Redox Reactions and Electrochemical Cells

This video tutorial covers electrochemistry, focusing on voltaic cells, balancing redox reactions, calculating cell potential and Gibbs free energy, and understanding equilibrium constants. It explains the mechanics of voltaic cells, including the roles of anodes and cathodes, and how to calculate cell potential under standard and non-standard conditions. The video also addresses stoichiometry problems related to electrochemistry and provides guidance on balancing redox reactions under acidic and basic conditions. Finally, it discusses identifying reactions occurring at the anode and cathode in electrochemical cells.

What is the main difference between a voltaic cell and an electrolytic cell?

• Electrolytic cells have a positive cell potential.

• Voltaic cells have a positive cell potential.

• Electrolytic cells generate their own energy.

• Voltaic cells require an external energy source.

In an electrochemical cell, where does oxidation occur?

• At the cathode

• In the salt bridge

• At the anode

• In the solution

Which of the following is true about the role of a salt bridge in an electrochemical cell?

• It increases the cell potential.

• It maintains charge balance.

• It generates electrons.

• It acts as a reducing agent.

How is the equilibrium constant K related to the cell potential?

• K is unaffected by the cell potential.

• K is small when the cell potential is positive.

• K is large when the cell potential is positive.

• K is large when the cell potential is negative.

What is the purpose of using Faraday's constant in stoichiometry problems related to electrochemistry?

• To calculate the cell potential

• To convert charge to moles of electrons

• To determine the equilibrium constant

• To convert moles of electrons to grams

What is the oxidation state of chromium when it is attached to three chloride ions?

• Plus three

• Zero

• Plus one

• Plus two

Which metal is identified as the strongest reducing agent based on its cell potential?

• Aluminum

• Copper

• Iron

• Silver

In a redox reaction, which type of agent tends to gain electrons?

• Catalyst

• Neutral agent

• Oxidizing agent

• Reducing agent

When balancing redox reactions under acidic conditions, which ions are typically added to balance hydrogen atoms?

• Sulfate ions

• Hydroxide ions

• Chloride ions

• Hydrogen ions

In an electrochemical cell, where does oxidation occur?

• Cathode

• Anode

• Salt bridge

• Electrolyte