Electrochemical Cells Concepts Assessment

The video tutorial covers electrochemical cells, focusing on cell potential, half reactions, and standard reduction potentials. It explains the relationship between free energy and reduction potential, emphasizing thermodynamic favorability. The tutorial also discusses non-standard conditions and the use of Faraday's law in stoichiometry, providing a comprehensive understanding of electrochemical processes.

What is the role of a voltmeter in an electrochemical cell?

• To measure the temperature of the cell

• To measure the concentration of ions

• To measure the cell potential

• To measure the pressure inside the cell

How do you determine the overall cell potential from half-reactions?

• By subtracting the oxidation potential from the reduction potential

• By adding the standard reduction potentials of the half-reactions

• By multiplying the standard reduction potentials of the half-reactions

• By dividing the oxidation potential by the reduction potential

What does a positive cell potential indicate about a reaction?

• The reaction is at equilibrium

• The reaction is thermodynamically favored

• The reaction is thermodynamically disfavored

• The reaction is non-spontaneous

What is the relationship between Gibbs free energy and cell potential?

• A negative Gibbs free energy indicates a favored reaction

• Gibbs free energy is always positive for electrochemical cells

• A positive Gibbs free energy indicates a favored reaction

• Gibbs free energy is unrelated to cell potential

What happens to the cell potential when Q is greater than 1?

• The cell potential becomes zero

• The cell potential increases

• The cell potential remains the same

• The cell potential decreases

In the context of electrochemical cells, what does the variable 'n' represent?

• The number of moles of reactants

• The number of ions in solution

• The number of moles of products

• The number of electrons transferred

What is the effect of non-standard conditions on cell potential?

• They always decrease cell potential

• They always increase cell potential

• They have no effect on cell potential

• They can either increase or decrease cell potential

What is Faraday's constant used for in electrochemical calculations?

• To determine the pressure inside the cell

• To convert between moles of electrons and coulombs

• To calculate the temperature of the cell

• To measure the concentration of ions

How many grams of gold are plated by a 25-minute flow of 5.5 amp current?

• 5.6 grams

• 10.2 grams

• 7.8 grams

• 3.4 grams

What is the significance of stoichiometry in electrochemical cells?

• It measures the concentration of ions

• It is used to calculate the pressure inside the cell

• It ensures that units cancel out correctly in calculations

• It helps in determining the temperature of the cell