Oxidation-Reduction reactions +Electrochemistry Flashcards
What is a REDOX reaction
An ‘Oxidation-Reduction’ reaction: one in which one or more electrons are transferred
What is an oxidation reaction
loss of electrons (e-)
What is a reduction reaction
gain of electrons (e-)
Mnemonic for REDOX reaction states
OILRIG: oxidation is losing, reduction is gaining
What is the oxidizing agent
a substance which gains electrons and is therefore reduced
What is the reducing agent
a substance which loses electrons and is therefore oxidized
What is specified with the oxidizing or reducing agents
the whole compound
Process of balancing half-reactions
1) balance O >>>> Using H2O 2) Balance H >>>> Using H+ 3) Balance charges >>>> using e-
What is electrochemistry
the study of the interchange of chemical and electrical energy
What is a galvanic cell
(Electrochemical battery) is a device powered by a redox reaction where the oxidizing and reducing agents are separated so that electrons must travel through a wire
What is a salt bridge
a bridge made out something soaked in calcium chloride that maintains electronegativity
What is an Anode
electrode where oxidation occurs
What is a Cathode
electrode where reduction occurs
what is a spontaneous cell
working cell
what is a nonspontaneous cell
non-working cell
What metal on the list is oxidized (voltmeter list)
the highest metal
What do metals being oxidize do
Metals being oxidized lose mass
What do metals being reduced do
Metals being reduced gain mass
Solutions with a metal being oxidized…
increase in concentration
Solutions with a metal being reduced…
decrease in concentration
Remember:
Galvanic cells are constructed using the following reactions. For each question:
Identify and write the half reactions
Sketch a diagram and indicate which half reaction is the anode and cathode
Show the flow of electrons through the cell
Describe which electrode will disintegrate and which will build up over time.
ADD A ACIDIC SOLUTION
SHOW THE METALS
SHOW THE IONS
SHOW THE VOLTMETER, WIRE AND THE SALT BRIDGE
SHOW THE CATHODE AND ANODE
