Cell Potential and Gibbs Free Energy

The video tutorial covers the calculation of standard cell potential for galvanic cells and the equilibrium constant (K). It explains how to adjust half-reactions to achieve a positive cell potential and how to calculate K using the cell potential. The tutorial also demonstrates converting K into cell potential and reviews the characteristics of spontaneous, equilibrium, and non-spontaneous reactions, including the relationships between delta G, cell potential, and K.

What is the purpose of adjusting half-reactions in a galvanic cell?

• To ensure the total cell potential is positive

• To ensure the electrons are on the same side

• To increase the number of electrons involved

• To make the total cell potential negative

Which formula relates Gibbs free energy to the equilibrium constant?

• K = e^(nFE/RT)

• E = RT ln K / nF

• ΔG = -RT ln K

• ΔG = nFE

What is the value of Faraday's constant used in these calculations?

• 8.3145 J/mol·K

• 96,485 C/mol

• 0.93 V

• 298 K

How can you calculate the cell potential if you know the equilibrium constant?

• Using ΔG = nFE

• Using ΔG = -RT ln K

• Using K = e^(nFE/RT)

• Using E = RT ln K / nF

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

• It becomes negative if it was positive

• It becomes positive if it was negative

• It remains unchanged

• It becomes zero

What is the cell potential for a reaction if the combined potentials of two reactions are 0.467 V and 0.23 V?

• 0.237 V

• 0.697 V

• 0.467 V

• 0.23 V

In a spontaneous reaction, what is the sign of the cell potential?

• Positive

• Undefined

• Zero

• Negative

What is the value of K for a reaction at equilibrium?

• Greater than one

• Less than one

• Equal to one

• Undefined

Which of the following is true for a non-spontaneous process?

• ΔG is negative

• Cell potential is positive

• K is greater than one

• Cell potential is negative

What is the relationship between ΔG and cell potential?

• ΔG = nFE

• ΔG = -nFE

• ΔG = -RT ln K

• ΔG = RT ln K