Basics
This branch of chemistry deals with the interconversion of chemical energy and electrical energy.
What is electrochemistry?
This type of electrochemical cell converts chemical energy directly into electrical energy.
What is a galvanic (voltaic) cell?
The standard EMF of a cell is calculated using this difference between electrode potentials.
What is Ecell∘=Ecathode∘−Eanode∘?
This type of electrode has a stable and well-defined potential and is used for comparison.
What is a reference electrode?
This is the gradual destruction of a metal due to chemical or electrochemical reactions with its environment.
What is corrosion?
The loss of electrons in a chemical reaction is called this process.
What is oxidation?
In any electrochemical cell, this electrode is the site of oxidation.
What is the anode?
If the standard EMF of a cell is positive, this conclusion can be made about the cell reaction.
What is the reaction is spontaneous?
This electrode is assigned a standard potential value of 0.00 V.
What is the standard hydrogen electrode (SHE)?
In the rusting of iron, this electrochemical reaction occurs at the anodic region.
What is Fe → Fe2++ 2e−?
A reaction in which oxidation and reduction occur simultaneously is called this type of reaction.
What is a redox reaction?
In a Daniell cell, this metal electrode acts as the cathode.
What is copper?
Between zinc and copper electrodes, the metal with the more negative standard reduction potential undergoes this process.
What is oxidation?
This condition must be maintained for hydrogen gas in the standard hydrogen electrode.
What is hydrogen gas at a condition of 1 atm pressure?
When two dissimilar metals are electrically connected in an electrolyte, this type of corrosion occurs.
What is galvanic corrosion?
The driving force for electron flow in an electrochemical cell arises from this difference.
What is the difference in electrode potentials?
This device allows ion migration between half-cells while maintaining electrical neutrality.
What is a salt bridge?
A cell composed of Zn²⁺/Zn and Cu²⁺/Cu half-cells has a standard EMF of 1.10 V. This value arises mainly due to the difference in these properties.
What is the standard reduction potentials of the electrodes?
This reference electrode is commonly used in laboratories because it is easier to handle than the SHE.
What is the saturated calomel electrode (SCE)?
This corrosion prevention method works by converting the structure into a cathode using a more active metal.
What is cathodic protection?
Even though oxidation occurs at the anode in both galvanic and electrolytic cells, this property of the anode differs between the two.
What is the sign of the anode (negative in galvanic, positive in electrolytic cells)?
This electrochemical cell requires an external power source because its cell potential is negative.
What is an electrolytic cell?
If the roles of anode and cathode are reversed in a galvanic cell, this change occurs in the EMF value.
What is the EMF becomes negative?
The potential of the saturated calomel electrode at 25°C is approximately this value.
What is +0.241 V (approximately +0.24 V)?
Connecting magnesium to an underground steel pipeline prevents corrosion because magnesium undergoes this process preferentially.
What is sacrificial anodic protection?