Electrochemical Cells
Chemistry ⇒ Redox Reactions and Electrochemistry
Electrochemical Cells starts at 11 and continues till grade 12.
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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?
Describe the difference between a galvanic cell and an electrolytic cell.
Describe the role of the external circuit in an electrochemical cell.
Describe what happens to the mass of the anode and cathode as a galvanic cell operates.
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?
Calculate the cell potential at 25°C for a cell with the following reaction: Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s), if [Zn2+] = 0.10 M, [Cu2+] = 1.0 M, Ecell° = 1.10 V. (Use the Nernst equation: E = E° - (0.0592/n) log Q, n = 2)
Calculate the number of moles of electrons transferred in the following reaction: 2Ag+(aq) + Cu(s) → 2Ag(s) + Cu2+(aq)
Calculate the standard cell potential (Ecell°) for a cell made of Mg(s) | Mg2+(aq) || Ag+(aq) | Ag(s), given EMg2+/Mg° = -2.37 V and EAg+/Ag° = +0.80 V.
In a Daniell cell, which metal acts as the anode? (1) Copper (2) Zinc (3) Silver (4) Iron
The standard electrode potential of a half-cell is measured under which conditions? (1) 1 atm pressure, 1 M concentration, 25°C (2) 2 atm pressure, 2 M concentration, 0°C (3) 1 atm pressure, 0.1 M concentration, 100°C (4) 1 atm pressure, 1 M concentration, 0°C
Which of the following best describes an electrochemical cell? (1) A device that converts chemical energy into electrical energy (2) A device that converts electrical energy into chemical energy (3) A device that stores heat energy (4) A device that measures temperature
Which of the following is a correct representation of the standard hydrogen electrode? (1) Pt(s) | H2(g, 1 atm) | H+(aq, 1 M) (2) H2(g, 1 atm) | Pt(s) | H+(aq, 1 M) (3) Pt(s) | H+(aq, 1 M) | H2(g, 1 atm) (4) Pt(s) | H2(g, 1 atm) | H+(aq, 1 M)
Fill in the blank: In an electrochemical cell, the flow of electrons in the external circuit is from _______ to _______.
Fill in the blank: The cell potential (Ecell) of a galvanic cell is always _______ under standard conditions.
Fill in the blank: The movement of ions through the salt bridge completes the _______ in an electrochemical cell.
Fill in the blank: The standard cell potential is calculated as Ecell° = Ecathode° - Eanode°. If Ecathode° = 0.80 V and Eanode° = -0.76 V, then Ecell° = _______ V.
True or False: Electrons flow from the cathode to the anode in an external circuit of a galvanic cell.
True or False: In a galvanic cell, the anode is always the site of oxidation.
True or False: The cell potential can be used to predict the spontaneity of a redox reaction.
True or False: The cell potential is independent of the concentrations of the solutions in the half-cells.
