Concentration Cells and Electron Flow

The video tutorial explains concentration cells, a type of galvanic cell where the same electrode and substance are used, differing only in ion concentration. It details the mechanism of electron flow from anode to cathode, driven by concentration differences, and how to calculate cell potential using the Nernst equation. An example with iron electrodes illustrates how different concentrations affect voltage and electron flow direction.

What is a concentration cell?

• A galvanic cell with different electrodes

• A galvanic cell with the same electrode and substance but different ion concentrations

• A cell that does not produce electricity

• A cell that uses only non-metal electrodes

In a concentration cell, where does oxidation occur?

• At the cathode

• In the solution with higher concentration

• At the anode

• In the salt bridge

What is the direction of electron flow in a concentration cell?

• From high concentration to low concentration

• From the salt bridge to the electrodes

• From cathode to anode

• From anode to cathode

Which equation is used to calculate the cell potential in a concentration cell?

• Nernst Equation

• Faraday's Law

• Boyle's Law

• Ohm's Law

What is the standard cell potential for a concentration cell?

• 0 V

• 0.0591 V

• 1.0 V

• 0.34 V

How is the reaction quotient Q calculated in a concentration cell?

• By multiplying the concentrations of reactants and products

• By adding the concentrations of reactants and products

• By dividing the concentration of reactants by products

• By dividing the concentration of products by reactants

In the example with copper ions, what is the value of Q?

• 0.2

• 3.0

• 1.0

• 0.0667

What are the possible concentrations for the right half-cell in the iron electrode example to achieve 0.05 volts?

• 0.01 M and 10 M

• 0.5 M and 1 M

• 0.002 M and 4.9 M

• 0.1 M and 5 M

In the iron electrode example, what happens to the Fe2+ concentration at the anode?

• It becomes zero

• It remains constant

• It decreases

• It increases

What determines the direction of electron flow in a concentration cell?

• The type of electrode used

• The concentration difference between the two solutions

• The temperature of the solutions

• The size of the electrodes