Electrochemical Cells Overview

What is an electrochemical cell?

Which type of cell can function as both a galvanic cell and an electrolytic cell?

The Nernst equation is used for calculating the emf of an electrolytic cell.

What is the standard potential of the Daniell cell under standard conditions?

Electrical energy can be used to carry out chemical reactions that do not proceed __________.

What laws relate to the conductivity and molar conductivity of solutions?

What is the significance of studying electrochemistry?

What is an electrochemical cell?

Which of the following statements about galvanic cells is true?

What is the Nernst equation used for?

What does the standard potential of a cell refer to?

What is the relation between standard potential of the cell, Gibbs energy, and equilibrium constant?

What is conductivity?

What is molar conductivity?

Which reaction is an example of a galvanic cell?

Electrolytic cells are used to carry out non-spontaneous reactions.

What happens when the voltage reaches 1.1 V in a galvanic cell?

What does the study of electrochemistry encompass?

Electrochemical Cells

A galvanic or voltaic cell converts chemical energy into electrical energy.
The Daniell cell is an example of a galvanic cell.
The Daniell cell uses a redox reaction to produce electricity: Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s)
The standard cell potential E° of the Daniell cell is 1.1 V when concentrations of Zn2+ and Cu2+ ions are 1 mol dm–3.
When an external opposite potential is applied to the galvanic cell and increased, the reaction continues until the opposing voltage reaches the cell potential. At this point, the reaction stops.
Any further increase in the external potential causes the reaction to proceed in the opposite direction, and the cell becomes an electrolytic cell.
An electrolytic cell uses electrical energy to drive non-spontaneous chemical reactions.

Electrochemical Cells

Electrochemical cells convert chemical energy to electrical energy (galvanic) or use electrical energy to cause chemical reactions (electrolytic).
A galvanic cell is powered by a spontaneous redox reaction, which generates an electrical potential.
Daniell cell uses the redox reaction between zinc and copper ions to produce an electrical potential of 1.1V with 1 mol dm-3 of Zn2+ and Cu2+ ions.
Increasing the external voltage applied to a galvanic cell opposes the spontaneous reaction.
At 1.1V the reaction in a Daniell cell stops completely.
Increasing the external voltage above 1.1V reverses the reaction, turning the galvanic cell into an electrolytic cell.
Electrolytic cells use electrical energy to drive non-spontaneous chemical reactions.

Explore the principles of electrochemical cells, including galvanic and electrolytic cells. This quiz will cover the Daniell cell, redox reactions, and the concepts of cell potential and spontaneous reactions. Test your understanding of how chemical energy is converted to electrical energy in various cell types.