Cell Potential and Voltaic Cells

The video tutorial by Ms. Cam explains how to calculate cell potential in voltaic cells. It begins with a definition of cell potential as the voltage difference between two half-cells. The tutorial provides an example using zinc and copper half-cells, explaining the roles of anode and cathode. It details the calculation of cell potential using standard electrode potentials and provides examples with zinc-copper and magnesium-iron cells. The video emphasizes that a positive cell potential indicates a spontaneous reaction, while a negative value indicates non-spontaneity. The tutorial concludes with a summary and a preview of the next topic on Gibbs free energy.

What is the primary function of a salt bridge in a voltaic cell?

• To prevent the mixing of different solutions

• To maintain electrical neutrality by allowing ion flow

• To allow the flow of electrons between half cells

• To increase the cell potential

In a voltaic cell, where does oxidation occur?

• At the cathode

• At the anode

• In the external circuit

• In the salt bridge

How is the cell potential calculated using standard electrode potentials?

• By multiplying the potentials of both half cells

• By subtracting the anode potential from the cathode potential

• By adding the potentials of both half cells

• By dividing the cathode potential by the anode potential

Which property of voltage is highlighted when using standard electrode potentials?

• It depends on the concentration of solutions

• It is an extensive property

• It is an intensive property

• It varies with temperature

What determines the anode in a voltaic cell?

• The half cell with the larger surface area

• The half cell with the higher concentration

• The half cell with the more negative standard electrode potential

• The half cell with the more positive standard electrode potential

In a zinc-copper voltaic cell, which half cell acts as the cathode?

• Neither acts as a cathode

• Both act as cathodes

• Copper half cell

• Zinc half cell

What does a positive cell potential indicate about a reaction?

• The reaction is endothermic

• The reaction is at equilibrium

• The reaction is spontaneous

• The reaction is non-spontaneous

In a magnesium-iron voltaic cell, which half cell undergoes oxidation?

• Magnesium half cell

• Iron half cell

• Both undergo oxidation

• Neither undergoes oxidation

What happens to the cell potential when a reaction is reversed?

• It changes sign

• It becomes zero

• It remains the same

• It doubles

What does a negative cell potential signify about a reaction?

• The reaction is non-spontaneous

• The reaction is spontaneous

• The reaction is at equilibrium

• The reaction is exothermic