electrochemistry Flashcards
(21 cards)
What is electrochemistry?
The branch of chemistry that deals with the relationship between electricity and chemical reactions.
True or False: Electrochemical cells convert chemical energy into electrical energy.
True
What is an electrolytic cell?
A type of electrochemical cell that uses an external voltage source to drive a non-spontaneous chemical reaction.
Fill in the blank: The process in which a chemical species gains electrons is called _____ .
reduction
What is oxidation in electrochemistry?
The process in which a chemical species loses electrons.
What is a galvanic cell?
An electrochemical cell that generates electrical energy from spontaneous chemical reactions.
True or False: In a galvanic cell, the anode is the site of oxidation.
True
What are cathodes and anodes?
The cathode is the electrode where reduction occurs, and the anode is the electrode where oxidation occurs.
What is Faraday’s law of electrolysis?
The amount of substance transformed at an electrode during electrolysis is proportional to the quantity of electric charge passed.
What is a salt bridge?
A device used in electrochemical cells to maintain electrical neutrality by allowing ions to flow between two half-cells.
True or False: The electrode potential is independent of the concentration of the reactants and products.
False
What is a redox reaction?
A chemical reaction in which oxidation and reduction occur simultaneously.
Fill in the blank: The _____ is a measure of how much a substance can be reduced.
reduction potential
What is the significance of the electrochemical series?
It ranks substances based on their standard electrode potentials, helping predict the direction of redox reactions.
What kind of reaction occurs at the anode of a galvanic cell?
Oxidation reaction
What is the purpose of a potentiometer in electrochemistry?
To measure the voltage of an electrochemical cell.
Fill in the blank: The term _____ refers to a solution that conducts electricity due to the presence of ions.
electrolyte
What is the relationship between Gibbs free energy and cell potential?
The change in Gibbs free energy is equal to the negative product of the cell potential and the number of moles of electrons transferred.
True or False: The voltage of a galvanic cell is constant throughout the reaction.
False
What is the role of a catalyst in an electrochemical reaction?
To increase the rate of the reaction without being consumed.
What does the term ‘electrolysis’ refer to?
The process of using electricity to drive a non-spontaneous chemical reaction.
