Electrochem QQ Trade Flashcards
What is the definition for loss of electron(s) by a species
Oxidation
What is definition for gain of electron by a species
Reduction
What is the species being reduced called?
Oxidizing agent
What is the species being oxidized?
Reducing agent
What is the name of the reaction with both oxidation and reduction occurring together?
Redox reaction
A spontaneous reaction occurs in which cell?
Galvanic/Voltaic cells
In a galvanic cell which electrode is positive?
Cathode
Which electrode does oxidation occurs?
Anode
Which direction does the electron flow in the external circuit in a cell?
From anode to cathode
Which direction does the ions flow through the salt bridge?
Anions to anode & Cations to cathode
Which electrode gains mass?
Cathode
The addition method for finding the E of the cell is?
Ered + Eox (flipped)
The E value for a spontaneous reaction must be __________?
Positive
The subtraction method for finding the E of a cell is ?
Ered-Eox (from the chart)
The charge or valency of an atom is called ?
Oxidation number
Give two ways to balance redox reactions?
Oxidation numbers & half reaction methods
Group 1 and 2 ALWAYS have oxidation numbers ____ and ____?
+1 & +2
What is the charge of hydrogen most of the times?
+1
To balance charges you add _______
Electrons
To balance Hydrogens you add_____________
H+
To balance Oxygens you add_____________
H2O
What is used to represent the salt bridge in the Daniel cell?
Two lines in the center
What is the Shorthand notation of a galvanic cell called?
Daniel cell
In a Daniel cell which species goes on the right?
Reduced species
When two metal in their metal ions are in a cell, which one will be reduced?
The higher E value
The passage of current through a cell to cause electrical energy to be converted to chemical energy is called________________
Electrolysis
In an electrolytic cell, the cations move to the ___________ and the anions move to the ________
Cathode, anode
In an electrolytic cell, __________occurs at the cathode and __________ occurs at anode.
Reduction, oxidation
For an aqueous solution what two reactions are competing at the cathode?
Reduction of the metal ion and reduction of water
The reaction in an electrolytic cell is _______________ and the E value must always be __________.
Non-spontaneous, negative
What is the symbol and unit of quantity of electricity passing through the cell
Q, Coloumbs
Q= ____ x _____ and the units are _____ and _____
Q=IT and the units are amperes & seconds
One Faraday is equivalent to ____________ coloumbs and liberates only ________ mole of electron.
96500, one
