Electrochemistry PRE lAB

Which of the following is the main difference between a galvanic cell and an electrolytic cell?

• A galvanic cell requires an external power source, while an electrolytic cell generates electrical energy.

• A galvanic cell generates electrical energy from spontaneous reactions, while an electrolytic cell requires an external power source to drive non-spontaneous reactions.

• A galvanic cell uses only metal electrodes, while an electrolytic cell uses only non-metal electrodes.

• A galvanic cell operates at high temperatures, while an electrolytic cell operates at low temperatures.

What does the voltmeter reading in a galvanic cell experiment represent?

• The resistance of the cell.

• The potential difference between the two electrodes of the cell

• The total energy consumed by the cell

• The amount of current flowing through the circuit

Which of the following diagrams shows the experimental setup to obtain the standard reduction potential value?

• A diagram showing two half-cells in difference container (beaker) connected by a salt bridge and a voltmeter.

• A diagram showing a single electrode submerged in a solution with a power supply.

• A diagram showing a single half-cell with no external connection.

• A diagram showing two electrodes placed in a single beaker without a salt bridge.

How can the standard reduction potential value be determined using the standard cell potential?

• By subtracting the standard electrode potential of the anode from the cathode.

• By adding the standard electrode potentials of the anode and cathode.

• By dividing the standard cell potential by the number of electrons transferred.

• By using the Nernst equation to calculate the potential.

Which of the following is the difference between standard electrode potential and standard cell potential?

• Standard electrode potential is the potential difference for a half-reaction at the electrode, while standard cell potential is the potential difference between two half-cells in a complete electrochemical cell.

• Standard electrode potential refers to the voltage of the entire electrochemical cell, while standard cell potential refers to the voltage of a single half-cell.

• Standard electrode potential measures the potential of non-spontaneous reactions, while standard cell potential measures the potential of spontaneous reactions.

• Standard electrode potential is measured under non-standard conditions, while standard cell potential is measured under standard conditions.

Which of the following is the condition for the measurement of the standard cell potential?

• Both electrodes must be at standard concentration (1 M for solutions, 1 atm for gases) and the temperature must be 298 K.

• The electrodes must be made of the same material and the solution must be of varying concentrations.

• The cell must be operating at a temperature of 373 K and pressure of 2 atm.

• The cell must be connected to an external power supply to drive the reaction.

Which of the following equations shows the relationship between cell potential (E_cell) and standard cell potential (E°_cell)?

• E_cell = E°_cell + (RT/nF) * log(Q)

• E_cell = E°_cell - (RT/nF) * log(Q)

• E_cell = E°_cell + (nF/RT) * log(Q)

• E_cell = E°_cell - (nF/RT) * log(Q)

What does the voltmeter reading in a galvanic cell represent?

• The total energy consumed in the cell.

• The potential difference between the two electrodes, indicating the cell's ability to do work.

• The concentration of ions in the electrolyte solution.

• The temperature of the electrolyte solution.

How can the anode and cathode be determined from the set up of an electrolytic cell?

• The anode is the electrode connected to the positive terminal of the power supply, and the cathode is connected to the negative terminal.

• The anode is the electrode where reduction occurs, and the cathode is where oxidation takes place.

• The anode is the electrode submerged in the electrolyte solution, and the cathode is the one exposed to air.

• The anode is the electrode with the higher concentration of ions, and the cathode has a lower concentration of ions.

Which of the following precautions should be taken when carrying out a galvanic cell experiment?

• Both half-cells should be at the same temperature and have the same concentration of solutions.

• The electrodes should be cleaned properly to avoid contamination.

• The salt bridge should be kept dry to prevent any electrolyte leakage.

• The voltmeter should be connected in series with the cell to measure the current.