Electrochemical Cells Overview

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is an electrochemical cell?

A device that converts chemical energy into electrical energy.

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

Daniell cell (correct)

Fuel cell

Li-ion battery

Lead-acid battery

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

False

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

1.1 V Signup and view all the answers

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

spontaneously Signup and view all the answers

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

Kohlrausch's law Signup and view all the answers

What is the significance of studying electrochemistry?

It helps create eco-friendly technologies and understand processes like corrosion and energy conversion. Signup and view all the answers

What is an electrochemical cell?

A device that converts chemical energy into electrical energy. Signup and view all the answers

Which of the following statements about galvanic cells is true?

They function spontaneously. Signup and view all the answers

What is the Nernst equation used for?

Calculating the emf of a galvanic cell. Signup and view all the answers

What does the standard potential of a cell refer to?

The electrical potential of the cell under standard conditions. Signup and view all the answers

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

They are related through the Gibbs free energy equation and thermodynamic principles. Signup and view all the answers

Define resistivity.

Resistivity is a measure of how strongly a material opposes the flow of electric current. Signup and view all the answers

What is conductivity?

The ability of a material to conduct electric current. Signup and view all the answers

What is molar conductivity?

It is the conductivity of a solution divided by its concentration. Signup and view all the answers

Which reaction is an example of a galvanic cell?

Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s) Signup and view all the answers

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

True Signup and view all the answers

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

The reaction stops and no current flows through the cell. Signup and view all the answers

What does the study of electrochemistry encompass?

The production of electricity from spontaneous chemical reactions and the use of electrical energy to cause non-spontaneous reactions. Signup and view all the answers

Study Notes

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.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

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.