain electrochemical cell has the following cell notation: Pt | H2(g, 1 atm) | H+(1 M) || Ag+(1 M) | Ag. Given that the standard reduction potential for Ag+/Ag is 0.80 V, calculate the standard cell potential and identify which electrode is the anode.
A galvanic cell is constructed using the following half-cells: MnO4- + 8H+ + 5e- → Mn2+ + 4H2O (E° = 1.51 V) and Fe3+ + e- → Fe2+ (E° = 0.77 V). Calculate the standard cell potential and write the balanced overall cell reaction.
A galvanic cell is set up with the following half-cells at 25°C: Cd2+ + 2e- → Cd (E° = -0.40 V) and Ni2+ + 2e- → Ni (E° = -0.23 V). If the concentration of Ni2+ is 0.10 M and Cd2+ is 1.0 M, calculate the cell potential using the Nernst equation.
A student claims that in all electrochemical cells, the anode is always negative. Is this statement true or false? Justify your answer.
Explain why the cell potential of a galvanic cell decreases as the cell operates over time.
In an electrolytic cell used for the electrolysis of molten NaCl, which ions migrate towards the cathode and what reaction occurs at the cathode?
State the Nernst equation for a general electrochemical cell and explain the significance of each term.
